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CHEMISTRY (632 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 14)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 28)
ACS Catalysis     Hybrid Journal   (Followers: 46)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 22)
ACS Combinatorial Science     Hybrid Journal   (Followers: 23)
ACS Macro Letters     Hybrid Journal   (Followers: 27)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 42)
ACS Nano     Hybrid Journal   (Followers: 308)
ACS Photonics     Hybrid Journal   (Followers: 14)
ACS Symposium Series     Full-text available via subscription  
ACS Synthetic Biology     Hybrid Journal   (Followers: 25)
Acta Chemica Iasi     Open Access   (Followers: 5)
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 8)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 8)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Adsorption Science & Technology     Open Access   (Followers: 6)
Advanced Functional Materials     Hybrid Journal   (Followers: 60)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 75)
Advances in Chemical Science     Open Access   (Followers: 19)
Advances in Chemistry     Open Access   (Followers: 24)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19)
Advances in Drug Research     Full-text available via subscription   (Followers: 25)
Advances in Environmental Chemistry     Open Access   (Followers: 7)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 12)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 27)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Polymer Science     Hybrid Journal   (Followers: 45)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 3)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 8)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 3)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 68)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 22)
American Journal of Chemistry     Open Access   (Followers: 32)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Hybrid Journal   (Followers: 16)
Anadolu University Journal of Science and Technology A : Applied Sciences and Engineering     Open Access  
Analyst     Full-text available via subscription   (Followers: 37)
Angewandte Chemie     Hybrid Journal   (Followers: 181)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 259)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 4)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 9)
Applied Spectroscopy     Full-text available via subscription   (Followers: 25)
Applied Surface Science     Hybrid Journal   (Followers: 34)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 3)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 3)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 378)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 11)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 23)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 139)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 90)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 11)
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
Carbohydrate Research     Hybrid Journal   (Followers: 25)
Carbon     Hybrid Journal   (Followers: 71)
Catalysis for Sustainable Energy     Open Access   (Followers: 8)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 12)
Cellulose     Hybrid Journal   (Followers: 10)
Cereal Chemistry     Full-text available via subscription   (Followers: 5)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 21)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 75)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 27)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 205)
Chemical Science     Open Access   (Followers: 28)
Chemical Technology     Open Access   (Followers: 34)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 57)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 23)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 33)
Chemistry & Industry     Hybrid Journal   (Followers: 8)
Chemistry - A European Journal     Hybrid Journal   (Followers: 168)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
Chemistry and Materials Research     Open Access   (Followers: 21)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Open Access   (Followers: 3)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Hybrid Journal   (Followers: 268)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 11)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 6)
Cogent Chemistry     Open Access   (Followers: 2)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 22)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Communications Chemistry     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 7)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 4)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 7)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 8)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal   (Followers: 1)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 14)
Current Research in Chemistry     Open Access   (Followers: 9)
Current Science     Open Access   (Followers: 73)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 2)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
Detection     Open Access   (Followers: 4)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)

        1 2 3 4 | Last

Journal Cover
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2302-7274
Published by Universitas Udayana Homepage  [72 journals]

    • Authors: I Made Wisnu Adhi Putra
      Pages: 51 - 57
      Abstract: ABSTRAK: Biodisel adalah metil ester asam lemak yang dihasilkan melalui reaksi transesterifikasi antara minyak dan lemak dengan alkohol dalam kehadiran katalis. Dalam penelitian ini, pembuatan biodisel dari minyak jelantah dan metanol melalui reaksi transesterifikasi telah berhasil dilakukan menggunakan katalis CaO/zeolit alam. Metode impregnasi basah dipilih untuk menyintesis katalis dengan cara mengaduk campuran zeolit alam dengan CaO dalam sistem refluks pada 90 oC selama 3 jam. Jumlah CaO terimpregnasi pada zeolit alam adalah 5%wt, 10%wt, dan 15%wt. Karakterisasi katalis menggunakan FTIR, XRD, dan N2 sorption analyzer menunjukkan bahwa katalis dengan 15%wt CaO yang terimpregnasi merupakan katalis yang paling baik. Reaksi transesterifikasi dilakukan dalam variasi rasio molar minyak:metanol, waktu reaksi, dan jumlah katalis. Analisis menggunakan GC-MS menunjukkan bahwa kandungan biodisel didominasi oleh metil palmitat, dan metil oleat. Konversi biodisel tertinggi ditemukan pada kondisi rasio minyak:metanol yaitu 1:15, waktu reaksi 5 jam, dan katalis 5%wt.     ABSTRACT: Biodiesel is fatty acid methyl esters (FAME) produced by transesterification reaction of oils and fats with an alcohol in the presence of a catalyst. In this work, production of biodiesel from waste cooking oil and methanol by transesterification reaction has been successfully conducted using CaO/natural zeolite catalysts. Wet impregnation method was choosen to synthesize the catalyst by stirring the mixture of natural zeolites and CaO in reflux apparatus at 90 oC for 3 hours. The amount of CaO impregnated into natural zeolite were 5%wt, 10%wt, and 15%wt. The catalysts characterization using FTIR, XRD, and N2 sorption analyzer showed that catalyst with 15%wt CaO impregnated into zeolites was the greatest one. Transesterification reaction was carried out in various oil to methanol molar ratio, reaction time, and amount of catalyst. GC-MS analysis confirmed that the biodiesel contents were dominated by methyl palmitate and methyl oleate. The highest biodiesel conversion was found under condition of 1:15 oil to methanol molar ratio, 5 hours of reaction time, and 5%wt of catalyst.    
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: M. Mahfudz Fauzi S, Sutarno Sutarno, Suyanta Suyanta
      Pages: 58 - 66
      Abstract: ABSTRAK: Telah disintesis MCM-41 dengan metode sonikimia dengan berbahan dasar natrium silikat sebagai sumber silika dan setiltrimetilamonium bromida sebagai surfaktan. Campuran homogen dari semua reagen disonikasi dengan variasi waktu selama 60 menit, 90 menit, 120 menit, dan 150 menit. Padatan yang terbentuk selama sonikasi, disaring dan dikeringkan selama 6 jam pada 110 ºC dan dikalsinasi pada 550 ºC selama 6 jam juga. Hasil karakterisasi dengan menggunakan XRD dan spektroskopi FTIR menunjukkan kondisi optimum MCM-41 diperoleh dengan sonikasi selama 90 menit.     ABSTRACT: MCM-41 was synthesized by using sonichemistry method with sodium silicate as silica source and surfactants cethyltrimethylammonium bromide (CTMABr). The homogeneously mixtures were sonicated for 60 minutes, 90 minutes, 120 minutes, and 150 minutes.  The solid materials during sonication were dried for 6 hous at 110 ºC and calcined at 550ºC for 6 hours too. By using XRD and FTIR, the result showed that the optimum product of MCM-41 was obtained at the time of sonication for 90 minutes.  
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: Emmy Sahara, Ni Putu Widyana Kartini, James Sibarani
      Pages: 67 - 74
      Abstract: ABSTRAK : Penelitian ini bertujuan untuk mengetahui kapasitas adsorpsi dari arang batang tanaman gumitir (Tagetes erecta) yang diaktivasi asam fosfat (H3PO4) 15% terhadap ion logam Pb2+ dan Cu2+. Arang yang belum dan sudah diaktivasi dikarakterisasi luas permukaan spesifiknya dengan metode adsorpsi terhadap metilen biru dan keasaman permukaannya dengan titrasi asam-basa. Optimasi kondisi penyerapan dilakukan dengan menentukan waktu setimbang, isoterm adsorpsi dan pengaruh pH terhadap kapasitas adsorpsi pada kedua logam. Hasil penelitian menunjukkan bahwa arang teraktivasi memiliki karakteristik yang lebih baik dari pada arang tanpa aktivasi. Arang teraktivasi memiliki luas permukaan dan jumlah situs aktif berturut-turut sebesar 36,4505 m2/g dan 37,1292x1020 molekul/gram sedangkan arang tanpa aktivasi memiliki luas dan jumlah situs aktif berturut-turut sebesar 28,2206 m2/g dan 29,9920x1020 molekul/gram. Waktu kontak terbaik untuk proses adsorpsi Pb2+ dan Cu2+ adalah 60 menit dengan nilai isoterm adsorpsi sebesar 150 mg/L. Kapasitas adsorpsi Pb2+ sebesar 5,0592 mg/g terjadi pada pH 3 sedangkan kapasitas adsorpsi Cu2+ sebesar 5,7867 mg/g terjadi pada pH 4. Proses adsorpsi arang batang gumitir teraktivasi H3PO4 dalam penelitian ini tergolong kemisorpsi dengan pola isoterm adsorpsi tipe Langmuir dengan nilai koefisien determinasi Pb2+ sebesar 0,9935 dan Cu2+ sebesar 0,9944.   ABSTRACT : The aim of this study is to find out the adsorption capacity of the phosphoric acid (H3PO4)-activated marigold (Tagetes erecta) stem carbon in reducing Pb2+ and Cu2+ from their solutions. The activated carbon was characterized by determining its specific surface area using methylene blue adsorption method and the surface acidity by acid-base titration technique. Optimization of the absorption conditions was carried out by determining the equilibrium time, isotherm adsorption and the effect of pH on adsorption capacity on both metal ions. The results showed that activated carbon has better characteristics than carbon without activation. The activated carbon have a surface area and active sites of 36,4505 m2/g and 37,1292x1020 molecules/gram, respectively, while for carbon without activation of 28,2206 m2/g and 29,9920x1020 molecules/gram, respectively. The equilibrium time adsorption of  Pb2+ and Cu2+ was 60 min and the adsorption isotherm value was of 150 mg/L. The adsorption capacity of  Pb2+ at pH 3 was 5.0592 mg/g  while the adsorption capacity of Cu2+ was 5.7867 mg/g at pH 4. The adsorption process of the H3PO4-activated carbon in this study was classified as chemisorption with adsorption pattern of Langmuir with determination coefficient for Pb2+ and Cu2+ are of 0.9935 and 0.9944, respectively.  
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: Khairul Mahfuz, I Made Agus Gelgel Wirasuta, Ni Made Suaniti
      Pages: 75 - 85
      Abstract: ABSTRAK: Penelitian ini bertujuan untuk mengetahui perubahan pola spektrum Raman Efedrin Hidroklorida, Dekstrometorfan dan Tramadol Hidroklorida pada tablet obat (Decolsin®,Tramifen®) dan sampel simulasi. Tablet Obat serta sampel simulasi Efedrin Hidroklorida, Dekstrometorfan dan Tramdol Hidroklorida dengan konsentrasi 80%, 60%, 40% dan 20% dalam serbuk Amprotab diukur dengan spektroskopi Raman 1064 nm pada bilangan gelombang 200-2000 cm-1. Hasil yang didapat dianalisis dengan cross correlation function dan dilihat nilai koefisien korelasi (r). Pada masing-masing tablet Obat hanya Parasetamol yang dapat diidentifikasi karena nilai koefisien korelasi r > 0,95. Berdasarkan hasil sampel simulasi diketahui bahwa konsentrasi Efedrin Hidroklorida, Dekstrometorfan dan Tramadol Hidroklorida pada suatu campuran berpengaruh terhadap pola spektrum Raman yang dihasilkan. Pola puncak spektrum Raman untuk identifikasi Efedrin Hidroklorida yaitu pada bilangan gelombang 1305 cm-1 (C-N), 1380 cm-1 (C-CH3), 1662 cm-1 (C=C), 1600 cm-1 (C-OH), dan 315 cm-1 (C-C alifatik); Dekstrometorfan yaitu puncak pada bilangan gelombang 1040 cm-1 (cincin Aromatis I), 1495 cm-1 (cincin Aromatis II), 768 cm-1 (C-Cl), 1580 cm-1 (cincin Hetero), 1667 cm-1 (C=C ) dan 855 cm-1 (C-O-C); Tramadol Hidroklorida yaitu puncak pada bilangan gelombang 1006 cm-1 (cincin aromatis I), 1467 cm-1 (cincin aromatis II), 1552 cm-1 (C-OH), 1635 cm-1 (C=C), 285 cm-1 (C-C Alifatik), 1345 cm-1 (C-N) dan 855 cm-1 (C-O-C).   ABSTRACT: The aims of this study were determined to change in the pattern of Raman spectrum of Ephedrine Hydrocloride, Dextrometorfan and Tramadol Hydrocloride on tablet (Decolsin®,Tramifen®) and simulation samples. Tablets and simulation samples of this active compound made in Amprotab with concentration 80%, 60%, 40% and 20% measured by 1064 nm Raman spectroscopy in wave numbers 200-2000 cm-1. The results can be analyzed by cross-correlation function and showed the value of the correlation coefficient r. On tablet only Paracetamol can be identified because it has coefficient correlation r > 0,95. Based on the results of the simulation sample is known that the concentration of active compound in a mixture affect the pattern of the Raman spectra. Peak pattern to identification Ephedrine Hydrocloride is at wave number 1305 cm-1 (C-N), 1380 cm-1 (C-CH3), 1662 cm-1 (C=C), 1600 cm-1 (C-OH), dan 315 cm-1 (C-C alifatik); Dextrometorfan is at wave number 1040 cm-1 (Aromatic Ring I), 1495 cm-1 (Aromatic Ring II), 768 cm-1 (C-Cl), 1580 cm-1 (Hetero Ring), 1667 cm-1 (C=C ) dan 855 cm-1 (C-O-C); Tramadol Hydrocloride is at wave number 1006 cm-1 (Aromatic Ring I), 1467 cm-1 (Aromatic Ring II), 1552 cm-1 (C-OH), 1635 cm-1 (C=C), 285 cm-1 (C-C Alifatik), 1345 cm-1 (C-N) and 855 cm-1 (C-O-C).    
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: I Made Siaka
      Pages: 86 - 93
      Abstract: ABSTRAK: Karakteristik logam berat pada organisme dan sistem ekologis tidak dapat diterangkan hanya dengan mengetahui kandungan logam total dalam perairan, melainkan dengan penentuan bentuk geokimia atau spesies logam tersebut. Penelitian ini bertujuan untuk menentukan spesiasi dan bioavailabilitas logam berat Pb dan Cu pada sedimen di Kawasan Pantai Celukan Bawang Buleleng, Bali. Analisis logam total, spesiasi dan bioavailabilitas ditentukan dengan menerapkan metode digesti dan ekstraksi bertahap. Kandungan logam Pb dan Cu total dalam sedimen Pantai Celukan Bawang berturut-turut 17,2865-39,4533 mg/kg dan 12,9665-56,1346 mg/kg. Spesies logam Pb paling banyak berada sebagai fraksi resistant (29,75-67,10%), diikuti oleh fraksi tereduksi asam (22,45-31,67%), fraksi EFLE (easily, freely, leachable, exchangeable) dengan kisaran dari tidak terdeteksi (ND) hingga 29,33%, dan yang terendah berasosiasi dengan fraksi teroksidasi organik (ND-14,18%). Spesies logam Cu juga didominasi oleh fraksi resistant (80,52-90,22%), fraksi teroksidasi organik (4,81-17,20%) berada pada urutan ke dua, diikuti oleh fraksi EFLE (0,88-5,83%), dan terrendah adalah fraksi tereduksi asam (ND-1,14%). Bioavailabilitas logam Pb yang sertamerta bioavailabel berkisar ND-29,33% dan yang berpotensi bioavailabel adalah 33,35-42,78%, sedangkan logam Pb yang  nonbioavailabel adalah 29,75-67,10%. Berbeda dengan Pb, logam Cu didominasi oleh bentuk non bioavailabel yaitu berkisar 80,52-90,22%, diikuti oleh Cu yang  berpotensi bioavailabel, yaitu 5,95-16,61%, dan terkecil adalah Cu yang bersifat sertamerta bioavailabel (0,88-5,83%).   ABSTRACT: The characteristics of heavy metals in organisms as well as on ecological systems cannot be explained by the only knowing total metal contents in sediments but also by determining the geochemical forms or the metal species in the sediments. This study aimed to determine the speciation and bioavailability of heavy metals, Pb and Cu in sediments of Celukan Bawang Beach area of Singaraja, Bali. The total metals, speciation and bioavailability analysis were determined by applying a digestion and sequential extraction methods. The total metal contents of Pb and Cu in the sediments were 17.2865-39.4533 mg/kg and 12.9665-56.1346 mg/kg, respectively. The species distribution of the metals in the sediments was as follows: species of Pb was dominated by the form of resistant fraction (29.75-61.10%), followed by reducible acid fraction (22.45-36.25%), EFLE fraction (easily, freely, leachable, exchangeable) ranging from undetectable (ND) to 29.33%, and the lowest percentage fraction was associated with the organic oxidizable phase (ND-14.18%). The resistant fraction was also the most dominant for Cu (80.52-90.22%), but the oxidizable fraction (4.81-17.20%) was found in the second level, followed by the EFLE fraction (0.88-5.83%), and the lowest was associated with reducible fraction (ND-1.14%). The readily bioavailable Pb ranged from 3.62 to 29.33% and potentially bioavailable Pb was 33.35-42.78%, nonbioavailable Pb was 29.75-61.10%. Different from Pb, Cu metal was dominant as non bioavailable metal (80.52-90.22%), but 0.88-5.83% of the Cu was readily bioavailable and 5.95-16.61% was potentially bioavailable.  
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: I Ketut Gede Dharma Dewantara, I Wayan Gede Gunawan, I Nengah Wirajana
      Pages: 94 - 101
      Abstract: ABSTRAK: Penelitian ini bertujuan untuk mengetahui potensi ekstrak etanol daun gedi (Abelmoschusmanihot L.) sebagai antioksidan dan terhadap penurunan kadar glukosa darah tikus putih galur wistar yang diinduksi aloksan. Uji aktivitas antioksidan dari ekstrak etanol daun gedi menggunakan metode DPPH dengan konsentrasi sampel yaitu 2, 4, 6, 8, dan 10 ppm serta menggunakan asam askorbat sebagai senyawa standar. Uji penurunan glukosa darah pada tikus wistar yang diinduksi aloksan menggunakan 25 ekor tikus wistar yang dibagi menjadi 5 kelompok yaitu dua kelompok kontrol dan tiga kelompok perlakuan dengan beragam dosis ekstrak daun gedi. Dosis yang digunakan pada masing-masing kelompok perlakuan adalah 5 mg/kgBB (P2), 10 mg/kgBB (P3), dan 15 mg/kgBB (P4). Kondisi hiperglikemia pada semua kelompok kontrol dan perlakuan diinduksi dengan aloksan dosis 125 mg/kgBB. Hasil penelitian uji antioksidan menunjukkan bahwa ekstrak etanol daun gedi memiliki nilai IC50 sebesar 31,29 ppm. Hasil uji penurunan kadar glukosa darah pada kelompok kontrol positif (P1) sebesar 138,8 mg/dL, kelompok perlakuan P2 sebesar 72 mg/dL; P3 sebesar 97,4 mg/dL dan P4 sebesar 137,6 mg/dL. Perbedaan penurunan rerata kadar glukosa ini dianalisis dengan metode One Way ANOVA dan didapatkan hasil bahwa semua data dari kelompok memiliki perbedaan yang signifikan   ABSTRACT: The purposes of this research are to determine the potential of gedi leaves (Abelmoschus manihot L.) ethanol extract as antioxidant and on the reduction blood glucose level of wistar strain white rats induced by alloxan. The antioxidant activity test of ethanol extract of gedi leaves with concentration of 2, 4, 6, 8 and 10 ppm was conducted by using DPPH method with ascorbic acid as standard compound. The reduction test of alloxan-induced blood glucose in rats was conducted with 25 rats divided into 5 group which are two control groups and three treatment groups treated with different doses of gedi leaves ethanol extracts. The doses used on each the treatment groups were 5 mg/kgBW (P2), 10 mg/kgBW (P3), and 15 mg/kgBW (P4). The hyperglycemia condition of all  groups was induced by alloxan at dose of 125 mg/kgBW. The antioxidant activity test of gedi leaves ethanol extract showed that the  IC50 was 31.29 ppm. Moreover, the intake of gedi leaves ethanol extract decreased the blood glucose of positive control group, P2, P3 and P4 of 138.8 mg/dL,  72 mg/dL,  97.4 mg/dL,  and 137.6 mg/dL respectively. The difference of blood glucose reduction had been tested with One Way ANOVA method which showed the significant different between the groups.  
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: Ni Made Puspawati, I Wayan Suirta, Ni Luh Putu Mega Wahyuni, Ni Ketut Ratnayani
      Pages: 102 - 107
      Abstract: ABSTRAK:  Cendana (Santalum album L.) umumnya digunakan sebagai obat tradisional untuk mengobati inflamasi (bengkak). Penelitian ini bertujuan untuk menguji aktivitas antiinflamasi fraksi n-heksan ekstrak daun cendana (Santalum album L.) terhadap udema pada telapak kaki tikus putih jantan galur Wistar yang diinduksi karagenan dan mengidentifikasi senyawa aktifnya. Pada pengujian aktivitas antiinflamasi digunakan 5 kelompok tikus yaitu kelompok kontrol positif (na-diklofenak 5 mg/kg BB), kelompok kontrol negatif (CMC 1%) dan 3 kelompok perlakuan (dosis fraksi n-heksan 125 mg/kg BB, 250 mg/kg BB, dan 500 mg/kg BB). Hasil uji aktivitas antiinflamasi menunjukkan pada menit ke-360 fraksi n-heksana pada dosis 125 mg/kg BB dan 250 mg/kg BB mampu menghambat udema telapak kaki tikus berturut-turut sebesar 80,39% dan 82,35% lebih tinggi dari kontrol positif yaitu 66,66%. Sedangkan pada dosis yang lebih tinggi 500 mg/kg BB  aktivitasnya menurun dan lebih rendah dari kontrol positif yaitu sebesar 44,12%. Hasil uji One Way ANOVA menunjukkan bahwa pemberian dosis 125 mg/kg BB dan dosis 250 mg/kg BB tidak memiliki perbedaan bermakna dengan kelompok kontrol positif, sedangkan untuk dosis 500 mg/kg BB memiliki tidak memiliki perbedaan bermakna dengan kontrol negatif. Analisis GC-MS menunjukkan bahwa fraksi n-heksan daun cendana mengandung senyawa 2,2,4-trimetil-1,3-pentanadiol diisobutirat; metil palmitat; metil linoleat; metil oleat; di(2-etilheksil) terephtalat; dan asaron.   ABSTRACT: Sandalwood (Santalum album L.) is commonly used as a traditional medicine to treat inflammation. The aim of this research were to evaluate antiinflammatory activity of n-hexane fraction of cendana leaves extract and to characterise its active compounds. The anti-inflammatory activity test was conducted using 25 Wistar rats which were divided into five groups: group 1 treated with carrageenan (control negative), group 2 treated with standar drug (sodium diclofenac) whereas group 3,4, and 5 treated with different doses (125, 250, and 500 mg/kg/BW) of n-hexane fraction of santalum album leaves extract along with carrageenan respectively. The active constituent was charactersised using GC-MS (Gas Chromatography-Mass Spectrometer). The anti-inflammatory test demonstrated that the n-hexane fraction of santalum album leaves reduced carrageenan induced rats paw edema in a dose dependent manner. The  n-hexane fraction at dose of 125 and 250 mg/kg BW showed potent inhibition of inflammation after 6 hours which can inhibit inflammation by 80.39 and 82.35% respectively  as compared to positive control (66.66%). Further increase in dose i.e 500 mg/kg BW decreased the activity to 44.12%. Statistical analysis showed that antiinflammatory activity of n-hexane fraction at doses 125 mg and 250 mg/kgBW did not significantly different to control positif while at dose of 500 mg/kgBW did not significantly different to control negative. The active compounds were tentaviley identified as 2,2,4-trimethyl-1,3-pentandiol diisobutyrates, hexadecanoic acid, methyl ester; octadeca,9,12-dienoic acid, methyl ester, 9-octadecenoic acid, methyl ester, terepthalic acid, 2-ethylhexyl undecyl ester, and asarone.  
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: Ni Putu Widya Astuti, I Putu Darma Wijaya, I Ketut Tunas
      Pages: 108 - 112
      Abstract: ABSTRAK: Pengembangan ubi jalar ungu (Ipomea batatas L.)sebagai pangan fungsional banyak dilakukan di Indonesia. Sedangkan pemanfaatan daun ubi jalar ungu belum banyak digunakan dan hanya sebagai limbah hasil pertanian. Telah dilakukan penelitian tentang aktivitas antioksidan dari daun ubi jalar ungu. Daun ubi jalar ungu mempunyai metabolit sekunder yang berfungsi sebagai antioksidan. Salah satu manfaat dari senyawa antioksidan yaitu untuk meredam radikal bebas yang disebabkan oleh stres oksidatif. Stres oksidatif dapat ditimbulkan dari mengkonsumsi minuman beralkohol. Arak merupakan minuman beralkohol khas dari Bali dan digunakan dalam upacara keagamaan. Tujuan penelitian ini yaitu untuk mengetahui pengaruh pemberian ekstrak daun ubi jalar ungu dalam menurunkan kadar MDA pada tikus wistar yang mengkonsumsi arak. Penelitian menggunakan penelitian eksperimental dengan menggunakan rancangan Pre-test Post-tes kontrol Group Desain. Setiap kelompok diberika arak selama 14 hari dan dihari berikutya diberikan ekstrak etanol daun ubi jalar ungu dengan dosis 50 mg/kg BB (P1), 75 mg/kg BB (P2) dan 100 mg/kg BB (P3). Hasil penelitian menunjukkan adanya pengaruh pemberian ekstrak etanol daun ubi jalar ungu pada pemberian 50, 75 dan 100 mg/kg BB ekstrak dengan p < 0,05.   ABSTACT: The development of purple sweet potato (Ipomea batatas L.) as a functional food is mostly done in Indonesia. While the utilization of purple sweet potato leaves has not been widely used and only considered as agricultural waste. There has been several research on the antioxidant activity of purple sweet potato leaves. The purple sweet potato leaves have secondary metabolites function as antioxidants. One of the benefits of antioxidant compounds is to reduce free radicals caused by oxidative stress. Oxidative stress can be generated from consuming alcoholic beverages. Arak or palm wine is a typical alcoholic beverage from Bali and commonly used in religious ceremonies. The purpose of this study was to determine the effect of purple sweet potato extracts in reducing levels of MDA in wistar rats that consumed arak. Experimental study was applied in this research using the design of Pre-test Post-control Group Design tests. Each group was given arak for 14 days and the following day the purple sweet potato ethanol extract was given with doses of 50 mg / kg BW (P1), 75 mg / kg BW (P2) and 100 mg / kg BW (P3). The results showed that thre was an effect of ethanol extract of purple sweet potato leaves on the administration of 50, 75 and 100 mg/kg BW extract respectively with p <0,05.    
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: Ida Ayu Putu Sri Adnyasari, Ni Made Puspawati, I Made Sukadana
      Pages: 113 - 119
      Abstract: ABSTRAK: Penelitian ini bertujuan untuk menguji aktivitas antiinfamasi dari ekstrak etanol batang antawali (Tinospora sinensis) dan mengidentifikasi kandungan kimianya. Uji aktivitas antiinflamasi dilakukan secara in vivo dengan metode induksi karagenan, sedangkan identifikasi kandungan kimia secara kualiatif dengan uji fitokimia. Penelitian ini menggunakan 25 ekor tikus putih jantan galur Wistar yang dibagi menjadi 5 kelompok yaitu kontrol negatif (P0), kontrol positif (P1), dan kelompok ekstrak uji (P2, P3, dan P4) dengan dosis 125 mg/kg BB, 250 mg/kg BB, dan 500 mg/kg BB. Hasil uji aktivitas antiinflamasi menunjukkan bahwa semakin rendah dosis yang diberikan, maka akan menghasilkan persentase hambatan inflamasi yang semakin besar. Pemberian dosis 125 mg/kg BB mampu menghasilkan persentase hambatan tertinggi, diikuti dengan dosis 250 mg/kg BB, serta 500 mg/kg BB yaitu masing-masing sebesar 64,71%; 52,94%; dan 29,41% pada menit ke-360. Ekstrak etanol batang antawali memiliki nilai ED50 sebesar 51,521 mg/kg BB. Secara statistik dengan uji One Way ANOVA menunjukkan nilai p<0,05. Hasil uji fitokimia menunjukan bahwa ekstrak etanol batang Tinospora sinensis mengandung senyawa alkaloid, fenolik, dan steroid.   ABSTRACT: This study aimed to evaluate the antiinflammatory activity of ethanolic extract of antawali stem (Tinospora sinensis) and  to  identify its phytochemical constituents. In vivo antiinflammatory activity test was performed on Wistar rat oedem induced by carrageenan, while identification of chemical constituents was done with phytochemical screening. In this study, 25 male Wistar strains were divided into 5 groups : negative control (P0), positive control (P1), test extract group (P2, P3, and P4) with doses of 125 mg/kg BW, 250 mg/kg BW, and 500 mg/kg BW. Antiinflammatory activity test results showed that the lower the dose given, it will show a greater percentage of inflammatory inhibition. The dose of 125 mg/kg BW was able to produce the highest percentage of inhibition, followed by doses of 250 mg/kg BW, and 500 mg/kg BW at 64.71%; 52.94%; and 29.41% in the 360th minute. The extract of ethanol stem antawali active as antiinflamasi with ED50 that was equal to 51,521 mg/kg BB. Statistic One Way ANOVA test showed p value < 0,05. The result of phytochemical screening showed that stem ethanolic extract of Tinospora sinensis contains alkaloids, phenolic, and steroids.
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: I Made Siaka, Putu Dona Oka Putri, I Wayan Suarsa
      Pages: 120 - 129
      Abstract: ABSTRAK : Limbah batang gumitir mengandung selulosa cukup tinggi, sehingga dapat dimanfaatkan sebagai bahan dasar pembuatan arang. Arang yang dihasilkan tersebut dapat digunakan sebagai adsorben. Kualitas adsorben dapat ditingkatkan melalui  proses aktivasi. Penelitian ini bertujuan untuk mengetahui perbedaan karakteristik antara arang tanpa pemanasan dengan yang dipanaskan sebelum diaktivasi dengan NaOH dan menentukan gugus fungsi, situs aktif, serta mengetahui waktu kontak dan pH optimum dalam adsorpsi Pb(II) dan Cd(II). Metode metilen biru digunakan untuk analisis luas permukaan, spektroskopi FTIR dan AAS digunakan untuk analisis gugus fungsi dan konsentrasi logam berat. Arang tanpa pemanasan sebelum aktivasi (KA1) memiliki karakteristik (kadar air, zat mudah menguap, abu total, dan karbon terikat) terbaik dan memenuhi baku mutu sesuai dengan standar SNI 06-3730-1995. Arang aktif KA1 juga memiliki luas permukaan dan bilangan iodin paling tinggi yaitu 1816,16 m2/g dan 1227,21 mg/g. Hasil identifikasi FTIR menunjukkan bahwa arang aktif KA1 mengandung gugus fungsi OH, COOH, C=O, dan CH3 dengan jumlah situs aktifnya sebesar 17,14x1020 molekul/g. Waktu dan pH optimum adsorpsi terhadap logam berat adalah 120 menit pada pH 5 untuk Pb(II) dan 60 menit pada pH 7 untuk Cd(II).   Kata kunci :Gumitir, arang aktif, adsorben, logam berat   ABSTRACT : Marigold stem wastes contain high enough cellulose, so it can be utilized as the basic material of making active carbon. The carbon produced can be used as an adsorbent. The quality of the adsorbent can be improved through the activation process. The aim of this study was to determine the characteristic differences between carbon without heating and heated before being activated with NaOH, as well as, to determine functional group, active site, and the optimum of contact time and pH in adsorption of Pb and Cd. The methylene blue method was used for analysing surface area, spectroscopy of FTIR and AAS was used for analysing functional groups and heavy metal concentrations. The carbon without preheating of activation (KA1) had the best characteristics (including, moisture content, volatile matter, total ash, and carbon bonded) and meets the quality standard in accordance with SNI 06-3730-1995 standard. The active carbon of KA1 also had the highest surface area and iodine number of 1816,16 m2/g and 1227,21 mg/g, respectively. Spectra of FTIR indicated that the active carbon of KA1 contained functional groups of OH, COOH, C=O, and CH3 with the number of active sites of 17.14x1020 molecules/g. The optimum time and pH of adsorption to the heavy metals was 120 minutes at pH 5 for Pb(II) and 60 minutes at pH 7 for Cd(II).    
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)
           Linn.) TERHADAP BAKTERI Escherichia coli DAN Staphylococcus aureus

    • Authors: Wiwik Susanah Rita, I Wayan Suirta, Putu Prisanti Putri Utami
      Pages: 130 - 136
      Abstract: ABSTRAK:  Isolasi minyak atsiri dari rimpang jeringau (Acorus calamus Linn) dan uji aktivitas antibakteri terhadap bakteri Escherichia coli (E. coli) dan Staphylococcus aureus (S. aureus) telah dilakukan. Ekstraksi minyak atsiri dilakukan dengan metode destilasi uap, uji aktivitas antibakteri dilakukan dengan metode sumur difusi, dan identifikasi senyawa dilakukan dengan kromatografi gas-spektroskopi massa (KG-SM). Rendemen minyak yang dihasilkan sebesar 0,1653% (b/b) dengan berat jenis 1,066 g/mL. Minyak atsiri dengan konsentrasi 10% (v/v) menunjukkan  aktivitas penghambatan yang kuat terhadap pertumbuhan E. coli dan S. aureus dengan diameter hambat masing-masing sebesar 11,33 mm dan 13,57 mm. Nilai konsentrasi hambat minimum (KHM) minyak atsiri terhadap E. coli dan S. aureus masing-masing sebesar 4 dan 0,4% dengan zona hambat berturut-turut  6,67 dan 8,83 mm. Kandungan senyawa utama dalam minyak atsiri rimpang jeringau adalah euasaron dan asaron yang telah diketahui memliki  aktivitas sebagai antibakteri. Kata kunci: Minyak atsiri, Acorus calamus Linn, Antibakteri, Escherichia coli, Staphylococcus aureus   ABSTRACT: Isolation of essential oils from rhizome of Jeringau (Acorus calamus Linn) and the antibacterial activity assay against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) has been performed. Essential oil extraction was done by steam distillation method, antibacterial activity test was conducted by diffusion wells, and compound identification was conducted by gas chromatography-mass spectroscopy (GC-MS). The essential oils with a concentration of 10% (v/v) showed a strong inhibitory activity against the growth of E. coli and S. aureus with diameter inhibition of 11.33 mm and 13.57 mm respectively. Minimum inhibitory concentration (MIC) of the oils against E. coli and S. aureus was 4 and 0.4% respectively with the inhibition zone of 6.67 and 8.83 mm. The main compounds of the oils were euasaron and asaron known having antibacterial activity.  
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)

    • Authors: Yuliana Herman Welhelmus Djo, Dwi Adhi Suastuti, Iryanti E. Suprihatin, Wahyu Dwijani Sulihingtyas
      Pages: 137 - 144
      Abstract: ABSTRAK: Fitoremediasi menggunakan eceng gondok (Eichhornia crassipes) bertujuan untuk mengetahui efektivitas penurunan COD (Chemical Oxygen Demand), kandungan logam berat Cu dan Cr limbah cair laboratorium analitik dan mengetahui daya serap eceng gondok terhadap COD dan logam berat Cu dan Cr. Penelitian ini dilakukan dengan membiarkan 840 gram eceng gondok tumbuh dalam 5 liter sampel limbah cair UPT Laboratorium Analitik Universitas Udayana selama 14 hari. COD dan kandungan logam berat Cu dan Cr dalam limbah diukur setiap hari selama  perlakuan. Hasil penelitian menunjukkan terjadinya penurunan COD, kandungan logam berat Cu dan Cr, yang diduga akibat adanya aktivitas biologi yang mengoksidasi senyawa organik maupun anorganik yang terkandung dalam air limbah. Konsentrasi awal COD, Cu dan Cr sebelum perlakuan adalah 47,04; 0,375; dan 2,58 mg/L dan setelah perlakuan selama 14 hari menjadi 26,34; 0,111; dan 0,72 mg/L. Efektivitas penurunan COD, Cu dan Cr berturut-turut 42,36%, 68,73%, dan 42,40%. Daya serap eceng gondok terhadap COD, Cu, dan Cr berturut-turut 0,1232; 0,0016; dan 0,0051 mg/g eceng gondok. Kata kunci: COD, daya serap, eceng gondok, fitoremediasi, limbah laboratorium   ABSTRACT: The study research processing of liquid waste of the Udayana University Analytical Laboratory in way phytoremediation using water hyacinth (Eichhornia crassipes) . Phytoremediation using water hyacinth (Eichhornia crassipes) was conducted to reduce the COD, Cu, and Cr contents of liquid waste of the Udayana University Analytical Laboratory. The study was conducted by allowing 840 grams of water hyacinth to grow in 5 dm3 of the liquid waste for 14 days. The COD, Cu and Cr concentrations in the liquid waste were measured everyday for 14 days, to determine the reduction efectivity and the adsorption capacity of the water hyacinth on those parameters. Results show that all parameters dropped within the 14 day treatment from 47.04; 0.375; and 2.58 mg/L to  26.34; 0.111; and 0.72 mg/L for COD, [Cu], and [Cr] respectively. The reduction efectivity for the respective parameters were 42.36%, 68.73%, and 42.4%. The adsorption capacity were 0.1232; 0.0016; and 0.0051 mg/g water hyacinth respectively.  
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)
           L. Griff)

    • Authors: Ni Luh Rustini, Ni Komang Ariati
      Pages: 145 - 151
      Abstract: ABSTRAK: Penelitian ini dilakukan untuk mengetahui kandungan total fenol, total flavonoid, dan aktivitas antioksidan berbagai fraksi dan ekstrak etanol daun ungu (Graptophyllum pictum L. Griff) secara in vitro. Penentuan total fenol menggunakan metode Manian dengan pereaksi Folin Ciocalteu dan total flavonoid dengan metode Aluminium Klorida. Penentuan aktivitas antioksidan menggunakan metode penangkapan radikal bebas 2,2-difenil-1-pikrilhidrazil (DPPH). Hasil ekstraksi 700 g serbuk kering daun ungu dengan 6000 mL etanol 96% menghasilkan 31 g ekstrak kental yang berwarna ungu kehijauan. Hasil partisi 15 g ekstrak kental etanol dengan pelarut kloroform, etik asetat dan n-butanol menghasilkan 12,5 g ekstrak pekat kloroform, 1,4 g ekstrak pekat etil asetat dan 1,0 g ekstrak pekat n-butanol yang semuanya berwarna ungu. Kandungan total fenol ekstrak etanol, kloroform, etil asetat dan n-butanol berturut-turut sebesar 3870,75 ; 2851,63 ; 7540,12 dan 18455,30 mg/100 g GAE. Kandungan total flavonoid ekstrak etanol, kloroform, etil asetat dan n-butanol berturut-turut sebesar 402,88 ; 98,14 ; 374,45 dan 345,95 mg/100 g QE. Hasil uji aktivitas antioksidan menunjukkan bahwa ekstrak etanol, etil asetat dan n-butanol daun ungu mempunyai kemampuan menangkap radikal bebas DPPH dengan nilai IC50 berturut-turut sebesar 83,25 ppm ; 271,04 ppm dan 385,82 ppm. Ekstrak kloroform daun ungu tidak memiliki kemampuan menangkap radikal bebas DPPH karena memiliki nilai IC50 lebih dari 500 ppm, yaitu sebesar 1365,73 ppm.     ABSTRACT: This research has been done to determine the content of total phenol, total flavonoids and antioxidant activity in vitro of various fractions and ethanol extract of ungu leaves (Graptophyllum pictum L. Griff). Determination of total phenols using Manian method with Folin Ciocalteau reagent and total flavonoids using Aluminium chloride methode. Determination of antioxidant activity using DPPH method.  The extraction of 700 g of dry powder ungu leaves with 6000 mL ethanol of 96 % produces 31 g of concentrated extract greenish purple. The partition of 15 g concentrated ethanol extract with chloroform, ethyl acetate and n-butanol to yield of 12.5 g concentrated  chloroform extract, 1.4 g concentrated extract of ethyl acetate and 1.0 g of n-butanol concentrated extracts of which were purple. The content of total phenol of ethanol, chloroform, ethyl acetate and n-butanol extract in a row amounted to 3870.75; 2851.63; 7540.12 and 18455.30 mg/100 g GAE. The content of total flavonoid of ethanol, chloroform, ethyl acetate and n-butanol extract in a row amounted to 402.88; 98.14; 374.45 and 345.95 mg / 100 g QE. The result of antioxidant activity of ethanol, ethyl acetate and n-butanol extract of ungu leaf have the potent scavenger of free radicals DPPH with IC50 values were 83.25 ppm; 271.04 ppm and 385.82 ppm. Ungu leaf chloroform extract does not have potent scavenger of free radicals DPPH because it has IC50 values was 1365,73 ppm '',  more than 500 ppm,    
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 2 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
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