Subjects -> CHEMISTRY (Total: 1021 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (746 journals)
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    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (49 journals)
    - PHYSICAL CHEMISTRY (71 journals)

CHEMISTRY (746 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal  
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 36)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 14)
ACS Catalysis     Hybrid Journal   (Followers: 76)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 25)
ACS Combinatorial Science     Hybrid Journal   (Followers: 25)
ACS Macro Letters     Hybrid Journal   (Followers: 34)
ACS Materials Letters     Open Access   (Followers: 3)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 49)
ACS Nano     Hybrid Journal   (Followers: 448)
ACS Photonics     Hybrid Journal   (Followers: 19)
ACS Symposium Series     Full-text available via subscription   (Followers: 3)
ACS Synthetic Biology     Hybrid Journal   (Followers: 40)
Acta Chemica Iasi     Open Access   (Followers: 8)
Acta Chemica Malaysia     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 4)
Acta Chimica Slovenica     Open Access   (Followers: 2)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access   (Followers: 1)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Adsorption Science & Technology     Open Access   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 81)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 15)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 14)
Advanced Science Focus     Free   (Followers: 7)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 108)
Advances in Chemical Science     Open Access   (Followers: 50)
Advances in Chemistry     Open Access   (Followers: 39)
Advances in Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 21)
Advances in Drug Research     Full-text available via subscription   (Followers: 27)
Advances in Environmental Chemistry     Open Access   (Followers: 11)
Advances in Enzyme Research     Open Access   (Followers: 13)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 20)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 35)
Advances in Nanoparticles     Open Access   (Followers: 20)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 20)
Advances in Polymer Science     Hybrid Journal   (Followers: 53)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 22)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 7)
Advances in Science and Technology     Full-text available via subscription   (Followers: 17)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 6)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Aggregate     Open Access   (Followers: 3)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 3)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 5)
Alchemy : Jurnal Penelitian Kimia     Open Access   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 71)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 24)
American Journal of Chemistry     Open Access   (Followers: 41)
American Journal of Plant Physiology     Open Access   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 40)
Analytical Science Advances     Open Access   (Followers: 2)
Angewandte Chemie     Hybrid Journal   (Followers: 235)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 353)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 8)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 6)
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: 13)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 16)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 12)
Applied Spectroscopy     Full-text available via subscription   (Followers: 27)
Applied Surface Science     Hybrid Journal   (Followers: 33)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 3)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access   (Followers: 2)
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 3)
Atomization and Sprays     Full-text available via subscription   (Followers: 8)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 7)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 484)
Biochemistry Insights     Open Access   (Followers: 7)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 11)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 3)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 4)
Biomacromolecules     Hybrid Journal   (Followers: 27)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 11)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 4)
BioNanoScience     Partially Free   (Followers: 6)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 213)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 88)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 4)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     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: 26)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
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: 13)
Canadian Mineralogist     Full-text available via subscription   (Followers: 7)
Carbohydrate Polymer Technologies and Applications     Open Access   (Followers: 3)
Carbohydrate Polymers     Hybrid Journal   (Followers: 13)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 76)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 13)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 14)
Cell Reports Physical Science     Open Access  
Cellulose     Hybrid Journal   (Followers: 17)
Cereal Chemistry     Full-text available via subscription   (Followers: 6)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 11)
Chemical and Engineering News     Free   (Followers: 25)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 88)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 28)
Chemical Physics Letters : X     Open Access   (Followers: 4)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 25)
Chemical Reviews     Hybrid Journal   (Followers: 265)
Chemical Science     Open Access   (Followers: 44)
Chemical Science International Journal     Open Access   (Followers: 1)
Chemical Technology     Open Access   (Followers: 71)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 23)
ChemInform     Hybrid Journal   (Followers: 9)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 31)
Chemistry & Industry     Full-text available via subscription   (Followers: 8)
Chemistry - A European Journal     Hybrid Journal   (Followers: 224)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 20)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 24)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry Education Research and Practice     Free   (Followers: 8)
Chemistry Education Review     Open Access   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry Letters     Full-text available via subscription   (Followers: 49)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 336)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Full-text available via subscription   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 14)
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access   (Followers: 1)
ChemSystemsChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 13)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 5)
Ciencia     Open Access   (Followers: 1)
Clay Minerals     Hybrid Journal   (Followers: 9)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 12)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 24)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)

        1 2 3 4 | Last

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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  [68 journals]

    • Authors: Ro’yal Aini, I Nengah Wirajana, Ketut Ratnayani
      Pages: 66 - 72
      Abstract: ABSTRAK: Tujuan penelitian ini adalah untuk mengetahui suhu dan pH optimum selulase dari konsorsium mikroba selulolitik KMS.UU1a dalam kondisi bebas dan terambobilisasi, konsentrasi kalsium alginat optimum untuk amobilisasi selulase, serta keberulangan (reusability) dan efisiensi selulase terambilisasi. Pengukuran aktivitas selulase dilakukan berdasarkan kandungan gula pereduksi sebelum dan sesudah reaksi enzimatis dengan metode Dinitrosalycilic acid (DNS). Aktivitas selulase KMS.UU1a baik dalam kondisi bebas dan teramobilisasi diuji pada suhu 35, 40, 45, 50, 55 dan 60 oC; dan pH 4, 5, 6, 7, 8, dan 9. Konsentrasi sodium alginat yang digunakan dalam proses amobilisasi selulase KMS.UU1a adalah 0,5, 1,0, 1,5, 2,0, 2,5 dan 3,0 % (b/v) dalam CaCl2 0,15 M. Uji keberulangan dilakukan dengan mengukur aktivitas selulase KMS.UU1a amobil pada 4 (empat) kali pemakaian enzim, sedangkan efisiensi diketahui dari uji aktivitas selulase bebas sebelum dan setelah amobilisasi. Konsentrasi kalsium alginat optimum untuk amobilisasi selulase KMS.UU1a adalah 2,0 % (b/v). Suhu optimum selulase KMS.UU1a bebas lebih rendah (40 oC) dibandingkan dengan selulase amobil (45 oC), dengan aktivitas selulase bebas 0,005636 U/mL, lebih tinggi dibandingkan dengan aktivitas selulase amobil 0,003617 U/mL. Selulase KMS.UU1a bebas dan amobil sama-sama memiliki pH optimum 6,0 dengan aktivitas selulase berturut-turut sebesar 0,006444 U/mL dan 0,003771 U/mL. Keberulangan dilihat dari besarnya aktivitas selulase KMS.UU1a amobil pada pemakaian kedua, ketiga, dan keempat terhadap pemakaian pertama berturut-turut sebesar 70,53; 61,66; dan 23,92 %. Efisiensi amobilisasi selulase KMS.UU1a pada kalsium alginate diperoleh sebesar   63,8711 %. ABSTRACT: The purpose of this study was to determine the optimum temperature and pH of cellulase from the KMS.UU1a cellulolytic microbial consortium in free and immobilized conditions, the optimum percentage of calcium alginate used for cellulase immobilization, reusability and efficiency of immobilized cellulase. The enzyme activity was determined by the Dinitrosalycilic acid (DNS) method KMS.UU1a cellulase activity in both free and immobilized conditions was tested at temperatures of 35, 40, 45, 50, 55 and 60 oC; and pH 4, 5, 6, 7, 8, and 9. The concentration of alginate used in the immobilization process of KMS.UU1a cellulase was 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0% (w/v) in 0.15 M CaCl2, was done by measuring the immobilized KMS.UU1a cellulase activity in 4 (four) enzyme usage cycles, while the efficiency was known from the cellulase free activity test before and after immobilization. The optimum concentration of calcium alginate for immobilization of KMS.UU1a cellulase was 2.0% (w/v). The optimum temperature of free KMS.UU1a cellulases was lower (40 oC) compared to immobilized cellulases (45 oC), with free cellulase activity of 0.005636 U / mL, higher than that of immobilized cellulases of 0.003617 U / mL. Both free and immobilized KMS.UU1a cellulases had an optimum pH of 6.0, with cellulase activity of 0.006444 U/mL and 0.003771 U/ mL, respectively. Repetition can be seen from the immobilized KMS.UU1a cellulase activity in the second, third, and fourth cycles of the first cycle respectively of 70.53; 61.66; and 23.92%. The immobilization efficiency of KMS.UU1a cellulase on calcium alginate was 63.8711%.
      PubDate: 2020-10-31
      Issue No: Vol. 8, No. 2 (2020)

    • Authors: Ida Ayu Suci, Yulius Dala Ngapa
      Pages: 73 - 81
      Abstract: ABSTRAK: Kerang ale-ale (Meretrix meretrix) merupakan sumber daya alam potensial di Kabupaten Ketapang Provinsi Kalimantan Barat. Penangkapan kerang ale-ale yang berlangsung sepanjang tahun menghasilkan dampak negatif berupa limbah cangkang yang belum dikelola secara maksimal. Cangkang kerang ale-ale memiliki kandungan kalsium tinggi yang berpotensi untuk dimanfaatkan sebagai prekursor kalsium dalam sintesis hidroksiapatit (HAp). Penelitian ini bertujuan memanfaatkan cangkang kerang ale-ale sebagai prekursor Ca untuk menyintesis HAp, melakukan sintesis HAp dari cangkang kerang ale-ale, dan melakukan karakterisasinya. Analisis serbuk cangkang kerang ale-ale menggunakan Spektrofotometer Serapan Atom (AAS) menunjukkan kandungan kalsium dalam cangkang sebesar 68.04%. Hasil sintesis dengan metode presipitasi double stirring menunjukkan HAp yang diperoleh merupakan fasa tunggal Hap dengan derajat kristalinitas sebesar 90.12% dengan ukuran kristal rata-rata sebesar 41,08 nm. Hasil analisa SEM pada hidroksiapatit menunjukkan partikel berbentuk bola dengan ukuran sekitar 65 nm dan ukuran rata-rata pori yang homogen.   ABSTRACT: Ale-ale clamshell (Meretrix meretrix) is a potential natural resource of Ketapang Regency of West Kalimantan. The ale-ale fishing activities in this region take place throughout the year resulting the negative impact in the form of clamshell waste that has not yet been optimally managed. The ale-ale clamshell contains high calcium content which has the potency to be used as a precursor of calcium in synthesis of hydroxyapatite (HAp). This study aimed to utilize the waste of the ale-ale clamshells as a precursor of calcium in synthesizing of HAp, to synthesize of HAp from ale-ale clamshell, and to carry out the characterizations. Analysis of calcium content by Atomic Absorption Spectroscopy (AAS) showed that ale-ale clamshell was 68.04% (by weight). The double-stirring precipitation method synthesized HAp confirmed the formation of single phase of Hap with crystalinity degree and average crystal zise of 90.12% and 41.08 nm, respectively. The SEM data showed that the HAp has spherical in morphology with around 65 nm in size and homogen average porous size.
      PubDate: 2020-10-30
      Issue No: Vol. 8, No. 2 (2020)
           paradisiaca L.) TERHADAP BAKTERI Staphylococcus aureus dan Escherichia

    • Authors: Wiwik Susanah Rita, Irvansyah Habibi Resaputra, I Made Sukadana
      Pages: 82 - 91
      Abstract: ABSTRAK: Musa x paradisiaca L. merupakan salah satu jenis pisang yang berpotensi sebagai antibakteri. Tujuan penelitian ini adalah untuk mengetahui aktivitas antibakteri ekstrak metanol kulit buah pisang pecah seribu (Musa x paradisiaca L.) terhadap bakteri Staphylococcus aureus dan Escherichia coli serta menentukan kandungan metabolit sekundernya. Ekstraksi dilakukan dengan cara maserasi menggunakan pelarut metanol 95% pengujian aktivitas antibakteri dilakukan dengan metode sumur difusi, dan kandungan metabolit sekuder dalam ekstrak metanol dilakukan dengan uji fitokimia. Hasil uji fitokimia menunjukkan bahwa ekstrak mengandung metabolit sekunder flavonoid, fenol, alkaloid, dan triterpenoid. Hasil uji antibakteri menunjukkan bahwa Konsentrasi Hambat Minimum (KHM) dan Konsentrasi Bunuh Minimum (KBM) ekstrak metanol terhadap Staphylococcus aureus sebesar 4% dan Escherichia coli sebesar 6% dengan daya hambat masing-masing sebesar 6,83 dan 5,25 mm. ABSTRACT: Musa x paradisiaca L. is one type of banana that has potential as an antibacterial. The purpose of this study was to determine the antibacterial activity of the methanol extract of pecah seribu banana peels (Musa x paradisiaca L.) against Staphylococcus aureus and Escherichia coli and determine the content of secondary metabolites. Extraction was carried out by maceration using 95% methanol. Antibacterial activity assay was perfomed by the diffusion well method and the content of secondary metabolites in the methanol extract was carried out by phytochemical tests. The phytochemical test results show that the extract contains secondary metabolites of flavonoid, phenol, alkaloid, and triterpenoid. The antibacterial assay results revealed that the Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) of methanol extract against Staphylococcus aureus of 4% and Escherichia coli of 6% with inhibition of 6.83 and 5.25 mm, respectively.
      PubDate: 2020-10-30
      Issue No: Vol. 8, No. 2 (2020)

    • Authors: Tri Madesa Patadungan, Manuntun Manurung, James Sibarani
      Pages: 92 - 98
      Abstract: ABSTRAK: Teknik ekstraksi pelarut transport aktif (EPTA) merupakan ekstraksi pelarut dengan menambahkan zat lain yang berfungsi ganda sebagai ekstraktan dan zat aktif permukaan. Tujuan penelitian ini adalah menentukan persentase recovery logam paladium (II) yang terekstraksi dari sampel limbah industri pertambangan dengan teknik EPTA pada kondisi optimum dari parameter ekstraksi. Metode penelitian yang digunakan adalah teknik EPTA. Hasil penelitian menunjukkan bahwa kondisi terbaik ekstraksi untuk teknik EPTA menggunakan larutan standar Pd (II) 100 ppm adalah waktu ekstraksi selama 20 menit, laju putaran pengadukan sebesar 1000 rpm, konsentrasi HCl pada fasa air adalah 0,25 M, dan konsentrasi trioktilmetilamonium klorida (TOMAC) pada fasa organik adalah 0,033 M sedangkan pada sampel limbah industri pertambangan dapat mentranspor rata-rata sekitar 61,04 ± 1,88%  yang mengandung Pd (II) sebesar 320 ppm. ABSTRACT: Active transport solvent extraction technique (EPTA) is a solvent extraction by adding other substances that act as extractants and surface active agent. The purpose of this study was to determine the percentage of recovery of palladium (II) extracted from mining industry waste samples with the EPTA technique at the optimum conditions of the extraction parameters. The research method used is the EPTA technique. The results showed that the best extraction conditions for the EPTA technique using Pd (II) standard solution of 100 ppm were extraction time of 20 minutes, stirring rate of 1000 rpm, HCl concentration of 0.25 M in the aqueous phase, and methyltrioctylammonium chloride (TOMAC) concentration of 0.033 M in the organic phase. The extraction process using the optimum conditions can only transport about 61,04 ± 1,88% of Pd (II) content out of 320 ppm from the mining industrial waste sample.
      PubDate: 2020-10-30
      Issue No: Vol. 8, No. 2 (2020)

    • Authors: Zigela Luis Corvelo Sarmento, Olivia Santavena Goncalves Rangdi, Benilda Mariaa Cesario De Sena, Kadek Nadia Martha Dewi
      Pages: 99 - 104
      Abstract: ABSTRAK: Parasetamol dan kafein menjadi kombinasi dalam persediaan obat untuk dapat memberikan efek analgetik. Penggunaan ini menjadi semakin meningkat untuk dapat mencapai efek yang baik dalam pengawasan zat aktif dalam formulasi farmasetik. Penelitian ini bertujuan untuk dapat melakukan preparasi untuk sediaan tablet dengan kandungan parasetamol dan kafein. Desain penelitian adalah eksperimental menggunakan metode HPLC dengan detektor dan direkam dalam bentuk kromatogram dengan kolom reversed phase C18 dengan ukuran 4.6 mm x 10 cm. Temperatur kolom 45 ± 1 oC dan fase gerak melalui membran filter dengan kecepatan 2 mL/menit dengan detector UV 275 nm. Pada penelitian ini dilakukan uji kesesuaian sistem serta penentuan presisi dan akurasi metode analisis. Hasil penelitian ini menunjukkan bahwa uji kesesuaian sistem memenuhi syarat dengan deviasi relatif (RSD). Berdasarkan metode yang dilakukan terdapat validasi metode presisi, akurasi, linieritas, LOD dan LOQ diterima. Nilai RSD larutan uji parasetamol dan kafein berturut-turut adalah 0,4437% dan   2,8959%. Untuk validasi presisi diperoleh rata-rata % recovery larutan uji parasetamol dan kafein berturut-turut adalah 100,01758% dan 97,42951907%. Nilai LOD dan LOQ diperoleh berturut-turut adalah sebesar 26.74885159 ng/10µL dan 89,162838 ng/10µL. Kadar larutan sampel parasetamol 998,226 ng/10µL. Dengan demikian, karena kadar sampel parasetamol melebihi nilai batas deteksi sehingga sampel parasetamol dapat dideteksi namun tidak dapat dikuantifikasi. ABSTRACT: Paracetamol and caffeine become a combination of drug supplies to provide analgesic effects. This use is increasingly being used to achieve a good effect on the control of active substances in pharmaceutical formulations. This study aims to be able to acurately prepare tablets containing paracetamol and caffeine. The research design was experimental using the HPLC method with a detector with a 4.6 mm x 10 cm long packing column C18. The temperature of the reversed-phase column was 45 ± 1 oC and the moving phase through the filter membrane at a rate of 2 mL/minute with a 275 nm UV detector. In this study, the system suitability test was carried out by determining  the precision and accuracy of the analytical method. The results of this study indicate that the system suitability test meets the requirements with relative deviation (RSD). Based on the method used, there are validation methods for precision, accuracy, linearity, LOD, and LOQ are accepted. The RSD value of the paracetamol and caffein test solutions were 0.4437% and 2.8959%, respectively. For precision validation, the average % recovery for the paracetamol test solution was 100.01758% and the average% recovery for the caffeine test solution was 97.43%. Then, for the validation of the method, the LOD and LOQ  were 26.7489 ng / 10µL and 89.1628 ng / 10µL respectively.The paracetamol concentration of sample solution was 998.226 ng / 10µL. Since  the paracetamol sample level exceeds the detection limit value so that the paracetamol sample can be detected but can not be quantified.
      PubDate: 2020-10-30
      Issue No: Vol. 8, No. 2 (2020)

    • Authors: Yulius Dala Ngapa, Yasinta Embu Ika
      Pages: 105 - 113
      Abstract: ABSTRAK: Limbah yang berasal dari industri tekstil dianggap sebagai sumber potensial pencemaran lingkungan khususnya air  karena mengandung pewarna yang berbahaya. Dalam penelitian ini zeolit alam digunakan sebagai alternatif adsorben yang efektif dan efisien untuk mengatasi pencemaran akibat pewarna biru metilena dan metil oranye. Aktivasi zeolit alam dilakukan dengan larutan HCl 3 M dan dikarakterisasi menggunakan difraksi sinar-X (XRD) dan Scanning Electron Microscope (SEM). Proses adsorpsi biru metilena dan metil oranye dipelajari pada variasi bobot adsorben, waktu kontak,  dan pH. Konsentrasi zat pewarna yang tertinggal dalam larutan diamati dengan instrumen Spektrofotometer UV-Vis.  Hasil penelitian menunjukkan bahwa kapasitas adsorpsi zeolit alam dalam menjerap biru metilena sebesar 21,189 mg/g dan dan metil oranye sebesar 18,208 mg/g. Kondisi optimum adsorpsi biru metilena dan metil oranye dicapai dengan bobot adsorben berturut-turut 0,3 g dan 0,4 g, waktu kontak berturut-turut 60 menit dan 90 menit, serta pH berturut-turut 6 dan 2. Faktor bobot adsorben, waktu kontak, dan pH memberikan pengaruh terhadap penjerapan biru metilena maupun metil oranye oleh zeolit alam Ende. ABSTRACT: Waste from the textile industry is considered as a potential source of environmental pollution, especially water because it contains dangerous dyes. In this research, natural zeolite was used as an effective and efficient alternative adsorbent to overcome pollution caused by methylene blue and methyl orange dyes. Activation of natural zeolite was carried out with aqueous solution of HCl 3 M and characterized using X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). The methylene blue and methyl orange adsorption processes were studied on various weight of the adsorbent, contact time, and pH. The concentration of dyes remaining in the solution was observed with Spectrophotometer UV-Vis. The results showed that the adsorption capacities of activated natural zeolite were 21.189 mg / g and 18.208 mg / g for methylene blue and methyl orange, respectively. The optimum conditions of methylene blue were 0.3 g of adsorbent weight, 60 minutes of contact time, and 6 of pH while for the methyl orange adsorption were achieved at  0,4 g of adsorbent weight, 90 minutes of contact time and 2 of pH.
      PubDate: 2020-11-23
      Issue No: Vol. 8, No. 2 (2020)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762

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