Subjects -> CHEMISTRY (Total: 928 journals)
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CHEMISTRY (661 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 32)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 15)
ACS Catalysis     Hybrid Journal   (Followers: 57)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 26)
ACS Combinatorial Science     Hybrid Journal   (Followers: 13)
ACS Environmental Au     Open Access   (Followers: 10)
ACS Macro Letters     Hybrid Journal   (Followers: 29)
ACS Materials Letters     Open Access   (Followers: 7)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 45)
ACS Nano     Hybrid Journal   (Followers: 223)
ACS Photonics     Hybrid Journal   (Followers: 16)
ACS Symposium Series     Full-text available via subscription   (Followers: 5)
ACS Synthetic Biology     Hybrid Journal   (Followers: 38)
Acta Chemica Malaysia     Open Access   (Followers: 2)
Acta Chimica Slovaca     Open Access   (Followers: 4)
Acta Chimica Slovenica     Open Access   (Followers: 4)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 12)
Adsorption Science & Technology     Open Access   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 13)
Advanced Functional Materials     Hybrid Journal   (Followers: 76)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 4)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 1)
Advanced Science Focus     Free   (Followers: 8)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 131)
Advances in Chemical Science     Open Access   (Followers: 52)
Advances in Chemistry     Open Access   (Followers: 37)
Advances in Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 15)
Advances in Environmental Chemistry     Open Access   (Followers: 13)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 34)
Advances in Nanoparticles     Open Access   (Followers: 17)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 49)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Sample Preparation     Open Access   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
Aerosol Science and Engineering     Hybrid Journal   (Followers: 2)
African Journal of Chemical Education     Open Access   (Followers: 6)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Aggregate     Open Access   (Followers: 1)
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: 2)
Alchemy : Jurnal Penelitian Kimia     Open Access  
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 8)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 45)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 21)
American Journal of Chemistry     Open Access   (Followers: 37)
American Journal of Plant Physiology     Open Access   (Followers: 9)
Analyst     Hybrid Journal   (Followers: 35)
Analytical Science Advances     Open Access   (Followers: 1)
Angewandte Chemie     Hybrid Journal   (Followers: 169)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 275)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 6)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 14)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 20)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 4)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 8)
Autophagy     Hybrid Journal   (Followers: 8)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Hybrid Journal   (Followers: 248)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 5)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 24)
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: 3)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 85)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 61)
Bioorganic Chemistry     Hybrid Journal   (Followers: 7)
Biopolymers     Hybrid Journal   (Followers: 15)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
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: 25)
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: 1)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 11)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Polymer Technologies and Applications     Open Access  
Carbohydrate Polymers     Hybrid Journal   (Followers: 11)
Carbohydrate Research     Hybrid Journal   (Followers: 23)
Carbon     Hybrid Journal   (Followers: 64)
Carbon Capture Science & Technology     Open Access   (Followers: 1)
Carbon Trends     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 10)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 12)
Cell Reports Physical Science     Open Access   (Followers: 1)
Cellulose     Hybrid Journal   (Followers: 8)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Chem     Hybrid Journal   (Followers: 7)
Chem Catalysis     Hybrid Journal   (Followers: 1)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Hybrid Journal   (Followers: 83)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 27)
Chemical Physics Impact     Full-text available via subscription   (Followers: 1)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 212)
Chemical Science     Open Access   (Followers: 43)
Chemical Science International Journal     Open Access  
Chemical Technology     Open Access   (Followers: 75)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 4)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 39)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 18)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 142)
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: 19)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 7)
Chemistry Education Review     Open Access   (Followers: 2)
Chemistry in Education     Open Access   (Followers: 5)
Chemistry Letters     Full-text available via subscription   (Followers: 43)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 5)
Chemistry of Materials     Hybrid Journal   (Followers: 186)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Hybrid Journal   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 3)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPhysMater     Full-text available via subscription  
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access  
ChemSystemsChem     Hybrid Journal   (Followers: 1)
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: 9)
Chromatographia     Hybrid Journal   (Followers: 21)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 4)
Ciencia     Open Access  
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: 6)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 2)
Combustion Science and Technology     Hybrid Journal   (Followers: 26)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communications Chemistry     Open Access   (Followers: 2)
Communications Materials     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 6)

        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  [61 journals]
           MERAH (Zingiber officinale var rubrum) SECARA IN VITRO

    • Authors: Miftakul Sururi, Ni Wayan Bogoriani, Ida Ayu Raka Astiti Asih
      Pages: 60 - 70
      Abstract: ABSTRAK: Jahe merah adalah umbi yang mengandung antioksidan berupa terpenoid, polifenol dan minyak atsiri yang sangat berguna untuk menurunkan oksidan dalam tubuh manusia. Tujuan dari penelitian ini yakni menentukan IC50 fraksi dari ekstrak jahe merah, kadar total flavonoid dan fenol yang terdapat pada jahe merah dengan aktifitas antioksidan terkuat, dan mengidentifikasi senyawanya. Metode DPPH digunakan untuk menentukan aktivitas antioksidan dan metode Folin-Ciocalteu untuk menentukan total flavonoid dan fenol serta identifikasi senyawa aktif menggunakan LC MS/MS. Nilai IC50 fraksi air, n-heksan, dan fraksi kloroform secara berutut-turut 52,92 µg/ml, 149,92 µg/ml, dan 108,10 µg/ml. dengan total flavonoid dan fenol fraksi air 34,9045 mg/g QE dan 2,37 mg/g GAE. Hasil identifikasi LCMS/MS menunjukkan fraksi air jahe merah mengandung Senyawa antara lain 6-gingerol, Zerumbone, 6-shogaol dan 10-gingerol yang muncul pada waktu retensi  3.89; 5.90; 8.60 dan 10.11. Disimpulkan bahwa fraksi air jahe merah mempunyai aktivitas antioksidan terkuat dengan kandungan senyawa aktif yang berkontribusi sebagai antioksidan.   ABSTRACT: Red ginger is a spice that contains antioxidant compounds of terpenoids, polyphenols, and essential oils which are very useful for reducing oxidants in the human body. The IC50 determination of fraction from extract red ginger, the total levels of flavonoids and phenols found in red ginger with the strongest antioxidant activity, and to identify the compounds. The antioxidant activity determination using DPPH methods and the total flavonoids and phenols determination using Folin-Ciocalteu methods meanwhile the identification of active compounds using LC-MS / MS. The antioxidant activity test showed that the IC50 values ''of the water fraction, n-hexane, and chloroform fraction were 52,92 µg/ml, 149,92 µg/ml, and 108,10 µg/ml, respectively. with total flavonoids and phenols, water fraction 34.9045 mg/g QE, and 2.37 mg / g GAE. The results of LCMS / MS identification showed that the red ginger water fraction contained compounds are 6-gingerol, Zerumbone, 6-shogaol, and 10-gingerol which appeared at retention time of 3.89; 5.90; 8.60, and 10.11. Conclusion is red ginger water fraction has the strongest antioxidant activity with active compounds that contribute as antioxidants.
      PubDate: 2022-12-24
      Issue No: Vol. 10, No. 2 (2022)

    • Authors: Erlin Arda Safitri, Muhamad Abdulkadir Martoprawiro, I Putu Mahendra
      Pages: 71 - 78
      Abstract: ABSTRAK: Film indikator dikembangkan untuk mendeteksi gas amonia yang dihasilkan dari proses pembusukan bahan pangan. Film indikator dapat digunakan sebagai salah satu acuan jaminan mutu dan keamanan suatu bahan pangan bagi konsumen. Film dibuat menggunakan pewarna alami antosianin yang diekstrak dari kubis ungu (Brassica oleracea var. capitata L.) (RGAnc) yang kemudian digabungkan dengan matriks berbahan dasar pati/PVA/selulosa (SPVAC). Ekstrak antosianin kubis ungu (Brassica oleracea var. capitata L.) (RGAnc) menggunakan proses maserasi dengan air deionisasi sebagai pelarut. Adapun massa kubis ungu yang digunakan dalam proses maserasi adalah 1, 10, 100 g. Matriks indikator menggunakan paduan pati/PVA/selulosa dengan rasio 2: 2: 0,1. Pengujian film dilakukan dengan menggunakan daging ayam yang disimpan dengan variasi suhu yaitu suhu ruang (±25 °C) dan 4ºC. Hasil uji film SPVA/RGAnc dengan daging ayam menunjukkan perubahan warna film yang berbeda dan dapat dilihat perbedaannya dengan jelas, sehingga film berpotensi dengan baik sebagai pendeteksi kesegaran daging ayam.   ABSTRACT: An indicator film was developed for monitoring food freshness by detecting ammonia gas produced from the decaying process of chicken meat. The indicator film can be used as a reference for quality assurance and food safety for consumers. The film used natural dyes extracted from purple cabbage (Brassica oleracea var. capitata L.), anthocyanins (RGAnc), which are then combined with starch/PVA/cellulose matrix (SPVAC). Purple cabbage (Brassica oleracea var. capitata L.) anthocyanin was macerated (RGAnc) using deionized water as a solvent. The mass of purple cabbage used in the maceration was varied, e.g., 1, 10, 100 g. The indicator matrix was prepared from the blend of starch/ PVA/ cellulose with a ratio of 2: 2: 0.1. Film testing was carried out using chicken meat stored with variations in temperature, namely room temperature (±25 °C) and 4ºC. The results of the SPVA/RGAnc film test with chicken meat showed different changes in the color of the film and the difference could be seen clearly, so the film had good potential as a detector of freshness of chicken meat.
      PubDate: 2022-10-31
      Issue No: Vol. 10, No. 2 (2022)

    • Authors: I Made Siaka, Dwinda Safitri, Oka Ratnayani
      Pages: 79 - 85
      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 BawangBuleleng, Bali. Analisis logam total, spesiasi dan bioavailabilitas ditentukan dengan menerapkan metode digesti dan ekstraksi bertahap. Kandungan logam Pb dan Cu totaldalam sedimen Pantai Celukan Bawang berturut-turut17,2865-39,4533 mg/kg dan 12,9665-56,1346 mg/kg. Spesies logam Pb paling banyak berada sebagaifraksi 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 terendahberasosiasi dengan fraksi teroksidasi organik (ND-14,18%). Spesies logam Cu juga didominasi olehfraksi 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 terrendahadalah fraksi tereduksi asam (ND-1,14%). Bioavailabilitas logam Pb yang sertamerta bioavailabelberkisar 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 metalcontents in sediments but 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 analysiswere determined by applying a digestion and sequential extraction methods. The total metal contents of Pb and Cu in the sediments were 17.2865-39.4533mg/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 percentagefraction 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 bioavailableand 5.95-16.61% was potentially bioavailable.
      PubDate: 2022-10-31
      Issue No: Vol. 10, No. 2 (2022)
           SPECTROMETRY (ICPE) 9000

    • Authors: Ni Nyoman Trisnawati, I Gst. Ayu Kunti Sri Panca Dewi, Putu Primantari Vikana Suari, Ni Putu Ayu Krismayanti
      Pages: 86 - 90
      Abstract: ABSTRAK: Laboratorium Analitik merupakan laboratorium pendidikan yang berfungsi sebagai penunjang kegiatan Tri Dharma Perguruan Tinggi, yaitu memberikan praktikum kepada mahasiswa, praktek kerja lapangan, membantu uji kimia dalam penelitian mahasiswa dan dosen, serta melayani masyarakat untuk uji kimia dan fisika. Salah satu parameter yang di uji oleh pelanggan adalah Logam Arsen (As). Logam tersebut merupakan salah satu logam yang sangat berbahaya dan beracun sehingga sangat membahayakan kesehatan. Oleh karena itu, logam tersebut diuji menggunakan instrumentasi ICPE 9000 dengan larutan standar Arsen (As) Fixanal. Larutan standar tersebut belum CRM sehingga perlu dilakukan validasi standar. Validasi standar digunakan untuk membuktikan bahwa larutan standar yang digunakan dalam metode uji memenuhi persyaratan sehingga diperoleh data yang akurat dan dapat dipercaya. Adapun manfaat dari penelitian ini adalah untuk mendapatkan larutan standar Arsen yang telah tervalidasi. Metode validasi yang digunakan dalam penelitian ini terbagi menjadi 5 metode yaitu uji presisi, akurasi, LOD, LOQ, dan linieritas. Hasil yang diperoleh pada penelitian ini adalah nilai r sebesar 0,9982, nilai LOD dan LOQ sebesar 0,06 mg/L dan 0,2 mg/L, dan sudah terkonfirmasi, hasil uji akurasi termasuk dalam rentang yang ditetapkan yakni 90 - 110%, hasil uji presisi memiliki nilai % RSD < 2/3 CV Horwitz. Hasil yang diperoleh sudah memenuhi persyaratan sehingga larutan stok standar arsen fixanal sudah valid sebagai standar untuk digunakan dalam metode uji.   ABSTRACT: The Analytical Laboratory of Udayana University is Laboratory work follows the three responsibilities of Higher Education in Indonesia, namely teaching, research and social service. The laboratory serves academic staffs, students of Udayana University and clients outside Udayana University in the area of chemical and physical analysis, research and training. One of the parameter that often tested in this laboratory by academic staffs, students and other clients is Arsenic (As). This metal is one of the most dangerous and toxic metals, because it is very dangerous to health. Therefore, the metal was tested using ICPE 9000 (Inductively Coupled Plasma Emission). Certified standard solutions are usually used to calibrate the instrument but we have standard solution of uncertified arsenic. Because of that, the standard solution with a arsenic standard solution of fixanal have to validated to obtain valid and reliable result. Validation methods in this study consisted of 5 tests namely precision, accuracy, LOD, LOQ and Linearty tests. The results of the five tests were: r value was 0,9982; the value of LOD and LOQ were 0,06 mg/L and 0,20 mg/L respectively and they were already confirmed: result of accuracy was in the range of 90-110 %. Result of precision test was % RSD < 2/3 CV Hortwitz. From the above results it could be concluded that the standard solutions of arsenic that made from fixanal arsenic solution were valid and could be used for arsenic analysis with a reliable result and was valid to use in determination of arsenic (As).
      PubDate: 2022-10-31
      Issue No: Vol. 10, No. 2 (2022)

    • Authors: Oka Ratnayani, Sakinatul Fatimah, Ketut Ratnayani, Ni Made Puspawati
      Pages: 91 - 97
      Abstract: ABSTRAK: Sisa kandungan protein dalam ampas tahu yang masih cukup tinggi perlu dioptimalkan pemanfaatannya dengan cara mengisolasi komponen protein tersebut sehingga diperoleh konsentrat protein ampas tahu dan digunakan sebagi substrat untuk produksi hidrolisat protein. Penelitian ini bertujuan untuk menentukan kemampuan enzim papain dalam menghidrolisis konsentrat protein ampas tahu yaitu dengan menentukan nilai Km (Konstanta Michaelis-Menten) dan Vmaks (Kecepatan Maksimum). Tahap penelitian diawali isolasi protein total sehingga diperoleh konsentrat proteinnya.yang selanjutnya dihidrolisis secara parsial dengan enzim papain sehingga diperoleh produk hidrolisat protein. Proses isolasi protein ampas tahu menggunakan sampel ampas tahu segar dengan metode ekstraksi alkalik dilanjutkan dengan presipitasi isoelektrik mampu menghasilkan serbuk konsentrat protein dengan nilai kadar protein mencapai 50,36% sehingga memenuhi syarat sebagi konsentrat protein. Hasil penentuan nilai Km dan Vmaks enzim papain dalam menghidrolisis substrat konsentrat protein ampas tahu memperoleh nilai Km sebesar 237,0229 mg/mL dan nilai Vmaks sebesar 5,1975 mg/mL/menit. Hal ini menunjukkan bahwa enzim papain mampu menghidrolisis konsentrat protein ampas tahu sehingga menghasilkan produk hidrolisat protein ampas tahu.   ABSTRACT: The remaining protein content in tofu dregs is still quite high, so that its utilization can be optimized by isolating the protein component to obtain the protein concentrate that can be used as a substrate for the production of protein hydrolysates. This study aimed to determine the ability of the papain enzyme to hydrolyze the protein concentrate of tofu dregs through determining the values ''of Km (Michaelis-Menten constant) and Vmax (Maximum Speed). The research steps began with the total protein isolation to obtain the protein concentrate, which was then partially hydrolyzed with papain enzymes to produce protein hydrolysate. The isolation of the tofu dregs protein from fresh tofu dregs samples was done by using an alkaline extraction method followed by isoelectric precipitation resulted in protein concentrate powder with a protein content value of 50.36%, so that it qualified as a protein concentrate. The determination of Km and Vmax values of the papain enzyme in hydrolyzing the protein concentrate substrate of tofu dregs obtained a Km value of 237.0229 mg/mL and a Vmax value of 5.1975 mg/mL/minute. This showed that the papain enzyme was able to hydrolyze the tofu dregs protein concentrate to produce a tofu protein hydrolyzate product.
      PubDate: 2022-10-31
      Issue No: Vol. 10, No. 2 (2022)

    • Authors: Ni Luh Indra Dewi Senisk, I Made Dira Swantara, Ida Ayu Raka Astiti Asih
      Pages: 98 - 104
      Abstract: ABSTRAK: Srikaya (Annona squamosa Linn) merupakan tanaman yang mengandung banyak manfaat yaitu pencegahan penyakit jantung, mencegah penyakit asma, mengatasi penyakit diabetes, mengobati masalah hipertensi mencegah dan mengobati penyakit kanker. Penelitian ini dilakukan untuk mengetahui aktivitas toksik ekstrak dan isolat daun srikaya serta identifikasi kandungan senyawanya. Metode Brine Shrimp Mortality Test (BSLT) digunakan untuk uji toksisitas dan identifikasi senyawa dengan menggunakan instrumen LC MS/MS. Maserasi 750 g serbuk daun srikaya kering menggunakan pelarut metanol menghasilkan 64,45 g ekstrak kental. Uji toksisitas ekstrak kental metanol menunjukkan nilai LC50 sebesar 26,30 ppm. Partisi 45,0 g ekstrak kental metanol menghasilkan 14,3 g ekstrak n-heksana, 2,57 g kloroform dan 9,05 g n-butanol dengan nilai LC50 berturut-turut 104,71; 52,48; dan 323,59 ppm. Pemisahan senyawa pada ekstrak kloroform dilakukan dengan kromatografi kolom menghasilkan empat fraksi dengan fraksi A menunjukkan aktivitas paling toksik dengan nilai LC50 sebesar 100,00 ppm. Analisis LC MS/MS fraksi A menunjukkan adanya senyawa (6S,7'R)-6-hydroxy-4,4,7'-trimethyl-6,7-dihydro-5H-1-benzofuran-2-one (Loliolide); Cocamidopropyl betaine; Linolenic Acid; dan 1-Dodecyl-2-azepanon (Laurocapram).   ABSTRACT: Sugar apple (Annona squamosa Linn) has many benefits, i.e. preventing heart disease, preventing asthma, overcoming diabetes, treating hypertension problems, preventing and treating cancer. This research aims to find out the toxicity of sugar apple leaf extract and isolate and to identify their compounds. Brine Shrimp Mortality Test (BSLT) method was used for toxicity test and identification compounds carried out using the LC MS/MS instrument. Maceration of 750 g of dry sugar apple leaf powder using methanol as solvent yielded 64.45 g of thick extract. Toxicity test of methanol viscous extract showed an LC50 value of 26.30 ppm. Partition of 45.0 g of methanol thick extract produced 14.3 g of n-hexane extract, 2.57 g of chloroform and 9.05 g of n-butanol with LC50 values ''of 104.71; 52.48; and 323.59 ppm respectively. The separation of compounds in the chloroform extract was carried out by column chromatography resulting in four fractions with fraction A showing the highest toxicity with an LC50 value of 100.00 ppm. LC MS/MS analysis of fraction A showed the presence of compound (6S,7'R)-6-hydroxy-4,4,7'-trimethyl-6,7-dihydro-5H-1-benzofuran-2-one (Loliolide) ; Cocamidopropyl betaine; Linolenic Acid and 1-Dodecyl-2-azepanone (Laurocapram).
      PubDate: 2022-12-24
      Issue No: Vol. 10, No. 2 (2022)

    • Authors: I Ketut Budiarta, I Gusti Ayu Kunti Sri Panca Dewi, Ni Made Suaniti
      Pages: 105 - 110
      Abstract: ABSTRAK: Arak merupakan salah satu minuman beralkohol khas Bali yang termasuk golongan C. Konsumsi berlebih dan terus menerus dapat mengakibatkan berbagai gangguan kesehatan sehingga penelitian tentang pengaruh kadar etanol dalam serum tikus wistar yang diberi asupan arak Bali perlu dilakukan. Tikus wistar dikelompokan menjadi 4 kelompok, masing-masing kelompok terdiri dari 6 ekor tikus. Kelompok kontrol tidak diberi asupan arak, kelompok I diberi asupan asupan arak 0,5 mL, kelompok II diberi 1,0 mL dan kelompok III diberi 2,0 mL, setiap hari selama 30 hari. Sampel darah diambil melalui plexus retroorbitalis, kemudian disentrifuse untuk mendapatkan serum untuk dianalisis kadar etanolnya. Kadar etanol dalam arak dan serum dianalisis dengan kromatografi gas detektor ionisasi nyala (GC-FID) tervalidasi. Validasi metode dilakukan dengan menentukan batas deteksi (LOD), batas kuantisasi (LOQ), persen koefisien variasi (% KV) dan %Recovery. Metode analisis ini sudah valid dengan LOD 0,0312 ppm, LOQ 0,1040 ppm, KV 0,85% dan %Recovery 99,77%. Lebih lanjut, peningkatan asupan arak menyebabkan peningkatan kadar etanol dalam serum tikus secara signifikan dengan p'0,05 dimana kadar tersebut sebesar 57,4667±0,70 mg/L, 79,8083±5,89 mg/L 133,4767±5,58mg/L masing-masing untuk kelompok I, II, dan III.     ABSTRACT: Arak is one of the typical Balinese alcoholic beverages that belongs to group C. Continuous consumption of Balinese arak can cause various health problems, so research on the effect of ethanol levels in the serum of wistar rats fed with Balinese arak needs to be done. Wistar rats were devided into 4 groups where each group consisted of 6 rats. Control group 1 was not given alcohol intake, group I was given 0.5 mL of alcohol intake, group II was given 1.0 mL and group III was given 2.0 mL, every day for 30 days. Blood samples were taken through the retroorbital plexus, then centrifuged to obtain serum for analysis of the ethanol content. Ethanol levels in wine and serum were analyzed by validated flame ionization detector gas chromatography (GC-FID). Validation of the method is done by determining the limit of detection (LOD), limit of quantization (LOQ), percent coefficient of variation (% KV) and % recovery. This analytical method is valid with LOD 0.0312 ppm, LOQ 0.1040 ppm, KV 0.85% and %Recovery 99,77. Moreover, increasing the alcohol intake caused a significant increase in ethanol levels in rat serum with p'0.05 which the levels were 57.4667±0.70 mg/L, 79.8083 ±5.89 mg/L and 133.4767±5.58mg/L for group I, II, and III respectively.
      PubDate: 2022-10-31
      Issue No: Vol. 10, No. 2 (2022)

    • Authors: Desmon Tutu Bili, Ida Ayu Raka Astiti Asih, Sri Wahjuni
      Pages: 111 - 116
      Abstract: ABSTRAK: Penelitian ini bertujuan untuk mengetahui potensi ekstrak etanol daun putri malu (Mimosa pudica L) sebagai antihiperglikemia melalui penurunan kadar glukosa darah dan malondialdehide (MDA) tikus putih galur Wistar yang diinduksi streptozotocin. Uji penurunan glukosa darah dan malondialdehide menggunakan 24 ekor tikus Wistar yang dibagi menjadi 6 kelompok yaitu tiga kelompok kontrol dan tiga kelompok perlakuan dengan beragam dosis ekstrak daun putri malu. Dosis yang digunakan pada masing-masing kelompok perlakuan adalah 50, 100, dan 150 mg/kg BB. Kondisi hiperglikemia pada hewan uji dibuat dengan induksi streptozotocin dosis 40 mg/kg BB. Hasil penelitian menunjukkan bahwa ekstrak etanol daun putri malu dapat menurunkan kadar glukosa darah tikus Wistar hiperglikemik dengan dosis 50, 100, 150 mg/kgBB sebesar 45.97, 62.07, 75.27 mg/dL dan penurunan kadar malondialdehide sebesar 2.59, 5.01, 6.01 'M terhadap kontrol negatif. Perbedaan penurunan rerata kadar glukosa darah dan MDA ini dianalisis dengan metode One Way ANOVA dan didapatkan hasil bahwa semua data dari setiap kelompok memiliki perbedaan yang signifikan. Hasil Analisis LC-MS/MS ekstrak etanol daun putri malu teridentifikasi 8 senyawa. Dari 8 senyawa yang teridentifikasi, luteolin dan apigenin merupakan senyawa yang diketahui berperan sebagai antihiperglikemia.   ABSTRACT: The purposes of this research are to determine the potential of Mimosa leaves (Mimosa pudica L) ethanol extract as the antihyperglycemic agent by reducing blood glucose and malondialdehyde (MDA) levels of streptozotocin-induced white rats of Wistar strain. Tests for reducing blood glucose and malondialdehyde used 24 Wistar rats which were divided into 6 groups, namely three control groups and three treatment groups with various doses of mimosa leaf extract. The doses used in each treatment group were 50, 100, and 150 mg/kg BW. Hyperglycemic conditions in test animals were made by induction of streptozotocin at a dose of 40 mg/kg BW. The results showed that the ethanol extract of mimosa leaves could reduce blood glucose levels of hyperglycemic Wistar rats with doses of 50, 100, 150 mg/kg BW by 45.97, 62.07, 75.27 mg/dL and a decrease in malondialdehyde levels by 2.59, 5.01, 6.01 µM against negative controls. The difference in the average decrease in blood glucose and MDA levels was analyzed by the One Way ANOVA method and the results showed that all data from each group had significant differences. The results of the LC-MS/MS analysis of the ethanol extract of the mimosa leaves identified 8 compounds. Of the 8 compounds identified, luteolin and apigenin are compounds known to act as antihyperglycemic agents.
      PubDate: 2022-10-31
      Issue No: Vol. 10, No. 2 (2022)

    • Authors: Ni Desak Komang Ayu Hartani, I Made Siaka, I Wayan Suarsa
      Pages: 117 - 125
      Abstract: ABSTRAK: Penggunaan pupuk anorganik secara terus menerus pada tanah pertanian dapat menyebabkan peningkatan akumulasi logam berat dalam tanah tersebut. Penelitian ini bertujuan untuk mengetahui tingkat pencemaran, bioavailabilitas logam Pb dan Cu dalam tanah, dan kandungan logam tersebut dalam beras yang dihasilkan dari pertanian tersebut. Metode ekstraksi bertahap digunakan untuk spesiasi dan penentuan konsentrasi logamnya menggunakan instrumen AAS. Pada penelitian ini ditemukan bahwa kandungan logam total Pb dan Cu dalam tanah berturut-turut pada kisaran 58,76-70,22 mg/kg dan 66,60-72,31 mg/kg untuk tanah sebelum penanaman padi dan saat panen berkisar 65,33-78,09 mg/kg dan 71,07-82,25 mg/kg. Logam Pb dan Cu yang bioavailable pada tanah sebelum penanaman padi ditemukan paling rendah, yaitu 13,80-19,71% dan 10,82-11,69%, diikuti oleh logam non bioavailable: 35,33-38,83% dan 23,97-35,51%, dan paling tinggi adalah logam yang berpotensi bioavailable, yaitu 44,17-47,37% dan 52,98-64,62%. Akan tetapi, kandungan Pb dan Cu dalam beras berturut-turut 0.12-0,29 mg/kg dan 1,88-2,518 mg/kg. Berdasarkan hasil penelitian ini, tanah pertanian di Desa Kukuh, Tabanan tergolong tidak tercemar menurut nilai the former Greater London Council (GLC), yaitu <500 mg/kg untuk Pb dan <100 mg/kg untuk Cu. Begitu juga, persentase logam yang bioavailable paling rendah, sehingga dapat diprediksi bahwa tidak lebih dari 20% logam-logam tersebut terakumulasi dalam tanaman. Ini terbukti bahwa kandungan Pb dan Cu dalam beras sangat kecil dan berada di bawah ambang batas yang diperbolehkan FAO/WHO, yaitu <0,3 mg/kg untuk Pb dan <10 mg/kg untuk Cu. Dengan demikian, beras yang diproduksi dari tanah pertanian tersebut tidak tercemar logam berat dan aman untuk dikonsumsi.   ABSTRACT: The use of inorganic fertilizers on agricultural soils continuously and excessively can lead to an increase in the accumulation of heavy metals in the soil. This study aimed to determine the level of contamination, the bioavailability of Pb and Cu in soil, and their contents in rice produced from agriculture. The sequential extraction method was used to determine the bioavailability of the metals. In this study, it was found that the total metals content of Pb and Cu in the soil were 58.76-70.22 mg/kg and 66.60-72.31 mg/kg for the soil before planting rice and at harvest time were 65.33-78.09 mg/kg and 71.07-82.25 mg/kg, respectively. The Pb and Cu being bioavailable in the soil before planting rice were found to be the lowest at 13.80-19.71% and 10.82-11.69%, followed by non-bioavailable metals: 35.33-38.83% and 23.97-35.51%, and the highest were the metals being potentially bioavailable: 44.17-47.37% and 52.98-64.62%. However, Pb and Cu contents in rice were 0.12-0.29 mg/kg and 1.88-2.518 mg/kg. Based on the results of this study, agricultural soil in Kukuh Village, Tabanan was classified as unpolluted according to the value of the former Greater London Council (GLC) for Pb <500 mg/kg and <100 mg/kg for Cu). Moreover, it was found that the metals content in the rice was below the maximum limit allowed by FAO/WHO (<0.3 mg/kg for Pb and <10 mg/kg for Cu). Thus, rice produced from the agricultural soil of Kukuh-Tabanan was not contaminated by heavy metals and was safe for consumption.
      PubDate: 2022-10-31
      Issue No: Vol. 10, No. 2 (2022)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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