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  Subjects -> CHEMISTRY (Total: 843 journals)
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CHEMISTRY (594 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 34)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 18)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 233)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 55)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 15)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
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Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
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Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
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: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 27)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 40)
Angewandte Chemie     Hybrid Journal   (Followers: 172)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 217)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 3)
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)
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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: 15)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 305)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
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: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
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: 113)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 93)
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: 2)
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: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 4)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 13)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 184)
Chemical Science     Open Access   (Followers: 22)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 58)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 142)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 256)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
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: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
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: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
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Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
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Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
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Current Science     Open Access   (Followers: 60)
Dalton Transactions     Full-text available via subscription   (Followers: 22)
Detection     Open Access   (Followers: 2)
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Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 3)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 3)
Environmental Chemistry     Hybrid Journal   (Followers: 7)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)
Environmental Science : Nano     Partially Free   (Followers: 1)
Environmental Toxicology & Chemistry     Hybrid Journal   (Followers: 17)

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Journal Cover Cakra Kimia (Indonesian E-Journal of Applied Chemistry)
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   ISSN (Online) 2302-7274
   Published by Universitas Udayana Homepage  [28 journals]
  • SIFAT FISIKOKIMIA HAND AND BODY CREAM DENGAN PEMANFAATAN EKSTRAK ETANOL
           BUNGA GEMITIR (Tagetes erecta L.) DAN BUNGA PACAR AIR MERAH (Impatiens
           balsamina L.) DARI LIMBAH CANANG

    • Authors: Dewa Ayu Ika Paramitha, James Sibarani, Ni Made Suaniti
      Pages: 1 - 11
      Abstract: ABSTRAK: Pada penelitian ini dilakukan pengembangan formula sediaan hand and body cream dengan memanfaatkan sumber antioksidan yang dimiliki oleh dua jenis ekstrak etanol yaitu ekstrak bunga pacar air merah (Impatiens balsamina L.) dan bunga gemitir (Tagetes erecta L.) dengan taraf perlakuan sebesar 1% dari masing-masing ekstrak (FPM dan FG) dan campuran 0,5% ekstrak pacar air merah dan 0,5% ekstrak gemitir (FCPMG). Pengujian terhadap  produk dilakukan pada sifat fisikokimia  meliputi pH, viskositas, aktivitas antioksidan, angka lempeng total mikroba, dan ukuran partikel. Berdasarkan hasil pengujian produk hand and body cream yang dihasilkan memiliki antioksidan yang cukup tinggi sebagai produk perawatan tubuh dengan penambahan 1% ekstrak etanol pacar air merah, gemitir dan campuran dari kedua ekstrak etanol. Kualitas produk hand and body cream yang dihasilkan baik dan memenuhi standar mutu SNI dari aspek nilai pH, viskositas, dan nilai ALT. Warna yang dihasilkan mulai dari warna kuning kemerahan sampai dengan warna kuning, dan partikel yang dimiliki oleh produk adalah nanopartikel dengan sistem polidispersi. ABSTRACT: Formulations of hand and body creams using ethanol extracts of flowers of red Impatiens balsamina L. And Tagetes erecta L. As antioxidant sources have been developed.  One percent of  extracts (FPM and FG) and the mixture of 0.5% each extracts (FCPMG) were added to the basic formula. The analysis of physicochemical properties of the products was conducted including pH, viscosity, antioxidant activity, the size of the particles, and total microbial plate numbers. Based on the results, the quality of the hand and body creams meet the national standard of Indonesia (SNI) regarding to pH, viscosity, and the total microbial numbers. The colours of the hand and body creams resulted are reddish yellow to yellow with polydispersion nanoparticles.
      PubDate: 2017-07-28
      DOI: 10.24843/CK.2017.v05.i01.p01
      Issue No: Vol. 5, No. 1 (2017)
       
  • ISOLASI SENYAWA TURUNAN NAPTOKUINON DARI KULIT BATANG FALOAK (Sterculia
           quadrifida R.BR) DAN UJI AKTIVITAS ANTIKANKER PADA SEL KANKER PAYUDARA
           JENIS T47D

    • Authors: Rollando Rollando, Rokiy Alfanaar
      Pages: 12 - 17
      Abstract: ABSTRAK: Faloak (Sterculia quadrifida R.Br) digunakan secara empiris oleh penduduk Nusa Tenggara Timur untuk mengobati hepatitis, tifus, maag, dan pemulih stamina. Informasi senyawa aktif yang terkandung didalam kulit faloak secara spesifik belum dipublikasi. Penelitian ini bertujuan untuk mengetahui senyawa aktif yang terdapat didalam kulit faloak sebagai antikanker. Ekstraksi menggunakan metode maserasi, isolasi menggunakan metode isolasi bertingkat, elusidasi menggunakan penggabungan informasi dari spektra IR, 1D-NMR, 2D-NMR dan LC-MS, dan uji aktivitas antikanker pada sel kanker payudara T47D menggunakan metode MTT. Hasil isolasi diperoleh isolat turunan senyawa naptokuinon yaitu 2,3-dihydro-6-hydroxy-2-methylenenaphtho[1,2-b]furan-4,5-dione yang aktif sebagai antikanker dengan nilai IC50 pada sel kanker payudara sebesar 9,88 µg/mL dan dengan nilai selektivitas indeks sebesar 30,23.     ABSTRACT: Faloak (Sterculia quadrifida R.Br) is used empirically by residents of East Nusa Tenggara to treat hepatitis, typhoid, ulcers, and stamina restorers. The information of the active compounds contained in the faloak skin is not specifically published. This study aims to determine the active compounds contained in the bark of faloak as anticancer. The extraction was conducted with maceration method followed by a multilevel isolation method. The elucidation was carried out using information of IR spectra, 1D-NMR, 2D-NMR and LC-MS. The anticancer activity test on T47D breast cancer cells was also conducted using MTT method. Based on the results obtained, the active compound is naphthoquinone derivative compound which is 2,3-dihydro-6-hydroxy-2-methylenenaphtho [1,2-b] furan-4,5-dione that has anticancer activity on breast cancer cell (T47D) with IC50 value of 9.88 µg/mL and index selectivity value of 30.23.
      PubDate: 2017-07-28
      DOI: 10.24843/CK.2017.v05.i01.p02
      Issue No: Vol. 5, No. 1 (2017)
       
  • REDUKSI KOMPONEN TOKSIK DARI LIMBAH CAIR GARMEN MENGGUNAKAN
           BIO-ANORGANIK-SORBEN ARANG TULANG

    • Authors: Ni Gusti Ayu Made Dwi Adhi S, I Nengah Simpen, Anak Agung Bawa Putra
      Pages: 18 - 25
      Abstract: ABSTRAK: Tujuan penelitian ini adalah mempelajari kemampuan adsorpsi arang tulang sapi teraktivasi NaOH 0,4 M untuk menurunkan (reduksi) karakteristik tingkat kekeruhan, COD (chemical oxygen demand), kandungan Cr dan Pb dari limbah garmen yang dibandingkan dengan tanpa aktivasi. Kemampuan adsorpsi arang tulang tanpa dan teraktivasi (bio-anorganik-sorben) terhadap karakteristik limbah tersebut dikaitkan dengan karakterisasi (keasaman permukaan, jumlah situs aktif, gugus fungsi dan luas permukaan spesifik) serta waktu dan volume interaksi optimum. Hasil yang diperoleh bahwa aktivasi arang tulang dengan larutan NaOH 0,4 M dapat meningkatkan karakteristiknya (keasaman permukaan, jumlah situs aktif, intensitas gugus fungsi O-H dan luas permukaan spesifik) dibandingkan dengan yang tanpa aktivasi. Aktivasi NaOH pada arang tulang dapat meningkatkan kemampuan adsorpsi dalam menurunkan tingkat kekeruhan, COD, dan kandungan Cr dan Pb dari sampel limbah cair garmen dibandingkan dengan kemampuan arang tanpa aktivasi. Waktu interaksi optimum yang diperlukan dalam menurunkan karakteristik tingkat kekeruhan dan COD adalah 90 menit, dengan volume interaksi optimum 20 mL.   ABSTRACT: The aim of this reseach was to study the adsorption ability of cow bone charcoal activated with 0.4 M NaOH to reduce the turbidity level, the chemical oxygen demand (COD), the Pb and Cr content of garment waste water and to compare with the non-activated ones. The adsorption ability of both activated and non-activated bone charcoal (bio-inorganic-sorbent) was related to their characteristics which are the surface acidity, the active sites, the fuction groups, the specific surface area, the volume and time optimum interaction as well. The result showed that activation can increase the surface acidity, the active sites, the O-H fuction groups intensity and the specific surface area compared with non-activated ones. The activated charcoal significantly reduced the COD and the turbidity level, the Pb and Cr content of garment waste water comparing with the non-activated ones. Time contact optimum to reduce its characteristics is 90 minutes and volume interaction optimum is 20 mL.
      PubDate: 2017-07-28
      DOI: 10.24843/CK.2017.v05.i01.p03
      Issue No: Vol. 5, No. 1 (2017)
       
  • ISOLASI DAN IDENTIFIKASI SENYAWA ANTIOKSIDAN GOLONGAN FLAVONOID DARI
           EKSTRAK ETIL ASETAT DAUN PRANAJIWA (Euchresta horsfieldii Lesch Benn.)

    • Authors: Ni Wayan Rika Kumara Dewi, I Wayan Gunawan, Ni Made Puspawati
      Pages: 26 - 33
      Abstract: ABSTRAK: Penelitian ini bertujuan untuk menentukan aktivitas antioksidan dan mengidentifikasi senyawa golongan flavonoid yang terkandung dalam ekstrak etil asetat daun pranajiwa (Euchresta horsfieldii Lesch Benn.). Uji aktivitas antioksidan dilakukan secara invitro dengan metode DPPH (1,1-diphenyl-2-pycrylhidrazyl). Teknik pemisahan dilakukan dengan kromatografi kolom dan diidentifikasi dengan spektrofotometer FTIR dan UV-Vis. Hasil penelitian menunjukkan bahwa ekstrak etil asetat memiliki aktivitas antioksidan dengan nilai IC50 sebesar 393,95 µg/mL dan kadar total flavonoid sebesar 6619,72 mg QE/100g atau 6,62 % QE. Pemisahan dan pemurnian ekstrak etil asetat menggunakan fase diam silika gel 60 dan fase gerak n-heksana:kloroform: etanol (20:1:1) yang menghasilkan isolat aktif yang positif flavonoid (isolat FE) yang diduga merupakan senyawa flavonoid golongan flavonol yaitu 3,5,7,3’,4’-pentahidroksi flavonol.   ABSTRACT: The present study was conducted to determine antioxidant activity and to identify the flavonoid active compounds from ethyl acetate extracts of Pranajiwa leaves. In vitro antioxidant activity was carried out using DPPH (1,1-diphenyl-2-pycrylhidrazyl) method. The separation of the ethyl acetate extracts was conducted by column chromatography and the identification by using FTIR and UV-Vis spectrophotometer. The results showed that ethyl acetate extract has antioxidant activity with IC50 value of 393,95 µg/mL and the total flavonoid of 6619,72 mg QE /100g or 6,62% QE. The separation and purification of  ethyl acetate extract was chromatography column on silica gel 60 and the solvent n-hexane:chloroform:ethanol (20:1:1) based on UV-Vis and Infrared spectra positive flavonoid isolate (isolates FE) was tentaviely identified as 3,5,7,3',4'-pentadihydroxy flavonols.    
      PubDate: 2017-07-28
      DOI: 10.24843/CK.2017.v05.i01.p04
      Issue No: Vol. 5, No. 1 (2017)
       
  • IDENTIFIKASI PEWARNA MERAH K3 (CI 15585) DALAM PRODUK KOSMETIK SEDIAAN
           PERONA MATA SECARA LC- MS/MS

    • Authors: Riana Suastari Rahayu, Iryanti Eka Suprihatin, Wiwik Susanah Rita
      Pages: 34 - 42
      Abstract: ABSTRAK : Identifikasi merah K3 dalam sediaan perona mata secara LC-MS/MS dilakukan untuk mengkonfirmasi keberadaannya yang sering kali ditemukan dalam konsentrasi kecil. Metode spektrofotometeri UV-VIS dan HPLC tidak cukup untuk mengkonfirmasi keberadaan merah K3 yang dinyatakan positif dengan metode KLT. Optimasi metode dilakukan pada kondisi spektrometer massa dan sistem kromatografi cair yang berlaku pada LC-MS/MS sebelum dilakukan proses identifikasi. Hasil optimasi menunjukkan identifikasi merah K3 dengan LC-MS/MS menggunakan teknik ionisasi elektrospray (ESI) dan sistem Multiple Reaction Monitoring (MRM) pada mode ionisasi negatif. Ion prekursor pada m/z 375 dan ion produk pada m/z 204, 80, 140 digunakan untuk identifikasi.   ABSTRACT : Identification of red dye (CI 15585) using LC-MS/MS in eye shadow was performed to confirm its presence in very low concentrations. The UV-VIS spectrophotometry and HPLC are not sufficient to confirm the presence of red dye identified by the TLC. The optimation of the method was carried out under the condition applicable to LC-MS / MS prior to identification process. Optimation results show that red dye can be identified with LC-MS/MS using electrospray ionization technique (ESI) and Multiple Reaction Monitoring (MRM) system under negative ionization mode. The precursor ion at m / z 375 and the product ions at m / z 204, 80, 140 are used for identification.      
      PubDate: 2017-07-28
      DOI: 10.24843/CK.2017.v05.i01.p05
      Issue No: Vol. 5, No. 1 (2017)
       
  • OPTIMASI RASIO MOLAR DAN WAKTU REAKSI PADA PEMBUATAN BIODIESEL DARI MINYAK
           BIJI MALAPARI (Pongamia Pinnata L.) DENGAN KATALIS ABU SEKAM PADI
           TERMODIFIKASI LITIUM

    • Authors: Komang Ayu Tri Lestari, I Nengah Simpen, Sri Rahayu Santi
      Pages: 43 - 51
      Abstract: ABSTRAK: Minyak biji malapari merupakan bahan baku yang potensial untuk produksi biodiesel. Penelitian ini mempelajari optimasi rasio molar minyak:metanol dan waktu reaksi pada produksi biodiesel menggunakan minyak biji malapari dalam reaksi transesterifikasi dengan katalis abu sekam padi termodifikasi litium (Li). Variasi parameter yang digunakan untuk mendapatkan kondisi optimum yaitu rasio molar minyak:metanol dengan perbandingan 1:6; 1:9 dan 1:12 dengan waktu reaksi 150, 180, dan 210 menit menggunakan massa katalis 3% pada suhu reaksi 60-65OC. Kebasaan permukaan, situs aktif, dan morfologi permukaan katalis heterogen sebelum transesterifikasi (Li-ASP1) dan setelah transesterifikasi (Li-ASP2) dikarakterisasi. Hasil penelitian menunjukkan bahwa yield biodiesel tertinggi yaitu 88,37% diperoleh pada rasio molar minyak:metanol sebesar 1:9 dengan waktu reaksi 150 menit. Biodiesel tersebut telah memenuhi Standar Nasional Indonesia (SNI) 04-7182-2006 dengan massa jenis, viskositas,  bilangan asam, bilangan iod, kadar air, dan bilangan setana berturut-turut  sebesar 885,3 kg/m3; 5,75 cSt; 0,27mgKOH/g; 45,89 g I2/100g biodiesel, 0,01% dan 65,13. Nilai kebasaan permukaan katalis Li-ASP1 yaitu ±mmol.g-1 lebih besar dibandingkan dengan nilai kebasaan katalis Li-ASP2 sebesar ±mmol.g-1, situs aktif katalis Li-ASP1 sebesar 1,2103 x 1022  atom g-1 memiliki nilai yang lebih tinggi dibandingkan katalis Li-ASP2 sebesar x 1022 atom g-1. Morfologi permukaan katalis Li-ASP1 dan Li-ASP2 menunjukkan bahwa distribusi pori terlihat kurang homogen dengan bentuk partikel yang terdistribusi secara tidak merata.   ABSTRACT: Pongamia oil is a potential oil for producing biodiesel. The aim of this research is to find the optimum conditions of  transesterification rection of pongamia oil using lithium-modified rice husk ashes (Li-ASP) in producing biodiesel. The molar ratio of oil:methanol (1:6; 1:9; and 1:12) and the reaction time (150; 180; and 210 minutes) were used as parameters using 3% (w/w) of the catalyst at reaction temperature of 60-65oC. Moreover, the heterogeneous catalysts before the transesterification (Li-ASP1) and after transesterification (Li-ASP2) were characterized by their surface alkalinities, active sites and surface morphologies. The results showed that the highest biodiesel yield of 88,37% was gained at molar ratio  of  oil:methanol of 1:9 and 150 minutes of the reaction time. The obtained biodiesel fulfills the Indonesian Nasional Standards (SNI 04-7182-2006) with values of density, viscosity,  acid number, iod number,   water content, and  cetane number 885.3kg / m3; 5.75 cSt; 0,27mgKOH/g; 45.89 g I2/100g biodiesel; 0.01%; and 65.13, respectively. The surface alkalinity of Li-ASP1 of ±mmol.g-1which is higher than the one of Li-ASP2 of ±mmol.g-1.  The active sites of Li-ASP1 of 1.2103 x 1022 atoms g-1 are higher than the ones of Li-ASP2 catalyst of 0.6414 x 1022 atoms g-1. The surface morphologies of both Li-ASP1 and Li-ASP2 indicate that non-homogenous pore distribution showing the unevenly distributed particles.
      PubDate: 2017-07-28
      DOI: 10.24843/CK.2017.v05.i01.p06
      Issue No: Vol. 5, No. 1 (2017)
       
 
 
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