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INDONESIA
Indonesian Journal of Chemical Science
Published by Universitas Negeri Semarang
ISSN : 22526951     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue " Vol 6 No 3 (2017)" : 15 Documents clear
Konversi Gondorukem menjadi Fine Chemicals melalui Reaksi Hydrocracking Menggunakan Katalis Ni-Mo/γ-Al2O3 Jayanti, Yeni Fitriana; Savitri, Savitri; Rinaldi, Nino; Priatmoko, Sigit; Jumaeri, Jumaeri
Indonesian Journal of Chemical Science Vol 6 No 3 (2017)
Publisher : Indonesian Journal of Chemical Science

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Abstract

A preliminary study of the conversion of rosin oil to fine chemicals through hydrocracking reactions using Ni-Mo/γ-Al2O3 catalysts has been studied. The purpose of this study was to determine the effect of temperature, initial pressure of hydrogen gas, and reaction time to the reaction of hydrocracking of rosin oil to produce fine chemicals. Hydrocracking of rosin oil is performed on a batch autoclave reactor by varying the reaction temperature (300-350 °C), hydrogen gas pressure (10-40 bar), and reaction time (60-240 min). The amount of Ni-Mo/γ-Al2O3 catalyst used is 1% w/w of rosin oil. The results showed that the compounds contained in rosin oil experienced hydrocracking reaction with the use of high reaction temperature. The use of low hydrogen gas pressure is able to split of rosin oil into fine chemicals, whereas the long reaction time results in the rosin oil being crushed producing more products. The hydrocracking reaction of rosin oil using Ni-Mo/γ-Al2O3 catalyst produces the optimum product if high temperatures used with low hydrogen gas usage and reaction time are used relatively long.
Bioremediasi Logam Pb pada Limbah Tekstil dengan Staphylococcus aureus dan Bacillus subtilis Maulana, Alfian; Supartono, Supartono; Mursiti, Sri
Indonesian Journal of Chemical Science Vol 6 No 3 (2017)
Publisher : Indonesian Journal of Chemical Science

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Abstract

Limbah cair industri tekstil mengandung logam berat yang bersifat toksik sehingga perlu dilakukan proses pengolahan limbah. Bioremediasi merupakan salah satu metode alternatif  untuk menurunkan kadar logam berat dalam limbah. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh penambahan mikroba eksogen Staphylococcus aureus dan Bacillus subtilis terhadap jumlah total sel bakteri pada proses bioremediasi logam Pb sedimen sungai setu dengan metode TPC (total plate count) dan destruksi basah. Mikroba eksogen yang digunakan pada penelitian ini adalah S.aureus dan B. subtilis dengan konsentrasi masing-masing 10 dan 20%. Pengujian sampel dilakukan sebelum dan sesudah perlakuan menggunakan SSA (Spektrofotometer Serapan Atom) kemudian dihitung penurunan kadarnya. Hasil penelitian menunjukkan jumlah total sel tertinggi dengan perlakuan kontrol negatif sebanyak 4,3x108 CFU/mL. Persen penurunan kadar logam Pb tertinggi dengan perlakuan S. aureus 20% sebesar 95,85%, dan waktu inkubasi optimum pada 30 hari.
Perbandingan Daya Antibakteri Ekstrak dan Minyak Piper betle L. terhadap Bakteri Streptococcus mutans Pangesti, Rizki Dwi; Cahyono, Edy; Kusumo, Ersanghono
Indonesian Journal of Chemical Science Vol 6 No 3 (2017)
Publisher : Indonesian Journal of Chemical Science

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Abstract

Piper betle has been known as against gram positif and gram negatif bacterial including Streptococcus mutans. S. mutans is the main cause of periodental desease. The purpose of this study is to compare antibacterial power between extract and piper betle oil against S. mutans. Amoxcicilin is used as positive control and ethanol 96% for the negative one. The result show that piper betle oil is more effective than its extract against S. mutans. to know the chemical component Piper betle oil analys by GC-MS while extract screen by fitochemical. Then piper betle oil distillation fractionation was done to produce fraction I, fraction II and fraction III. Each fraction beeing tested antibacterial and analysing by GC. Second fraction is more potential to be antibacterial because it has chavicol compounds (15.039%) which is the one of the phenol group that stronger than the other phenol
Isolasi dan Uji Antibakteri Minyak Daun Sirih Hijau dan Merah Terhadap Streptococcus mutans. Rizkita, Aden Dhana; Cahyono, Edy; Mursiti, Sri
Indonesian Journal of Chemical Science Vol 6 No 3 (2017)
Publisher : Indonesian Journal of Chemical Science

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Abstract

The purpose of this research is to identify the chemical content and compare the antibacterial effect of Piper betle L and Piper crocatum R oil against Streptococcus mutan. Betel oil is made at 100%, 75%, 50%, 25% concentration and amoxicillin 0.2% as positive control and propylene glycol as negative control. The research method started with oil isolation using distillation of steam and water then identified the content using GC-MS. Antibacterial activity was tested against Streptococcus mutans by disc diffusion method. The results of this research indicate that Piper betle L and Piper crocatum R oil contains terpenoid group compounds. After being characterized using GC-MS, betel oil contains 5 major active compounds that have antibacterial activity that is Sabinene, Myrsene, Camphene, Germacrene and β - Chariophillene. Piper betle oil has better antibacterial properties than Piper crocatum oil with clear zone reaches 10.5 mm while Piper crocatum oil is 7.1 mm.
Konversi Gliserol menjadi Polihidroksibutirat dengan Menggunakan Bakteri Eschericia coli Rahayu, Endah Fitriani; Trisunaryanti, Wega; Wijaya, Karna
Indonesian Journal of Chemical Science Vol 6 No 3 (2017)
Publisher : Indonesian Journal of Chemical Science

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Abstract

Conversion of glycerol into polyhydroxybutyrate (PHB) using Eschericia coli bacteria had beed evaluated. The bacteria was cultured in lactose medium, consist of 1% of lactose, peptone, and NaCl, then incubated at 37oC for 24 h. The bacteria culture was then added into the 10 g/L, 20 g/L, 30 g/L, 40 g/L, and 50 g/L glycerol media and then fermented for 24, 48, 72, and 6 h, then followed by centrifugated and solid phase was dried and weighed as a biomass. The filtrate was analyzed to determine the remaining glycerol. PHB was extracted from the biomass using chloroform, and then analyzed by FT-IR, H-NMR, C-NMR and viscometer. Monomer unit of the polymer was produced by esterification of the polymer then analyzed by GC.                Analysis generates that FT-IR, H-NMR, C-NMR, and GC shows the PHB can be synthesize from glycerol using Eschericia coli. PHB production is increasing if the time fermentation and initial glycerol concentration has been risen, with the maximum PHB produced is 92,73%. Molecular weight of PHB has maximum value if produced at initial glycerol concentration 40 g/L for 96 h. in the initial glycerol concentration 50 g/L, the molecular weight of PHB was reduced.

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