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All Journal Indonesian Journal of Biotechnology Kelimutu Journal of Community Service
Jasman Jasman
Biotechnology Study Program, Universitas Gadjah Mada Science Education Department, Universitas Nusa Cendana
Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology Materials Science & Nanotechnology Social Sciences Other

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Ethanol Fermentation on Mixed Sugars Using Mixed Culture of Two Yeast Strains J. Jasman; Irfan Dwidya Prijambada; Chusnul Hidayat; Donny Widianto
Indonesian Journal of Biotechnology Vol 18, No 2 (2013)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (162.484 KB) | DOI: 10.22146/ijbiotech.7880

Abstract

The objective of this study was to evaluate the use of mixed cultures of the recommended yeast strainsfrom a previous study on ethanol fermentation using a substrate mixture consisting of sucrose, glucose, andfructose. There were three mixed (combination) cultures namely OUT7096/OUT7913, OUT7096/OUT7921,and OUT7913/OUT7921. The fermentation medium contained sugar mixture consisting of glucose, fructose,and sucrose with a composition generally close to the composition of sugars in sweet sorghum juice. Overall,fermentation is carried out in two stages. First fermentation was performed using the three mixed culturesto determine the best combination based on the concentration of ethanol produced and the concentration ofresidual sugar. Second fermentation was conducted using the best mixed culture obtained from the fi rst stage.This second stage was intended to describe the pattern of the changes in the concentration of ethanol, sugarsand biomass during the fermentation progresses and to determine some kinetic parameters namely ethanolyield (Yp/s), growth yield (Yx/s) and specifi c growth rate (μ). The results of the fi rst fermentation showed thatthe best mixed culture was OUT7913/OUT7921 and the subsequent fermentation using this culture providethe highest ethanol yield (Yp/s) = 0.47 g.g-1 that was reached at 53rd hour, growth yield (Yx/s) = 0.425 g.g-1, andμ = 0.12 hour-1.Keywords : fermentation, ethanol, mixed culture, mixed sugar
Selection of Yeast Strains for Ethanol Fermentation of Glucose-FructoseSucrose Mixture J. Jasman; Irfan Dwidya Prijambada; Chusnul Hidayat; Donny Widianto
Indonesian Journal of Biotechnology Vol 17, No 2 (2012)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijbiotech.16001

Abstract

This study was aimed to compare the ability of some yeast strains to consume sugars (sucrose, glucoseand fructose) and to convert them into ethanol during fermentation. The results of this comparison will be thebasis of considerations in choosing the right strain to be used as a mixed culture to increase the productionof ethanol from substrate containing a mixture of sucrose, glucose and fructose, such as juice of cane andsweet sorghum. The study was conducted using fermentation in substrate consisting of glucose, fructose,and sucrose separately, glucose-fructose mixture, and glucose-fructose-sucrose mixture using some yeaststrains: FNCC3012, OUT7009, OUT7027, OUT7055, OUT7080, OUT7096, OUT7903, OUT7913, and OUT7921.Following the fermentation, analysis of the produced ethanol and the remaining sugar was conducted. Theresults of study indicated that the strains with the highest substrate consumption were OUT7921, OUT7096,OUT7055, OUT7027, and OUT7913 for glucose, fructose, glucose-fructose mixture, sucrose, and glucosefructose-sucrose mixture, respectively. Strains that produced highest concentration ethanol were OUT7096 inglucose and sucrose substrates, OUT7921 in substrate of glucose-fructose mixture and sucrose, OUT7913 insubstrate of glucose-fructose-sucrose mixture. Upon consideration of each strain capacity, both in consumingsugar and producing ethanol, the recommended strains for use in mixed culture in bioethanol fermentationusing mixed substrate of glucose, fructose and sucrose are OUT7096, OUT7913, and OUT7921.
Pelatihan Visualisasi Molekul Kimia dengan Software Chemsketch bagi Peserta didik SMA di Kota Kupang NTT Sudirman Sudirman; Jasman .; I Gusti M.N. Budiana; Dewi Lestarani; Eka Citra G. Kerihi; Yusnaeni .
Jurnal Kelimutu Pengabdian Masyarakat Vol 3 No 1 (2023): Mei
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/kjcs.v3i1.11211

Abstract

The problems in learning chemistry faced by teachers at school include: (1) how to visualize chemical molecular structures that are still manual, namely drawing on whiteboards or sometimes with the Microsoft Word program which is familiar to most students will give results that are not in accordance with the rules of writing symbols; (2) the aspect of the teacher's and students' lack of insight regarding the Chemsketch software for drawing chemical molecular structures; and (3) aspects of students' enthusiasm and interest in self-development which are still limited. Of all the problems faced by partners, the solution offered is a Chemical Molecule Visualization Training activity with Chemsketch Software for High School Students in Kupang City, NTT. With this training, students are expected to have knowledge and skills in using Chemsketch Software in drawing chemical molecular structures and attracting students' learning interest and arousing students' curiosity through observing the material displayed through visualization of chemical molecular shapes.
Co-Authors Chusnul Hidayat Chusnul Hidayat Donny Widianto Donny Widianto Eka Citra G. Kerihi I Gusti M.N. Budiana Irfan Dwidya Prijambada Irfan Dwidya Prijambada Lestarani, Dewi Sudirman Sudirman Yusnaeni .