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All Journal Reaktor Teknotan: Jurnal Industri Teknologi Pertanian Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Sosioteknologi Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences Journal of Industrial and Information Technology in Agriculture ASEAN Journal of Chemical Engineering Jurnal Teknik Kimia Indonesia Bulletin of Chemical Reaction Engineering & Catalysis
M.T.A.P. Kresnowati
Department Of Chemical Engineering, Faculty Of Industrial Engineering, Institut Teknologi Bandung, Ganesha 10, Bandung, 40132, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Effects of Microbial Starter Composition on Nutritional Contents and Pasting Properties of Fermented Cassava Flour M.T.A.P. Kresnowati; L. Turyanto; A. Zaenuddin; K. Trihatmoko
ASEAN Journal of Chemical Engineering Vol 19, No 1 (2019)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (588.367 KB) | DOI: 10.22146/ajche.50871

Abstract

Fermentation of cassava chips prior to drying and milling processes improves cassava flour quality: i.e. lower cyanogenic content, remove specific odour and colour. Composition of microbial starter applied to the fermentation may affect the microbial population during the fermentation and thus directs the process and the produced flour properties. This study mapped the effects of microbial starter composition on the microbial profiles during the fermentation and the corresponding nutritional contents as well as pasting properties of the produced fermented cassava flour (fercaf). Combinations of Lactobacillus plantarum, Bacillus subtilis and Aspergillus oryzae, that were selected based on their enzymatic activities, were evaluated. The addition of microbial starter was shown to affect the dynamics in microbial population during the fermentation. The addition of lactic acid bacteria accelerated the release of cyanogenic glycoside and starch conversion to simpler sugars, the addition of B. subtilis improved the disruption of cassava fibres, whereas the addition of A.oryzae was shown to increase the protein content of fercaf. The different microbial starter added to fermentation system also resulted in different pasting properties of fercaf. Microbial starter composition can be designed as such for the production of a particular flour property.
Modeling Syngas Fermentation for Ethanol Production under Fluctuating Inlet Gas Composition Istiqomah, Noviani Arifina; Mukti, Rendy; Kresnowati, Made Tri Ari Penia; Setiadi, Tjandra
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 2 Year 2025 (August 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20369

Abstract

Syngas fermentation effectively converts CO, H₂, and CO₂ into valuable biofuels and chemicals. This study investigated the effects of fluctuating syngas composition and kLa as the critical operational parameters on microbial fermentation performance, with a focus on ethanol, acetic acid, and biomass production. Modeling results demonstrated that increasing CO concentration significantly enhanced metabolite production, whereas increases in H₂ and CO₂ concentrations yielded limited improvements. The findings revealed that a higher H₂/CO ratio tent to reduce metabolite production, while a higher CO/CO₂ ratio significantly improved fermentation outcomes. Additionally, higher kLa values were observed to promote metabolite production, though diminishing returns were evident at very high kLa levels. Further study on the impact of syngas composition disturbances (±5% to ±20%) and fluctuation durations (0.5, 1, 2, and 4 days) indicated that larger disturbances and longer fluctuation durations led to greater deviations in metabolite concentrations, with ethanol being the most sensitive, followed by acetic acid and biomass. Despite these fluctuations, the microbial system displayed resilience, stabilizing once gas composition returned to normal levels. These insights underscored the adaptability and robustness of syngas fermentation systems, making them viable for industrial applications where gas composition variability is inevitable. The ability to tolerate moderate fluctuations offers opportunities to reduce gas pretreatment costs and process syngas from diverse sources, benefiting industries such as steel manufacturing, oil refining, and biomass gasification. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors A. R. Tanujaya A. Zaenuddin Abdul Aziz Afina Rahmani Andi Trirakhmadi Andry, Andry Ang, Elvina Angina Meitha Astri Nur Istyami Dewinka Anugeraheni Diah Meilany Diah Meilany Dianika Lestari Dianika Lestari Dianika Lestari Efri Mardawati Faradiva Dwinta Hana Nur Fitriana I.G.B Ngurah Makertihartha Ibnu Maulana Hidayatullah Istiqomah, Noviani Arifina K. Trihatmoko Khairul Hadi Burhan L. Turyanto Laras Cempaka Lestari, Dianika Liandro, Yessica Lienda Aliwarga Lienda Aliwarga Lienda Aliwarga Mukti, Rendy Mustofa Anshori Nicholaus Prasetya R Muhamad Jafar Rahmina, Fathya Ronny Purwadi Ronny Purwadi Rusdi, David Setiadi, Tjandra Silvia Oktavia Nur Yudiastuti Subiantoro Subiantoro Susanto Purwo Susi Zukriwati Tantra, Tan Mellisa Tatang Hernas Soerawidjaja Tirto Prakoso Vita Wonoputri Wijaya, Andy Wiranata Yasid Bindar Yazid Bindar Yazid Bindar Yazid Bindar Yazid Bindar