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Process optimization for the production of sugar for the bioethanol industry from sorghum, a non-conventional source of starch

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Aggarwal, NK, Singh - Nee Nigam, Poonam, Singh, D and Yadav, BS (2001) Process optimization for the production of sugar for the bioethanol industry from sorghum, a non-conventional source of starch. WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY, 17 (4). pp. 411-415. [Journal article]

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Abstract

A commercial preparation of alpha -amylase, Biotempase, obtained from Biocon India Pvt. Ltd., and crude glucoamylase produced from Aspergillus sp. NA21 were used to hydrolyse sorghum powder, a non-conventional starchy substrate. Among various concentrations of starch (15-35%, dry weight/volume) tried for maximum liquefaction; slurry made with 25% substrate concentration proved optimal. An economical process of liquefaction was carried out using steam under pressure (0.2-0.3 bar, 104-105 degreesC) to liquefy a 25% slurry in just 45 min, contrary to a slower process carried out at 95 degreesC in a water bath. For liquefaction of starch a pH of 5.0 proved to be optimum. The dose of Biotempase as prescribed by the supplier could be reduced by 33% achieving the same degree of liquefaction, by addition of CaCl2 to the starch slurry at the concentration of 200 mg/l. The conditions for the saccharification of liquefied starch were optimized to be 45 degreesC and pH 5.0, producing 90% saccharification in 24 h. Supplementation of divalent ions Ca2+, Mg2+ and Zn2+ in the process of saccharification showed no effect. Finally glucose was found to be the main hydrolysis product in the saccharification of sorghum starch.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Biomedical Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Infection and Immunity/Microbiology
ID Code:5493
Deposited By:Dr Poonam Singh - Nee Nigam
Deposited On:21 Dec 2009 10:53
Last Modified:04 Aug 2011 09:48

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