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The Effect of Different Ethoxylations for Sorbitan Monolaurate on Enhancing Simultaneous Saccharification and Fermentation (SSF) of Wheat Straw to Ethanol

Author:
Badawi, A. M., Fahmy, A. A., Mohamed, Karima A., Noor El-Din, M. R., Riad, M. G.
Source:
Applied biochemistry and biotechnology 2012 v.166 no.1 pp. 22-35
ISSN:
0273-2289
Subject:
Kluyveromyces marxianus, Saccharomyces cerevisiae, chemical structure, ethanol, ethanol production, ethylene oxide, fermentation, nonionic surfactants, nuclear magnetic resonance spectroscopy, saccharification, surface tension, wheat straw
Abstract:
In this paper, four nonionic surfactants with different hydrophilic–lipophilic balance (HLB) based on sorbitan monolaurate were synthesized by introducing ethylene oxide gas (n = 20, 40, 60, and 80 ethylene oxide units). The chemical structure of the prepared ethoxylated surfactants was confirmed using Fourier transform-infrared and 1H NMR spectroscopes. The surface tension and thermodynamic properties of the prepared surfactants have been studied. The simultaneous saccharification and fermentation (SSF) process for ethanol production from microwave/alkali pretreated wheat straw has been assayed using nonionic surfactants have different ethylene oxide units. Ethanol yield was 82% and 61% for Kluyveromyces marxianus and Saccharomyces cerevisiae, respectively, with the addition of 2.5 g/l of the prepared nonionic surfactant (HLB = 18.2). Results show that the production of ethanol from microwave/alkali pretreated wheat straw increased with increasing the (HLB) value of the nonionic surfactant.
Agid:
446337