Ethanol production by Saccharomyces cerevisiae immobilized on stem ground tissue of different maize hybrids | Proizvodnja bioetanola pomoću Saccharomyces cerevisiae imobilisanih na stabljikama različitih hibrida kukuruza
2009
Vučurović, V., Tehnološki fakultet, Novi Sad (Serbia) | Razmovski, R., Tehnološki fakultet, Novi Sad (Serbia) | Bekavac, G., Institut za ratarstvo i povrtarstvo, Novi Sad (Serbia)
The maize stem is a low in cost, environmentally friendly, sustainable and abundantly available lignocellulosic raw material in many regions of the world. The maize stem ground tissue is a highly porous biomaterial, consisted of parenchyma cells, with honeycomb microstructure, enabling efficient yeast cells immobilization and alcoholic fermentation without significant mass transfer limitation. The aim of this paper was to study the influence of the addition of stem ground tissue from six maize hybrids as Saccharomyces cerevisiae cells support: NS 444, NS 3014, NS 5043, NS 6010, NS 6030, NS 7016 on the dynamic of alcoholic fermentation, ethanol yield, ethanol productivity, and molasses sugar conversion rate. Acid or alkaline nature and hydrophilicity of stem ground tissue is different for each hybrid. Depending on the maize hybrid, addition of 10 g/cubic dm of stem ground tissue led to an increase in ethanol yield by 4.89-9.94 g/cubic dm, and increase of sugar conversion by 7.65-15.56%. Addition of 10 g of maize stem ground tissue decreased the total fermentation time by 10 h, regardless of the hybrid. Among all hybrids tested, the most efficient in improving the ethanol productivity was NS 3014.
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