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Πέμπτη 29 Μαρτίου 2018

Effect of clarification pH of sorghum juice on the composition of essential nutrients for fermentation

Abstract
The growing demand to replace fossil fuels with renewable alternatives has generated an urgent and imminent global need to find new non-fossil sources. Sweet sorghum is widely recognized as a highly promising biomass energy crop with particular potential to complement sugarcane for ethanol production. Our aim in this study was to evaluate the influence of pH during the clarification method on the composition of essential nutrients in the sorghum juice and how this affects the efficiency of the ethanol fermentation process. We found that a higher pH directly affected residual concentrations of key nutrients (P, Ca, Zn, Mn) and as a consequence the efficiency of ethanol fermentation. In conclusion we recommend a clarification procedure at pH 6–6.5 in order not to significantly affect nutritional parameters important for the yeast fermentation process.

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