Suitability of Sorghum bicolor L. stalks and grains for bioproduction of ethanol
2011
Massoud, M.I. | Abd El-Razek, A.M.
The goal of this proposed research is to utilize each of stalks juice, the acid hydroIysate of both Iignocellulosic components of the juice extracted stalks and grains of non food sweet sorghum crop as a carbon source during bioproduction of ethanol using Saccharomyces cerevisiae and simultaneous saccharitication fermentation (SSF) process. The obtained results revealed variation in proximate composition of carbohydrate compounds and minerals content between the sweet sorghum crop parts used in this study . The acid hydrolysis of the lignoccllulosic components of stalks led to hydrolyse 11, 18° of cellulose, 76.91°/M,f hemicelIuloses and 24.27% of lignin It was also converted 67°/aof the starch in the grains into reducing sugars. Alter 72 hr of ternientation, the medium containing starch grains hydrolysatc gave the highest ethanol production (23.93g/I) with yield of 0.50g alcohol per g sugar and fermentation efficiency of 97.39% comparing with other two mediums having stalks juice and stalks hydrolysatc (SII) as carbon sources. Also the yeasts in this medium consumed highest amount of sugars and gave the highest biomass yield followed by that containing stAks h;::clysste. Waste water which was remained after recovering of ethanol and removing the biomass liom the fermentation medium had considerable levels of potassium , sodium , Mg, Ca, Fe, Cu ,:i:d Mn and can be recommended for use in plant irrigation.
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