Avaliação do potencial de produção de etanol e xilitol a partir de xilose por macromicetos

Abstract

Lignocellulosic biomass is primarily composed of cellulose, hemicellulose and lignin, whereinhemicellulose is about 30% of the lignocellulosic biomass and this fraction contains about 60% xylose. Currently studies are being conducted to take advantage of pentose from lignocellulosic hydrolysis.In this sense, it was evaluated the potential production of ethanol and xylitol from xylose, by the macromycetes Fomitella supine FS044/09, Pycnoporussanguineus PS451/10, Trametes elegans TE604/10, Trametes hirsute TH172/10, T. hirsute TH358/10, T. hirsute TH703/10, Trametes membranacea TM102/10, T. membranacea TM130/10, T.membranacea TM140/10, T. membranacea TM157/10, T membranacea TM158/10, T.membranacea TM397/10 and Trametes versicolor TV482/10. Randomly, it was selected a strain of each genus and evaluated the condition of aeration. The strain Trametes elegans TE604/10 showing a yield of 41.11% in the production of xylitol in anaerobic conditions, in contrast aerobic condition, the yield was 3.66%.The other two strains, F. supine FS044/09 and P. sanguineus PS451/10 also had higher yields for xylitol in anaerobic condition. It was ethanol production only by fungi of the genus Trametes. The highest yields of ethanol from xylose were obtained for the strain T. membranacea TM158/10, and 5.65 ± 0.21 g.L-1 in pH 4 to 28 ° C (288 h process time) and 5.59 ± 0.05 g.L1 pH5 to 24 ° C (360 h).When carried out the conversion of the sugars generated from the enzymatic hydrolysis of sugarcane bagasse there was higher yields from 74% to 15% for ethanol and xylitol, respectively. Although the production need to be optimized, this study showed the possibility of using T. membranacea mycelia for the simultaneous production of xylitol and ethanol from pentose sugars, opening the possibility of using new technology developments of the released sugars ligncelulósicos hydrolysis.