Exiguobacterium sp. VSG-1 was isolated from the soil sample and characterized for the production of lignocellulolytic enzymes. Production of these enzymes by the strain VSG-1 was carried out using steam-exploded sugarcane bagasse (SCB) and found to secrete cellulase, pectinase, mannanase, xylanase, and tannase. The growth and enzyme production were found to be optimum at pH 9.0 and 37 °C. Upon steam explosion of SCB, the cellulose increased by 42 %, whereas hemicelluloses and lignin decreased by 40 and 62 %, respectively. Enzymatic hydrolysis of steam-exploded SCB yielded 640 g/l of total sugars. Fermentation of sugars produced from pretreated SCB was carried out by using Saccharomyces cerevisiae at pH 5.0 and 30 °C. The alcohol produced was calculated and found to be 62.24 g/l corresponding to 78 % of the theoretical yield of ethanol. Hence, the strain VSG-1 has an industrial importance for the production of fermentable sugars for biofuels.

译文

从土壤样品中分离出VSG-1,并表征其产生木质纤维素分解酶。使用蒸汽分解的甘蔗渣 (SCB) 通过菌株VSG-1生产这些酶,发现它们分泌纤维素酶,果胶酶,甘露聚糖酶,木聚糖酶和鞣酸酶。发现生长和酶产生在pH 9.0和37 °C下是最佳的。在蒸汽爆炸SCB时,纤维素增加了42%,而半纤维素和木质素分别减少了40和62%。蒸汽分解SCB的酶促水解产生640g/l的总糖。通过使用酿酒酵母在pH 5.0和30 °C下进行由预处理的SCB产生的糖的发酵。计算产生的醇,发现为62.24g/l,对应于乙醇理论产率的78%。因此,该菌株VSG-1在生产用于生物燃料的可发酵糖方面具有工业重要性。

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