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氧化还原电位调控混合糖为底物的丁醇发酵

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Indexed by:期刊论文

Date of Publication:2014-01-15

Journal:化工学报

Included Journals:EI、PKU、ISTIC、CSCD、Scopus

Volume:65

Issue:6

Page Number:2225-2231

ISSN No.:0438-1157

Key Words:生物燃料;丁醇发酵;生物过程;氧化还原电位调控;丙酮丁醇梭菌

Abstract:控制丁醇发酵过程中的氧化还原电位(oxidoreduction potential, ORP)能够大幅提高丁醇产量和果糖利用率,并降低终点有机酸浓度。实验考察了以葡萄糖和果糖混合糖为底物,通过泵入无菌空气控制ORP分别不低于-490、-460、-430及-400 mV丁醇发酵情况。其中,控制ORP不低于-460 mV时,丁醇和总溶剂产量分别达到13.19 g·L-1及19.71 g·L-1,相对于不控制ORP的丁醇自然发酵分别提高了139.38%及117.07%,残糖浓度降低至3.20 g·L-1,糖利用率高达94.18%。该调控策略有效地解决了以葡萄糖和果糖混合糖为底物的丁醇发酵过程中存在的残糖浓度高、丁醇产量低的问题。

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