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Study on inhibitors from acid pretreatment of corn stalk on ethanol fermentation by alcohol yeast

机译：玉米秸秆酸预处理对醇酵母乙醇发酵的抑制剂研究

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The inhibitory effects of the main inhibitors formed during acid pretreatment of corn stalk were studied through ethanol fermentations of model substrates and hydrolysates from corn stalk by alcohol yeast. Experimental results showed that the tested inhibitors had no significant effect on ethanol fermentations when they were added separately at a concentration according to analysis results from hydrolysate of corn stalk. However, when they were added as a mixture, the inhibitory effects became obvious. With the increase of concentration, there was a delay in ethanol productivity. But complete inhibition was observed at 5.0 g L ~(?1) furfural, 10.0 g L ~(?1) acetic acid, 7.0 g L ~(?1) ferulic acid, and 7.0 g L ~(?1) p -coumaric acid, respectively. The inhibitory effect decreased in the order: furfural > acetic acid > ferulic acid > p -coumaric acid > HMF. These results suggest that a high concentration of inhibitor has a strong negative influence on ethanol fermentation, but the inhibiting abilities of various inhibitors are different.
机译：通过乙醇发酵在玉米秸秆的酸预处理期间形成的主要抑制剂的抑制作用通过乙醇的底物和玉米秸秆的水解产物进行醇酵母。实验结果表明，当玉米秸秆水解产物的水解产物分析结果分别加入浓度时，测试抑制剂对乙醇发酵没有显着影响。然而，当它们作为混合物添加时，抑制作用显而易见。随着浓度的增加，乙醇生产率延迟。但在5.0g l〜（α1）糠醛下观察到完全抑制，10.0g l〜（α1）乙酸，7.0g l〜（α1）阿魏酸，7.0g l〜（α1）p -coumaric酸分别。抑制效果按顺序减少：糠醛>乙酸>阿魏酸> P-COUMARIC酸> HMF。这些结果表明，高浓度的抑制剂对乙醇发酵具有强烈的负面影响，但各种抑制剂的抑制能力是不同的。

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