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Structure dependent toxicity of lignin phenolics and PEG detoxification in VHG ethanol fermentation

机译：木质素酚酚类和PEG解毒在VHG乙醇发酵中的结构依赖性毒性

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The inhibition of lignin phenolics on fermenting microbes has become one of the major barriers in developing an economically viable process for cellulosic ethanol production. In this study, the toxicity to yeast cells and the inhibition to the very high gravity (VHG) fermentation of the phenolic compounds were investigated in the absence or presence of polyethylene glycol (PEG). It was found that the inhibitory effects of phenolic compounds on VHG ethanol fermentation depend on the activity of their hydroxyl (–OH) hydrogen. 250 g L ~(?1) PEG-1000 detoxified 2.0 g L ~(?1) guaiacol in the fermentation broth, and boosted the ethanol concentration from 131 g L ~(?1) to 173 g L ~(?1) . The inhibitory effect of 5.0 g L ~(?1) guaiacol on ethanol fermentation was also alleviated, and the ethanol concentration was increased from 51 g L ~(?1) to 151 g L ~(?1) after detoxification with 250 g L ~(?1) PEG-1000. The ~(1) H-NMR of hydroxyl group (–OH) of phenolic compounds in PEG revealed the role of hydrogen bonding formation on the in situ detoxification mechanism of PEG, and the order in the strength of the intermolecular hydrogen bond between phenolic compounds and PEG. Furthermore, the kinetics of VHG ethanol fermentation in the presence of phenolic compounds were determined. The obtained kinetic model (phenolic compounds inhibitory effect) fits well the kinetics of ethanol production from lignocellulosic hydrolyzates using batch VHG ethanol fermentation technology.
机译：抑制木质素酚类对发酵微生物的抑制已成为在发育纤维素乙醇生产的经济上可行的过程中的主要障碍之一。在该研究中，在不存在或存在的聚乙二醇（PEG）的情况下，研究了对酵母细胞的毒性和抑制酚类化合物的非常高的重力（VHG）发酵。发现酚类化合物对VHG乙醇发酵的抑制作用取决于其羟基（-OH）氢的活性。 250g l〜（α1）PEG-1000排毒2.0g L〜（α1）愈缩液中的愈缩液中的Guaiacol，并将乙醇浓度提升到131g l〜（α1）至173g l〜（α1）。减轻了5.0g L〜（α1）GuaiaCol对乙醇发酵的抑制作用，并且在用250g L的解毒后，乙醇浓度从51g l〜（Δ1）升至151g l〜（Δ1）。 〜（？1）PEG-1000。 PEG中酚类化合物的〜（1）H-NMR的羟基（-OH）揭示了氢键形成对PEG原位排出机理的作用，以及酚类化合物之间分子间氢键的强度的顺序和佩格。此外，测定VHG乙醇发酵的动力学。测定酚类化合物存在下。所获得的动力学模型（酚类化合物抑制作用）适合使用批量VHG乙醇发酵技术从木质纤维素水解产物的乙醇生产动力学。

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