期刊
BIORESOURCE TECHNOLOGY
卷 133, 期 -, 页码 522-528出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.01.175
关键词
Maize stem; Fractionation; Lignins; Endoglucanase; Lignocellulose
资金
- Foundation of Emil Aaltonen
- Finnish Foundation for Technology Promotion
Sequential fractionation of extractive-free maize stems was carried out using two mild alkaline extractions (0.5 and 2 M NaOH, 20 degrees C, 24 h) before and after endoglucanase treatment. This procedure provided two lignin-carbohydrate fractions (LC1 and LC2) recovered after each alkali treatment. LC1 and LC2 contained 39% and 8% of the total lignin amount, respectively. These two fractions contained structurally distinct lignin molecules. While the content of resistant interunit bonds in lignin was 77% in LC1, it was increased up to 98% in LC2. Not unexpectedly, both alkali-soluble fractions contained substantial amount of p-coumaric and ferulic acids ether-linked to lignins. These results outline heterogeneity of maize stem lignins related to fractionation of grass materials. (C) 2013 Elsevier Ltd. All rights reserved.
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