本文選題：葵花籽殼 + 醋酸法�。� 參考：《食品科學(xué)》2017年07期

【摘要】：以葵花籽殼為原料,采用醋酸法提取木質(zhì)素,并利用凝膠滲透色譜、紫外光譜、傅里葉變換紅外光譜、核磁共振氫譜和熱重分析對提取的木質(zhì)素進(jìn)行結(jié)構(gòu)表征,并對提取木質(zhì)素的抗氧化活性進(jìn)行評價。結(jié)果表明:醋酸法木質(zhì)素提取率為70.12%(相對于Klason木質(zhì)素),純度達(dá)到88.54%,結(jié)合少量的碳水化合物(2.92%)�？ㄗ褮つ举|(zhì)素為GS型木質(zhì)素,含有較高的愈創(chuàng)木基結(jié)構(gòu)單元(G),結(jié)構(gòu)單元之間的連接鍵以β-O-4結(jié)構(gòu)為主,重均分子質(zhì)量(M_w)、數(shù)均分子質(zhì)量(M_n)和多分散度(M_w/M_n)分別為2 977、1 931 D和1.54�？ㄗ褮ご姿崽崛〉哪举|(zhì)素主要降解溫度在200~400℃之間,最大失質(zhì)量速率為0.32%/℃�？寡趸钚匝芯勘砻�,木質(zhì)素清除1,1-二苯基-2-三硝基苯肼自由基指數(shù)值為1.54,顯著高于商業(yè)合成抗氧化劑二丁基羥基甲苯(0.94),具有很好地應(yīng)用于食品及其他工業(yè)做抗氧化劑的前景。
[Abstract]:The lignin extracted from sunflower seed shell was extracted by acetic acid method. The structure of lignin was characterized by gel permeation chromatography, ultraviolet spectrum, Fourier transform infrared spectroscopy, nuclear magnetic resonance (NMR) and thermogravimetric analysis (TGA). The antioxidant activity of extracted lignin was evaluated. The results showed that the extraction rate of lignin by acetic acid method was 70.12 (relative to Klason lignin, the purity was 88.54 and a small amount of carbohydrate was combined with 2.92%). Sunflower husk lignin is GS type lignin, which contains a high guaiac-based structure unit, and the connecting bonds between the structural units are mainly 尾 -O-4 structure. The weight average molecular weight (WMW) and the number average molecular weight (MN) and the polydispersity of MW / M _ (n) are 2997 1 931 D and 1. 54 respectively. The main degradation temperature of lignin extracted by acetic acid from sunflower seed shell was between 200 鈩，

本文編號：1870576