采用酶法对大分子量的白籽仁多糖(Polysaccharide of endosperm of Gleditsia japonica var. delavayi seeds,EGSP)进行降解,得到一种低分子量白籽仁多糖(Low molecular-weight EGSP,L-EGSP)。结合气相色谱、甲基化分析、红外及核磁共...采用酶法对大分子量的白籽仁多糖(Polysaccharide of endosperm of Gleditsia japonica var. delavayi seeds,EGSP)进行降解,得到一种低分子量白籽仁多糖(Low molecular-weight EGSP,L-EGSP)。结合气相色谱、甲基化分析、红外及核磁共振等方法对L-EGSP的精细结构进行了研究。结果显示L-EGSP相对分子质量约为4.3kDa,主要由甘露糖和半乳糖组成,甘露糖/半乳糖=1.93∶1;甲基化结果表明,L-EGSP的主链由甘露糖通过β-1,4-糖苷键连接,部分主链甘露糖的C_6位置被半乳糖取代,以α-1,6-糖苷键相连,形成侧链;精细结构的计算结果显示,L-EGSP的结构中存在两个半乳糖连续取代的非平滑区域。L-EGSP分子结构的测定为探索多糖的结构-活性关系奠定了基础,有助于指导功能性天然多糖的有效筛选。展开更多
Antioxidant activity of the peptides derived from proteins of defatted cottonseed kernels and cotton ground oil-cake by their enzymatic hydrolysis with acidic （Asp. niger） and neutral proteinases （Bac. amyloliquefa...Antioxidant activity of the peptides derived from proteins of defatted cottonseed kernels and cotton ground oil-cake by their enzymatic hydrolysis with acidic （Asp. niger） and neutral proteinases （Bac. amyloliquefaciens） was studied. Antioxidant activity of the derived peptides depended on the used proteins and enzymes. The peptides derived by using of neutral proteinase possessed higher antioxidant activity, in comparison with the peptides derived by acidic proteinases.展开更多
文摘采用酶法对大分子量的白籽仁多糖(Polysaccharide of endosperm of Gleditsia japonica var. delavayi seeds,EGSP)进行降解,得到一种低分子量白籽仁多糖(Low molecular-weight EGSP,L-EGSP)。结合气相色谱、甲基化分析、红外及核磁共振等方法对L-EGSP的精细结构进行了研究。结果显示L-EGSP相对分子质量约为4.3kDa,主要由甘露糖和半乳糖组成,甘露糖/半乳糖=1.93∶1;甲基化结果表明,L-EGSP的主链由甘露糖通过β-1,4-糖苷键连接,部分主链甘露糖的C_6位置被半乳糖取代,以α-1,6-糖苷键相连,形成侧链;精细结构的计算结果显示,L-EGSP的结构中存在两个半乳糖连续取代的非平滑区域。L-EGSP分子结构的测定为探索多糖的结构-活性关系奠定了基础,有助于指导功能性天然多糖的有效筛选。
文摘Antioxidant activity of the peptides derived from proteins of defatted cottonseed kernels and cotton ground oil-cake by their enzymatic hydrolysis with acidic （Asp. niger） and neutral proteinases （Bac. amyloliquefaciens） was studied. Antioxidant activity of the derived peptides depended on the used proteins and enzymes. The peptides derived by using of neutral proteinase possessed higher antioxidant activity, in comparison with the peptides derived by acidic proteinases.
