Isolation of sophorose during sophorolipid production and studies of its stability in aqueous alkali: epimerisation of sophorose to 2-O-β- d -glucopyranosyl- d -mannose
作者:Ammar AL-Jasim、Mark Davis、Douglas Cossar、Timothy Miller、Paul Humphreys、Andrew P. Laws
DOI:10.1016/j.carres.2015.12.001
日期:2016.2
acetylated sophorose derivatives then undergo hydrolysis to release the parent disaccharide. Treatment of sophorose with aqueous alkali at elevated temperatures (0.1M NaOH at 50 °C) resulted in C2-epimerisation of the terminal reducing sugar and its conversion to the corresponding 2-O-β-D-glucopyranosyl-D-mannose which was isolated and characterised. In aqueous alkaline solution β-(1,2)-linked glycosidic
酵母念珠菌商业生产槐糖脂过程中产生的废物流的NMR和阴离子交换色谱分析确定存在少量但大量(1%w / v)的游离槐糖糖。槐糖,一种有价值的二糖,使用简单的提取程序从含水废物中分离出来,并通过在碳硅藻土柱上的色谱法进行纯化,从而易于获得大量的二糖。进行了实验以鉴定槐糖的来源,乙酰化的槐糖衍生物很可能是由酶催化的槐糖脂的糖基-脂质键水解产生的。乙酰化的槐糖衍生物然后水解以释放母体二糖。在高温下用碱水溶液处理槐糖(0。在50°C下用1M NaOH溶液)使末端还原糖进行C2异构化反应,并将其转化为相应的2-O-β-D-吡喃葡萄糖基-D-甘露糖,并进行了表征。在碱性水溶液中,β-(1,2)-连接的糖苷键不会发生水解或剥离反应。