作者:Rajachristu Einstein CHARLES、Soundar DIVAKAR
DOI:10.1271/bbb.80463
日期:2009.1.23
Enzymatic syntheses of pyridoxine glycosides were carried out in di-isopropyl ether organic medium using β-glucosidase isolated from sweet almond. Optimum conditions determined for the reaction with d-glucose were 40% (w/w d-glucose) β-glucosidase at 0.18 mm (1.8 ml) of pH 5 acetate buffer over a 72 h incubation period. Of 11 carbohydrates employed, β-glucosidase gave 7-O-(α-d-glucopyranosyl)pyridoxine 5a, 7-O-(β-d-glucopyranosyl)pyridoxine 5b, 6-O-(α-d-glucopyranosyl)pyridoxine 5c, 7-O-(α-d-galactopyranosyl)pyridoxine 6a, 7-O-(β-d-galactopyranosyl)pyridoxine 6b, 6-O-(α-d-galactopyranosyl)pyridoxine 6c, 7-O-(α-d-mannopyranosyl)pyridoxine 7a, 7-O-(β-d-mannopyranosyl)pyridoxine 7b, and 6-O-(α-d-mannopyranosyl)pyridoxine 7c in yields ranging from 23 to 40%.
在二异丙基醚有机介质中,使用从甜杏仁中分离的β-葡萄糖苷酶进行了维生素B6糖苷的酶促合成。通过实验确定与d-葡萄糖反应的最佳条件是:使用40%(w/w d-葡萄糖)的β-葡萄糖苷酶,在0.18 mm(1.8 ml)pH 5的乙酸盐缓冲液中孵育72小时。
在使用的11种糖类中,β-葡萄糖苷酶产生了以下产物:
- 7-O-(α-d-吡喃葡萄糖基)维生素B6 5a
- 7-O-(β-d-吡喃葡萄糖基)维生素B6 5b
- 6-O-(α-d-吡喃葡萄糖基)维生素B6 5c
- 7-O-(α-d-吡喃半乳糖基)维生素B6 6a
- 7-O-(β-d-吡喃半乳糖基)维生素B6 6b
- 6-O-(α-d-吡喃半乳糖基)维生素B6 6c
- 7-O-(α-d-吡喃甘露糖基)维生素B6 7a
- 7-O-(β-d-吡喃甘露糖基)维生素B6 7b
- 6-O-(α-d-吡喃甘露糖基)维生素B6 7c
产率范围在23%到40%之间。