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机构地区:[1]宁夏大学能源化工重点实验室,宁夏银川750021
出 处:《宁夏大学学报(自然科学版)》2010年第1期74-77,82,共5页Journal of Ningxia University(Natural Science Edition)
基 金:国家自然科学基金资助项目(20564002)
摘 要:通过研究氨苄西林、6-氨基青霉烷酸(6-APA)和D-苯甘氨酸甲酯(D-PGME)在聚乙二醇(PEG)和不同盐组成的双水相体系(ATPS)中的分配行为,建立了一个由PEG-4000(w=20%)和硫酸铵(w=15%)组成的双水相体系.在此体系中,氨苄西林的分配系数为5.0,6-APA和D-PGME的分配系数分别为1.7和1.4.以环氧基功能化介孔分子筛SBA-15为载体固定青霉素酰化酶(Penicillin G Acylase,PGA),并在双水相体系中催化合成氨苄西林,产率为80%,经过4批次的连续合成,产率提高到98%,而在水相体系中酶促合成氨苄西林的产率仅为27%.An aqueous two-phase system (ATPS) which consists of PEG-4000 (w= 20%) and ammonium sulfate (w= 15%) was developed by examining the partitioning behaviours of ampicillin, 6-aminopenicillanic acid (6-APA) and D-(-)-alpha-phenylglycine methyl ester (D-PGME) in poly (ethylene glycol) (PEG)/salt ATPS. In this system, the partition coefficients of ampicillin, 6-APA and D-PGME were 5.0, 1.7 and 1.4, respectively. Epoxy-functionalized mesoporous sieve (G-SBA-15) was prepared for the covalent immobilization of penicillin G acylase (PGA). The immobilized PGA was used for the enzymatic synthesis of ampicillin in aqueous two-phase system of PEG-4000 (w = 20 %) ammonium sulfate (w = 15 %) and a high yield (80 % ) was achieved compared with the yield (27 %) in aqueous system. Ampicillin yield was rised up to 98 % after 4 batches sequential bioconversion in the aqueous two-phase system.
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