A rapid PCB-screening protocol, based on a combination of extraction techniques and instrumental nuclear activation analysis (INAA), required water soluble brominated internal standard that undergoes facile hydrolysis to a lipophilic brominated counterpart. Bromophenyl glucuronic acids 2, 3, 7 were synthesized for this application. Glucuronic acids 2 and 3 were prepared by bromination of phenyl β-D-glucopyranosiduronic acid in 81 and 54%, respectively, whereas compound 7 was prepared by coupling methyl 2,3,4-tri-O-acetyl-α-D-glucopyranosyluronate bromide (5) with 2,4,6-tribromophenol. Incubation with β-glucuronidase indicated that tribromophenyl derivative 7 is an excellent substrate, with near quantitative conversion to tribromophenol within seconds of incubation with the enzyme.
一个基于提取技术和仪器核活化分析(INAA)结合的快速PCB筛选协议,需要水溶性溴化内标,该内标易于水解为亲脂性溴化对应物。为此应用合成了溴苯基葡糖醛酸2、3、7。葡糖醛酸2和3分别通过溴化苯基β-D-葡萄糖吡喃醛酸制备,收率分别为81%和54%,而化合物7通过甲基2,3,4-三-O-乙酰-α-D-葡萄糖吡喃酸溴化物(5)与2,4,6-三溴苯酚偶联制备。与β-葡糖苷酶孵育表明,三溴苯基衍生物7是一个优秀的底物,在与酶孵育几秒钟后几乎完全转化为三溴苯酚。