Selective N-acylation of aminoglycoside antibiotics with the N-hydroxysuccinimide ester of methyldithioacetic acid, followed by reaction with methanethiol or dithioerythritol, gives sulfhydryl labeled antibiotics. Alternatively, the nucleophilic sulfhydryl group is incorporated into an antibiotic by treatment with N-acetyl-d,l-homocysteine thiolactone. These derivatives couple readily with proteins that have previously been modified with bromoacetylglycyl groups to provide conjugates for use in the development of homogeneous enzyme immunoassays.
氨基糖苷抗生素的选择性N-酰化,使用甲基二硫乙酸的N-羟基琥珀酰亚胺酯,随后与甲硫醇或二硫巴比妥醇反应,可制备含硫巯基标记的抗生素。或者,通过与N-乙酰-d,l-同型半胱氨酸硫内酯处理,将亲核硫巯基基团引入抗生素中。这些衍生物可与之前用溴乙酰甘氨酰基修饰过的蛋白质轻松偶联,用于开发均相酶免疫分析的共轭物。