A pseudo-esterase activity -based fluorescent probe for specific detection of albumin and its applications. This probe is based on human serum albumin's pseudo-esterase activity, that is to say, under the condition of physiological pH value, the carboxylic ester bond of the probe (λex = 342 nm, λem = 416 nm) could be selectively cleaved by human serum albumin (HSA) to release the 4-hydroxy-1,8-naphthalimide fluorophore, while the dibenzoyl group covalently bound to the amino acid residues of HSA. The fluorescence emission spectrum of the product is significantly different from that of the substrate molecule (λex = 452 nm, λem = 564 nm), and according to the fluorescence intensity of substrate and product we can detect the content of HSA in the system. This probe can be used for the determination of the absolute content of albumin in biological samples with the advantage of high accuracy, sensitivity, little influence from the environment and it is compatible with a variety of endogenous substances, exogenous drugs, and surfactant and so on.
一种基于假
酯酶活性的荧光探针,用于特异性检测白蛋白及其应用。该探针基于人
血清白蛋白的假
酯酶活性,即在生理 pH 值条件下,探针的
羧酸酯键(λex = 342 nm,λem = 416 nm)可被人
血清白蛋白(H
SA)选择性裂解,释放出
4-羟基-1,8-
萘二甲
酰亚胺荧光团,而二苯甲酰基则与 H
SA 的
氨基酸残基共价结合。产物的荧光发射光谱与底物分子的荧光发射光谱(λex = 452 nm,λem = 564 nm)明显不同,根据底物和产物的荧光强度,我们可以检测出体系中 H
SA 的含量。该探针可用于测定
生物样品中白蛋白的绝对含量,具有准确度高、灵敏度高、受环境影响小、与多种内源性物质、外源性药物和表面活性剂等兼容等优点。