title: Fluorescence enhancement effect for the determination of proteins with morin-Al3+ -cetyltrimethylammonium bromide.
abstract: It is found that the fluorescence intensity of morin-Al(3+) complex can be greatly enhanced by proteins in the presence of cetyltrimethylammonium bromide (CTAB). It is considered that protein and CTAB provide a hydrophobic environment with low polarity and large viscosity, resulting in the fluorescence enhancement of morin-Al(3+) complex. The experiments indicate that under optimum conditions, the enhanced intensity of fluorescence is in proportion to the concentration of proteins (such as bovine serum albumin (BSA), human serum albumin (HSA) and egg albumin (EA)) in the wide range, and their detection limits (S/N=3) are 2.6 x 10(-9), 1.4 x 10(-8) and 1.6 x 10(-8) g ml(-1), respectively. This method has satisfactorily been used for the determination of protein in actual sample. In comparison with most of fluorimetric methods reported, this method is quick and simple, and has high sensitivity, wide linear range and good stability.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.forename: Jinghe
authors.initials: J
authors.lastname: Yang
authors.forename: Xia
authors.initials: X
authors.lastname: Wu
authors.forename: Changxia
authors.initials: C
authors.lastname: Sun
authors.forename: Shufang
authors.initials: S
authors.lastname: Liu
authors.forename: Changying
authors.initials: C
authors.lastname: Guo
authors.forename: Feng
authors.initials: F
authors.lastname: Wang