title: An improved procedure for determination of the mean aggregation number of micelles.
abstract: In this paper, a theory of fluorescence quenching in micelles which enables a dynamic approach to the evaluation of the aggregation numbers of micelles is presented. This method is based on a detailed kinetic model of quenching of fluorescent probe developed by Tachiya (1975, 1982) and takes into account that a part of quenchers are associated with micelles but the remaining quenchers are in the aqueous phase. The approach presented is an improvement on a previous fluorescence quenching method (Turro and Yekta, 1978) and is applied to determine the aggregation number of sodium dodecyl sulfonate (SAS) in aqueous dipeptide solution using cetylpyridinium chloride as quencher. The values of aggregation number and association constant for quencher-micelle association are presented.
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450052, PR China.
authors.forename: Shuangyan
authors.initials: S
authors.lastname: Wu
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Tachiya
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450052, PR China. Electronic address: yanzzn@zzu.edu.cn.
authors.forename: Zhenning
authors.initials: Z
authors.lastname: Yan
mesh_terms: D008823:Micelles; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D012996:Solutions; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D008823:Micelles; D012996:Solutions; D014867:Water; D012967:Sodium Dodecyl Sulfate
keywords: Aggregation number; Fluorescence quenching method; Sodium dodecyl sulfonate