title: [Identification of concentration and brand for products using differential gel permeation chromatography].
abstract: In differential gel permeation chromatographic method (D-GPC), a standard solution and an analyzed solution are used as the eluent and injected solution, respectively. It can determine the minute differences between them. When the analyzed solution and the standard solution are identical, a null signal is given, otherwise the nonzero signal tells the detailed differences between them. Two examples, the concentration identification of five polyethylene glycol 200 (PEG200) solutions and the brand identification of three brands of beers, are given to show the application of the D-GPC method. The potential applications of the D-GPC method in quality control and the identification of counterfeit products are also discussed.
authors.affiliation: College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, China. w_qingguo@hotmail.com
authors.forename: Qingguo
authors.initials: Q
authors.lastname: Wang
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Lixing
authors.initials: L
authors.lastname: Cai
authors.forename: Rongshi
authors.initials: R
authors.lastname: Cheng