title: Preparation of quaternized cellulose/chitosan microspheres for selective enrichment of phosphopeptides.
abstract: As one of the most important posttranslational modifications, protein phosphorylation plays an important role in vital movement. However, an efficiency enrichment treatment prior to MS detection is still a crucial step to protein phosphorylation analysis. In this work, a novel hybrid microsphere for efficient phosphopeptide enrichment was prepared by reverse-phase suspension polymerization of cellulose derivative and chitosan. The microspheres bore different kinds of amine groups and the main enrichment mechanism was based on anion exchange. This approach exhibited high selectivity for phosphopeptides from β-casein, α-casein, and non-fat milk. Three phosphopeptides could still be detected when the amount of β-casein was as low as 10 fmol. This study demonstrated a new attractive solid-phase support for phosphopeptide enrichment to meet the increasing need of phosphoproteomics analysis.
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei, 430072, China.
authors.forename: Lili
authors.initials: L
authors.lastname: Dai
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei, 430072, China.
authors.forename: Shanxia
authors.initials: S
authors.lastname: Jin
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei, 430072, China.
authors.forename: Mengying
authors.initials: M
authors.lastname: Fan
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei, 430072, China. zbping@whu.edu.cn.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhou
mesh_terms: D000818:Animals; D002482:Cellulose / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D008892:Milk / Q000737:chemistry; D015394:Molecular Structure; D010748:Phosphopeptides / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D010748:Phosphopeptides; D002482:Cellulose; D048271:Chitosan
keywords: Cellulose; Chitosan; Mass spectrometry; Phosphopeptide; Quaternization