Chem. J. Chinese Universities ›› 2014, Vol. 35 ›› Issue (10): 2073.doi: 10.7503/cjcu20140659

• Analytical Chemistry • Previous Articles     Next Articles

Novel Method Coupled TiO2 with Ultrafiltration Membrane to Enrich and Separate Phosphopeptides and Sialic Acid-containing Glycopeptides from Saliva of Cancer Patient

LI Juan, JIANG Wuhui, XU Xiaoying*()   

  1. The Second Affiliated Hospitals of Dalian Medical University, Dalian 116023, China
  • Received:2014-07-16 Online:2014-10-10 Published:2014-09-30
  • Contact: XU Xiaoying E-mail:xiaoyingxu73@aliyun.com
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.81171486)

Abstract:

A novel method coupled TiO2 with ultrafiltration membrane was established to enrich and separate phosphopeptides and N-linked glycopeptides. Firstly, the 10K cutoff ultrafiltration membrane was chosen for separating phosphopeptides and glycopeptides. Then, TiO2 enrichment and ultrafiltration membrane separation of PTM-peptides were tested with tryptic digests of α-casein and bovine fetuin. The limit of detection of the developed method was measured as 0.16 pmol with standard phosphopeptide. At last, the established method was applied to enrich and separate phosphopeptides and glycopeptides from saliva of lung cancer. A total of 8 phosphopeptides and 5 glycopeptides could be successfully identified with nano ultra-high pressure liquid chromatography-quadrupole-time of flight MS(Nano UPLC Q-TOF). This method significantly improved the sensitivity and efficiency and could be contributed to novel disease biomarker discovery.

Key words: TiO2, Enrichment, Ultrafiltration Membrane, Phosphopeptide, Glycopeptide

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