Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1776.doi: 10.7503/cjcu20200671

• Chemical Biology • Previous Articles     Next Articles

Ultraviolet Absorbance of Saturated Structure in the Non-reducing End of Heparin/Heparan Sulfate Disaccharides and Its Application in Sequence of Heparin Oligosaccharides

LIANG Quntao1, ZOU Qiang3, LIN Jianghui2, LIU Shutao1, WEI Zheng2()   

  1. 1.College of Biological Science and Engineering,Fuzhou University,Fuzhou 350108,China
    2.Institute of Glycobiochemistry,National Engineering Research Centre of Chemical Fertilizer Catalyst,Fuzhou University 350002,China
    3.Comprehensive Technical Service Center of Quanzhou Customs,Quanzhou 362000,China
  • Received:2020-09-09 Online:2021-06-10 Published:2021-06-08
  • Contact: WEI Zheng E-mail:zheng0wei@hotmail.com
  • Supported by:
    the Faculty Research Startup Grant of Fuzhou University, China(GXRC?20010)

Abstract:

It is well known that the saturated structure in the non-reducing end(NRE) of heparin/heparan sulfate(HS) oligosaccharides is lacking ultraviolet(UV) 232 nm absorbance(normally used for specific detection of C4―C5 unsaturated oligosaccharides), which poses a significant challenge for structure analysis. However, we found that saturated heparin oligosaccharides can be detected at UV 232 nm with sufficient sensitivity in our previous research. In order to further study the UV 232 nm absorbance of the saturated structure, four saturated heparin disaccharides were prepared, and then their UV 232 nm absorptions were analyzed by ion-pair reversed-phase liquid chromatography ion-trap/time-of-flight mass spectrometry(RPIP-LC/MS-IT-TOF) with photodiode array detector. The results show that the saturated heparin disaccharides can be detected with sufficient sensitivity by absorbance at UV 232 nm, which still with 7%―40% of UV 232 nm intensity of heparin unsaturated disaccharides. It seems that the UV 232 nm intensity might be affected by the sulfate groups in the disaccharides. In addition, comparing to the common unsaturated heparin/HS disaccharides as references, the disaccharides with GlcNH3+ residues also showed less sensitivity at UV 232 nm. Finally, we simplified the sequencing method of the N-unsubstituted dp6 oligosaccharides by a simple UV detection method, combined with pH 4.0 HNO2 scission and RPIP-LC/MS-IT-TOF analysis. This strategy offers possibilities for sequencing at N-sulfated residues using alternative pH 1.5 HNO2 scission.

Key words: Heparin, Saturated structure, Ultraviolet absorption, Mass spectrometry, Sequencing

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