高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (6): 957.

• 研究快报 • 上一篇    下一篇

基体辅助激光解吸电离质谱法对DNA样品的高分辨率测定

邓慧敏, 黎军, 赖志辉, 查庆民, 赵善楷   

  1. 中山大学测试中心, 广州 510275
  • 收稿日期:1999-01-23 出版日期:1999-06-24 发布日期:1999-06-24
  • 通讯作者: 赵善楷
  • 作者简介:邓慧敏,女,43岁,副教授.
  • 基金资助:

    国家自然科学基金(批准号:29475220)资助课题

High Resolution Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry Analysis of DNA

DENG Hui-Min, LI Jun, LAI Zhi-Hui, ZHA Qing-Min, ZHAO Shan-Kai   

  1. Instrumental Analysis & Research Center, Zhongshan University, Guangzhou, 510275
  • Received:1999-01-23 Online:1999-06-24 Published:1999-06-24

摘要: 基体辅助激光解吸电离飞行时间质谱(MALDI-TOF-MS)法因其具有测定质量范围大、灵敏度高、速度快及精确度好等优点,近年来已成为测定多肽、蛋白质、核酸、多糖等生物大分子分子量及其一级结构的有力工具.

关键词: 基体辅助激光解吸电离, DNA, 高分辨率质谱图

Abstract: High resolution mass spectra of DNAs amples were acquired by using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF-byMS) using mixture of 3-hydroxypiclinic acid and picnilic acid as a matrix. The resolutions of d(C)10, d(G)10, d(T)18, and d(TTACTCTGTTAATGTCTTTG) mono-isotope peaks have reached 5513, 3895, 10468 and 8769 respectively. The experiment results showed that the DNA samples with a higher purity and stability could get higher resolutions. C18Sep-Pak cartridge, NH4+cation-exchange resin and nitrocellulose(NC) film substrate have been applied to eliminating Na+, K+ions and other impurities from DNA syntheses, and to purifying the analytes and obtaining high resolution mass spectra with enhanced sensitivity and reproducibility.

Key words: Matrix-assisted laser desorption ionization, DNA, High resolution mass spectrometry

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