Ion-pairing liquid chromatography with on-line electrospray ion trap mass spectrometry for the structural analysis of N-unsubstituted heparin/heparan sulfate. - Du, Jia Yan; Chen, Lan Rong; Liu, Su; Lin, Jiang Hui; Liang, Qun Tao; Lyon, Malcolm; Wei, Zheng (Journal of Chromatography B: Analytical Technologies in the Biomedical & Life Sciences, 2016)