Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (6): 20220023.doi: 10.7503/cjcu20220023

• Organic Chemistry • Previous Articles     Next Articles

Combined PGC-Triple-Tof-MS Enables the Separation, Identification of Sugar Beet Pectin Derived Oligomers

ZHU Kai1, LI Jie1, WU Xiaoyi1, HU Weiwei1, WU Dongmei1, YU Chengxiao1, GE Zhiwei4, YE Xingqian1,2,3, CHEN Shiguo1,2,3()   

  1. 1.Zhejiang International Scientific and Technological Cooperation Base of Health Food Manufacturing and Quality Control,College of Biosystems Engineering and Food Science,Integrated Research Base of Southern Fruit and Vegetable Preservation Technology,Zhejiang Key Laboratory for Agro Food Processing,National Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment,Zhejiang University,Hangzhou 310058,China
    2.Fuli Institute of Food Science,Zhejiang University,Hangzhou 310058,China
    3.Ningbo Research Institute,Zhejiang University,Ningbo 315100,China
    4.Agricultural And Biological Testing Center,Zhejiang University,Hangzhou 310058,China
  • Received:2022-01-09 Online:2022-06-10 Published:2022-02-16
  • Contact: CHEN Shiguo E-mail:chenshiguo210@163.com
  • Supported by:
    the Zhejiang Province Key R & D Projects, China(2021C02001);the Zhejiang University Scientific Research Development Project, China(2021C02001)

Abstract:

Sugar beet pectin(SBP) was extracted by high-temperature acid method, the water-eluted components(SBPW) and salt-eluted components(SBP3) were obtained by strong anion exchange chromatography. The results of monosaccharide composition and molecular weight analysis showed that SBPW was mainly composed of galactose(Gal), arabinose(Ara) and galacturonic acid(GalA), with a molecular weight of 1100, while SBP3 was dominated by GalA and weighted 41450. Combined sequential enzymatic degradation and porous graphitized carbon column-quadrupole-time-of-flight mass spectrometry(PGC-Triple-Tof MS), the fine structure of SPPW and SPP3 oligosaccharides was analyzed. The results showed that the main chain of SPBW was [→4)-α-GalA-(1→2)-α-Rha-(1→] repetitive units composed of RG-Ⅰ pectin, and neutral sugar side chain [α-(1→5) arabinan and β-(1→4) galactan] were substituted for Rha at the O-4 position. SBP3 consisted of HG and RGⅠ with a molar of 3:2, HG was a linear structure of α-1,4-linked GalA, HG and RG-Ⅰ domains were connected directly by α-1,4 glycoside bonds. New characteristic structures of oligosaccharide have also been found, similar to α-GalA(1→2)α-Rha(1→4)α-Rha(1→4)α-GalA(1→2)α-Rha.

Key words: Sugar beet, Pectin, Oligosaccharide, Structure analyses, Porous graphitized carbon column-Tandem mass spectrometry

CLC Number: 

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