Acta Phys. -Chim. Sin. ›› 1992, Vol. 8 ›› Issue (04): 493-499.doi: 10.3866/PKU.WHXB19920413

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Studies on the Dilute Solution Behavior of Polysaccharide of Pleuratu Ostretus

Zheng Chang-Ren; Zhu Zhi-Min; Gu Yun-Le; Hu Lei; Fu Ting-Zhi; Ou Hui-Chun   

  1. Nanjing Institute of Chemical Technology, Nanjing 210009; Department of Biology, Nanjing University
  • Received:1991-03-25 Revised:1991-11-26 Published:1992-08-15
  • Contact: Zheng Chang-Ren

Abstract: The polysaccharide of pleuratu ostreatus was fractionated by repeated precipitation method. Modified Elias cloud-point titration method with an UV detecter was used to determine the cloud-point. It was found that water/acetone (83.5:16.5 by volume) is a θ-solvent for the polymer at 25 ℃. Number average molecular weights of all samples fractionated were characterized by rapid dynamic membrane osmometry and viscometry. The second virial coefficient A_2 decreases as the molecular weight in-creases. The relationship is A_2=2 slope (M_nRT)~(-1/2).
The intrinsic viscosities were determined by capillary viscometry in θ-solvent. Thus and thus a mondispersed [η]~M relationship has been obtained:
[η]_θ=0.124~(0.513)
The unperturbed dimension ...

Key words: Pleuratu ostreatus, Polysaccharide, Dilute solution, Molecular weight, Cloud-point titration