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Citation: Zheng Chang-Ren, Zhu Zhi-Min, Gu Yun-Le, Hu Lei, Fu Ting-Zhi, Ou Hui-Chun. Studies on the Dilute Solution Behavior of Polysaccharide of Pleuratu Ostretus[J]. Acta Physico-Chimica Sinica, ;1992, 8(04): 493-499. doi: 10.3866/PKU.WHXB19920413 shu

Studies on the Dilute Solution Behavior of Polysaccharide of Pleuratu Ostretus

1.
Nanjing Institute of Chemical Technology, Nanjing 210009; Department of Biology, Nanjing University

Received Date: 25 March 1991
Available Online: 15 August 1992

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 ...
- Pleuratu ostreatus; Polysaccharide; Dilute solution; Molecular weight; Cloud-point titration
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