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Tytuł:
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Shrinking factors of hyperbranched polysaccharide from fungus.
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Autorzy:
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Tao Y; Key Laboratory of Green Processing and Functional Textiles of New Textile Materials, Ministry of Education, Wuhan University of Science and Engineering, Wuhan 430073, China. />Yan Y
Xu W
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Źródło:
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Carbohydrate research [Carbohydr Res] 2009 Jul 27; Vol. 344 (11), pp. 1311-8. Date of Electronic Publication: 2009 May 09.
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Typ publikacji:
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Journal Article; Research Support, Non-U.S. Gov't
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Język:
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English
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Imprint Name(s):
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Publication: Amsterdam : Elsevier
Original Publication: Amsterdam.
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MeSH Terms:
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Polysaccharides/*chemistry
Glucans/chemistry ; Linear Models ; Pleurotus/chemistry ; beta-Glucans/chemistry
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Substance Nomenclature:
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0 (Glucans)
0 (Polysaccharides)
0 (beta-Glucans)
6930DL209R (curdlan)
8ZQ0AYU1TT (pullulan)
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Entry Date(s):
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Date Created: 20090610 Date Completed: 20091014 Latest Revision: 20161125
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Update Code:
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20240104
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DOI:
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10.1016/j.carres.2009.05.004
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PMID:
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19505679
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The branched structure properties of hyperbranched polysaccharides (TM3a and TM3b), extracted from sclerotia of Pleurotus tuber-regium, were studied by using laser light scattering and viscometry. The configurational shrinking factor (g) and viscometric shrinking factor (g') of TM3a and TM3b were discussed, where curdlan and pullulan were taken as the linear references for derivation of g and g'. The dependences of g factor, g' factor, and Flory factor (Phi(branched)) on weight average molecular weight (M(w)) were established to be g=1.07x10(2)M(w)(-0.48+/-0.09), g'=3.63x10(1)M(w)(-0.43+/-0.01), and Phi(branched)=7.08x10(20)M(w)(0.39+/-0.1) for TM3a in 0.25M LiCl/DMSO at 25 degrees C, when curdlan acted as the linear reference. A power law relationship g'=2.71x10(-1)g(-0.61+/-0.1) for TM3a was found, and the exponent was approximately same to 0.60 established by Kurata et al. for polystyrene star molecules. The dependence of g factor on M(w) for TM3b was found to be g=1.99x10(2)M(w)(-0.53+/-0.02), when pullulan was used as the linear reference. On the basis of Zimm-Stockmayer equation for tetrafunctional units, molecular weight of branching unit (M(0)) deduced from nonlinear curve fitting of g versus M(w) was 8739+/-564g/mol and 3961+/-1245g/mol for TM3a and TM3b, respectively. The effect of different linear reference curves and polydispersity was discussed. This work gave valuable information on branched structure characterization and insights into the biosynthetic pathways of the hyperbranched polysaccharide from fungus.