Citation: . COMPARISON OF POLYSACCHARIDES ISOLATED FROM THE MYCELIA OF A CULTIVATED STRAIN OF PORIA COCOS GROWN IN DIFFERENT LIQUID CULTURE MEDIA*[J]. Chinese Journal of Polymer Science, ;2003, 21(4): 465-472. shu

COMPARISON OF POLYSACCHARIDES ISOLATED FROM THE MYCELIA OF A CULTIVATED STRAIN OF PORIA COCOS GROWN IN DIFFERENT LIQUID CULTURE MEDIA*

Received Date: 27 September 2002
Revised Date: 14 January 2003

Mycelium of a cultivated strain of Poria cocos was grown by submerged fermentation in a liquid mediumcontaining corn steep liquor with orbital shaking. Six polysaccharides coded as ac-PCM1, ac-PCM2, ac-PCM3-Ⅰ andⅡ, ac-PCM4-Ⅰand Ⅱ were isolated from the myelium by extracting with 0.9% NaCl aqueous solution, hot water, 0.5 mol/L NaOHaqueous solution and 88% formic acid. Exo-polysaccharide was obtained from the culture medium and coded as ac-PCM0.The monosaccharide composition and molecular weights of these polysaccharides were characterized by using infrared spectroscopy,gas chromatography,elemental analysis,13C-NMR,viscometry and light scattering.The results indicated that ac-PCM1,ac-PCM1 and ac-PCM2 are heteropolysaccharides containing glucose,galactose,mannose and fucose,and ac-PCM3-I and ac-PCM3-II mainly consist of D-glucose.The content of the glucose in the polysaccharides increased with the isolation progress.Remarkably,α-glucan and β-glucan coexisted in the extract by NaOH aqueous solution (ac-PCM3), and could be separated by chemical methods.The protein in the ac-PMC polysaccharides cultured from the medium containing corn steep liquor was higher than that in the ab-PCM from the medium with bran extract.Therefore,the polysaccharides from Poria cocos mycelia cultured in different media have different chemical composition,molecular weights and conformations.
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