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Mycelia of Antrodia cinnamomea were extracted with chloroform and hot water. A neutral polysaccharide named ACN2a separated from the water extract was purified using 10% CCl3COOH, and repeated column chromatography on HW-65 and DE-52 cellulose. Its structure was determined by chemical and spectroscopic analyses. ACN2a was composed of Gal, Glc, Fuc, Man and GalN (in the ratio 1:0.24:0.07:0.026:faint), in which an alpha-D-(1--&gt;6)-Gal linkage accounted for 73% of all linkages. The ratio of branch points was about 16% of the total residual numbers, and branches were attached to C-2 of galactosyl residues of the main chain. ACN2a had an average molecular weight of 12.9x10(5) Daltons, [alpha]D25=+115 degrees (c=0.44, H2O); [eta]=0.0417dl.g-1, Cp=0.2663 cal/(g. degrees C). The hepatoprotective effect of ACN2a was evaluated using a mouse model of hepatic injury that was induced by Propionibacterium acnes (P. acnes) and lipopolysaccharide (LPS). The administration of ACN2a (0.4, 0.8 g/kg/d, p.o.), significantly prevented increases in serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) enzyme activities in mice treated with P. acnes-LPS, indicating hepatoprotective activity in vivo.

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Protective Effects of a Neutral Polysaccharide Isolated from the Mycelium of &lt;i&gt;Antrodia cinnamomea&lt;/i&gt; on &lt;i&gt;Propionibacterium acnes&lt;/i&gt; and Lipopolysaccharide Induced Hepatic Injury in Mice