The structure of an alkali-soluble D-glucan (AG-AL) from the fruit body of Agrocybe cylindracea was investigated by a combination of chemical and spectroscopic methods indicating that it was a linear (1→3)-α-D-glucan (molecular weight, ~560,000), [α]D2O +195° (c 0.5, m sodium hydroxide). Both water-soluble and gelatinous products obtained by O-(carboxymethyl)ation of AG-AL showed potent antitumor activity against the solid form of Sarcoma 180 in mice, although the native D-glucan had little effect on the tumor.
mice, glucan, sarcoma 180, Agrocybe cylindracea, carboxymethylated derivative
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