Abstract
The caterpillar-shaped Chinese medicinal mushroom Cordyceps sinensis consists of the fruiting body (CsA) and the host caterpillar (CsB). Ergosterol is a principal sterol in fungi and can indicate the level of mycelia of C. sinensis. Ergosterol is present in two forms, as free ergosterol and esterified ergosterol, which have different physiological functions. The relative abundances of free to esterified ergosterol are different among the various species. In the present study, a gradient reversed-phase high-performance liquid chromatography (HPLC) method was developed for the simultaneous determination of free and esterified ergosterol in CsA and CsB of C. sinensis. The results showed that CsA and CsB had similar ergosterol compositions, but the level of ergosteryl esters in CsB was much higher than that in CsA, indicating that CsA and CsB might be in different growth phase or have different physiological functions for the growth and multiplication of C. sinensis.
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