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Benzylglucosinolate (BG) was extracted by 70% methanol from maca and purified on acidic alumina column and semi‐preparative Cosmosil cholester column. The purified sample was verified as BG by electrospray ionisation mass spectrometry (ESI‐MS) and nuclear magnetic resonance spectra. The purity was 98.3% as determined by HPLC‐MS. BG content of maca was quantified using external standard method by HPLC...
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