A method for isolating one compound or more than one compound from a biomasswhich contains microorganisms that have produced the compound or compounds,the method comprising the following steps: (a) preparing or obtaining wetcells having an average moisture content of between 30% and 80%； (b)subjecting the wet cells to primary drying to obtain primary dried cellshaving an average moisture content of between 5% and 50%； (c) subjecting theprimary dried cells obtained in (b) to secondary drying to obtain secondarydried cells having an average moisture content of no greater than 10%； and (d)extracting or isolating, purifying and/or refining the compound or each of thecompounds from the secondary dried cells obtained in (c) .
