The attached particles were collected
one by one with the tweezers. They were dissolved in the heated water
(40 ◦C) and the suspended solid were removed by filtration, then the filtrate
was freeze-dried. After measurement of weight of all the freeze-dried products,
it was dissolved in distilled water at 100 mg/L and the cordycepin concentration
was determined by the HPLC. The cordycepin content in the crystallized
compounds was calculated based on the cordycepin concentration of the said solution