Abstract: To provide valuable reference for selecting optimal origin of Chinese herbal medicine, Schisandra chinensis fruits were collected from 16 origins, and theirdeoxyschizandrin and schisandrin B contents were analyzed by HPLC. The results indicated that there exited significant differences in deoxyschizandrin and schisandrin B contents among different origins, with the highest contents being 2.14 and 3.3 times as high as those of the lowest, respectively. The deoxyschizandrin content had a significant positive correlation with temperature and humidity, while schisandrin B content didn't. The Weihe County in Heilongjiang Province and Liuhe County in Jilin Province were tentatively selected as the optimal origins of S. chinensis fruit based on thecontents of main medicaments.

Key words: Chlorine dioxide, Algaecide, Phaeocystis globosa, Red tide