Preliminary study in glycyrrhizin content and its influencing factors of wild and cultivated in different region of China

OBJECTIVE: In order to understand the glycyrrhizin content range in the wild and cultivated Glycyrrhiza uralensis in China and to find the related influencing factors of glycyrrhizin content. METHOD: The glycyrrhizin content of 165 wild and 1 013 cultivated G. uralensis samples from 37 countries in 9 provinces was determined by HPLC, and the effects of the producing region, medicinal parts, cultivation years, soil type and texture on the glycyrrhizin content were analyzed. RESULT AND CONCLUSION: The average glycyrrhizin content was (4.43 +/- 1.32)% in the wild G. uralensis population, and (1.51 +/- 0.49)% in the cultivated and the glycyrrhizin content in the cultivated was less than the minimum sandards in the Chinese Pharmacopoeia. The glycyrrhizin content was significant different in the wild and cultivated G. uralensis in different producing regions, respectively. The glycyrrhizin content in roots and rhizome of the wild G. uralensis had no significant difference, it had no significant difference in the cultivated G. uralensis from 1 to 4 years and it increased rapidly after 5 years, and the effects of the soil types and texture on it were significant.