1.Xinjiang Institute of Materia Medica,Xinjiang Key Laboratory of Chinese Materia Medica and Ethnic Materia Medica,Xinjiang Key Laboratory of Traditional Chinese Medicine Resources Research and Development,Urumqi 830010,Xinjiang,China
2.College of Traditional Chinese Medicine,Xinjiang Medical University,Urumqi 830017,Xinjiang,China
3.Xinjiang Huashidan Pharmaceutical Research Co. Ltd. ,Urumqi 830011,Xinjiang,China
To investigate the differences in main chemical components and in vitro antioxidant activity of Rehmanniaglutinosa Libosch. from different geographical origins, and to provide a basis for the quality evaluation and rational utilization of its medicinal resources. The contents of catalpol, rehmannioside D, verbascoside, and echinacoside in 16 batches of Rehmannia glutinosa Libosch. were determined by HPLC-PDA. The antioxidant activities were evaluated by DPPH and ABTS free radical scavenging assays. The relationship between chemical components and antioxidant activity was explored by combining cluster analysis (HCA), principal component analysis (PCA), and Pearson correlation analysis. Results showed that there were significant differences in the chemical composition of samples from different origins. The highest content of catalpol (31.021 mg/g) was found in samples introduced from Linfen, Shanxi to Xinjiang. The highest content of rehmannioside D (5.633 mg/g) was in samples from Jiaozuo, Henan. The highest contents of echinacoside (0.509 mg/g) and verbascoside (1.352 mg/g) were in samples introduced from Quwo County and Baoyan, Shanxi to Xinjiang, respectively. Samples introduced from Quwo County, Shanxi to Xinjiang exhibited the strongest antioxidant activity (DPPH IC50 8.97 mg/mL, ABTS IC50 5.29 mg/mL). Correlation analysis indicated that the content of echinacoside was significantly negatively correlated with the DPPH IC50 value (P<0.05), suggesting it as a key antioxidant component. In summary, the introduced Rehmannia glutinosa Libosch. in Xinjiang exhibits unique advantages in terms of specific chemical component accumulation and comprehensive antioxidant activity. This study provides a scientific basis for the quality evaluation, origin selection, and identification of key quality markers of Rehmannia glutinosa Libosch.
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