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[Objective] To determine the diosgenin content of Dioscorea opposita Thunb. tubers and bulbils. [Method] With 5% vanillin-glacial acetic acid-perchloric acid as color developing agent and oleanolic acid as the control substance, the content of diosgenin in D. opposita tubers and bulbils was measured using an ultraviolet visible spectrophotometer at the detection wavelength of 547nm. [Result] The content of diosgenin in D. opposita tubers and bulbils was 0.0164% and 0.0213%, respectively. The average recovery of diosgenin was 98.46% with relative standard deviations (RSD) of 1.36%. Besides, the content of diosgenin in bulbil was slightly higher than that in D. opposita tubers. [Conclusion] The method is simple, easy, accurate, and suitable for content determination of diosgenin in D. opposita tubers and bulbils.
[Objective] To determine the diosgenin content of Dioscorea opposita Thunb. Tubers and bulbils. [Method] With 5% vanillin-glacial acetic acid-perchloric acid as color developing agent and oleanolic acid as the control substance, the content of diosgenin in D. opposita tubers and bulbils was measured using an ultraviolet visible spectrophotometer at the detection wavelength of 547 nm. [Result] The content of diosgenin in D. opposita tubers and bulbils was 0.0164% and 0.0213%, respectively. The average recovery of diosgenin was 98.46% with In addition, the content of diosgenin in bulbil was slightly higher than that in D. opposita tubers. [Conclusion] The method is simple, easy, accurate, and suitable for content determination of diosgenin in D opposita tubers and bulbils.