[Determination of rubrofusarin gentiobioside in Cassia obtusifolia by HPLC].

OBJECTIVE

To establish a method for determining the content of rubrofusarin gentiobioside in Cassia obtusifolia.

METHODS

The HPLC with Diamonsil C18 (4.6 mm x 250 mm, 5 microm) column was used, acetonitrile-THF-1% acetic acid (18: 3:79) was used as a mobile phase, with flow rate of 1 mL x min(-1), column temperature at 40 degrees 2 and detection wavelength at 278 nm.

RESULTS

A good linearity was obtained from 0.1-0.5 microg with r = 0.999 9 for rubrofusarin gentiobioside. The average recovery was 101.1%, and RSD was 2.23% (n = 5).

CONCLUSIONS

The method was proved to be simple, rapid, sensitive, precise, reliable and repeatable. It can be applied to the quality control of Semen Cassia.