[Fingerprint research on immunosuppressive fraction of Rehmanniae Radix by HPLC].

Objective: To study the HPLC fingerprint of immunosuppressive fraction of Rehmanniae Radix, the genuine medicinal materials in Henan province.

Methods: By HPLC method,Dikma Platisil-C18 column (250 mm x 4.6 mm, 5 microm) was used with acetonitrile-0.1% phosphoric acid as mobile phase by gradient elution. The detection wavelength was 210 nm, flow rate was 1.0 mL/min and column temperature was set at 30 degrees C.

Results: Compared the 10 batches sample of the fingerprint similarity, 18 common peaks were marked and five peaks were identified. The similarities were more than 0.9.

Conclusion: HPLC fingerprint of immunosuppressive fraction of Rehmanniae Radix is established, which lays the foundation for further pharmacodynamics research on Rehmanniae Radix.