The effects of carbonizing temperature and heating time on HPLC fingerprints of Flos Sophorae

AIM: To explore the effects of carbonizing temperature and time on HPLC fingerprints of Flos Sophorae for improving the processing technics of Flos Sophorae carbonized.METHODS: Samples were prepared by an oven for different time and at different temperatures,separately.Then the fingerprints of the samples were determined by HPLC,separately.According to the fingerprints of the crude drug,the differences between the fingerprints of the samples were compared. RESULTS: Heated for 30 min,there was no significant change of the fingerprints of the samples which were heated at 120(°C)-150(°C);there was a little change in the fingerprints when the samples were heated at 170(°C),but the significant change was observed when they were heated at 180(°C)-190(°C).The fingerprints showed the chemical constitutents were almost destroyed over 200(°C).Over 160(°C),the effects on the samples which were heated for 60 min were more obviously than on those which were heated for 30 min. CONCLUSION: According to the change of the fingerprints and in view of the efficient usage of the energy,Flos Sophorae carbonizing should be heated at 185(°C)±2 (°C) and for 30 min.