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OBJECTIVE: To establish a method for the determination of the peroxide value of hydroxycamptothecin freeze-dried liposome. METHODS: Colorimetric method with ferric thiocyanate and UV spectrophotometry were adopted for the content determination of peroxide value at detection wavelength of 500 nm. RESULTS: The linear range of iron was 0.2～4 ?g?mL-1 (r=0.999 0) with an average recovery of 99.2% (RSD=1.2%, n=9). The peroxide value of 3 batches of hydroxycamptothecin freeze-dried liposome was 0.48,0.45,0.43 mmol?kg-1. CONCLUSION: The method is sensitive and precise for the determination of the peroxide value of liposome.
RESUMO
Objective To explore the optimal process conditions for cold-soaking extraction of fat-soluble components in Radix Salviae Miltiorrhizae.Methods Tanshione Ⅱwas determined by HPLC.The effect of different concentrations of ethanol and comminution on the extraction rate of tanshione Ⅱwas observed,and the process conditions were optimized by orthogonal test.Results The optimal process conditions for obtaining higher extraction rate of tanshione Ⅱwere as follows: the medicinal material was extracted by cold-soak extraction with 95% ethanol for two times(3 hours for each time),and the volume of ethanol was as much as 8 times of the medicinal material.Conclusion The extraction process is simple,stable and efficient for Radix Salviae Miltiorrhizae.
RESUMO
Objective To determine the content of aconitine-type alkaloids in Bitongxiao Ointment,and to control the limits of aconitine-type alkaloids in the ointment.Methods Acid-dye colorimetry was employed and methodology was examined for linear range,average recovery,precision,exclusivity and stability.Results The method has a good precision and stability.The linear range of aconitine-type alkaloids was in 0.111 9～0.714 mg(r=0.999 3),and the average recovery was 97.4 %.Conclusion The method is accurate,reliable,simple,can be used to determine the content of aconitine-type alkaloids in Bitongxiao Ointment.