Objective To establish a HPLC method for determining the content of oleanolic acid in Radix araliae armatae.Methods Stationary phase was Lichrospher-C18(4.6 mm?250 mm,5 ?m),mobile phase was methanol-0.2% phosphoric(85:15),detection wavelength was 210 nm,flow rate was 1.0 mL/min and column temperature was 30 ℃.Results There was good linearity in the range of 0.059～0.59 ?g for oleanolic acid.The average recovery of oleanolic acid were 95.4% with RSD=0.67%(n=6).Conclusion This method is rapid and accurate.It can be applied to control the quality of Radix araliae armatae effectively.

Objective To evaluate the value of helical CT scan in the diagnosis of small renal cell carcinoma.Methods The helical CT features of small renal cell carcinoma proved by operation and pathology in 14 cases were studied retrospectively.Results CT showedisodense mass in 7 cases,slightly low density mass in 5 cases,slightly hyperdense mass in 1 case,cystic and solid mass in 1 case,and among them 2 cases showed punctural calcification.The lesions showed marked enhancement in cortical phase in 12 cases,slight to moderateenhancement in 2 cases,in parenchymal phase,the tumor density dropped promptly,and in the pelvic phase the tumor density droppedfurther. Conclusion Small renal cell carcinoma is of certain characteristic on multi-phasic spiral CT contrast-enhanced scan,it is a very valuable method in diangosis of small renal cell carcinoma.