Objective To supply evidence for determining the optimal collecting period for Sambucus chinese.Methods A RP-HPLC method was established to determine chlorogenic acid contents from Sambucus chinese in various collecting periods.The chromatographic conditions were as follows: Hypersil-ODS2(250 mm? 4.6 mm,5 ? m)column,acetonitrile-1 % formic acid aqueous solution(9 ∶ 91) as mobile phase with a flow rate of 1.0 mL? min-1,column temperature at 35 ℃ and the detection wavelength at 326 nm.Results Content of chlorogenic acid in the samples collected in May(pre-blossom period)was the highest and the content in leaf was higher than in the stem and root.Conclusion It is suggested that Sambucus chinese should be gathered before blooming when the leaves are in luxuriance.

Objective To make the chromosome karyotype analysis of 130 patients with leukemia by using the improved chromosome short-term culture method.Methods We optimized the main factors with a single factor gradient experiment in short-term culture of bone marrow chromosome, including colchicines concentration, duration of action of colchicines,and hypotonic time.On this basis,we conducted the three-factors and three-level orthogonal experiment to achieve improved bone marrow chromosome preparation system,which was later applied in 130 patients with leukemia in our hospital.Results The orthogonal experiment results showed that the optimum conditions were colchicines concentration of 0.07 μg/mL,colchicines action time of 80 min,and hypotonic time of 35 min during the preparation of the bone marrow chromosome.Using this method,the chromosome preparation success rate reached 97.69% and the detection rate of abnormal karyotype reached 82.3% in the chromosome karyotype analysis.Conclusion Bone marrow chromosome preparation system with colchicines concentration of 0.07 μg/mL and colchicines action time of 80 min,and hypotonic time of 35 min is worthy of clinical promotion.