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1.Methods Chromatographic condition: Hypersil C18 BDS column(200 mm×4.6 mm,5 μm)was used and the mobile phase was acetonitrile-0.007% dipotassium hydrogen phosphate(8∶92),detected at 260 nm,the flow rate was 1.0 mL·min-1,and the temperature was 30 ℃.
方法在C18BDS柱(200 mm×4.6 mm,5μm)上,以乙腈-0.007%磷酸氢二钾溶液(8∶92)为流动相,检测波长为260 nm,流速为1.0 mL. min-1,柱温为30℃测定注射用头孢西丁钠有关物质。收藏指正
2.The mobile phase was phosphate buffer solution(disodium hydrogen phosphate 2.76 g and citric acid 1.29 g dissolved in water and diluted to 1 000 ml)-acetonitrile(80∶20) and detected at 254 nm.
磷酸盐缓冲液(取无水磷酸氢二钠2.76 g,枸橼酸1.29 g,加水溶解稀释成1 000ml)-乙腈(80∶20)为流动相; 检测波长为254 nm,柱温为30℃。收藏指正
3.A C18 column and a mobile phase of 0. 05mol/L disodium hydrogen phosphate solution(adjusted to PH 6. 0 using phosphoric acid)-acetontrile(88: 12 ) were employed. The detective wave was 240urn.
采用C18柱，流动相为0．05mol／L磷酸氢二钠溶液（用磷酸调至pH6．0）-乙腈（88：12），检测波长为240nm。收藏指正
4.method : using ODS colum,0. 06mol/L dipotassium hydrogen phosphate (adjust the solution with 10mol/ml potassium hydroxide to pH 9. 0)-ace-tonitrile (35 : 65) as mobile phase,The column temperature was 40℃.
方法:采用ODS柱,以0.06mol/L磷酸氢二钾溶(10mol/ml氢氧化钾溶液调节pH至9.0)-乙腈(35:65)为流动相,柱温:40℃;收藏指正
5.Ethanol is a strong proton donor and proton accepter . Its strong hydrogen bond interaction with solute and CSP is important for the direct resolution. In order to obtain both the low retention time and a high R s, we chose the mobile phase with n hexane∶1,2 dichloroethane∶ethanol(V/V/V)=77∶21∶2. Other organic modifiers such as methanol, iso propanol, n butanol and acetonitrile were also used.
优化的正相色谱流动相的组成为正己烷／1，2－二氯乙烷／乙醇（77∶21∶2，V／V／V）。收藏指正
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