色谱条件:
Column: Agilent zobax, C18(150*4.6, 5um)
Column Temperature: 50 °C
Detector temperature(RI): 50 °C
Buffer: pH 2.50 ± 0.05 phosphate buffer
Accurately weigh 4.6 g of NH
4H
2PO
4 into 1L of water and adjust pH to 2.50 with HPLC grade phosphoric acid.
Mobile phase: Buffer:MeOH= 55 :45, V/V, premix. flow rate: 1.5ml/min
Injection Volume:50 uL
WKS concentration: 0.28mg/ml
色谱结果:
结果分析:
样品为盐酸盐类,0.28mg/ml 时pH为5.8。采用Zorbax Eclipse plus-C18色谱柱也没有改善。拖尾因子为2.85。
当样品浓度为0.028mg/ml时,Tailing为1.17。
但是现在需要将样品浓度做到0.28mg/ml。如何方能解决拖尾问题,请各位指教。