On-Line Solid-Phase Extraction Based on Poly (Nipaam-MAA-co-EDMA) Monolith Coupled with High-Performance Liquid Chromatography for Determination of Nitrendipine and Nisoldipine in Human Urine

Yanhui Duan, Haiyan Liu^*, Suying Sun, Yanzhao Gu, Jia Li and Gengliang Yang

College of Pharmacy, Hebei University, Hebei Province Key Laboratory of Pharmaceutical Quality Control, Baoding, 071002, China, E-mail: Duan.yanhui@gmail.com

^*Corresponding Author: Haiyan Liu, College of Pharmacy, Hebei University, Hebei Province Key Laboratory Of Pharmaceutical Quality Control Baoding, 071002, China, Tel: +86 312 5971107, Fax: +86 312 5971107 Email: