title: [Establishment and application of a two-dimensional liquid chromatographic system (NPLC x RPLC)].
abstract: A two-dimensional liquid chromatographic system (NPLC x RPLC) has been developed. Normal phase liquid chromatography (NPLC) with a Hypersil SiO2 column (50 mm x 4.6 mm) was used as the first dimension, and reversed-phase liquid chromatography (RPLC) with a Kromasil C18 column (250 mm x 4.6 mm) was used as the second dimension. The interface was a ten-port, two-position valve with two storage loops. As to improve the compatibility of the two dimensional mobile phase and be good for adjusting the selectivity of separation, 1,4-dioxane was used in the mobile phase of the first dimension, and isopropyl alcohol was used in the mobile phase of the second dimension based on the characters of the organic solvents. By raising the temperature of the second dimension, the incompatibility of the two dimensional mobile phases was avoided. A Chinese potent medicine, Zhengtian Wan, was analyzed by this system. The total peak capacity reached 1 220.
authors: Chemical Engineering Institute, Nanjing University of Science and Technology, Nanjing 210094, China. jxls231899@yahoo.com.cn
authors: Tao
authors: T
authors: Lan
authors: Fenglong
authors: F
authors: Jiao
authors: Tao
authors: T
authors: Tang
authors: Fengyun
authors: F
authors: Wang
authors: Tong
authors: T
authors: Li
authors: Weibing
authors: W
authors: Zhang
mesh_terms: D056148:Chromatography, Reverse-Phase / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000032:analysis / Q000737:chemistry; D013696:Temperature; D013997:Time Factors
chemical_list: D004365:Drugs, Chinese Herbal