title: Separation and purification of bovine serum albumin binders from Fructus polygoni orientalis using off-line two-dimensional complexation high-speed counter-current chromatography target-guided by ligand fishing.
abstract: In this study, off-line two-dimensional (2D) complexation high speed counter-current chromatography (HSCCC) was developed for the separation of bovine serum albumin (BSA) binders from the ethyl acetate extract of Fructus polygoni orientalis. Target-guided strategy of BSA functionalized iron oxide magnetic nanoparticles coupled with high performance liquid chromatography-tandem mass spectrometry ((BSA-Fe3O4 MNPs)-HPLC-MS/MS) experiment was proposed. In the orthogonal separation system, a Normal-Phase HSCCC with 0.01mol/L copper ion as complexation agent in the aqueous phase was employed for the first dimension and Recycling HSCCC, Reverse-Phase HSCCC with 0.1mol/L copper ion were used for the second dimension in parallel. Including two pairs of cis-trans isomers, seven BSA binders including 3,5,7-Trihydroxychromone (1), taxifolin (2), N-cis-paprazine (3), N-cis-feruloyltyramine (4), N-trans-paprazine (5), N-trans-feruloyltyramine (6) and an unidentified compound (7) were obtained. The purities of these seven compounds were all over 95.0% as determined by HPLC. The complexation HSCCC behaviors of seven compounds were also investigated by studying their relationship with copper ion. Results showed that the combinative method using (BSA-Fe3O4 MNPs)-HPLC and HSCCC is a quick, efficient, and reproductive technique to isolate potentially bioactive compounds from the complex mixture system of natural products. And the usage of off-line 2D-HSCCC and introduction of chelating metal ion into solvent system are effective ways to implement HSCCC separations in complex samples.
authors.affiliation: School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Liu
authors.forename: Shuyun
authors.initials: S
authors.lastname: Shi
authors.forename: Liangliang
authors.initials: L
authors.lastname: Liu
authors.forename: Hua
authors.initials: H
authors.lastname: Yang
authors.forename: Wen
authors.initials: W
authors.lastname: Su
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Chen
mesh_terms: D000818:Animals; D002417:Cattle; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003377:Countercurrent Distribution / Q000379:methods*; D010936:Plant Extracts / Q000032:analysis* / Q000302:isolation & purification / Q000378:metabolism*; D019664:Polygonaceae / Q000737:chemistry*; D011485:Protein Binding; D012710:Serum Albumin, Bovine / Q000378:metabolism*; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D010936:Plant Extracts; D012710:Serum Albumin, Bovine
keywords: Fructus polygoni orientalis; HPLC–MS/MS; HSCCC; Off-line two-dimensional high-speed counter-current chromatography; Target-guided