title: Chiral separation performance of micrometer-sized monodispersed silica spheres with high protein loading.
abstract: Micrometer-sized monodispersed silica spheres (approximately 360 microm) with high loading of bovine serum albumin (BSA) (approximately 450 mg/g) were prepared as an adsorbent for large-scale chiral separation. The new adsorbent was characterized with scanning electron microscopy (SEM), nitrogen adsorption-desorption isotherms, the mercury intrusion method, infrared spectroscopic analysis, and elementary analysis. The extent of chiral separation was tested with rac-tryptophan (rac-Trp) and rac-phenylalanine (rac-Phe) as solutes. The results showed that the absorbent exhibited a high surface area, large pore volume, and bimodal macromesoporous structures, enabling fast mass transfer and high separation efficiency. A fast adsorption rate, reaching equilibrium in less than 6 min, and a high degree of chiral separation, with the enantiomer excess (e.e.) value reaching as high as 100% in the first 10 min, was observed in a small (5 cm in height, 0.46 cm in internal diameter) packed column that could be regenerated with a pH 5.0 HAc-NaAc buffer. The results show that monodispersed silica spheres with a high BSA loading have great potential for applications in large-scale chiral separation processes.
authors.affiliation: Department of Chemical Engineering, The State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing, People's Republic of China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhai
authors.forename: Yang
authors.initials: Y
authors.lastname: Chen
authors.forename: Yu-Jun
authors.initials: YJ
authors.lastname: Wang
authors.forename: Guang-Sheng
authors.initials: GS
authors.lastname: Luo
mesh_terms: D000042:Absorption; D000327:Adsorption; D000818:Animals; D002417:Cattle; D002623:Chemistry Techniques, Analytical / Q000379:methods; D008832:Microchemistry; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D010649:Phenylalanine / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013237:Stereoisomerism; D014364:Tryptophan / Q000737:chemistry
chemical_list: D012710:Serum Albumin, Bovine; D010649:Phenylalanine; D012822:Silicon Dioxide; D014364:Tryptophan