title: Enantioselectivity of structurally modified poly(sodium undecenoyl-L-leucinate) by insertion of Triton X-102 surfactant molecules.
abstract: The effectiveness of Triton X-102 (TX-102), as a structural modifier of the polymeric surfactant sodium undecanoyl-L-leucinate (L-SUL) was investigated for enhanced enantiomeric recognition of various chiral compounds in micellar electrokinetic chromatography (MEKC). Increasing concentrations of TX-102 were separately added into the micellar solutions of L-SUL and then polymerized to form poly-L-SUL. The resulting polymers were purified by use of 3500 molecular-weight-cutoff (MWCO) dialysis membranes. Fluorescence and pulsed field gradient-nuclear magnetic resonance (PFG-NMR) techniques were used to elucidate the structural effects of TX-102 on poly-L-SUL. Evaluation of data from fluorescence measurements suggested an increase in polarity with increasing concentration of TX-102. However, the polarity decreased at higher concentrations of TX-102. Evaluation of data from PFG-NMR suggested an increase in hydrodynamic radius upon increasing the concentration of TX-102. The racemates of coumarinic and phenythiohydantoin amino acid derivatives, and pindolol were used as test analytes in MEKC. A notable increase in resolution and capacity factors of the test analytes was observed when the modified poly-L-SUL was used in MEKC measurements. Examination of the data obtained from fluorescence, PFG-NMR, and MEKC suggests a strong correlation between the polarity and the hydrodynamic radii of TX-102 modified micelles and the enantiomeric resolution of the test analytes.
authors.affiliation: Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
authors.forename: Jepkoech
authors.initials: J
authors.lastname: Tarus
authors.forename: Thomasas
authors.initials: T
authors.lastname: Jernigan
authors.forename: Kevin
authors.initials: K
authors.lastname: Morris
authors.forename: Isiah M
authors.initials: IM
authors.lastname: Warner
mesh_terms: D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D003374:Coumarins / Q000737:chemistry / Q000302:isolation & purification; D007930:Leucine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D010669:Phenylthiohydantoin / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification; D010869:Pindolol / Q000737:chemistry / Q000302:isolation & purification; D011092:Polyethylene Glycols; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013237:Stereoisomerism; D013501:Surface-Active Agents
chemical_list: D003374:Coumarins; D011108:Polymers; D013501:Surface-Active Agents; C492696:poly(N-undecenoxycarbonylleucinate); D010669:Phenylthiohydantoin; D011092:Polyethylene Glycols; D010869:Pindolol; D007930:Leucine