کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1168716 | 960602 | 2009 | 9 صفحه PDF | دانلود رایگان |

Due to the strong involvement in numerous biochemical processes, the separation and resolution of amino acids is a continuously challenging task. Among the experimental parameters affecting the performances in a Chiral Ligand-Exchange Chromatography (CLEC) environment, the effect of the copper(II) salt counter-ion has received very limited attention. Aimed at evaluating the Cu(II) counter-ion effect upon the overall chromatographic performances when the S-trityl-(R)-cysteine is adopted as the chiral selector for the coated stationary phase, a number of both organic (acetate, formate, trifluoromethane-sulfonate) and inorganic (bromide, chloride, nitrate, perchlorate, sulfate) salts has been engaged for the enantiomer separation of a selected set of aliphatic (Allo-Ile, Ile, Leu, Nor-Leu, Nor-Val, Val) and aromatic (AIDA, ATIDA, His, Phe, Phg, Tyr) amino acids. By varying the physico-chemical nature of the Cu(II) anion, a pronounced impact upon the resolution factor (RS) has been observed. Even if to a lesser extent, the enantioseparation factor values (α) underwent variation, as well. A molecular modelling investigation has also been carried out as a rationalization attempt of the observed chromatographic outcomes.
Journal: Analytica Chimica Acta - Volume 638, Issue 2, 13 April 2009, Pages 225–233