期刊
CARBOHYDRATE POLYMERS
卷 206, 期 -, 页码 57-64出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.10.102
关键词
Chiral adsorption; Chitosan films; Enantioseparation; Interaction chiral
资金
- ANPCYT PICT 2013 grant [0367]
- PROICO grant [2-2116 UNSL]
- CONICET grant [PIP 448]
Sorption of L- and D-Tyrosine (Tyr) from aqueous solutions on chiral membranes of chitosan (CH) was studied. A high adsorption in the membrane, with a marked enantioselectivity to L-Tyr, was found. Computational calculations carried out by docking and molecular dynamics (MD) showed a difference in the affinity of the enantiomers and two regions of adsorption in the polymer matrix. The interactions of the enantiomers with the polymer matrix were studied by using FTIR, DRx, DSC and TG measurements. These results indicate that adsorption of Tyr reduces the crystallinity of the membrane and generates a rearrangement of the chains, decreasing the intercatenary spacing. Also, it was observed that the hydrated polymorph to anhydrous polymorph ratio has changed during adsorption, that is, water bound to chitosan is also modified. The energy balance of the system hydrogen bonding, desolvation and the conformational changes resulted in a spontaneous and endothermic process.
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