Chiral Recognizable Properties of Thermosensitive Poly(NIPA-co-NALPE) Hydrogels
A serious of poly(NIPA-co-NALPE) hydrogels containing chiral group (L-Phenylalanine ethyl ester) were prepared by copolymerization of N-isopropylacrylamide(NIPA) and acrylic acid derivatived L-Phenylalanine ethyl ester (NALPE) in ethanol with different feed ratios. The kinetics adsorption approach, isothermal adsorption and chiral separation experiment of hydrogels on D/L-phenylalanine were investigated, and the results showed that the chiral hydrogels exhibited enantioselectivity for D/L-phenylalanine and the absorption capability increased with the rising temperature and increasing contents of NALPE due to the temperature-sensitive NIPA molecular chains and the chiral monomer NALPE, respectively. Furthermore, the poly(NIPA-co-NALPE) hydrogels were also used to separate DL-alanine and DL-tartaric acid, which suggested that the gels are also applicable to other chiral molecules besides DL-phenylalanine and have potential applications in separation of chiral drugs.
Guojun Zhang and Jessica Xu
J. J. Chen et al., "Chiral Recognizable Properties of Thermosensitive Poly(NIPA-co-NALPE) Hydrogels", Advanced Materials Research, Vols. 160-162, pp. 13-18, 2011