South African Journal of Chemistry
On-line version ISSN 1996-840X
Print version ISSN 0379-4350
LI, Pengfei et al. Selective Adsorption of Tetrahydropalmatine by a Molecularly Imprinted Polymer with Modified Rosin Cross-linker. S.Afr.j.chem. (Online) [online]. 2014, vol.67. ISSN 1996-840X.
A molecularly imprinted polymer (MIP) containing a phenanthrene skeleton was prepared by suspension polymerization with ethylene glycol maleic rosinate acrylate (EGMRA) as the cross-linker, tetrahydropalmatine (THP) as the template, and methacrylic acid as the functional monomer. A non-imprinted polymer (NIP) was similarly prepared and treated, but in the absence of THP The MIP and NIP were characterized by scanning electron microscopy and nitrogen sorption and thermal gravimetric analyses. The time taken by the MIP to reach THP (C0 = 2.8 mmol L1) adsorption equilibrium was 4.5 h, and the recognition factor of the MIP for THP was 2.09. The change in microcalorimetric heat flow during adsorption revealed that the MIP had a higher affinity to THP compared with NIP. Selective adsorption experiments demonstrated the high affinity and THP selectivity of the MIP.
Keywords : Molecularly imprinted polymer; tetrahydropalmatine; selective adsorption; microcalorimetry; modified rosin.