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Materiale Plastice (Mater. Plast.), Year 2012, Volume 49, Issue 2,





Stefan-Ovidiu Dima, Andrei Sarbu, Tanase Dobre, Violeta Purcar, Cristian-Andi Nicolae Diosgenin Selective Molecularly Imprinted Polymers with Acrylonitrile-methacrylic Acid Matrix


Abstract:
A new set of molecularly imprinted polymers (MIPs), based on acrylonitrile: methacrylic acid (AN:MAA) matrix, selective for diosgenin, was synthesized and characterized. The target molecule, diosgenin, is an important anticancer and antileukemia bioactive compound. The phase inversion method, an emerging and insufficient studied preparation method, was used to prepare 0.5 mm spherical MIPs. Three copolymers of acrylonitrile with methacrylic acid were synthesized by radical copolymerization: AN:MAA 90:10, 80:20 and 70:30 and used for diosgenin imprinting. The imprinted materials were analysed by elemental analysis (EA), attenuated total reflectance infrared spectroscopy (ATR FT-IR), RAMAN spectroscopy, size exclusion chromatography (SEC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and batch rebinding tests. The affinity for the template, expressed as the imprinting factor IF, decreases in the order MIP-AN:MAA-80:20 > MIP-AN:MAA-90:10 > MIP-AN:MAA-70:30, meaning that -COOH functional groups have an important role in the imprinting process. Too much methacrylic groups, however, do not exhibit the highest affinity, maybe due to the steric obstruction of methyl groups and to a less stability of the structure by decreasing the AN ratio. Keywords: molecular imprinting, diosgenin, phase inversion, acrylic copolymers, MIPs



Issue: 2012 Volume 49, Issue 2
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