Synthesis and sorption performance of highly specific imprinted particles for the direct recovery of carminic acid |
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Authors: | Noor Shad Bibi Leonardo Galvis Mariano Grasselli Marcelo Fernández-Lahore |
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Institution: | 1. Downstream BioProcessing Laboratory, School of Engineering and Science, Jacobs University, Campus Ring 1, D-28759 Bremen, Germany;2. Laboratorio de Materiales Biotecnológicos, Depto. de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Sáenz Peña 352 (B1876BXD) Bernal, Argentina |
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Abstract: | Carminic acid (CA) is a colorant of natural origin, which is demanded by the food, cosmetic, and pharmaceutical industries. In this work, a selective finite bath process was developed based on the utilization of molecularly imprinted polymeric particles. Such adsorbent was synthesized in a (porous) particle shaped form employing methacrylic acid (MAA) and 4-vinylpyridine (4Vpy) as monomers and ethylene glycol dimethacrylate (EDGMA) as a cross-linker. The imprinted particles were characterized by surface area, surface charge and pore size determination. The adsorption behavior of CA on such a material followed a Langmuir–Freundlich isotherm. Maximum capacity at equilibrium reached 0.64 mmol/g (316 mg/g) and maximum available binding sites 1.8 mmol/g (917 mg/g) were observed for an association coefficient value of 1.5 mM?1. Further, the imprinting factor; showing the strength of interaction of CA to the polymer, was calculated as 13 while the selectivity factor depicted a value of 15. The data presented indicates that the imprinted adsorbent could be conveniently utilized for the recovery of CA, from cochineal extract, in the finite bath mode of operation. |
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