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Your search keyword '"Kamarudin, Siti Fatimah"' showing total 2 results
Start Over Author "Kamarudin, Siti Fatimah" Topic polyvinylidene fluoride
2 results on '"Kamarudin, Siti Fatimah"'

1. Development of quercetin imprinted membranes-based PVDF substrate.

Author

Kamarudin, Siti Fatimah, Ahmad, Mohd Noor, Mohamed Dzahir, Irfan Hatim, Ishak, Noorhidayah, and Ab Halim, Nurul Farhanah

Subjects
*IMPRINTED polymers, *QUERCETIN, *MOLECULAR imprinting, *POLYVINYLIDENE fluoride, *ADSORPTION isotherms, *POLYMERS
Abstract

Molecular imprinting becomes the most outstanding approach in providing predetermined selectivity to the molecule of interest through the introduction of artificial recognition sites within the polymer matrix. This study presents the fabrication of quercetin-imprinted membranes (QIMs) for selective extraction of quercetin through surface imprinting polymerization method. Polyvinylidene fluoride (PVDF) membrane was used as the polymer support for the thermal polymerization process to take place and subsequent removal of quercetin from resultant polymer matrix leaves behind specific cavities that are complementary to the size, shape and functionality of quercetin molecules. QIMs and non-imprinted membranes were synthesized to evaluate and characterize the differences with respect to their morphology, chemical functionality as well as their binding behaviour towards quercetin and other components. The confirmation on the presence of imprinted layer on PVDF membrane was done through FTIR, FESEM and AFM analysis. Modelling of isotherm and kinetic adsorption also was performed to provide detailed insight into the adsorption mechanism of quercetin to the membranes. Membrane selectivity test was carried out using sinensetin and rosmarinic acid as competitive components. [ABSTRACT FROM AUTHOR]

Published
2019
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2. Novel Approach for Extraction of Quercetin Using Molecular Imprinted Membranes.

Author

Kamarudin, Siti Fatimah, Ahmad, Mohd Noor, Dzahir, Irfan Hatim Mohamed, Nasir, Azalina Mohamed, Ishak, Noorhidayah, and Halim, Nurul Farhanah

Subjects
*MOLECULAR imprinting, *QUERCETIN, *ARTIFICIAL membranes, *POLYVINYLIDENE fluoride, *TETRAHYDROFURAN, *POLYMERIZATION
Abstract

Quercetin imprinted membrane (QIM) was synthesized and applied for the extraction of quercetin. The quercetin imprinted membranes (QIM) were fabricated through a non-covalent approach via surface thermal polymerization. Polyvinylidene fluoride (PVDF) microfiltration membrane was used as a support to improve mechanical stability of the membrane. The thin imprinted layer was formed by copolymerization of acrylamide (AA) as functional monomer and ethylene glycol dimethacrylate (EGDMA) as crosslinker in the presence of quercetin as template in tetrahydrofuran (THF) solution. The Atomic Force Microscopy (AFM) and Field Emission Scanning Electron Microscope (FESEM) were used to visualize the surface of membrane. Batch rebinding and binding kinetic experiments proved that the binding properties of the QIM are higher than non-imprinted membranes (NIM). QIM also have higher selectivity towards quercetin compared to sinensetin and rosmarinic acid. [ABSTRACT FROM AUTHOR]

Published
2017
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