Noorhidayah Ishak
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Preferred name
Noorhidayah Ishak
Official Name
Noorhidayah, Ishak
Alternative Name
Ishak, Noor Hidayah
Ishak, Noorhidayah
Main Affiliation
Scopus Author ID
56785703600
Researcher ID
AAW-6920-2020

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OPTIMIZATION OF DIFFERENT PARAMETERS IN THE SYNTHESIS OF BISPHENOL A IMPRINTED POLYMER VIA PRECIPITATION POLYMERIZATION FOR BISPHENOL A ADSORPTION

2021-12-01 , Nee T.N. , Noorhidayah Ishak , Azalina Mohamed Nasir , Nur Zatul 'Iffah Zakaria , Nor Munirah Rohaizad

Molecularly imprinted polymer (MIP) is used to synthesize receptors and is highly recognized against target molecules. The purpose of the study is to prepare bisphenol A (BPA) imprinted polymer that can be used to adsorb BPA molecules. The MIP was prepared by precipitation polymerization using BPA as a template, methacrylic acid (MAA) as a functional monomer, ethylene glycol dimethacrylate (EGDMA) as a crosslinker, acetonitrile as a solvent, and 1,1'-azobis(cyclohexanecarbonitrile) (AIBN) as an initiator by heating in an oil bath at 60 °C for 20 hours. The influence of several parameters (i.e., the ratio of monomer-template, the amount of crosslinker, and the amount of solvent) on the recognition capability of BPA MIP was investigated using response surface methodology (RSM). The optimal conditions of BPA synthesis are 3 mmol of monomer, 30 mmol of crosslinker, and 35 mL of solvent, which achieved an adsorption capacity of 78.111 mg/g. The MIP and non-imprinted polymer (NIP) were characterized using Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The MIP shows higher selectivity towards BPA compared to other analogs. In conclusion, the particles of imprinted polymer have a great potential in the adsorption of BPA.

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One-pot synthesis of molecular-imprinted membrane for selective extraction of caffeic acid

2020-08-01 , Azalina Mohamed Nasir , Noorhidayah Ishak , Said M.S.M. , Mohd Irfan Hatim Mohamed Dzahir

This research investigated the capabilities of caffeic acid-imprinted membrane (CA-IM) toward the selective extraction of caffeic acid (CA). A simpler surface-imprinted membrane using poly(vinylidene fluoride) as supporting membrane, CA as the template, ethylene glycol dimethacrylate as the cross-linker, and 4-vinylpyridine as the functional monomer was developed. The characterization of the membrane’s surface after the polymerization process was analyzed with Fourier transform infrared spectroscopy and a scanning electron microscope. Molecular modeling showed a ratio of 1:4 for which template/monomer gave the highest at − 18.09 kcal/mol. This indicates that this ratio can form a stable complex and a greater affinity toward CA. Batch rebinding and kinetics were performed and then followed by isotherm and kinetic adsorption modeling. Our results show that CA-IM fitted with Freundlich adsorption model and kinetic adsorption of CA-IM followed the second-order model. The selectivity experiment indicated that the adsorption capacity (1.497 mg/g), distribution coefficients, KD (1.939), and selectivity of polymers to CA were higher than for gallic acid and vanillic acid for CA-IM when compared to NIM. These results demonstrated that CA-IM is a capable and effective material for the selective adsorption and enrichment of CA compounds.

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