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  • Title: Fluorescence sensor using a molecularly imprinted polymer as a recognition receptor for the detection of aluminium ions in aqueous media.
    Author: Ng SM, Narayanaswamy R.
    Journal: Anal Bioanal Chem; 2006 Nov; 386(5):1235-44. PubMed ID: 16947006.
    Abstract:
    This paper describes the investigation of a molecularly imprinted polymer (MIP) as a sensing receptor for Al(3+) ion detection by using an optical approach. Al(3+) ion was adopted as the template molecule and 8-hydroxyquinoline sulfonic acid ligand as the fluorescence tag. The polymer was synthesised using acrylamide as monomer, 2-hydroxyethyl methacrylate as co-monomer and ethylene glycol dimethracylate as cross-linker. The free radical polymerisation was performed in methanol and initiated by 2,2'-azobisisobutyronitrile at 70 degrees C. The imprinted polymer was fluorometrically characterised using a fibre optic attachment in a self-designed flow-cell. NaF was used to leach the Al(3+) ion from the MIP. The optimum pH for the rebinding of Al(3+) ion with the leached polymer was found to be pH 5 and the fluorescence response was found to be stable within the buffer strength range of 0.05-0.10 M. The fluorescence intensity during Al(3+) ion rebinding was inversely dependent on temperature, and a low interference response (<3%) toward metal ions except for Cu(2+) and Zn(2+) ions was observed. The polymer rebinding repeatability study conducted over 9 cycles with Al(3+) ion (0.8 x 10(-4) M) was found to give an RSD value of 2.82% with a standard deviation of 0.53. The dynamic range of the system was found to be linear up to 1.0 x 10(-4) M Al(3+) ion with a limit of detection of 3.62 microM.
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