Abstract
Polyvinyl alcohol (PVA)-Fe3O4 composite has been developed as a membrane receptor on chemical sensors to detect monosodium glutamate (MSG). Membranes are made from a mixture of PVA, Fe3O4, MSG, glutaraldehyde and citric acid. Based on the FTIR spectrum, the results showed that glutaraldehyde functions as a cross-linker and citric acid as a catalyst. In addition, citric acid affects the ability of the membrane to absorb of water. The performance of the MSG sensor is influenced by the levels of citric acid and MSG in the membrane. The best performance of MSG sensor is produced on sensors with membrane composition as follows: 70.6% PVA; 0.7% Fe3O4; 0.5% MSG, 12.5% glutaraldehyde; and 15.7% citric acid. The sensitivity of the MSG sensor is influenced by pH at 4-7 and the kind of electrolyte. The sensitivity of the best MSG sensor is 33.25 mV/decade in the range of 10−5-10−1 M concentration, at pH 5 and response time of 180 seconds.
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