Abstract
Novel polyaniline-pectin (PAN-PEC) composite sensing films were prepared for optical pH measurement. Box–Behnken experiment design and the response surface method were used to optimize the PAN-PEC synthesis to produce films with a maximum color change response to pH change in the pH range of 2 to 12. The pH sensing PAN-PEC nanoparticles for incorporation in the sensing film were made by oxidative polymerization of aniline using ammonium persulfate as the oxidant and pectin as the stabilizer. The experimental factors were the quantity of aniline, the concentration of hydrochloric acid, and the mass of ammonium persulfate in the reaction mixture, for a fixed quantity of pectin. A relationship between spectrophotometric absorption at 420 nm and the pH was developed for estimating the pH of the samples.
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