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Abstract
A simple, sensitive, and accurate differential pulse polarography method for simultaneous determination of trans-cinnamaldehyde and benzaldehyde in food and drug samples were developed. DC polarography, CV, and coulometric techniques were used for investigation the electrochemical behavior of both compounds. In phosphate buffer (pH = 8.2) and 10% v/v of methanol the differential pulse voltammograms of trans-cinnamaldehyde (−1.05 V) and benzaldehyde (−1.31 V) display reproducible peaks. Under these conditions a strict linearity between both analyte concentrations and their peaks height were observed. The detection limits were calculated to be 2.5 × 10−8 and 1.2 × 10−8 M for trans-cinnamaldehyde and benzaldehyde in pH = 8.2, respectively. The relative standard deviations for 1.0 × 10−6 M of both analytes were 2.04 and 1.18. The heat stability of trans-cinnamaldehyde was studied, and it was found that trans-cinnamaldehyde undergoes a heat-induced decomposition at low temperature (>70°C) to produce benzaldehyde.