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Photooxidation of Cinnamaldehyde in Methanol — Product  Analysis and Evolving Factor Analysis of UV Spectra

M. Čeppan, R. Fiala, V. Brezová, J. Panák, and V. Motlíková

Department of Printing Technology and Applied Photochemistry, Faculty of Chemical Technology, Slovak Technical University, SK-812 37 Bratislava


Abstract: The photooxidation of cinnamaldehyde in methanol was studied by GC/MS, TLC, and UV absorption spectroscopy in the λ = 200-350 nm region. TLC indicates four components of the reaction mixtures. These components were identified by GC/MS as trans- and cis-cinnamaldehyde and trans- and cis-dimethyl acetal of cinnamaldehyde. Set of the UV absorption spectra of the photooxidation reaction mixtures was analyzed by the Evolving Factor Analysis. Three spectra of components were isolated and the compositions of the reaction mixtures were determined. The isolated spectra correspond to trans- and cis-cinnamaldehyde and dimethyl acetal of cinnamaldehyde. On the basis of the determined compositions of reaction mixtures Principal Components Regression calibration model of the UV spectra set was developed.

Full paper in Portable Document Format: 481a25.pdf


Chemical Papers 48 (1) 25–30 (1994)

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