Degradation of hydroxycinnamic acid mixtures in aqueous sucrose solutions by the Fenton process

Nguyen, Danny M.T., Zhang, Zhanying, & Doherty, William O.S. (2015) Degradation of hydroxycinnamic acid mixtures in aqueous sucrose solutions by the Fenton process. Journal of Agricultural and Food Chemistry, 63(5), pp. 1582-1592.

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Abstract

The degradation efficiencies and behaviors of caffeic acid (CaA), p-coumaric acid (pCoA) and ferulic acid (FeA) in aqueous sucrose solutions containing the mixture of these hydroxycinnamic acids (HCAs) mixtures were studied by the Fenton oxidation process. Central composite design and multi-response surface methodology were used to evaluate and optimize the interactive effects of process parameters. Four quadratic polynomial models were developed for the degradation of each individual acid in the mixture and the total HCAs degraded. Sucrose was the most influential parameter that significantly affected the total amount of HCA degraded. Under the conditions studied there was < 0.01% loss of sucrose in all reactions. The optimal values of the process parameters for a 200 mg/L HCA mixture in water (pH 4.73, 25.15 °C) and sucrose solution (13 mass%, pH 5.39, 35.98 °C) were 77% and 57% respectively. Regression analysis showed goodness of fit between the experimental results and the predicted values. The degradation behavior of CaA differed from those of pCoA and FeA, where further CaA degradation is observed at increasing sucrose and decreasing solution pH. The differences (established using UV/Vis and ATR-FTIR spectroscopy) were because, unlike the other acids, CaA formed a complex with Fe(III) or with Fe(III) hydrogen-bonded to sucrose, and coprecipitated with lepidocrocite, an iron oxyhydroxide.

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ID Code: 81651
Item Type: Journal Article
Refereed: Yes
Keywords: advanced oxidation process, color precursor, sucrose, sugar juice, hydroxycinnamic acid
DOI: 10.1021/jf504184u
ISSN: 1520-5118
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Research Centres > Centre for Tropical Crops and Biocommodities
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 American Chemical Society
Deposited On: 09 Feb 2015 00:03
Last Modified: 05 Feb 2016 06:59

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