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Title: | Copigmentation of cyanidin 3-O-glucoside with phenolics: Thermodynamic data and thermal stability |
Authors: | Nattapong Kanha Suthat Surawang Pornsiri Pitchakarn Joe M. Regenstein Thunnop Laokuldilok |
Authors: | Nattapong Kanha Suthat Surawang Pornsiri Pitchakarn Joe M. Regenstein Thunnop Laokuldilok |
Keywords: | Agricultural and Biological Sciences;Biochemistry, Genetics and Molecular Biology |
Issue Date: | 1-Aug-2019 |
Abstract: | © 2019 The intermolecular copigmentation of cyanidin-3-O-glucoside (C3G) with three colorless phenolic compounds and its thermal stability were investigated. The influence of the copigment (ferulic acid, dopamine, or (+)-catechin), the pigment-to-copigment molar ratio (1: 1, 1: 10, and 1: 100), the pH value (pH 3–7), and the temperature (20, 30, 40, and 50 °C) on the copigmentation effect, stoichiometric ratio (n), the equilibrium constant (K), and thermodynamic parameters (ΔG°, ΔH°, and ΔS°) were obtained. The strongest immediate copigmentation reactions were observed at pH 3 and 1: 100 molar ratio, being significantly higher with (+)-catechin, followed by ferulic acid and then dopamine. The greatest hyperchromic shift was found in the complex of C3G/(+)-catechin, which was reasonable for its n and K values of 0.7 and 17.1, respectively. Moreover, the reactions were favored at low temperature. The thermodynamic data indicated that all these complexes were formed by spontaneous exothermic reactions. The C3G/(+)-catechin complex at the molar ratio 1: 100 exhibited the greatest thermodynamic properties, with negative values of ΔG° (−6.92 kJ/mol), ΔH° (−38.7 kJ/mol), and ΔS° (−108.0 J/K/mol). The C3G/(+)-catechin complex exhibited a low Ea value (78 J/mol), indicating greater thermal stability against temperature change compared with those with the other phenolic pigments. In addition, copigmentation of anthocyanins in mulberry juice with (+)-catechin significantly reduced the loss of anthocyanins during pasteurization (80 °C for 15 min). |
URI: | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85065796246&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/65235 |
ISSN: | 22124306 22124292 |
Appears in Collections: | CMUL: Journal Articles |
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