| Issue |
E3S Web Conf.
Volume 207, 2020
25th Scientific Conference on Power Engineering and Power Machines (PEPM’2020)
|
|
|---|---|---|
| Article Number | 01020 | |
| Number of page(s) | 7 | |
| Section | Thermal Equipment, Heat and Mass Transfer Processes | |
| DOI | https://doi.org/10.1051/e3sconf/202020701020 | |
| Published online | 18 November 2020 | |
Thermodynamic investigations of the copigmentation process between strawberry anthocyanins and rose petal polyphenols (Rosa damascena Mill.) at different temperatures
1 Sofia Technical University, branch Plovdiv, Mathematics, Physics and Chemistry Department, 4002 Plovdiv, Bulgaria
2 University of Food Technologies, Department of Food Preservation and Refrigeration Technology, 4002 Plovdiv, Bulgaria
3 University of Food Technologies, Analytical andPhysicochemical Department, 4002 Plovdiv, Bulgaria
* Corresponding author: ivalinapetrova.com@abv.bg
In this study the model systems between strawberry anthocyanins as pigment and rose polyphenols as copigment was investigated. The solutions were prepared from 1:2 to 1:10 pigment:copigment. The addition of increasing concentrations of rose petal polyphenols resulted in a gradual increase of hyperchromic effect. The absorption was determined at heating system from 20 to 50 oC and following cooling the same system from 50 to 20 oC. All calculated thermodynamic parameters were negative. The copigmentation reaction was determined as spontaneous, exothermic and thermally reversible.
© The Authors, published by EDP Sciences, 2020
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