Abstract
Anthocyanin-rich concentrates from different fruits can be used as natural food colourants. The pigments' stability is comparatively low and dependent on the composition of food matrices. Food ingredients relevant for soft drinks, jelly fruits and salad dressings were tested in model systems regarding their influence on the colour stability of elderberry and black currant concentrate determined by colour measurement (CIE L * a * b *). In aqueous solutions food-grade organic acids and salt were found to influence anthocyanin stability: colour stability increased with increasing pK a of acids and decreased with increasing salt concentrations. This may be attributed to altered solvation characteristics of aqueous solutions. A stabilizing influence was found for sugars presumably by reducing water activity. However, when heat treatment was applied, e.g. in the production of hydrocolloid gels, fructose was shown to accelerate anthocyanin decay due to the formation of sugar degradation products. Comparing hydrocolloids, alginate was shown to increase colour stability in aqueous solution and pectin displayed overall highest colour stability in a gel model system, suggesting that polyuronic acids may improve anthocyanin stability by intermolecular association.
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Acknowledgements
The authors would like to thank Anschi Saß for technical assistance regarding the gel systems. This work was supported by the Commission of the European Communities' Quality of life and management of living sources specific RTD program “Functional Properties, Bioactivities and Bioavailability of Phytochemicals, especially Anthocyanins, from Processed Foods,” QLK1-CT-1999-00124. It does not necessarily reflect its views and in no way anticipates the Commission's future policy in this area. The authors are grateful for the research grant of EMH by the International Foundation for the Promotion of Nutrition Research and Nutrition Education (ISFE).
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Hubbermann, E.M., Heins, A., Stöckmann, H. et al. Influence of acids, salt, sugars and hydrocolloids on the colour stability of anthocyanin rich black currant and elderberry concentrates. Eur Food Res Technol 223, 83–90 (2006). https://doi.org/10.1007/s00217-005-0139-2
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DOI: https://doi.org/10.1007/s00217-005-0139-2