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pH and thermal stability of anthocyanin-based optimised extracts of Romanian red onion cultivars

Author

Listed:
  • Simona OANCEA

    (Department of Agricultural Sciences, Food Industry and Environmental Protection, Lucian Blaga University of Sibiu, Sibiu, Romania)

  • Olga DRĂGHICI

    (Department of Agricultural Sciences, Food Industry and Environmental Protection, Lucian Blaga University of Sibiu, Sibiu, Romania)

Abstract

Total phenolics and anthocyanins in ten samples of Romanian red onion cultivars, extraction optimisation and pH/thermal stability were investigated. Extraction with 80% aqueous ethanol leads to an increased anthocyanin yield. The level of phenolics and anthocyanins in bulbs is highly variable and was found higher in the Red of Turda cultivar. The highest value of 99.66 mg/100 g FM was obtained for red onion dry skins. Strong acidic conditions favoured the better stability of anthocyanin extracts during 10-day storage. The first order rate constant value of anthocyanin degradation during storage calculated at different pH increased almost 17 times when pH increased from 1.0 to 9.0. Results of thermal analysis performed by differential scanning calorimetry showed that temperatures over 45°C already induced anthocyanin degradation in extracts. These results may become useful for establishing the appropriate conditions of processing and storage of anthocyanin-based foods. The obtained data on total phenolics and anthocyanins in Allium cepa L. may become relevant for future estimation studies of their daily consumption and for completing the national food composition databases.

Suggested Citation

  • Simona OANCEA & Olga DRĂGHICI, 2013. "pH and thermal stability of anthocyanin-based optimised extracts of Romanian red onion cultivars," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 31(3), pages 283-291.
    • Handle: RePEc:caa:jnlcjf:v:31:y:2013:i:3:id:302-2012-cjfs
    DOI: 10.17221/302/2012-CJFS
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    References listed on IDEAS

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    1. J. Lachman & D. Proněk & A. Hejtmánková & J. Dudjak & V. Pivec & K. Faitová, 2003. "Total polyphenol and main flavonoid antioxidants in different onion (Allium cepa L.) varieties," Horticultural Science, Czech Academy of Agricultural Sciences, vol. 30(4), pages 142-147.
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