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Influence of storage at 4°C on the stability of high hydrostatic pressure treated onion

Author

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  • José L. VÁZQUEZ-GUTIÉRREZ

    (Research Group of Food Microstructure and Chemistry, Department of Food Technology, Universitat Politècnica de València, Valencia, Spain)

  • María HERNÁNDEZ-CARRIÓN

    (Research Group of Food Microstructure and Chemistry, Department of Food Technology, Universitat Politècnica de València, Valencia, Spain)

  • Amparo QUILES

    (Research Group of Food Microstructure and Chemistry, Department of Food Technology, Universitat Politècnica de València, Valencia, Spain)

  • Isabel HERNANDO

    (Research Group of Food Microstructure and Chemistry, Department of Food Technology, Universitat Politècnica de València, Valencia, Spain)

Abstract

The effects of refrigerated storage on the microstructure and physicochemical properties of high hydrostatic pressure (HHP) treated onion were evaluated. Onion was submitted to 100 MPa at 50°C or 400 MPa at 25°C for 5 min, and stored for 28 days at 4°C. Electron microscopy techniques and light microscopy were used for the microstructural study. Total soluble phenolics, soluble protein percentage, and shear force were also studied. HHP treatments affected the cell wall and membrane permeability, favouring the diffusion of soluble material to the apoplast. Storage at 4°C also caused important structural degradation in the HHP-treated samples, which was higher when 400 MPa at 25°C were applied and led to physico-chemical changes during the first week of storage. Interactions between phenolics and solubilised cell wall material or proteins could explain the decrease in soluble phenolics and proteins during storage.

Suggested Citation

  • José L. VÁZQUEZ-GUTIÉRREZ & María HERNÁNDEZ-CARRIÓN & Amparo QUILES & Isabel HERNANDO, 2014. "Influence of storage at 4°C on the stability of high hydrostatic pressure treated onion," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 32(1), pages 96-101.
    • Handle: RePEc:caa:jnlcjf:v:32:y:2014:i:1:id:471-2012-cjfs
    DOI: 10.17221/471/2012-CJFS
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