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Oyster preservation by high-pressure treatment.

Author(s) : LÓPEZ-CABALLERO M. E., PÉREZ-MATEOS M., MONTERO P., et al.

Type of article: Article

Summary

The purpose of this study was to analyze the effect of 10-min continuous pressure and pulsed pressure in two 5-min steps (400 MPa at 7 °C) on the microbial flora, total volatile bases, pH, and texture of purified and unpurified oysters. High-pressure treatment reduced the number of all the target microorganisms (total viable count, H2S-producing microorganisms, lactic acid bacteria, Brochothrix thermosphacta, and coliforms), in some cases by around 5-log units. The difference between the counts in the control and the pressurized oysters remained stable throughout 41 days of storage at 2 °C. No Salmonella spp. were detected in either the control batch or the pressurized batches during this storage period. Deterioration of the oyster was accompanied by increased total volatile bases, mainly in the unpressurized samples. The pH was practically constant in pressurized oysters and fell slightly in unpressurized samples. Shear strength values were higher in pressurized than in unpressurized oysters. Step-pulse pressurizing (400 MPa at 7 °C in two 5-min pulses) thus produced no apparent advantages over continuous pressurizing.

Details

  • Original title: Oyster preservation by high-pressure treatment.
  • Record ID : 2001-1480
  • Languages: English
  • Source: Journal of Food Protection - vol. 63 - n. 2
  • Publication date: 2000/02
  • Document available for consultation in the library of the IIR headquarters only.

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