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The effects of varying gas concentrations and exposure times on colour stability and shelf-life of vacuum packaged beef steaks subjected to carbon monoxide pretreatment
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2018-12-31
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Lauren Anne Van Rooyen, Paul Allen, Caragh Kelly-Rees, David. I. O’Connor, The effects of varying gas concentrations and exposure times on colour stability and shelf-life of vacuum packaged beef steaks subjected to carbon monoxide pretreatment, Food Packaging and Shelf Life, Volume 18, 2018, Pages 230-237, ISSN 2214-2894, https://doi.org/10.1016/j.fpsl.2018.10.010.
Abstract
The aim of this study was to assess the effects of a range of carbon monoxide (CO) concentrations and exposure times on the colour stability and shelf-life of vacuum packaged Longissimus thoracis et lumborum (LTL) beef steaks. Steaks were exposed to five pretreatments: 0 (Control), 0.4, 1, 3 and 5% CO combined with 60% CO2, (balance N2) for 5, 7 or 24 h. They were then vacuum packed and stored at 2 °C for 28 days. The optimum pretreatment was 1% CO for 5 h as this enhanced initial desirable colour yet allowed discolouration to reach unacceptable levels (a* = 12, C* = 16) by the use-by-date (28 days). K/S ratios verified that the optimum CO pretreatment does not mask spoilage. All CO pretreatments had no effect on pH or purge loss (P > 0.05). Reducing the CO concentration and decreasing the exposure time achieved a desirable colour, without masking spoilage, thereby minimizing the processing time and improving the safety of workers.