Effect of beef long-storage under different temperatures and vacuum-packaging conditions on meat quality, oxidation processes and microbial growth.

Abstract

Global beef market demands the meat industry to ensure product quality and safety in markets that are often very distant. The present study aimed to evaluate the effects of chilled (CH, 120 d) and chilled-then-frozen (CHF, 28 d + 92 d) storage conditions of beef vacuum packaged (VP) and vacuum packaged with antimicrobial (VPAM) on meat quality, oxidative status, and microbial loads. Treatments resulted from the combination of storage condition and packaging type: VP+CH, VP+CHF, VPAM+CH, and VPAM+CHF. Warner-Bratzler shear force values decreased in all treatments after 28 d of chilling. Except for the VP+CH, L* values (lightness) of meat color did not differ in each treatment as the storage time increased. Meat from VP+CH had greater a* values than CHF treatments on day 120 of storage. Consumer's panel did not detect differences in tenderness, flavor and overall liking between VP and VPAM beef, but they preferred CHF steaks rather than CH beef. TBARS values did not differ between VP and VPAM and between CH and CHF at any time during the storage period. At the end of storage time, all treatments except VP+CHF presented a greater concentration of thiols than 48 h post-mortem. On day 120 of storage, VP+CH had greater catalase enzyme activity than CHF treatments while VP+CH and VP+CHF showed a greater superoxide dismutase activity than VPAM+CHF. Storage condition (CH or CHF) had a greater impact on microbial counts than the type of packaging. Freezing meat after an ageing period represents a suitable strategy to extend beef storage-life without a detrimental impact on its quality. This article is protected by copyright. All rights reserved.