Title page for ETD etd-07142006-112623

Type of Document Master's Thesis
Author Guerra, Maria Ofelia
Author's Email Address mguerr4@lsu.edu
URN etd-07142006-112623
Title The Effects of Carbonated Marinade on the Shelf Life of Enhanced Pork
Degree Master of Science (M.S.)
Department Animal Science (Animal, Dairy, & Poultry Sciences)
Advisory Committee
Advisor Name Title
Kenneth W. McMillin Committee Chair
Marlene E. Janes Committee Member
Thomas D. Bidner Committee Member
  • modified atmosphere packaging
  • enhanced pork
  • carbon dioxide
Date of Defense 2006-05-30
Availability unrestricted
Brine incorporation into meat products has become a well established practice in the United States. Brines are used to enhance the eating quality of pork by improving its tenderness and juiciness. Carbon dioxide and carbon monoxide have been used in modified atmosphere packaging as antimicrobial agents and color stabilizers, respectively, to increase the shelf life of retail meats. The objective of this experiment was to analyze the effects of incorporating carbon dioxide and carbon monoxide into brine solutions to subsequently inject into raw chilled pork. Pork loins were injected with brine solutions containing 2.27% phosphates, 3.79% salt and dissolved gas mixtures of 20% CO2:80% N2, 80% CO2:20% CO or 100% CO2. Pork loins injected with brine solution containing no gas were used as a control. Chops were packaged in high O2 (20% CO2:80% O2) modified atmosphere packaging (MAP), vacuum, no O2 MAP (20% CO2:80% N2), and overwrap packaging and stored for 28 days at 4C. Pork chops were evaluated every seven days after being displayed under fluorescent light (1200 500 lux) for 48 hrs before evaluation. There were no differences (p ≤ 0.05) in color, percent cook loss, percent drip loss, shear force and total aerobic counts between injection treatments. The change in pH for chops injected with 20% CO2:80% N2 and 80% CO2:20% CO in brine due to the dissolution of carbon dioxide in the tissue was not enough to produce a large bacteriostatic effect. Chops injected with brine containing 80% CO2:20% CO had increased redness when compared with the other samples. Vacuum, high oxygen MAP and no-oxygen MAP increased the shelf life of the pork chops by lowering bacterial growth and maintaining the quality traits for the length of the study as compared with overwrap packages.
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