Effect of preservatives on microbial safety and quality of smoked blue catfish (Ictalurus furcatus) steaks during room-temperature storage

Food Microbiol. 2008 Dec;25(8):958-63. doi: 10.1016/j.fm.2008.07.001. Epub 2008 Jul 9.

Abstract

The microbial safety and quality of smoked blue catfish (Ictalurus furcatus) steaks treated with antimicrobials and antioxidants were examined during 6-week ambient storage. Five pre-smoking soaking treatments were applied: 25% NaCl and 1% ascorbic acid for 30 min or 1h, 3% sodium lactate with or without 5% rosemary extract for 30 min, and 5% sorbic acid alone for 30 min. After smoking, cooled catfish steaks were packed and analyzed at 0, 2, 4, and 6 weeks of ambient storage. Neither Listeria nor Salmonella was recovered from the smoked catfish steaks. Significant reductions (P<0.05) in total plate counts were observed in all treated samples, with those treated with 3% sodium lactate carrying the lowest microbial load. The rosemary extract-treated samples were the most stable against oxidation. All treated smoked catfish steaks had water activities less than 0.85; however, neither pH nor water activity changed significantly within each treatment group during storage (P> or 0.05). In conclusion, smoking/cooking effectively reduced microbial populations, and the use of antimicrobial agents and antioxidants, particularly 3% sodium lactate, could aid the control of microbial safety during storage, resulting in safe products for up to 6 weeks without refrigeration.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Ascorbic Acid / pharmacology
  • Consumer Product Safety
  • Food Contamination / analysis
  • Food Contamination / prevention & control
  • Food Handling / methods
  • Food Preservation / methods*
  • Food Preservatives / pharmacology*
  • Humans
  • Hydrogen-Ion Concentration
  • Ictaluridae / microbiology*
  • Oxidation-Reduction / drug effects
  • Plant Extracts / pharmacology
  • Rosmarinus / chemistry
  • Seafood / microbiology*
  • Seafood / standards*
  • Smoke
  • Sodium Chloride / pharmacology
  • Sodium Lactate / pharmacology
  • Temperature
  • Time Factors
  • Water / metabolism

Substances

  • Food Preservatives
  • Plant Extracts
  • Smoke
  • Water
  • Sodium Chloride
  • Ascorbic Acid
  • Sodium Lactate