Effect of chitosan treatments on quality parameters of fresh refrigerated swordfish (Xiphias gladius) steaks stored in air and under vacuum conditions

• Published in: International journal of food microbiology 2012-10, Vol.159 (2), p.101-106
• Main Authors: Tsiligianni, Maria, Papavergou, Eikaterini, Soultos, Nikolaos, Magra, Taxiarhoula, Savvaidis, Ioannis N.
• Format: Article
• Language: English
• Subjects: Air; Animals; Antimicrobials; Bacteria - drug effects; Chitosan; Chitosan - pharmacology; Enterobacteriaceae; Food Packaging - methods; Food Preservation - methods; Packaging; Perciformes; Pseudomonas; Seafood - microbiology; Shewanella putrefaciens; Swordfish; Taste; Vacuum; Xiphias gladius
• ISSN: 0168-1605; 1879-3460
• DOI: 10.1016/j.ijfoodmicro.2012.08.010

The present study examined the effect of chitosan (1.0% w/v) in combination with packaging on the shelf-life of fresh swordfish steaks. Treatments included the following: A (untreated, control samples stored in air), A-CH (treated with chitosan 1.0% w/v, stored in air), VP (untreated, stored under vacuum packaging) and VP-CH (treated with chitosan, stored under vacuum packaging). VP-CH significantly affected Total Viable Counts (TVC), Pseudomonas spp., H2S-producing bacteria (including Shewanella putrefaciens), lactic acid bacteria and Enterobacteriaceae. Production of TMA-N and TVB-N for A-CH, VP and VP-CH swordfish samples was significantly lower than for control (A) samples at day 8 of storage. Histamine formation for all treatments was low. A-CH and VP-CH resulted in significantly lower levels of putrescine, cadaverine and tyramine (day 8) as compared to A and VP swordfish samples. Results of this study indicate that the shelf-life of swordfish steaks can be extended using, either aerobic or vacuum packaging and in combination with chitosan, by approximately 4 (A-CH), 8 (VP) and 12 (VP-CH) days. Swordfish steaks treated with chitosan and stored under VP were sensorially acceptable up to 17days. The presence of chitosan (A-CH and VP-CH) did not negatively influence the taste of cooked swordfish. ► We studied the effect of chitosan and packaging on the shelf-life of swordfish. ► Chitosan with vacuum packaging significantly affected bacterial growth in swordfish. ► Combined treatments of chitosan and packaging produced low levels of biogenic amines. ► Chitosan with vacuum packaging extended the shelf-life of swordfish by 13days. ► The presence of chitosan did not negatively influence the taste of cooked swordfish.