title: Effects of Methanolic Pomegranate Peel Extract on the Chemical, Sensory, Textural, and Microbiological Properties of Gutted Rainbow Trout ( Oncorhynchus mykiss ) during Frozen Storage.
abstract: The effects of methanolic pomegranate peel extract (MPPE) on the quality of gutted rainbow trout ( Oncorhynchus mykiss ) were examined periodically during 6 months of storage at -18°C. Fresh samples were dipped (ratio of fish to liquid, 1:2 [wt/vol]) in sterile water or in sterile water containing 1, 2, or 4% (wt/vol) MPPE and packed in low-density polyethylene pouches. The control and treated samples were analyzed monthly for microbiological, chemical, sensory, and textural characteristics. Microbial growth in samples was significantly reduced by MPPE treatment (P < 0.05). Smaller increases in the values for total volatile base nitrogen, peroxide, and thiobarbituric acid-reactive substances and better oxidative stability were also obtained. Moreover, higher organoleptic scores were recorded. However, regarding the general acceptability, the highest score was achieved in the 1% MPPE group. Greater hardness and chewiness were obtained with 4% MPPE (P < 0.05). Therefore, dipping fish in MPPE can be considered an effective method to extend the shelf life and the overall quality of the product.
authors.affiliation: Department of Food Hygiene and Public Health, School of Veterinary Medicine, Shiraz University, Shiraz 71345-1731, Iran.
authors.forename: Enayat
authors.initials: E
authors.lastname: Berizi
authors.affiliation: Department of Food Hygiene and Public Health, School of Veterinary Medicine, Shiraz University, Shiraz 71345-1731, Iran.
authors.forename: Seyed Shahram
authors.initials: SS
authors.lastname: Shekarforoush
authors.affiliation: Department of Food Hygiene and Public Health, School of Veterinary Medicine, Shiraz University, Shiraz 71345-1731, Iran.
authors.forename: Saeid
authors.initials: S
authors.lastname: Hosseinzadeh
mesh_terms: D000818:Animals; D005519:Food Preservation; D005615:Freezing; D006801:Humans; D029561:Lythraceae; D000432:Methanol; D017686:Oncorhynchus mykiss; D020959:Polyethylene
chemical_list: D020959:Polyethylene; D000432:Methanol
keywords: Oncorhynchus mykiss; Pomegranate peel extract; Rainbow trout