In collaboration with Scientific Association of Iranian Medicinal Plants

Document Type : Research Paper

Authors

1 M.Sc., Department of Seafood Processing, Faculty of Fisheries, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

2 Department of Seafood Processing, Faculty of Fisheries, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

3 Ph.D. student, Department of Seafood Processing, Faculty of Fisheries, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Abstract

This research was performed to investigate the effect of rosemary (Rosmarinus officinalis L.) water extract on shelf life of rainbow trout fillet in the refrigerator (4±1ºC) based on total microbial load, chemical evaluation and sensory characteristics. For this reason, the fish were divided into three groups including fish with intravenous injection of rosemary extract at the rate of 0.1% and 0.3% (treatment 2 and 3), intramuscular injection of rosemary extract at the rate of 0.1% and 0.3% (treatments 4 and 5) and non-injected (treatment 1). Fish were caught and filleted 62 hours after injection, then kept for 16 days at refrigerator. During this period, peroxide value (PV), thiobarbituric acid (TBA), free fatty acids (FFA), total volatile nitrogen base (TVB-N) and total bacterial load (TVC) indices were measured every 4 days and also sensory evaluation was performed. According to the results, treatments 3 and 5 showed significant differences (P<0.05) in PV, TBA, FFA, TVB-N and TVC indices in comparison with other treatments. Also there was a significant difference (P<0.05) between treatments 5 and 3 in TVC, TBA, FFA and TVB-N indices, showing a better performance of intravenous injection of rosemary extract (0.3%) compared to intramuscular injection of 0.3%. In addition, the rosemary extract improved sensory properties.

Keywords

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