Document Type : Original Manuscript
Authors
1 Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran.
2 Department of Fisheries, Faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran.
Abstract
The objective of this study was to evaluate the freshness of gutted tigertooth croaker stored on refrigerator up to 16 days. Changes during storage were observed with sensory evaluation (Quality Index Methode QIM), pH, total volatile basic nitrogen (TVB-N), thiobarbitoric acid (TBA), and microbiological analyses (total mesophilic and psychrotrophic count). The maximum shelf life of gutted tigertooth croaker stored in refrigerator was determined with loss of freshness (sensorial, physico-chemical and microbiological evaluations). High correlation R2= 0.857 between Quality Index (QI) and storage time was verified. QI ranged from zero (maximum freshness) to 34 (total loss of freshness) and reached the acceptable limit for consumption. The microbiological results showed an increase of mesohilic and psychrotrophic counts along the storage time. TVB-N ranged from 12.55 to 67.70 mg N/ 100g, pH from 5.95 to 7.85, and TBA from 0.70 to 2.16 in the first and 16th day of storage, respectively. It is suggested that gutted tigertooth croaker has to be fresh and acceptable for consumption by cooling up to 12 days.
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