Chemical, microbial and sensory changes of silver carp (Hypophthalmichthys molitrix) fish treated with Black cumin (Nigella sativa L.) extract during storage at refrigerator

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Abstract

The changes in chemical, microbial and quality sensory of fillets for silver carp fish treated
with black cumin extract during refrigerated storage were investigated. The fish were divided
into two groups. First group was dipped in black cumin extract with concentration of 1% and
received the highest score in sensory evaluation. Then the fishes were wrapped in
polyethylene package. The second group, as the control samples, were wrapped in
polyethylene package after dipping in distilled water. All treatments were stored at
refrigerator temperature (1±4°C). The microbial tests including total viable count,
psychrotrophic count and chemical tests including peroxide index, thiobarbituric acid, free
fatty acid value and total volatile basic nitrogen, with sensory evaluation, were done at 4°C
over a period of 15 days. The results showed that the black cumin extract delayed lipid
oxidation and protein analyses significantly in treated fishes. Psycrotrophic bacteria and total
viable count of samples being treated with black cumin extract were maintained lower than
the proposed acceptable limit (7 log cfu/g). In comparison to the control samples, microbial
spoilage significantly decreased in treated samples. Furthermore, according to sensory
analysis, the treatment with black cumin extract led to high quality during storage.The
findings indicated that black cumin exerts had strong antioxidant and antibacterial impacts on
silver carp fish, such that the shelf life of fillets being treated with black cumin were 2.5 times
more than that of control samples during storage in refrigerator.

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Iranian Scientific Fisheries Journal
Volume 22, Issue 1 - Serial Number 82
September and October 2013
Pages 71-84

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