Comparison of the Effects of Freezing and Cold Storage on the Shelf Life of Rainbow Trout Caviar Supplemented with Pomegranate Seed and Thyme Oil
Abstract
On roe production, the aim of this study is to examine the change in shelf life of rainbow trout roe that produced by salting method by adding pomegranate seed oil (PSO) and thyme oil (TO) together with the control group (CG) at two different storage temperatures (+4 ⁰C and -18 ⁰C). At 0, 90. and 180. days, heat treated samples analyzed methods including salt content (%) (SC), pH value, coliform bacteria (CB) count, total aerobic bacteria colony count (TAB), Listeria monocytogenes existence, total volatile basic nitrogen (TVB-N) to determine shelf life. At 90th days, under +4 ⁰C, PSO, TO and CG analyzed values respectively for salt content (%) were 3,32±0,71, 3,54±0,36, 3,25±0,40 for TAB count were 7,68 log kob/g, 7,89 log kob/g and 7,96 log kob/g with increasing pH value. At the same time, under -18 ⁰C, PSO, TO and CG analyzed values respectively for salt content (%) 3,81±0,55, 3,63±0,60, 3,29±0,12. At 180th days, under +4 ⁰C, PSO, TO and CG analyzed values respectively for salt content (%) were between 3,45-3,53, for TAB were between 8,77-9,15 log kob/g and pH, TVB-N value significantly increased. In spite of this, under-18 ⁰C, at the end of 180 th day TAB and L. monocytogenes were not detected .in any of the experimental groups, however salt content (%) was 3,53±0,42, 3,54±0,62, 3,60±0,16, and TVB-N value were (5,85-7,64 mg/100g) determined within acceptable limits for consumption. According to the results, it was concluded that the addition of vegetable oil (especially PSO) has a partial positive effect on shelf life parameters at +4°C, but freezing (-18°C) is a more effective method for long-term preservation of roe.
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