No abstract

This study examined the effect of lemon juice on sensory, biochemical and microbiological quality of sous vide (SV)-packaged bonito. Bonitos were salted (0.2%) and divided into two groups. The first group (SV) was vacuum-packaged in a gas barrier plastic pouch, pasteurised (70°C, 10 min) and stored at 4 ± 1°C. The second group [(lemon juice-treated sous vide (LSV)] was treated with lemon juice, vacuum-packaged, pasteurised and stored similarly. LSV samples had lower pH, mesophilic and psychrophilic aerobic counts than SV samples (P < 0.05), and they had better sensory quality. SV samples spoiled on the 35th day, while the LSV samples were acceptable until 49th day of storage. This result shows that treatment with lemon juice increased the acceptability and shelf life of SV packaged bonito for 2 weeks (40%). When compared to several other mild preservation procedures, addition of lemon juice to SV fish is inexpensive and uncomplicated method.

The effect of storage temperature on the shelf life of sous vide packaged (70C, 10 min) whiting was determined. Samples stored at 12 ± 1C spoiled according to sensory test on the 21st day, when mesophilic aerobic bacteria and trimethylamine nitrogen (TMA‐N) exceeded the limits. However, their consumption is not advisable after 15 days because psychrophilic counts exceeded the recommended limits at that day. In cold storage (4 ± 1C) Total volatile basic nitrogen and TMA‐N, values of the samples exceeded the limits on the 42nd day. However, because samples spoiled according to sensory test, and mesophilic and psychrophilic aerobic bacterial counts were above the limits, shelf life was considered as 35 days. Sous vide cooking at 70C for 10 min could extend significantly the shelf life of whiting both at 4C and temperature‐abuse conditions (12C). PRACTICAL APPLICATIONS Sous vide is a long established but relatively little‐known cooking process. The data regarding the effect of storage temperature on the shelf life and quality of sous vide fish are very limited. Therefore, this study aimed to determine the sensory, microbiological and chemical quality of sous vide packaged whiting during refrigerated storage (4 ± 1C) and temperature‐abuse temperature conditions (12 ± 1C). The results of this study can be utilized by researchers in future studies as well as by manufacturers to determine the processing and storage conditions of sous vide fish.

No abstract

The aim of this study was to determine the quality and shelf life of sous vide bonito stored at 4 and 12C. The total volatile basic nitrogen (TVB‐N) values of cold stored samples exceeded the recommended limit on 35th day of storage, while they were unacceptable according to sensory scores. The TVB‐N and trimethylamine‐N values of sous vide samples stored at 12C exceeded the limits at the 18th day, while sensory scores were very close to the acceptability limit. For all samples, mesophilic and psychrophilic bacterial counts exceeded the limits after they were regarded as spoiled. Therefore, the shelf life of the sous vide bonito, cooked at 70C for 10 min, was 28 days at 4C while 15 days at 12C. It was seen that sous vide packaging provided a long shelf life for bonito. PRACTICAL APPLICATIONS Sous vide is a long established but relatively little known cooking process. The data regarding the effect of storage temperature on shelf life and quality of sous vide fish are very limited. Therefore, this study aimed to determine the sensory, microbiological and chemical quality of sous vides packaged bonito during refrigerated storage (4 ± 1C) and abuse temperature conditions (12 ± 1C). The results of this study can be utilized by researchers in future studies as well as by manufacturers to determine the processing and storage conditions of sous vide fish.