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Outline
This study aimed to investigate the quality changes of ice-coating red swamp crayfish tails during long-term frozen storage. Ice-coated crayfish tails were considered as the research object, and attributes including sensory evaluation, texture profile analysis (TPA), total volatile basic nitrogen (TVB-N), pH, thiobarbituric acid reactive substances (TBARS), protein carbonyl content, and active sulfhydryl content, were systematically monitored over six months of storage at −18 ℃. Correlation analysis was also conducted based on the research results. The results showed that during the 6-month frozen storage at −18 ℃, the indexes of the cooked crayfish tails with ice coating did not exceed the standard limits, but with the extension of the frozen storage time, the contents of TVB-N, TBARS and carbonyl groups in the tail of crayfish coated with ice increased significantly (P<0.05), and the content of active sulfhydryl groups increased first and then decreased, reaching the peak in the 3rd~4th months of storage, and the hardness and elasticity showed a fluctuating downward trend, and the hardness reached the highest value (3680.48 g) at the 3rd month, while the sensory score decreased significantly (P<0.05), and the quality of fresh products was still retained by 80% of the crayfish after 3 months of storage. Based on the changes of the above indicators, it was determined that the best tasting period of ice-coated crayfish tails was 3 months. According to the correlation analysis, protein degradation and fat oxidation might be the dominant factors contributed to the quality deterioration of ice-coated crayfish tails during frozen storage. This work provided theory basis for the promotion of industrial processed crayfish storage quality.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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