The Metabolic Characteristics of Razor Clams (Sinonovacula constricta) During Storage Based on the Analysis of Survival Rate and Quality Change
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Abstract:
The changes of the various indicators of treated during storage under The effects of different temperatures (-4 ± 1℃, 0 ± 1℃, 5 ± 1℃, 10 ± 1℃, 25 ± 1℃) on the change rules and characteristics of survival rate, basic nutritional composition (moisture, glycogen, crude fat, crude protein and ash), biochemical characteristics (total volatile basic nitrogen, pH, SH content and Ca2+-ATPase activity of myofibrillar protein) and the total count of bacteria colonies in Razor Clams (Sinonovaculabsvula constricta). The results showed that the survival time of Razor Clams (Sinonovaculabsvula constricta) was 0 d, 11 d, 9 d, 5 d and 3 d, respectively, under different temperatures. The contents of moisture and crude protein kept stable during storage under different temperatures, meanwhile glycogen and crude fat were firstly consumed as energy source in turn. After 11 days of storage, the reduction of glycogen and crude fat were about 54.86%-69.45% and 21.69%-28.92%, respectively. The pH value was decreased and then increased. The SH content and Ca2+-ATPase activity of myofibrillar protein tended to decrease. The TVB-N value was shown to be increased within the acceptable TVB-N threshold (15 mg/100 g) in Razor Clams on the 11 d, 9 d, 7 d, 5 d, 2 d of storage processes. The total count of bacteria colonies in 7 d, 5 d, 3 d, 2 d was closed to 4.7 log(CFU/g) under different temperature of 0 ± 1℃, 5 ± 1℃, 10 ± 1℃ and 25 ± 1℃. The results indicated that Razor Clams maintained fresh at temperature of (0 ± 1)℃ due to their nutrient loss and change of biochemical characteristics slowly during the keep-alive process.
