Comparison of nutritional composition between pre- and post- spawning Yangtze River- coilia
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摘要: 对比研究了产卵前后长江刀鲚肉的营养价值以及在产卵过程中营养成分的代谢。结果表明产卵后长江刀鲚肉粗脂肪含量显著降低(p<0.05)。两个时期的鱼肉均含有丰富的脂肪酸,尤其是单不饱和脂肪酸。产卵后大部分不饱和脂肪酸含量显著下降,而饱和脂肪酸所占比例显著上升。不饱和脂肪酸中C17∶1,C20∶4和C18∶2n6c含量下降最多,分别为97.72%,96.67%和88.77%。而C14∶1与C20∶3n6的含量发生显著性上升。产卵前后刀鲚肉中n-3/n-6为7.71、9.32,P/S为0.40、0.60。产卵后氨基酸总量显著高于产卵前(p<0.05),分别为60.00 g/100 g和43.17 g/100 g(干重)。其中半必需氨基酸His含量升高最多,增长了85.12%。产卵前后刀鲚肉AAS值均大于100,EAAI值为157、161。产卵前后K的积累和Na的消减与刀鲚产卵时向淡水洄游的生殖洄游习性相吻合,产卵后Cu和Mn含量显著降低,用于产卵过程中维持卵巢发育。两个时期的刀鲚肉中均含有丰富的Ca。Abstract: The nutritional composition of pre- and post- spawning Yangtze River- coilia meat was investigated to evaluate and compare the nutritional value of Yangtze River- coilia in different physiological periods,and found out the metabolism of nutritional composition during spawning. The results showed that the crude fat content was significantly decreased after spawning( p < 0.05).These two samples both contained such high proportion of fatty acids,especially the monounsaturated fatty acids. The composition of saturated fatty acids was significant increased after spawning,while unsaturated fatty acids composition changed differently. C17 ∶ 1,C20 ∶ 4 and C18∶2n6c dropped a lot among unsaturated fatty acids,which decreased by 97.72%,96.67% and 88.77%respectively.On the other side,the contents of C14∶1 and C20∶3n6 were significantly increased.The n-3 / n-6 ratios of pre- and post- spawning Yangtze River- coilia meat were 7.71,9.32,and the P / S ratios were 0.40,0.60. After spawning,the content of total amino acids was significantly higher. The contents were 60.00 g /100 g and43.17 g /100 g,respectively.The increase of His( as a semi- essential amino acid) was as much as 85.12%,which was the highest. AAS of pre- and post- spawning Yangtze River- coilia meat were all above 100,EAAI were157,161. The accumulation of K and reduction of Na after spawning was coincidence with the migration of Yangtze River- coilia. The Cu and Mn contents decreased significantly after spawning.Meanwhile,Yangtze River- coilia can also provide sufficient contents of Ca.
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Keywords:
- Coilia ectenes /
- spawning /
- fish meat /
- nutritional composition
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