壳聚糖对无水保活单环刺螠品质的影响

Effect of chitosan on the waterless preservation of Urechis unicinctus

目的:降低单环刺螠运输成本,减少单环刺螠营养损失。方法:采用壳聚糖对单环刺螠进行前处理,测定无水保活前、后及复水后3种状态下单环刺螠的主要营养及生理指标变化。结果:壳聚糖保活单环刺螠的较适质量浓度为3 g/L,经壳聚糖前处理后,无水保活64 h后存活率为67%,壳聚糖处理后的试验组其存活率、肌糖原、持水力、水分、乳酸含量均显著性高于对照组(P<0.05);与未复水相比,复水后,试验组和对照组蛋白质、乳酸、脂肪、水分含量均极显著下降(P<0.01)。结论:壳聚糖处理提高了无水保活单环刺螠的存活率及品质。

Objective:The aim of the study was to decrease the transportation cost while reducing the nutrition loss of Urechis unicinctus.Methods:Chitosan was used for pretreatment of Urechis unicinctus,and the changes of the main nutritional and physiological indexes of the three groups i.e.,control group,after waterless preservation group and recovered group,were measured.Results:The optimal concentration of chitosan was 3 g/L.After being pretreated by chitosan,the survival rate of Urechis unicinctus could reach 67%after 64 h of waterless preservation.The survival rate,muscle glycogen,water holding capacity of the experimental group were all significantly higher than those of the control group(P<0.05).Compared with those groups without recovered,the content of crude protein,lactic acid,crude fat,and water were all dramatically decreased after recovered no matter in control group or in experimental group(P<0.01).Conclusion:Chitosan can improve the survival rate and quality of Urechis unicinctus after waterless preservation.This research provides reference for the study on waterless preservation method of Urechis unicinctus,and has certain application research value.