不同分子量壳聚糖涂膜贮藏鲫鱼的研究

将不同分子量(M1=1.6×106和M2=3.3×105,脱乙酰度为83.9%)的壳聚糖溶液涂膜于鲫鱼体表,观察壳聚糖对食品的保鲜作用。结果表明,涂膜能明显抑制需氧细菌、厌氧菌的繁殖,延缓挥发性盐基氮的增加。在4℃贮藏条件下,鲫鱼的一级鲜度保藏期较对照组可延长1～2d,二级鲜度延长3d左右,并且分子量较大的壳聚糖的抑菌效果比分子量较小的壳聚糖的抑菌效果好。

Coatings with different molecular weig ht chitosan on the surface of crucian carp could effectively retard the increase in total volatile base -nitrog en(TVB -N),aerobic,anaerobic bacterial counts.The shelf -life of the coated samples were prolong ed1-2days for the first g rade freshness and3days for the second g rade freshness.The results also showed that the antibiotic effects of coating s with hig her molecular weig ht chitosan(M 1 =1.6×10 6 )were more effective than the coating s with lower molecular chitosan(M 2 =3.3×10 5 ).