纳他霉素壳聚糖复合涂膜对兰州百合鳞茎片的保鲜效果

Effects of natamycin and chitosan coating compounds on freshkeeping of Lanzhou lily bulb during storage

为了探讨纳他霉素壳聚糖复合涂膜对食用百合鳞茎片的保鲜效果,以不同质量分数(0.025%、0.05%和0.1%)的纳他霉素复合质量分数1%的壳聚糖溶液对兰州百合鳞茎片进行涂膜处理,然后置于4℃条件下贮藏,并定期对其腐烂指数、失重率、褐变度、PPO、POD活性、VC、可溶性糖和蛋白质含量等品质相关指标进行测定。结果表明:纳他霉素壳聚糖复合涂膜处理能显著降低兰州百合鳞茎片贮藏期间的腐烂指数和失重率,并抑制丙二醛含量和褐变度的升高,减缓VC、可溶性糖和可溶性蛋白质含量的降低,从而保证了百合鳞茎片贮藏期间的品质,其中0.1%纳他霉素和1%壳聚糖复合涂膜处理的保鲜效果最好,贮藏15 d后,与对照相比,腐烂指数、失重率和褐变度分别降低了48.50%,56.92%和17.52%,而VC、可溶性糖和蛋白质含量分别提高了63.92%,28.54%和25.84%。

Effects of natamycin and chitosan coating compounds on freshness of Lanzhou lily bulb were investigated during storage. Lanzhou lily bulb slices were treated with different concentration of natamycin（ 0. 025%,0. 05%and 0. 1%） ＋ 1% chitosan coating compounds and stored at（ 4 ± 0. 5） °C. The rot index,weight loss,MDA content,the degree of browning,polyphenol oxidase（ PPO） activity,peroxidase（ POD） activity,vatamin C content,soluble sugar and soluble protein content were determined for quality evaluation. The results showed that compared with the control,Natamycin and Chitosan treated lily bulbs had significant changes in the followings： the rot index and the rate of weight loss were significantly reduced,the increase of MDA content and the degree of browning were inhibited,the loss of vitamin C,soluble sugar,soluble protein were delayed. Among all of the treatments,0. 1% natamycin and 1% chitosan coating compounds was the best. Compare to the control,after stored for 15 days,the rot index,the rate of weight loss,and the degree of browning were deduced 48. 50%,56. 92 % and 17. 52% respectively;the content of vatamin C,soluble sugar and soluble protein increased 63. 92%,28. 54% and 25. 84% respectively.