摘要
为研究壳聚糖涂膜以及蛹虫草及其下脚料水提物对生鲜果蔬的保鲜作用,探究了质量分数为1%的壳聚糖(Chi)、蛹虫草水提物(CM)、蛹虫草下脚料提取物(SS)、壳聚糖复合蛹虫草水提物(Chi+CM)和蛹虫草水提物复合蛹虫草下脚料提取物(Chi+SS)5种涂膜剂的抗氧化活性和抑菌能力。结果发现Chi+CM复合涂膜剂的DPPH自由基清除能力较好。抑菌圈实验证明,壳聚糖与蛹虫草水提物结合可提高对革兰氏阳性菌的抑制能力。将5种涂膜剂应用于西葫芦后发现,在6℃条件下冷藏,蛹虫草水提物联合壳聚糖涂膜能减少西葫芦在储藏期间的质量损失,降低褐变以及延缓硬度下降,保持西葫芦的可溶性固形物和抗坏血酸含量,降低MDA含量及延缓POD和PPO酶活的上升,抑制微生物繁殖。
The antioxidant and bacteriostatic activities of five coating agents,including 1%chitosan(Chi),1%Cordyceps militaris water extract(CM),1%Cordyceps militaris waste extract(SS),1%chitosan combined with Cordyceps militaris water extract(Chi+CM)and 1%chitosan with Cordyceps militaris waste extract(Chi+SS),were investigated to study the preservation effects of chitosan coating and water extracts of Cordyceps militaris and its leftovers on the fresh fruits and vegetables.Chi+CM coating agent showed the best DPPH free radical scavenging ability,which also revealed the strongest antibacteria activity in the inhibition zone test.The inhibition of chitosan to Gram-positive bacteria could be enhanced by Cordyceps militaris water extract.When applied to zucchini stored at 6℃,the water extract of Cordyceps militaris combined with chitosan coating was found to reduce the weight loss,browning and hardness decline of zucchini,to maintain the soluble solids and ascorbic acid content,and to reduce the accumulation of MDA,POD and POD activity caused by oxidative stress and oxidative damage.In addition,it could inhibit microbial reproduction during storage.
作者
石浩
张慜
SHI Hao;ZHANG Min(State Key Laboratory of Food Science and Technology,Jiangnan University,Wuxi 214122,China;School of Food Science and Technology,Jiangnan University,Wuxi 214122,China)
出处
《食品与生物技术学报》
CAS
CSCD
北大核心
2020年第10期48-55,共8页
Journal of Food Science and Biotechnology
基金
国家“十三五”重点研发计划项目(2018YFD0700303)。
关键词
壳聚糖涂膜
蛹虫草
西葫芦
保鲜
抑菌性
chitosan coating
Cordyceps militaris
zucchini
preservation
bacteriostasis
