红肉火龙果贮藏期间气味监测及桃吉尔霉对气味的影响

目的 监测贮藏条件下火龙果挥发性气味变化及桃吉尔霉(Gilbertella persicaria)侵染果实后气味的改变。方法 以红肉火龙果“紫红龙”为实验材料, 采用电子鼻对室温贮藏条件下火龙果和接种G. persicaria病原菌后的火龙果的挥发性气味变化进行检测。对不同传感器的响应值进行主成分分析(principal component analysis, PCA)、线性判别分析(linear discriminant analysis, LDA), 并通过载荷分析(loading analysis, LA)明确了传感器的贡献率。结果 PCA和LDA均能准确判别出火龙果果实在贮藏期间的挥发性气味变化以及果实被G.persicaria侵染后气味的改变, 载荷分析方法显示出W1S和W1W传感器在火龙果贮藏期间起主要作用, 而在识别病原菌感染后气味改变时起作用的主要是W1W和W2W传感器。结论 电子鼻检测技术可以快速区分火龙果果实贮藏时间及G. persicaria侵染后果实气味的变化。

Odor monitoringduring storageof red pitaya and effect of Gilbertella persicariaon odor

Objective To monitorthevolatile odor changeof pitaya during storage time at ambient temperature and study the effect of Gilbertella persicariaon odor of fruits. Methods Taking dragon fruit (Hylocereusundatus cv. Zihonglong) as test material, theodor of good fruit and infested fruit with G. persicaria were analyzed by electronic nose.Principal component analysis (PCA) and linear discriminant analysis (LDA) were performed on the response values of different sensors. The contribution rate of the sensor was determined by load analysis (LA). Results Both PCA and LDA could accurately discriminate the volatile odor changes of pitaya fruit during storage and the change of odor infested fruit by G. persicaria. The results of load analysis method showed that the W1S and W1W sensors played a major role during the storage of dragon fruit, and the W1W and W2W sensors were mainly used to identify the changes in odor after pathogen infection. Conclusion Electronic nose detection technology can quickly distinguish the storage time of pitaya fruit and the change of fruit odor after G. persicariainfection.