高压静电场协同低温保鲜对莴笋贮藏品质影响及新鲜度的电子鼻无损检测研究

Study on storage quality effects of Lectica sativa L. by high-voltage electrostatic field synergistic low temperature preservation and the non-destructive detection of freshness by electronic nose

目的研究高压静电场(high-voltage electrostatic field,HVEF)协同低温保鲜对莴笋贮藏品质的影响以及电子鼻对莴笋新鲜度的无损检测。方法本研究以新鲜莴笋茎为研究对象,4℃协同HVEF冷藏保鲜为实验组,4℃常规冷藏保鲜为对照组,测定其贮藏期间感官评分、呼吸速率、硬度、失重率、色差、叶绿素含量和磁共振成像(magneticresonanceimaging,MRI),同时利用电子鼻结合主成分分析(principalcomponent analysis,PCA)和线性判别分析(lineardiscriminantanalysis,LDA)研究贮藏过程中不同新鲜度莴笋的挥发性气味变化。结果HVEF组莴笋贮藏期可达35d。贮藏期间莴笋呼吸速率得到抑制,硬度、色泽、叶绿素、水分等品质得到较好的保持,PCA和LDA对不同新鲜度莴笋均有良好的区分效果。结论HVEF协同低温保鲜能够减缓莴笋品质劣化,延长贮藏期;电子鼻结合PCA和LDA可对不同新鲜度莴笋进行区分,对莴笋贮藏过程中的无损检测具有重要意义。

Objective To study the effects of high-voltage electrostatic field(HVEF) combined with low-temperature preservation on the storage quality of Lectica sativa L. and the non-destructive detection of Lectica sativa L. freshness by electronic nose. Methods In this study, fresh Lectica sativa L. was taken as the research object, the experimental group was refrigerated at 4℃ with HVEF, and the control group was kept fresh at 4℃without HVEF. The sensory score, respiration rate, firmness, weight loss rate, color difference, chlorophyll content,and magnetic resonance imaging(MRI) of Lectica sativa L. in different treatment groups were measured during storage. At the same time, electronic nose combined with principal component analysis(PCA) and linear discriminant analysis(LDA) were used to study the volatile odor changes of Lectica sativa L. with different freshness during storage. Results The storage period of Lectica sativa L. in the HVEF group was up to 35 days. During the storage period, the respiration rate of Lectica sativa L. in the HVEF group was inhibited, and the quality of firmness, color,chlorophyll, and moisture were well maintained. PCA and LDA had good distinguishing effects on Lectica sativa L.with different freshness. Conclusion HVEF combined with low temperature preservation can slow down the quality deterioration of fresh Lectica sativa L. and prolong the storage period. The electronic nose combined with PCA and LDA can distinguish Lectica sativa L. with different freshness, which is of great significance to the non-destructive testing of Lectica sativa L. during storage.