模拟运输振动胁迫对樱桃番茄生理品质和电学特性的影响

The Effect of Simulated Transportation Vibration Stress on Physiological Quality and Electrical Characteristics of Cherry Tomatoes

为研究振动胁迫对樱桃番茄采后品质的影响,本研究选取无损伤、成熟度相同、大小一致的樱桃番茄,分别采用2 Hz(CL1)和3 Hz(CL2)两种振动频率处理模拟不同运输路况,以未处理为对照组(CK),10 h后,将樱桃番茄置于8℃贮藏,每隔3 d对3组樱桃番茄的生理指标和电学特性进行测定。结果表明,振动胁迫对樱桃番茄采后品质具有明显影响。随着贮藏天数的增加,在生理品质方面,与CK组相比,经过振动处理后的相对电导率、可溶性固形物、丙二醛、抗坏血酸、过氧化氢含量在CL1组差异显著(P<0.05)、CL2组差异极显著(P<0.01);电学特性方面,与CK组相比,振动处理组CL1和CL2的并联等效电容(Cp)上升趋势明显,并联等效电阻(Rp)、复阻抗(Z)下降趋势明显。生理品质和电学特性的变化幅度均表现为CL2>CL1>CK。振动频率越大,樱桃番茄的生理品质和电学特性受到的破坏程度越明显。对生理品质和电学特性的相关性分析发现,可滴定酸含量和相对电导率与电学特性相关性最高,说明电学特性可以用于生理品质的检测。本研究结果可为减轻物流运输过程中樱桃番茄生理品质损伤和电学特性的品质检测提供理论依据。

To study the effect of vibration stress on the quality of cherry tomatoes after harvest,cherry tomatoes with undamaged,uniform mature,and same size were selected.The fruits were placed on a vibration test bench and treated at two vibration frequencies[i.e.,2 Hz(CL1)and 3 Hz(CL2)]to simulate different transportation road conditions.The untreated fruits were used as control(CK)sample.After 10 h of treatment,the cherry tomatoes were stored at 8℃.The physiological indicators and electrical characteristics of these cherry tomatoes were measured in an interval of 3 days.Results showed that vibration stress had great impact on the postharvest quality of cherry tomatoes.With the storage prolonging,the groups of CL1 and CL2 showed significant differences(P<0.05)in soluble solids,acetaldehyde,relative conductivity,ascorbic acid,and hydrogen peroxide compared to the CK group.The differences in the CL2 group were extremely significant(P<0.01).In addition,compared to the CK group,the equivalent parallel capacitance(Cp)values of the vibration-treated CL1 and CL2 groups increased dramatically,while the equivalent parallel resistance(Rp)and complex impedance(Z)values decreased.The changes in both physiological quality and electrical characteristics were observed in the order of CL2>CL1>CK.The study indicated that the higher of vibration frequency,the more pronounced damage to the physiological quality and electrical characteristics of cherry tomatoes.According to correlation analysis of physiological quality and electrical characteristics,it was found that titratable acidity and relative conductivity had the highest correlation with electrical characteristics.This may indicate that electrical characteristics can be used for the detection of physiological quality.Overall,this study provided a theoretical basis for mitigating physiological quality damage and quality testing of electrical characteristics during the logistics and transportation of cherry tomatoes.