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首页> 外文期刊>Journal of food engineering >Determination of the respiration rate parameters of cherry tomatoes and their joint confidence regions using closed systems
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Determination of the respiration rate parameters of cherry tomatoes and their joint confidence regions using closed systems

机译：使用封闭系统确定樱桃番茄及其联合置信区的呼吸速率参数

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Measuring the respiration rate of fresh produce is essential to design modified atmosphere packaging systems to extend their shelf life. A simple and common way of determining the rates of consumption of oxygen and production of carbon dioxide is to measure their variation in a closed system. In this work the respiration rate of cherry tomatoes was measured in a closed system at 5, 10, 15 and 20 degrees C. The results could be explained by a constant and temperature independent respiratory quotient (1.20 +/- 0.01) and a Michaelis-Menten (M-M) model. The analysis of the joint confidence region showed that the two M-M parameters have a very high collinearity, where data of one single temperature set can provide misleading values. The results showed that parameter KM could be considered independent of temperature but only has statistical significance at higher temperatures, while V-M varied with temperature with a stronger curvature than an Arrhenius model would suggest, with a parabolic functionality giving excellent results, albeit with no linear term, thus having the same number of parameters as an Arrhenius equation. This was due to a small increase in the rate between 5 and 10 degrees C. The data analysis clearly showed the importance of assessing the joint confidence region to ensure robust respiration rate model parameters. (C) 2017 Elsevier Ltd. All rights reserved.
机译：测量新鲜农产品的呼吸速率对于设计气调包装系统以延长其保质期至关重要。确定氧气消耗速率和二氧化碳产生速率的一种简单而通用的方法是测量它们在封闭系统中的变化。在这项工作中，在5、10、15和20摄氏度的密闭系统中测量了樱桃番茄的呼吸速率。其结果可以用恒定且与温度无关的呼吸商（1.20 +/- 0.01）和Michaelis- Menten（MM）模型。联合置信区域的分析表明，两个M-M参数具有非常高的共线性，其中一个温度设置的数据可能会提供误导的值。结果表明，可以认为参数KM与温度无关，但仅在较高温度下才具有统计意义，而VM随温度变化而具有比Arrhenius模型更强的曲率，尽管没有线性项，但抛物线形函数可以提供出色的结果，因此参数数量与Arrhenius方程相同。这是由于5到10摄氏度之间的速率略有增加。数据分析清楚地表明了评估关节置信区域以确保可靠的呼吸速率模型参数的重要性。 （C）2017 Elsevier Ltd.保留所有权利。

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