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Study and modelling the respiration of corn seeds (Zea mays L.) during hermetic storage
Biosystems Engineering ( IF 5.1 ) Pub Date : 2021-06-05 , DOI: 10.1016/j.biosystemseng.2021.05.009
Facundo J. Marcos Valle , Analía Gastón , Rita M. Abalone , Diego A. de la Torre , Claudia C. Castellari , Ricardo E. Bartosik

The dynamics of oxygen (O2) and carbon dioxide (CO2) concentrations were characterized in corn (Zea mays L.) seed hermetically stored in glass jars at 15, 25 and 35 °C and 14.3, 16.5 and 18.3% moisture content. Gas concentration curves were modeled with linear and exponential correlations and the respiration rate was calculated for each temperature and MC combination as storage time progressed and O2 was consumed. Three predictive respiration models were proposed: Model I, dependent on temperature and MC, and Model IIA, dependent on temperature and oxygen (fitted for each MC level), and Model IIB, dependent on temperature, MC and O2. All models were validated with two independent sets of experimental data. Respiration rate increased with MC and temperature, and it appeared that O2 concentration affected respiration only after a critical limit of about 1% was reached. The values of respiration rates obtained in this study were from 1.36 to 823.76 mg O2 kgDM1 d−1 and from 0.83 to 1265.62 mg CO2 kgDM1 d−1. Respiration rate substantially increased for aw conditions greater than 0.85, presumably due to the onset of the embryo's metabolic activity and the activation of the facultative microorganisms. Literature data was provided to support this observation. Based on this study, Models I and IIB could be indistinctly used in simulation models for predicting O2 and CO2 evolution of hermetically stored seed. However, model IIB provides the advantage of attenuation of the respiration rate as O2 is depleted.



中文翻译:

玉米种子(Zea mays L.)在密封储存期间呼吸作用的研究和建模

氧气 (O 2 ) 和二氧化碳 (CO 2 ) 浓度的动态在玉米 ( Zea mays L.) 种子中进行了表征,该种子密封储存在玻璃罐中,温度为 15、25 和 35 °C,水分含量为 14.3、16.5 和 18.3%。气体浓度曲线用线性和指数相关性建模,随着储存时间的延长和 O 2 的消耗,计算每个温度和 MC 组合的呼吸速率。提出了三种预测呼吸模型:模型 I,取决于温度和 MC,模型 IIA,取决于温度和氧气(适用于每个 MC 水平),以及模型 IIB,取决于温度、MC 和 O 2. 所有模型均使用两组独立的实验数据进行验证。呼吸速率随着 MC 和温度的增加而增加,似乎只有在达到约 1% 的临界极限后,O 2浓度才会影响呼吸。本研究中获得的呼吸速率值为 1.36 至 823.76 mg O 2 公斤DM-1d -1和 0.83 至 1265.62 mg CO 2 公斤DM-1d -1。在大于 0.85的w条件下,呼吸率显着增加,这可能是由于胚胎代谢活动的开始和兼性微生物的激活。提供了文献数据来支持这一观察。基于这项研究,模型 I 和 IIB 可以模糊地用于预测密封储存种子的O 2和 CO 2演化的模拟模型。然而,模型 IIB 提供了呼吸率衰减的优势,因为 O 2耗尽。

更新日期:2021-06-05
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