Ethylene degradation via vacuum ultraviolet photolysis: nth-order kinetic model, energy consumption assessment, and a case study for 'Fuji' apples under retail conditions

IF 3.5 2区 农林科学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Food and Bioproducts Processing Pub Date : 2024-07-11 DOI:10.1016/j.fbp.2024.07.006
Bongolwethu P. Mabusela , Buntu Godongwana , Zinash A. Belay , Oluwafemi James Caleb
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Abstract

Effective management of ethylene along the value chain is crucial to the regulation of fruit ripening and senescence to reduce postharvest losses. The objectives of this study were to, (i) investigate the degradation kinetics of ethylene using a vacuum ultraviolet (VUV) photolysis reactor at different light intensity (0.0005 mW/m2, 0.0014 mW/m2 and 0.0021 mW/m2) and relative humidity (RH) levels (20 % and 80 %), and (ii) evaluate the economic feasibility of the VUV photolysis system. Kinetic experiments were performed in batch mode with an initial ethylene concentration of 51 mg L−1. The reaction order and rate constant were determined by employing an nth-order kinetic model. Light intensity and RH significantly influenced the kinetic parameters and ethylene degradation (p < 0.05). At low light intensity, ethylene degradation followed a zero-order kinetic model, while at high intensity, it followed a fractional-order kinetic model. The developed kinetic models accurately predicted the experimental concentrations (R2 = 0.9955). The economic feasibility of the VUV photolysis system was assessed using electrical energy per order (EEO), which remained below 10 kW m-³ order−1, indicating energy efficiency and practical applicability. The chamber equipped with the VUV reactor successfully preserved apple quality (maintaining low TSS/TA ratio and delaying pH increase) during storage for 28 d at 15°C compared to the control. This foundational application of VUV photolysis in ethylene degradation offers promising prospects of upscaling for long-term storage investigation and industry applications.

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通过真空紫外线光解进行乙烯降解:N 次方动力学模型、能耗评估以及零售条件下 "富士 "苹果的案例研究
价值链中乙烯的有效管理对于调节果实成熟和衰老以减少采后损失至关重要。本研究的目的是:(i) 利用真空紫外线(VUV)光解反应器,在不同光照强度(0.0005 mW/m2、0.0014 mW/m2 和 0.0021 mW/m2)和相对湿度(RH)水平(20% 和 80%)下,研究乙烯的降解动力学;(ii) 评估 VUV 光解系统的经济可行性。动力学实验以间歇模式进行,初始乙烯浓度为 51 mg L-1。反应顺序和速率常数是通过 nth-阶动力学模型确定的。光照强度和相对湿度对动力学参数和乙烯降解有明显影响(p < 0.05)。在低光照强度下,乙烯降解遵循零阶动力学模型,而在高光照强度下,乙烯降解遵循分数阶动力学模型。建立的动力学模型准确预测了实验浓度(R2 = 0.9955)。采用每阶电能(EEO)评估了紫外光分解系统的经济可行性,结果显示每阶电能低于 10 kW m-³-阶-1,这表明该系统具有能源效率和实用性。与对照组相比,配备了紫外光反应器的箱体在 15°C 下贮藏 28 d 期间成功地保持了苹果的品质(保持了较低的 TSS/TA 比值并延缓了 pH 值的升高)。紫外线光解在乙烯降解中的这一基础应用为长期贮藏研究和工业应用提供了广阔的升级前景。
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来源期刊
Food and Bioproducts Processing
Food and Bioproducts Processing 工程技术-工程:化工
CiteScore
9.70
自引率
4.30%
发文量
115
审稿时长
24 days
期刊介绍: Official Journal of the European Federation of Chemical Engineering: Part C FBP aims to be the principal international journal for publication of high quality, original papers in the branches of engineering and science dedicated to the safe processing of biological products. It is the only journal to exploit the synergy between biotechnology, bioprocessing and food engineering. Papers showing how research results can be used in engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in equipment or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of food and bioproducts processing. The journal has a strong emphasis on the interface between engineering and food or bioproducts. Papers that are not likely to be published are those: • Primarily concerned with food formulation • That use experimental design techniques to obtain response surfaces but gain little insight from them • That are empirical and ignore established mechanistic models, e.g., empirical drying curves • That are primarily concerned about sensory evaluation and colour • Concern the extraction, encapsulation and/or antioxidant activity of a specific biological material without providing insight that could be applied to a similar but different material, • Containing only chemical analyses of biological materials.
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