Abstract
Ethylene not only causes food spoilage, but also reacts with ozone to form formaldehyde as a harmful intermediate byproduct. To assess the necessity of reducing formaldehyde formation and the use of air cleaning technologies, such as ultraviolet photocatalytic oxidation technology (UVPCO) or plasma, the formation rate of formaldehyde with different concentrations of ethylene and ozone under cold chain temperatures (1.67/14.00℃) is investigated comprehensively through an experimental study, and the adsorption of formaldehyde on apples and bananas is investigated as well. The results show that ethylene and ozone can react and produce formaldehyde up to 1 ppm under the conditions used in this study, and that formaldehyde can be adsorbed by fruits such as apples and bananas at a stable rate. Finally, two pilot tests are conducted to evaluate UVPCO and plasma technologies for ethylene removal; the results indicated that UVPCO and plasma can effectively remove ethylene. Novelty impact statement This work shows that ethylene and ozone can react and produce formaldehyde up to 1 ppm under the conducted condition in this paper, which can be adsorbed by fruits, such as apples and bananas at a stable rate. Finally, two pilot tests were conducted to evaluate UVPCO and plasma technologies for ethylene removal, and the results indicate that UVPCO and plasma can effectively remove ethylene.
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