Ozone saturation in a column containing peanut kernels and the effect on quality

Summary The objective of this study was to evaluate the ozone saturation process in a column containing peanuts and the effect on product quality. Peanuts with a moisture content of about 6.8% (w.b.) were used, packed in cylindrical PVC containers with 1.10 m in height and 15 cm in diameter. Ozone was injected into the base of the cylindrical column and the corresponding values adopted for the heights of the grain columns were 0.25, 0.50 and 0.75 m. The peanuts were ozonized at concentrations of 1.59 and 2.78 mg L–1, a temperature of 25 °C and a gas flow rate of 5.0 L min–1. The ozone saturation times and concentrations were determined and also the quality of the ozonized peanuts. For peanut kernels ozonated at a concentration of 1.59 mg L–1, saturation times ranging between 222 and 449 min were obtained. Regarding the CSat/C0 ratio, values between 0.32 and 0.48 were obtained. For peanut kernels ozonated at a concentration of 2.78 mg L–1, saturation times between 78 and 251 min were obtained, and the CSat/C0 ratio for an initial concentration of 2.78 mg L-1 was between 0.46 and 0.81. It was concluded from the results that an increase in height of the peanut kernel column resulted in an increased saturation time and decreased saturation concentration. There was no change in product quality during the ozonation process.

研究摘要
本研究旨在评估装填有花生的柱体中的臭氧饱和过程及其对产品品质的影响。实验采用湿基含水率约6.8%的花生，将其装填于高度1.10 m、直径15 cm的圆柱形聚氯乙烯（PVC）容器中。臭氧从该圆柱柱体的底部注入，实验设置的花生柱体高度分别为0.25、0.50和0.75 m。实验分别以1.59 mg·L⁻¹、2.78 mg·L⁻¹的臭氧浓度、25 ℃的反应温度以及5.0 L·min⁻¹的气体流速对花生进行臭氧处理。本研究测定了臭氧饱和时间与饱和浓度，同时检测了经臭氧处理后的花生品质。当臭氧浓度为1.59 mg·L⁻¹时，处理后的花生仁饱和时间介于222至449 min之间，饱和浓度与初始浓度比值（CSat/C0）介于0.32至0.48之间。当臭氧浓度为2.78 mg·L⁻¹时，花生仁的饱和时间介于78至251 min之间，该浓度下的CSat/C0比值处于0.46至0.81范围内。研究结果表明，花生仁柱体高度的提升会延长臭氧饱和时间并降低饱和浓度；臭氧处理过程未对花生产品品质造成显著改变。