Abstract The microbial and physicochemical properties of tiger nut milk were studied under different dielectric barrier discharge (DBD) plasma exposure time: 2, 4, 6, 8, and 12 min. Following the plasma treatment, a significant reduction in the microflora was observed at 2, 4, 6 and 8 min treatment time with 12 min reaching the undetectable limit. The treatment did not result in any significant change in soluble solids and fat contents. Significant reduction in pH was recorded after 8 and 12 min treatment, whereas heightened titratable acidity and lipid oxidation were noticed in all the treated samples. The protein content decreased significantly in all the treated samples, while peroxidase activity only decreased when the treatment time was extended beyond 4 min. The loss in enzyme activity was due to the oxidation effect plasma reactive species including atomic oxygen, ozone, and hydroxyl radicals, which might have oxidized the amino acid side chain. The findings presented here could be a prelude for the potential application of DBD plasma treatment of tiger nut milk in the food industry.

中文翻译：

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介质阻挡放电等离子体对虎坚果乳背景菌群及理化性质的影响

摘要 研究了不同介质阻挡放电 (DBD) 等离子体暴露时间：2、4、6、8 和 12 分钟下虎坚果奶的微生物和理化特性。等离子处理后，在 2、4、6 和 8 分钟处理时间观察到微生物群落显着减少，其中 12 分钟达到无法检测的极限。处理没有导致可溶性固体和脂肪含量的任何显着变化。在处理 8 和 12 分钟后，记录到 pH 值显着降低，而在所有处理过的样品中都注意到可滴定酸度和脂质氧化升高。所有处理样品的蛋白质含量均显着降低，而过氧化物酶活性仅在处理时间延长超过 4 分钟时才降低。酶活性的丧失是由于氧化效应等离子体反应性物质，包括原子氧、臭氧和羟基自由基，它们可能已经氧化了氨基酸侧链。这里提出的发现可能是 DBD 等离子体处理虎坚果奶在食品工业中的潜在应用的前奏。