Effects of Plasma Treatment on the Endogenous Enzyme Activity and Quality of Foxtail Millet
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Abstract:
The effects of dielectric barrier discharge-atmospheric cold plasma (DBD-ACP) on the lipoxygenase and lipase activities and the physiochemical properties (chromaticity, total yellow pigment content, and DPPH free radical scavenging capacity) of foxtail millet (Mizhi, Shaanxi) were investigated. DBD-ACP was found to have a significant inactivation effect on the activities of endogenous enzymes in foxtail millet (p<0.05). For example, treatment at a voltage of 25 kV for 12 min decreased the relative activities of lipoxygenase and lipase to 31.15% and 25.22%, respectively. The chromaticity indicators (L and b*) of millet did not change significantly (p>0.05) after DBD-ACP treatment under 15 kV and 25 kV for 12 min; whereas increasing the voltage to 35 kV under the same treatment time led to a significant increase in the L value from 58.27 to 62.68, and a decrease in the b* value from 43.06 to 38.74 (p<0.05). These results were consistent with the changes in the total yellow pigment content of foxtail millet, indicating that the DBD-ACP treatment had a certain destructive effect on the pigment components in millet at excessively high voltages. The changes in the DPPH scavenging ability, malondialdehyde (MDA) production, and morphology of foxtail millet were further studied. The results showed that there were no significant changes in DPPH scavenging ability, MDA production, and morphology of foxtail millet after DBD-ACP treatment (p>0.05). These results suggest that DBD-ACP can be used for the inactivation of lipoxygenase and lipase, while also maintaining the appearance quality of foxtail millet to some extent. This study provides a theoretical basis for the application of DBD-ACP technology in the inactivation of endogenous enzymes to delay the aging of millet and stabilize its appearance quality.
