Wang Lang-Hong, Li Zhongyan, Qin Jiale, Huang Yanyan, Zeng Xin-An, Aadil Rana Muhammad
Guangdong Provincial Key Laboratory of Intelligent Food Manufacturing, School of Food Science and Engineering, Foshan University, Foshan, China.
College of Food Science and Technology, Northwest University, Xi'an, China.
Front Nutr. 2022 Dec 7;9:1064812. doi: 10.3389/fnut.2022.1064812. eCollection 2022.
The aim of this work was to investigate the effects of dielectric barrier discharge-air cold plasma (DBD-ACP, 15-35 kV, 2-12 min) on the quality of foxtail millets. The and * values were evaluated by a digital colorimeter representing that the color of millets was significantly changed at 25 kV for 4-12 min or at 35 kV for 2-12 min. The results were consistent with the change of total yellow pigment in millets, indicating that DBD-ACP damaged the carotenoids if the treatment condition was too high. The activity of lipoxygenase and lipase, involving the oxidation and hydrolysis of lipids of millet, decreased significantly induced by DBD-ACP. For example, the lipoxygenase and lipase activity of Mizhi millet was decreased from 44.0 to 18.7 U gmin, 56.0-15.1 U/(mg pro) (<0.05) after being exposed to 25 kV for 2-12 min, respectively. Changes of color, lipoxygenase and lipase activity, and malondialdehyde content of millets were determined during accelerated storage (40 ± 2°C and 75% Relative Humidity) for 15 days after being treated by DBD-ACP under 15 and 25 kV for 4 min. Results showed that millets treated by DBD-ACP at 15 kV kept a better color with lower malondialdehyde content, and lower lipoxygenase and lipase activity compared to control. This work implied that DBD-ACP is an underlying approach for the storage of foxtail millets.
本研究旨在探讨介质阻挡放电-空气冷等离子体（DBD-ACP，15-35 kV，2-12分钟）对谷子品质的影响。通过数字色差仪评估L*、a和b值，结果表明，在25 kV处理4-12分钟或35 kV处理2-12分钟时，谷子颜色发生显著变化。这一结果与谷子中总黄色素的变化一致，表明如果处理条件过高，DBD-ACP会破坏类胡萝卜素。涉及谷子脂质氧化和水解的脂氧合酶和脂肪酶活性因DBD-ACP处理而显著降低。例如，米脂谷子在25 kV下处理2-12分钟后，脂氧合酶和脂肪酶活性分别从44.0降至18.7 U/g min、56.0-15.1 U/（mg pro）（P<0.05）。在15和25 kV下处理4分钟后，对谷子进行加速贮藏（40±2°C，相对湿度75%）15天，测定其颜色、脂氧合酶和脂肪酶活性以及丙二醛含量的变化。结果表明，与对照相比，15 kV下DBD-ACP处理的谷子颜色更好，丙二醛含量更低，脂氧合酶和脂肪酶活性更低。本研究表明，DBD-ACP是一种潜在的谷子贮藏方法。
