评估连续干燥和间歇干燥对玉米粒抗倒胺活性的影响

Ana Caroline Raimundini Aranha, Luiz Mário de Matos Jorge, Lilian Tatiani Dusman Tonin, Rafael Oliveira Defendi
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摘要

谷物干燥对于储藏以保持材料质量至关重要。然而,干燥会影响农业材料的成分,因为长期暴露在高温下会降低谷物的质量,包括抗氧化活性和发芽率。这项工作的目的是评估连续和间歇干燥,以最大限度地保存玉米粒的抗氧化潜力。实验温度分别为 40、55 和 70 °C,回火时间分别为 5 和 10 分钟。所用溶剂为甲醇/水 70/30(v/v)、甲醇/水 95/5(v/v)、乙醇/水 70/30(v/v)和乙醇/水 95/5(v/v),萃取时间为 1、4 和 24 小时。采用 DPPH 和 ABTS 自由基清除法进行了抗氧化活性分析,结果表明,甲醇/水 70/30 (v/v) 和 4 小时的天然谷物抗氧化活性最佳。与天然玉米相比,在 40 °C 下间歇干燥 5 和 10 分钟导致的抗氧化活性百分比降低最少。这项研究表明,低温间歇干燥是保存玉米生物活性化合物的有效替代方法。
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Assessment of continuous and intermittent drying on antixidant activity of corn grains
Grain drying is essential for storage to preserve material quality. However, drying can affect the composition of agricultural material, as exposure to high temperatures for long periods can reduce the quality of the grain, in terms of antioxidant activity and germination power. The objective of this work was to assess the continuous and intermittent drying, in order to maximize the preservation of corn grains antioxidant potential. Experiments were conducted at 40, 55, and 70 °C with tempering periods of 5 and 10 minutes. Solvents used were methanol/water 70/30 (v/v), methanol/water 95/5 (v/v), ethanol/water 70/30 (v/v), and ethanol/water 95/5 (v/v) and extraction times of 1, 4, and 24 hours. Antioxidant activity analysis was carried by DPPH and ABTS radicals scavenging and the best results of antioxidant activity for in natura grains were obtained with methanol/water 70/30 (v/v) and 4 h. Intermittent drying of 5 and 10 minutes’ periods at 40 °C led to least reduction of antioxidant activity percentage compared to in natura corn results. This study demonstrated that intermittent drying conducted at low temperatures is an effective alternative to preserve bioactive compounds of corn.
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