Gamma irradiation of air-dried olive leaves: Effective decontamination and impact on the antioxidative properties and on phenolic compounds
Gamma irradiation of air-dried olive leaves: Effective decontamination and impact on the antioxidative properties and on phenolic compounds
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DOI：
10.1016/j.foodchem.2011.01.109
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发表时间：
2011-08-01
期刊：
影响因子：
8.8
通讯作者：
Hamdi, Moktar
中科院分区：
文献类型：
--
作者：
Aouidi, Fathia;Ayari, Samia;Hamdi, Moktar
橄榄叶因其有价值的酚类化合物而具有抗氧化价值。本研究旨在评估伽马辐照对空气干燥橄榄叶的微生物负荷、抗氧化特性和酚类化合物的影响。对粉末和完整样品施加高达25 kGy（5 kGy间隔）的辐照。伽马辐照后计数总需氧菌、酵母菌和霉菌以及乳酸菌。在20 kGy剂量下进行去污。微生物种群的D-10值在9.74 ~ 25.12kGy之间，具有较高的辐射抗性。此外，高达25 kGy的γ射线辐照被发现保持抗氧化能力，分子量分布的多酚，总酚，邻二酚，黄酮类化合物，橄榄苦苷，毛蕊花苷和芦丁的含量。综上所述，改善空气干燥的橄榄叶的微生物质量，而不影响酚类成分和抗氧化性能，可以成功地通过应用γ射线辐照处理实现。(C)2011爱思唯尔有限公司保留所有权利。
Olive leaves are commercialized for their antioxidative value due to their valuable phenolic compounds. The present study aimed to evaluate the effect of gamma irradiation on microbial load, on antioxidative properties and on phenolic compounds of air-dried olive leaves. Irradiation was applied up to 25 kGy (5 kGy intervals) to powdered and intact samples. Total aerobic bacteria, yeast and mold, and lactic acid bacteria were counted after gamma irradiation. Decontamination was obtained at 20 kGy. The radioresistance of microbial population was high with D-10 values between 9.74 and 25.12 kGy. Besides, gamma irradiation up to 25 kGy was found to maintain the antioxidant capacity, molecular mass distribution of polyphenolics, total phenolics, ortho-diphenols, flavonoids, oleuropein, verbascoside and rutin contents.To conclude, the improvement of the microbial quality of air-dried olive leaves, without affecting phenolic composition and antioxidative properties, can be successively achieved by the application of gamma irradiation treatment. (C) 2011 Elsevier Ltd. All rights reserved.