Gamma irradiation of air-dried olive leaves: Effective decontamination and impact on the antioxidative properties and on phenolic compounds

被引：20

作者：

Aouidi, Fathia ^{[1
,3
]}

Ayari, Samia ^{[1
,2
]}

Ferhi, Hana ^{[1
]}

Roussos, Sevastianos ^{[3
]}

Hamdi, Moktar ^{[1
]}

机构：

[1] Univ Carthage, Natl Inst Appl Sci & Technol INSAT, Lab Microbial Ecol & Technol, Dept Biol & Chem Engn, Tunis 1080, Tunisia

[2] Natl Ctr Nucl Sci & Technol CNSTN, Tunis 2020, Tunisia

[3] Univ Paul Cezanne, Mediterranean Inst Ecol & Palaeoecol UMR CNRS IRD, FST St Jerome, IMEP Case 441, F-13397 Marseille 20, France

来源：

FOOD CHEMISTRY | 2011年 / 127卷 / 03期

关键词：

Olive leaf; Gamma irradiation; D-10-value; Phenolic compound; Antioxidant capacity; MICROBIAL LOAD; STABILITY; EXTRACTS; INDUCTION; STORAGE; HERBS;

D O I：

10.1016/j.foodchem.2011.01.109

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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.

引用

页码：1105 / 1113

页数：9

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