Changes in Phytochemical Profiles and Biological Activity of Olive Leaves Treated by Two Drying Methods

文献类型： 外文期刊

第一作者： Zhang, Chengcheng

作者： Zhang, Chengcheng;Zhang, Jianming;Xin, Xiaoting;Wu, Qinghang;Li, Ting;Liu, Daqun;Zhu, Shenlong;Niu, Erli

作者机构：

关键词： olive leaves; phenolic compounds; triterpenic acids; biological activities; drying

期刊名称：FRONTIERS IN NUTRITION （ 影响因子：6.59； 五年影响因子：6.873 ）

ISSN： 2296-861X

年卷期： 2022 年 9 卷

页码：

收录情况： SCI

摘要： Olive leaves, which are the most abundant byproducts of the olive industry, offer multiple health benefits. The investigation of the phytochemical profiles and relevant biological activities is an essential step toward transforming these low-value byproducts into value-added ones. This study systematically investigated the phytochemical profiles, antioxidant capacity, and inhibition rates of olive leaves from four cultivars on the alpha-glucosidase, alpha-amylase, and angiotensin-converting enzyme (ACE). The leaves were prepared using two common drying methods, namely, hot air-drying and freeze-drying. A total of 33 bioactive compounds were identified in the olive leaves, namely, 19 flavonoids, 2 phenylethanoids, 2 coumarins, 2 hydroxycinnamic acids, 2 iridoids, and 6 triterpenic acids. Quantification of the bioactive compounds revealed high amounts of polyphenols, especially flavonoids [2,027-8,055 mg/kg dry weight (DW)], iridoids (566-22,096 mg/kg DW), and triterpenic acids (13,824-19,056 mg/kg DW) in the olive leaves. The hot air-dried leaves showed significantly (P < 0.05) higher iridoid (oleuropein and secoxyloganin) content than the fresh leaves, while freeze-drying resulted in significantly (P < 0.05) higher flavonoid aglycone and hydroxytyrosol content. Additionally, freeze-drying led to samples with the highest radical scavenging, alpha-amylase, alpha-glucosidase, and ACE inhibition abilities. The flavonoid (e.g., quercetin, luteolin, eriodictyol, kaempferol-7-O-glucoside, and luteolin-7-O-glucoside), hydroxytyrosol, and oleanolic acid contents in the olive leaves were positively correlated (P < 0.05) with their bioactive potentials.

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