Sustainable and effective approach to recover antioxidant compounds from purple tea (Camellia sinensis var. assamica cv. Zijuan) leaves

文献类型： 外文期刊

第一作者： de Moura, Cristiane

作者： de Moura, Cristiane;Kabbas Junior, Tufy;Cruz, Thiago Mendanha;Marques, Mariza Boscacci;do Carmo, Mariana Araujo Vieira;Azevedo, Luciana;Deolindo, Carolina Turnes Pasini;Daguer, Heitor;Xu, Yong-Quan;Granato, Daniel

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关键词： Zijuan purple tea; Phenolic compounds; Antioxidants; Cell viability; Antihemolytic effect; reactive oxygen species

期刊名称：FOOD RESEARCH INTERNATIONAL （ 影响因子：8.1； 五年影响因子：7.7 ）

ISSN： 0963-9969

年卷期： 2023 年 164 卷

页码：

收录情况： SCI

摘要： Camellia sinensis var. assamica cv. Zijuan (purple tea) is known for its content of anthocyanins, flavan-3-ols, and bioactivities. This study aimed to verify the influence of solvent polarity, in a solid-liquid extraction, on the content of phenolic compounds and chlorophylls, instrumental color, and antioxidant activity. Different pro-portions of water and ethanol (0:100, 25:75, 50:50, 75:25, and 100:0 v/v) were used for extraction. The results showed that the hydroalcoholic extract (75 % ethanol + 25 % water) had the highest contents of total flavonoids, total anthocyanins, chlorophyll A, and total carotenoids, as well as presenting the highest color intensity, pro-portion of yellow pigments, and antioxidant activity (total reducing capacity and scavenging of the DPPH free radical). Twenty-two compounds were identified, with chlorogenic acid, hesperidin, (-)-epicatechin, (-)-epi-gallocatechin gallate, and isoquercitrin being the main phenolics. This phenolic-rich extract inhibited lip-operoxidation induced in egg yolk homogenate (IC50 = 455 mg/L), showed no hemolytic behavior when human erythrocytes were subjected to osmotic stress, and exerted in vitro cytotoxic effects against cancer and hybrid cells. The extract obtained with the mixture of non-toxic solvents presented critical bioactivities, as well as a comprehensive identification of phenolic compounds in the cultivar, and has potential to be used in technological applications.

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