Is the Household Microwave Recommended to Obtain Antioxidant-Rich Extracts from Lycium barbarum Leaves?

被引:7
|
作者
Pollini, Luna [1 ]
Ianni, Federica [1 ]
Verducci, Giuseppa [1 ]
Blasi, Francesca [1 ]
Cossignani, Lina [1 ,2 ]
机构
[1] Univ Perugia, Dept Pharmaceut Sci, Sect Food Sci & Nutr, Via San Costanzo, I-06126 Perugia, Italy
[2] Univ Perugia, Santa Maria Misericordia Univ Hosp, Ctr Perinatal & Reprod Med, St Andrea Fratte, I-06132 Perugia, Italy
关键词
Lycium barbarum leaves; aqueous infusion; chlorogenic acid; optimization; microwave-assisted extraction;
D O I
10.3390/pr9040656
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Nowadays, much interest is devoted to the extraction of plant materials, considering also their waste and by-products, to obtain antioxidant-rich products. The effect of household microwave-assisted extraction (MAE) on the phenolic content and antioxidant activity of Lycium barbarum leaf extracts was investigated. An experimental design approach was adopted considering solid/liquid ratio (1, 3, and 5 g of leaves in 150 mL water), irradiation time (1, 3, and 5 min), and microwave power (300, 400, and 500 W) as independent variables. These three factors and their interactions were studied to evaluate the effect of MAE conditions on the responses of total phenolic content, antioxidant activity, and chlorogenic acid content. The results showed that the analytical parameters were positively influenced by the solid/liquid ratio and time. On the contrary, microwave power was inversely correlated with the investigated responses. This research revealed that microwave extraction conditions should be carefully monitored to obtain bioactive-rich aqueous extracts with high antioxidant activity. A comparison with household traditional methods showed an unexpected lower phenolic content and antioxidant activity for MAE extract in respect to the decoction and infusion. In fact, it was found that L. barbarum leaf infusion had the best functional properties, regarding the investigated characteristics. The outcome of this study has implications for raising awareness that household preparation conditions strongly affect the health properties of herbal extracts.
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页数:9
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