Domestic cooking methods affect the phytochemical composition and antioxidant activity of purple-fleshed potatoes

卷:197

Tian, Jinhu ; Chen, Jianle ; Lv, Feiyan ; Chen, Shiguo ; Chen, Jianchu ; Liu, Donghong ; Ye, Xingqian

Zhejiang Univ

关键词: Purple-fleshed potato;    Domestic cooking;    Phytochemical;    Antioxidant activity;    Correlation;   

DOI  :  10.1016/j.foodchem.2015.11.049

学科分类：食品科学和技术

【 摘 要 】

The effects of domestic cooking methods (boiling, baking, steaming, microwaving, frying, and stir-frying) and a new cooking method (air-frying) on the composition of phytochemicals (phenolics, anthocyanins, and carotenoids) and the antioxidant activity in purple-fleshed potatoes were investigated. Compared with raw potatoes, reductions of 23.59-90.42%, 7.09-72.44%, 7.45-83.15%, and 20.15-76.16% in the vitamin C, total phenolic, anthocyanin and carotenoid contents, respectively, was observed after cooking. Decreases of 7.88%, 21.55%, 22.48, 6.31%, and 61.38% in DPPH radical-scavenging activity was also observed after boiling, steaming, baking, microwaving and stir-frying, respectively, whereas an increase of 30.52% was noted after air-frying. A correlation analysis revealed that the antioxidant activity was in accordance with the total phenolic content and that this activity showed the lowest correlation with the vitamin C content. Among all of the cooking methods investigated in this study, stir-frying retained only slight levels of the phytochemicals and antioxidant activity observed in raw potatoes, whereas steaming and microwaving were able to retain most of the health-promoting compounds found in raw potatoes and may thus be suitable methods for cooking potatoes. (C) 2015 Elsevier Ltd. All rights reserved.