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Food Chem. 2019 Mar 1;275:85-94. doi: 10.1016/j.foodchem.2018.09.097. Epub 2018 Sep 17.

Cultivar-specific responses in red sweet peppers grown under shade nets and controlled-temperature plastic tunnel environment on antioxidant constituents at harvest.

Author information

1
Phytochemical FoodNetwork Research Group, Department of Crop Sciences, Tshwane University of Technology, Pretoria West, 0001, South Africa.
2
Queensland Alliance for Agriculture and Food Innovation, Center for Food Science and Nutrition, The University of Queensland, Australia.
3
Agricultural Research Council - Roodeplaat, Vegetable and Ornamental Plants, Private Bag X293, Pretoria 0001, South Africa.
4
Phytochemical FoodNetwork Research Group, Department of Crop Sciences, Tshwane University of Technology, Pretoria West, 0001, South Africa; Queensland Alliance for Agriculture and Food Innovation, Center for Food Science and Nutrition, The University of Queensland, Australia. Electronic address: SivakumarD@tut.ac.za.

Abstract

Antioxidant constituents such as carotenoids (capsanthin, phytoene, lutein, β-cryptoxanthin), polyphenols content (p-coumaric, ferulic, p-hydroxybenzoic, caffeic acid, sinapic acid, and quercetin-3-glucoside) and marketable yield were investigated in 11 sweet pepper cultivars grown under controlled temperature plastic tunnel and white shade net. Marketable yield was not affected by either of the environments, while the interaction between cultivar and growing environment significantly affected the accumulation of antioxidant constituents. The principal component analysis illustrated that controlled temperature plastic tunnel improved the accumulation of carotenoid components and ascorbic acid and vitamin C content in most cultivars. On the contrary, white shade nets favoured the accumulation of phenolic compounds and ORAC activity in most cultivars. A strong correlation was noted between phytoene and carotenoid components in this study (capsanthin r = 0.60; P < 0.001; lutein r = 0.75; P < 0.001; β-carotene r = 0.78; P < 0.001) while ORAC correlated with phenolic compounds. Based on this study, it is possible to refine the choice of environment and cultivar to enhance individual antioxidant constituent groups to improve health benefits for consumers.

KEYWORDS:

Bioactive compounds; Capsanthin; Capsicum annuum L.; Growing condition; Lutein; Vitamin C

PMID:
30724264
DOI:
10.1016/j.foodchem.2018.09.097
[Indexed for MEDLINE]

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