Stability of carotenoids, total phenolics and in vitro antioxidant capacity in the thermal processing of orange-fleshed sweet potato (Ipomoea batatas Lam.) cultivars grown in Brazil.
Intervention strategies regarding the biofortification of orange-fleshed sweet potato, which is a rich source of carotenoids for combating vitamin A deficiency, are being developed in Brazil. This study was conducted to evaluate the concentrations of individual carotenoids, total phenolic compounds and antioxidant capacity in the roots of four biofortified sweet potato cultivars that were raw or processed by four common heat treatments. HPLC, Folin-Ciocalteu, DPPH and ABTS assays were used. All cultivars showed high levels of carotenoids in raw roots, predominantly all-trans-β-carotene (79.1-128.5 mg.100 g(-1) DW), suggesting a high estimated vitamin A activity. The CNPH 1194 cultivar reported carotenoids values highest than those of other cultivars (p < 0.05). The total phenolic compounds varied among cultivars and heat treatments (0.96-2.05 mg.g(-1) DW). In most cases, the heat treatments resulted in a significant decrease in the carotenoids and phenolic compounds contents as well as antioxidant capacity. Processing of flour presented the greatest losses of major carotenoids and phenolics. The phenolic compounds showed more stability than carotenoids after processing. There were significant correlations between the carotenoids and phenolic compounds and the antioxidant capacity.
Departamento de Agroindústria, Alimentos e Nutrição, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Av. Pádua Dias 11, Piracicaba, São Paulo, Brazil.
Carlos M
CM
Donado-Pestana
Jocelem
J
Mastrodi Salgado
Alessandro
A
de Oliveira Rios
Priscila Robertina
PR
dos Santos
André
A
Jablonski
D000975:Antioxidants / Q000032:analysis* / Q000494:pharmacology; D052160:Benzothiazoles; D001713:Biphenyl Compounds / Q000378:metabolism; D001938:Brazil; D002338:Carotenoids / Q000032:analysis*; D004032:Diet; D005511:Food Handling / Q000379:methods*; D006358:Hot Temperature; D006801:Humans; D027723:Ipomoea batatas / Q000737:chemistry* / Q000145:classification; D010636:Phenols / Q000032:analysis*; D010851:Picrates / Q000378:metabolism; D018517:Plant Roots / Q000737:chemistry*; D013045:Species Specificity; D013451:Sulfonic Acids / Q000378:metabolism; D013844:Thiazoles / Q000378:metabolism; D014801:Vitamin A / Q000378:metabolism; D014802:Vitamin A Deficiency / Q000517:prevention & control
D000975:Antioxidants; D052160:Benzothiazoles; D001713:Biphenyl Compounds; D010636:Phenols; D010851:Picrates; D013451:Sulfonic Acids; D013844:Thiazoles; D014801:Vitamin A; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; D002338:Carotenoids; C004931:1,1-diphenyl-2-picrylhydrazyl