Bioactive compounds, processing quality and yield of colored flesh potato clones

English. ABSTRACT Colored flesh potatoes contain high concentrations of phytochemicals, such as phenolic acids, anthocyanins and carotenoids, which have therapeutic effects and promoters of human health. The objective of the study was to evaluate the concentration of bioactive compounds and industrial quality and yield traits of potato tubers. Four experiments were carried out in Pelotas-RS. In 2012 and 2013, tuber yield traits were evaluated and in 2014 and 2015, the bioactive compounds (phenolic compounds, anthocyanins and carotenoids), antioxidant activity and industrial quality traits [glucose content, dry matter (%) and frying color] were assessed. Clones C2715-01-09, C2721-22-09 and C2743-01-09, having fully pigmented purple flesh presented high concentrations of bioactive compounds and high antioxidant capacity and reasonable processing quality traits and yield potential. Clone C2743-09-09 with white flesh interspersed with purple was the most productive and had good processing attributes, but showed lower levels of bioactive compounds and moderate antioxidant activity when compared to completely purple clones.

Portuguese. RESUMO Batatas com polpa colorida contêm elevadas concentrações de fitoquímicos, tais como ácidos fenólicos, antocianinas e carotenoides, que apresentam efeitos terapêuticos e promotores da saúde humana. O objetivo deste estudo foi avaliar a concentração de compostos bioativos, e caracteres de qualidade industrial e de rendimento de tubérculos de batata de polpa colorida. Quatro experimentos foram realizados em Pelotas-RS. Em 2012 e 2013, avaliaram-se os caracteres de rendimento de tubérculos, e em 2014 e 2015, avaliaram-se os compostos bioativos (compostos fenólicos, antocianinas e carotenoides), atividade antioxidante e caracteres de qualidade industrial (teor de glicose, porcentagem de massa seca e cor de fritura). Os clones C2715-01-09, C2721-22-09 e C2743-01-09, de polpa roxa intensa, apresentaram elevadas concentrações de compostos bioativos e alta capacidade antioxidante, e razoáveis características de processamento e potencial produtivo. O clone C2743-09-09, de polpa branca entremeada com roxo, foi o mais produtivo e mostrou bons atributos de processamento, porém teores inferiores de compostos bioativos e moderada atividade antioxidante quando comparado aos clones completamente roxos.