Abstract
The objective of this study was to evaluate total antioxidant capacity (TAC), total phenolic content (TPH), and the identification of anthocyanidin and polyphenolic compounds in 13 colored potatoes collected from the Andean region of Bolivia, and understand how the chemical composition correlated with the botanical classification and molecular characterization of genes, ans (anthocyanidin synthase) and stan1 (Solanum tuberosum anthocyanidin synthase), associated with the synthesis of anthocyanidins. The results show the existence of a limited correlation between botanical classification, based on morphological identification and polyphenol composition. No association between genetic grouping of the ans and stan genes and botanical classification was found. However, it was possible to identify a correlation between the ans gene clades and the levels of anthocyanidins as well as of other polyphenols. Thus, this result confirms the concept that potato color can be used in the search for high polyphenol potato cultivars.
Highlights
Potatoes accumulate a great variety of secondary metabolites, including polyphenolic and many other phytochemical compounds, as a protection against the adverse effects of solar radiation, and injury of herbivorous insects or pathogens such as bacteria or fungi (Del Mar Verde Mendez et al 2004; Brown 2005)
Thirteen purple potatoes belonging to three species (Solanum curtilobum, S. ajanhuiri, and S. tuberosum subsp. andigenum) (Fig. 2) were harvested in April 2011 during one day at Quipaquipani Research and Training Center (PROINPA Foundation)
total antioxidant capacity (TAC) and total phenolic content (TPH) of colored potatoes are shown in Figure 3, ranging from 1.0 to 7.0 lmol Trolox/g dry weight and 8.0–17.0 lmol GAE/g dw, respectively
Summary
Potatoes accumulate a great variety of secondary metabolites, including polyphenolic and many other phytochemical compounds, as a protection against the adverse effects of solar radiation, and injury of herbivorous insects or pathogens such as bacteria or fungi (Del Mar Verde Mendez et al 2004; Brown 2005). Polyphenolic compounds are able to form stable radicals and thereby act as radical scavengers and antioxidants. Polyphenols are expected to have potentially positive health benefits (Del Mar Verde Mendez et al 2004). Anthocyanidins is a group of polyphenols able to create red, purple, blue, or orange colors (Brown 2005). Tuber parenchyma tissue contained chlorogenic acid and other phenolic acids, plus low concentration of flavonoids.
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