Abstract
The purpose of this study was to characterize the peels of a CN1 somatic hybrid obtained from two dihaploid potato lines (Cardinal H14 and Nicola H1) in terms of the health‐promoting phenolic compounds (phenolic acids and anthocyanins). The CN1 hybrid is defined by a pink tuber skin color making it different from the light‐yellow‐skinned “Spunta,” which is the most commonly grown potato cultivar in Tunisia. Oven‐dried peel samples derived from CN1 hybrid and cv. Spunta were ground, and phenolic compounds were extracted with water or methanol for quantification. Lyophilized peels were used for the phenolic acid and anthocyanin analyses. Higher total quantities of phenolic compounds were recovered in methanol extracts compared with water extracts. A slightly higher concentration of phenolic acids (100 mg/100 g DW) was obtained in the lyophilized peels extract of CN1 hybrid than in the cv. Spunta corresponding sample (83 mg/100 g DW). The profiles of the chlorogenic acid isomers were almost identical in both of CN1 hybrid and cv. Spunta. Caffeic acid (CA) and three caffeoylquinic acids (CQAs): 3‐CQA, 4‐CQA, and 5‐CQA, were identified from both genotypes, 5‐CQA being the dominant form in both potatoes. Since the CN1 hybrid has a pink skin color, its anthocyanin profile was also determined. The anthocyanin quantity in the CN1 peels was 5.07 mg/100 g DW, involving six different anthocyanins that were identified within the extract, namely, Pelargonidin‐3‐rutinoside‐5‐glucoside, peonidin‐3‐rutinoside‐5‐glucoside, coumaroyl ester of pelargonidin‐3‐rutinoside‐5‐glucoside, coumaroyl ester of peonidin‐3‐rutinoside‐5‐glucoside, feruloyl ester of pelargonidin‐3‐rutinoside‐5‐glucoside, and feruloyl ester of peonidin‐3‐rutinoside‐5‐glucoside. These results suggest that the peel waste of CN1 somatic hybrid can be considered as a promising source of high‐value compounds for food industry.
Highlights
Potato, the fourth most prominent crop plant after cereals, plays an important role in human diet all over the world (Birch et al, 2012; FAOSTAT 2020)
TA B L E 2 The results of the quantities of phenolic acids and anthocyanins analyzed from lyophilized peel samples of potato cv
Since the health-promoting micronutrients are mainly accumulated between the cortex and skin tissues of tubers, and increased quantities of potatoes are peeled for processing industry, the beneficial compounds with an added value are generally disposed of
Summary
The fourth most prominent crop plant after cereals (maize, rice, and wheat), plays an important role in human diet all over the world (Birch et al, 2012; FAOSTAT 2020). Low levels of other free phenolic acids, vanillic, protocatechuic, ferulic, sinapic, salicylic, syringic, and p-coumaric acids, have been reported in potatoes (Lewis et al, 1998; Del Mar Verde Méndez et al, 2004; Andre et al, 2007; Deuβer et al, 2012) Flavonoids, another group of polyphenols in potato, are divided into six major subclasses; flavones, flavonols, flavanones, catechins (flavanols), anthocyanidins, and isoflavones. The purpose of this study was, to identify and analyze the composition of beneficial compounds (phenolic acids and anthocyanins) and evaluate the potential value-added characteristics of a hybrid potato, which expresses a pink tuber skin color. Thereby, the health-promoting properties of peel wastes can be adequately validated for special market needs
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