A1 Journal article – refereed
Improved analysis of anthocyanins and vitamin C in blue-purple potato cultivars




List of Authors: Liz Gutiérrez-Quequezana, Anssi L. Vuorinen, Heikki Kallio, Baoru Yang
Publisher: Elsevier Ltd
Publication year: 2018
Journal: Food Chemistry
Journal name in source: Food Chemistry
Volume number: 242

Abstract

Methods were optimized for extraction and quantification of anthocyanins (ACY) and vitamin C in potatoes. Acidified aqueous methanol (70%) was the optimal extraction solvent and freeze-drying significantly improved the extraction yield of ACY. The content of ACY varied widely in five potato cultivars from 0.42 to 3.18 mg/g dry weight, with the latter being the highest value found in the Finnish cultivar ‘Synkeä Sakari’.

Compared with dithiothreitol (DTT), tris(2-carboxyethyl) phosphine hydrochloride (TCEP) was more efficient in reducing dehydroascorbic acid (DHA) to ascorbic acid (AA) and for quantifying the content of total ascorbic acid (TAA). For raw potatoes, quantification of TAA after treatment with TCEP was more reliable than a direct analysis of AA, whereas AA can be analyzed directly in steam-cooked samples. The TAA contents in the three potato cultivars were around 0.30–0.35 mg/g dry weight. The loss of AA in steam cooking was 24%.


Last updated on 2019-30-01 at 00:05