Antioxidant profiling of native Andean potato tubers (Solanum tuberosum L.) reveals cultivars with high levels of beta-carotene, alpha-tocopherol, chlorogenic acid, and petanin.
The antioxidant profile of 23 native Andean potato cultivars has been investigated from a human nutrition perspective. The main carotenoid and tocopherol compounds were studied using high-performance liquid chromatography coupled with a diode array detector (HPLC-DAD) and a fluorescence detector, respectively, whereas polyphenols (including anthocyanins in colored tubers) were identified by means of both HPLC-mass spectrometry and HPLC-DAD. Antioxidant profiling revealed significant genotypic variations as well as cultivars of particular interest from a nutritional point of view. Concentrations of the health-promoting carotenoids, lutein and zeaxanthin, ranged from 1.12 to 17.69 microg g(-1) of dry weight (DW) and from 0 to 17.7 microg g(-1) of DW, with cultivars 704353 and 702472 showing the highest levels in lutein and zeaxanthin, respectively. Whereas beta-carotene is rarely reported in potato tubers, remarkable levels of this dietary provitamin A carotenoid were detected in 16 native varieties, ranging from 0.42 to 2.19 microg g(-1) of DW. The amounts of alpha-tocopherol found in Andean potato tubers, extending from 2.73 to 20.80 microg g(-1) of DW, were clearly above the quantities generally reported for commercial varieties. Chlorogenic acid and its isomers dominated the polyphenolic profile of each cultivar. Dark purple-fleshed tubers from the cultivar 704429 contained exceptionally high levels of total anthocyanins (16.33 mg g(-1) of DW). The main anthocyanin was identified as petanin (petunidin-3-p-coumaroyl-rutinoside-5-glucoside). The results suggest that Andean potato cultivars should be exploited in screening and breeding programs for the development of potato varieties with enhanced health and nutritional benefits.
Andre
Christelle M
CM
Institut des Sciences de la Vie, Université catholique de Louvain, Louvain-La-Neuve, Belgium. andre@lippmann.lu
Oufir
Mouhssin
M
Guignard
Cédric
C
Hoffmann
Lucien
L
Hausman
Jean-François
JF
Evers
Danièle
D
Larondelle
Yvan
Y
D000872:Anthocyanins / Q000032:analysis; D000975:Antioxidants / Q000032:analysis*; D002726:Chlorogenic Acid / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000032:analysis; D010636:Phenols / Q000032:analysis; D035281:Plant Tubers / Q000737:chemistry*; D059808:Polyphenols; D011198:Solanum tuberosum / Q000737:chemistry*; D013020:South America; D021241:Spectrometry, Mass, Electrospray Ionization; D024502:alpha-Tocopherol / Q000032:analysis; D019207:beta Carotene / Q000032:analysis
D000872:Anthocyanins; D000975:Antioxidants; D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols; D019207:beta Carotene; D002726:Chlorogenic Acid; D024502:alpha-Tocopherol