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.
Institut des Sciences de la Vie, Université catholique de Louvain, Louvain-La-Neuve, Belgium. andre@lippmann.lu
Christelle M
CM
Andre
Mouhssin
M
Oufir
Cédric
C
Guignard
Lucien
L
Hoffmann
Jean-François
JF
Hausman
Danièle
D
Evers
Yvan
Y
Larondelle
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