New methods developed to detect, measure potato phytonutrients

May 19, 2010

Potatoes come in all shapes, sizes and colors-including tubers with red, yellow, orange and purple flesh. This diversity also applies to phytonutrients, Agricultural Research Service (ARS) scientists in Prosser, Wash., are discovering.

Together with colleagues, they've devised new analytical procedures for rapidly detecting and measuring phytonutrient concentrations in the tubers. Phytonutrients are plant compounds that are of particular interest for their potential to help diminish the risk of cardiovascular disease, and certain cancers, note Roy Navarre and Chuck Brown, with the ARS Vegetable and Forage Crop Research Unit in Prosser.

Using the new analytic methods, Navarre and Brown profiled the phytonutrient contents of several hundred lines of wild and cultivated potato. For example, their analysis of phytonutrients known as phenolics showed concentrations that ranged from 100 to more than 1,500 milligrams per 100 grams dry weight in the .

One type of phenolic, called chlorogenic acid, is being tested by university cooperators for its potential to lower blood pressure. Also of interest are potatoes with high antioxidant activity, which is credited with helping neutralize cell-damaging molecules in the body called . Some potatoes boast antioxidant levels that rival vegetables such as spinach, Navarre reports.

Explore further: Purple sweet potato means increased amount of anti-cancer components

More information: Read more about the phytonutrient studies, as well as other potato research being conducted by ARS scientists at other locations, in the May/June 2010 issue of Agricultural Research magazine, available online at: www.ars.usda.gov/is/AR/archive/may10/potatoes0510.htm .

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