Effect of exposure to light on the solanine content of two varieties of potato (Solanum tuberosum) popular in Jordan

An analysis of random samples of potatoes (Solanum tuberosum) from local ma rkets in Jordan showed that many whole tubers had solanine contents above t he recommended level of 20 mg/100 g (fresh weight) of potato, while the max imum level in the skins was 128 mg/100 g. Exposure of two local varieties, Draga and Sponta, to direct or diffuse sunlight generated comparable levels over a 3-week period, but differences between the varieties were significa nt. It is suggested that growers in countries with Mediterranean climates s hould select varieties that generate low levels of solanine, remove the tub ers from the field immediately after harvest and store the crop in the dark . (C) 2001 Elsevier Science Ltd. All rights reserved.