The effect of low-temperature storage on the glycoalkaloid content of potato (Solanum tuberosum) tubers
Griffiths, D.W. | Bain, H. | Dale, M.F.B.
Tubers from six cultivars selected on the basis of their rates of glycoalkaloid accumulation in response to light exposure were stored at 10, 7 and 4 degrees C. After 9 weeks at 10 degrees C a subset from each cultivar was removed and subsequently stored at lower temperatures. Samples were removed after 9, 18 and 24 weeks storage and analysed for their glycoalkaloid content. At all temperatures the rate of glycoalkaloid accumulation was independent of the level found at harvest and significant interactions were found between cultivar and temperature. The highest rates of accumulation were seen in tubers from the cultivars Brodick and Pentland Crown stored at 4 degrees C. During the first 9 weeks of storage at this temperature the glycoalkaloid content of these two cultivars increased by 7.4 and 19.1 mg per 100 g fresh weight respectively and thereafter remained constant. At 7 degrees C glycoalkaloid content tended to increase more rapidly than at 10 degrees C with again the greatest increases being found for Brodick and Pentland Crown. In the case of the former glycoalkaloid content increased linearly during the 24 weeks of the experiment but the glycoalkaloid content of Pentland Crown tubers stored at 7 degrees C increased rapidly in the first 9 weeks and thereafter increased more slowly, reaching a final value which exceeded the recommended maximum glycoalkaloid concentration for human consumption by 50%. Cultivars which did not accumulate glycoalkaloids rapidly in response to light exposure were the most stable and least sensitive to storage temperature. Tubers transferred to colder conditions nine weeks after storage at 10 degrees C did not accumulate glycoalkaloids at a similar rate to those placed in similar conditions soon after harvest.
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