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Stress by physical damage is one of the most significant factors which may cause an increase in potato glycoalkaloids. A high percentage of potatoes available on the retail market are physically damaged and possibly are subject to an internal build‐up of glycoalkaloids. To investigate this possibility, analyses for total glycoalkaloids were carried out on damaged potatoes purchased on the retail market. Four separate purchases of three different potato varieties were tested. From this limited sampling it cannot be concluded that no tubers containing a high level of glycoalkaloids due to physical stress reach the retail market. However, in the cross section of damaged potatoes analyzed, in no case was a dangerous level of glycoalkaloids observed.
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Fitzpatrick et al. (1978) studied this question.
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