The potatoes contain Solanine (Glycoalkaloids), the poisoning component solanine is also known as potato toxin. Glycoalkaloids found in potatoes are in the peel, sprouts, and especially in the tops and stems.If potatoes are still hard to touch and they don't look too wrinkly and shriveled. Remove the sprouted parts, and you can eat them. But avoid very shriveled or wrinkled potatoes as they can make you sick. While Rotten potatoes should be wasted without any further delay. Because they are very dangerous Here is How toxic gas from rotten potatoes killed a whole family.