In autumn and winter, it's time to eat sweet potatoes again. However, with the extension of storage time, sweet potatoes sometimes have mildew, blackening and long black spots. Can you still eat sweet potatoes with black spots? Some people say that eating black spots is easy to cause cancer, is that true?
Is sweet potato still edible with black spot?
Not always. As for the question of whether sweet potatoes can be eaten with black spots, it is not allowed to generalize. The specific situation should be analyzed specifically:
The common diseases of sweet potato affected by black spot disease are mainly black spot and soft rot. the epidermis of sweet potato affected by black spot disease has brown or black spots, or is shriveled and sunken, and the heart of sweet potato becomes hard and bitter. Sweet potato contains heat-resistant toxins, so eating raw or cooked sweet potato with black spots will cause poisoning. Therefore, once the sweet potato black spot, hard, bitter, mildew, do not eat.
No effect on the black spot of sweet potato caused by oxidation of cracks
If there is black spot in sweet potato, it doesn't matter if it's not attacked by black spot. Just peel off the black spot. For example, when the sweet potato is harvested, because the roots collide with each other, and there is a wound after the collision, the milk contained in it is easy to flow out. Because the milk contains a large number of polyphenol antioxidant substances, combined with oxygen in the air, it will also form a black spot, which has no bad impact on human health, so it's good to cut it off and eat it again.
There was no effect on the black spot of sweet potato after callus treatment
After the harvest of sweet potato, the processors usually place the sweet potato root in the environment of 29-30 ℃ and 90-95% humidity for 4-10 days, so that the wounds on the skin of sweet potato root will form a black cork layer, just like the scab formed by human skin injury, so as to prevent the invasion of pathogenic bacteria. This treatment is called "callus" treatment, which can prolong the storage time of sweet potato. After the treatment of callus, the storage time of sweet potato will also be prolonged The surface of sweet potato forms black spot, which will not harm human body. Just eat, in order to cut off the beauty and then eat.
What happens to the sweet potatoes attacked by black spot
The toxin produced by the black spot pathogen contains the sweet potato ketone and the sweet potato ketone alcohol, which is harmful to the human liver. After people eat, they often have nausea, vomiting, diarrhea and other gastrointestinal symptoms within 24 hours. In serious cases, they also have high fever, headache, asthma, unclear mind, pumping, hematemesis, coma and even death.
The sweet potato attacked by black spot can't be eaten even if it has black spot
Sweet potatoes with black spots can't be eaten even if they are peeled off. The toxin produced by the black spot pathogen in the growth and reproduction of sweet potato can not be removed only by peeling off the epidermis. Especially when the black spot of sweet potato has been distributed more than one third, it can't be eaten any more.