Can yam become black after eating?
Yams discolored due to mildew cannot be eaten, but yam that is discolored by oxidation can be eaten. Fresh yam is easy to oxidize with the oxygen in the air. It is also prone to browning when it comes into contact with metals such as iron knives. It looks like the white yam has turned black. Therefore, there is no problem with yam becoming black and you can eat it on your own.
The darkened yam is due to the browning of the enzyme and the darkening of the color. There are three main conditions for browning: polyphenols, polyphenol oxidase and oxygen. The yam is peeled and exposed to the air. The polyphenols react with oxygen to produce o-quinone, which is further oxidized to form brown pigment and melanin.
This situation is not uncommon in real life. After the peeling of apples, eggplants, lotus roots, etc., enzyme browning causes darkening, and the peeled yam is immersed in cold water to make it isolated from oxygen in the air. It will not change color. If you eat it, there is no problem, but after cooking it does not look good.
How to peel yam is not black?
The phenolic substances in the yam are exposed to the oxygen in the air and oxidized to produce colored anthraquinones that are not in direct contact with the air, such as being soaked in water. Salt water can be used. You can also put some white vinegar in a bowl of clear water, and the sliced ​​yams will not turn black in vinegar.
If you do not want yams to be oxidized, it is recommended that they be peeled and then soaked in water. If soaked in hot water, it will not only prevent oxidation blackening, but also neutralize itchy alkaloids in yam to reduce the use of hand. Allergic reaction when caught.
When cooking yams, you should also pay attention to some techniques, because the new yam is easy to oxidize with the oxygen in the air, and after contact with iron and other metals, there will be discoloration. Therefore, it is better to cut the yam through some treatments. You can use a bamboo knife or a plastic blade to draw a line on the skin first, and then peel it off into pieces. You can also use a rice wine to soak the yam first and then blow it with a hair dryer. In order to promote healing of the incision, use napkins to wrap it, pack several layers of newspapers on the outside, and put it at the corner of a cool wall for use.
The yam peeled and sloppy: wearing gloves to cut in water
Yam is delicious and nourishing, but there is a drawback, the hand is easy to allergic to mucus. This is because the yam secreted mucus contains alkaloids and saponin, which is very irritant, and it can be very itchy when it comes into contact with the skin. Washing with water does not help. When you go to the yam skin, you will have a hard time experiencing it if you touch your hand. How to peel the most convenient?
Experts recommend wearing plastic or disposable gloves and cutting yam skin in water. This will not only prevent mucus from sticking to your hands, but it will also prevent yam from slipping in your hands.
What if the mucus sticks to your hand? Can be washed with water and a little vinegar. Yam skin easily leads to skin allergies. Just cut the yam's hand and do not touch it, wash it several times more quickly, otherwise it will scratch where it is. Applying edible oil to your hands can be alleviated. After yam slices, they should be soaked in salt water immediately to prevent oxidation blackening.
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