How to prevent black yam
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. So can black yam still eat? Let's take a look at the specifics below!
Can yam become black to eat?
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 browning of the enzymes in the peeled yam causes the color to darken. 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 do black yam
Add a small amount of salt to the peeled and washed yam so that the yam will not yellow.
Vinegar itself is a catalyst, its acidity will change the iron quality, so that the yam will not turn black. In addition, the vinegar will also have condensation, which can keep the yam appearance black, the color is very beautiful, and the sweetness will not be lost. Of course, anti-oxidation salted bar is also available, but the effect is not as good and affordable as vinegar.
You can also fry yam first with water.
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.
How to prevent black yam
1, immediately after each rapid peeling, immediately wash the surface with water, and then cut the moon cake into a hob with a plastic knife, and then soak the water, before entering the pot to soak the yam water all do not want, so little Did not turn black.
2, soaked yam soaked in cold water added vinegar or soaked in lemonade, and then remove fish and other cooking water, so that if not eaten immediately, the yam will not turn black.
3, you can first put the yam into the boiling water to cook, not too much fire, when the cut thicker, in the fishing up, so that the yam enzyme elements destroyed, it will not turn black.
4, if the yam with a kitchen knife to cut directly, the contact surface will turn black, and use a plastic spoon in the yam skin draw a circle, you can easily break with your hands, how much to eat cut, you can prevent the yam cut surface contact with the knife surface and black.
5. After the yam is cut open, the oxygen will turn yellow. When cooking, the iron pan will turn black. In order to prevent discoloration of yams, you can put the yam into the steamer and steam for one minute. You can also use the microwave oven for one minute to disable the polyphenol oxidase.
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