How to do after peeling yam black

May 21, 2023
People who like to eat yam know that yam will soon turn black after peeling, and potatoes, eggplant, apples, etc. are caused by the oxidation of oxygen in the air, so how can this yam turn black after peeling?

Why does the yam turn black after peeling

The yam contains a certain amount of phenolic substances, also contains phenolic oxidase, after peeling contact with oxygen in the air, the enzyme is activated, so that the phenolic substances are oxidized to quinones, showing black, brown or purple.

How to do after yam peeling black

The yam will be oxidized to black after peeling, and this change is irreversible, therefore, once blackened, only the surface discolored part can be removed again, and the inner layer of the yam flesh remains white.

Can you still eat yam when it turns black?

This change has very little effect on the yam itself, and the quinones produced are not toxic and will not be absorbed in the stomach and intestines, so it can be eaten without worry, but the fried yam is not very beautiful.

How to prevent the yam from turning black after peeling

Soaking

The enzymes and phenols in the yam will only be oxidized when they come into contact with oxygen, so soak the peeled yam in water, salt water, vinegar water, and wine as soon as possible to avoid being oxidized.

Heat treatment

Yam blackening requires a certain amount of enzymes to participate, so put the unpeeled yam into a steamer for a while to make the enzymes on the surface of the yam inactivate, so that after handling too many yams peeled can be directly exposed to air and will not turn black.
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