What happened to the blackened yam

May 19, 2023
I did not have the habit of eating yam before, and I do not know how to fry this yam, a few days ago at a friend's house to eat a meal, crystal clear, the taste is also very fresh, so I bought back some to try to do at home, but why I made out of the yam is black it? This yam turned black is what happened?

Oxidation

Yam contains a certain amount of polyphenols, also contains polyphenol oxidase, after cutting contact with oxygen in the air, the enzyme activity is enhanced, will oxidize polyphenols into quinones, showing black, which is the same reason as the apple, eggplant, potatoes, etc. discoloration.

Frying in an iron pan

Families who often eat yam know that yam, like lotus root, is a calcium-starch food, and this food is not suitable for cooking in an iron pot, and the phenolic substances in yam will also react with iron ions to produce a dark blue or black complex, and the phenomenon of yam turning black.

Can you still eat yam when it turns black?

The phenolic substances in yam, whether they are oxidized to produce quinones or react with iron ions to produce complexes, are not toxic, and both substances can be digested and can be eaten without fear of harm to the body.

How to do yam without black

1. yam needs to be soaked in water after peeling, and soaked as soon as possible after slicing, it is best to add a certain amount of vinegar and salt to the water to avoid oxidation and blackening. 2. cooking yam is best to use a casserole, iron pot frying dishes will have some iron ions dissolved in the soup, will react with the phenolic substances in the yam, will turn black, and casserole can completely avoid the appearance of this phenomenon. 3. yam contains phenolic oxidase has a certain activity, so add cut yam with boiling water for blanching treatment, so that the surface layer of the enzyme inactivation, but also to avoid blackening.
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