Acorn contains relatively high anti-nutritional substances tannin (4.55%) and toxic hydrocyanic acid (0.98%). Tannin tastes astringent and has poor palatability. Tannin can combine with dietary protein in digestive tract, thus reducing its utilization rate. Tannic acid can also combine with protein in gastrointestinal mucosa to form protein precipitate of tannic acid.

Weaken gastrointestinal peristalsis, cause gastrointestinal weakness, and cause animal constipation. A large amount of tannin can cause hemorrhagic or ulcerative gastroenteritis, abdominal pain and diarrhea. Acorn kernel contains cyanogenic glycoside, which is not toxic in itself. However, after being eaten and chewed by animals, it is hydrolyzed to hydrocyanic acid under the action of enzymes stored in glycosides at a humid and suitable temperature, causing animal poisoning and even death.

Extended data

The main value of oak tree

Wood: The interior is filled with many honeycomb structures, and the interior of the honeycomb is filled with air, so the elasticity of oak is very good. Oak itself is very wear-resistant, and many cylinder pads of engines in various countries are made of oak.

In addition, oak is moisture-proof and moth-proof, which can ensure that wine will not pass away with the years in a dark and humid wine cellar. This pure natural material has no harm to human body, so 100 has been widely used in the production of wine and champagne corks for more than years.

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