Which chemical present in onion?

Onions contain various sulphur compounds, including alk(en)yl cysteine sulfoxides and thiosulphinates, which are responsible for the characteristic pungent flavour and aroma of the vegetable. These compounds are released when onions are cut or crushed, and they can irritate the eyes, nose, and throat, causing tears and a burning sensation.

2. Quercetin:

Quercetin is a flavonoid antioxidant that is found in high concentrations in onions. It has antioxidant and anti-inflammatory properties and has been linked to several health benefits, including reduced risk of cardiovascular disease, certain types of cancer, and improved brain function.

3. Anthocyanins:

Red onions contain anthocyanins, which are a type of flavonoid that gives them their characteristic red colour. Anthocyanins have antioxidant properties and have been linked to various health benefits, including improved heart health, reduced inflammation, and better brain function.

4. Fructans:

Onions are a good source of fructans, a type of soluble dietary fiber. Fructans can help promote digestive health by supporting the growth of beneficial gut bacteria and reducing the risk of constipation.

5. Vitamin C:

Onions are a good source of vitamin C, an essential nutrient that plays a vital role in immune system function, collagen production, and wound healing.

6. Potassium:

Onions are a good source of potassium, a mineral that is important for regulating blood pressure, fluid balance, and nerve function.

In addition to these, onions also contain other nutrients, such as calcium, magnesium, phosphorus, and iron.