Author(s):

ThupstanTsewang, Vivek Verma, Somen Acharya and Sunita Kapila

Abstract: Onion, which has protective effects on human health, is one of the most common vegetables used in everyday diets. The market for onions from customers is due to the presence of different bioactive compounds and secondary metabolites. These are the additional nutritional constituents of plants present in very small quantity. The daily consumption of onion reduces blood pressure by antiaggregating the thrombyocytes, stimulates haematopoiesis, reduce asthma attack,anticholesterolemic, antidiabetic and effective against cardiovascular disease. Interest in the health benefits of phytochemical constituents is growing and has culminated in a thorough analysis of flavonols, a category of secondary metabolites commonly documented to have health benefits, primarily via their antioxidant and anti-inflammatory effects, which are non-nutritive plant polyphenols. It is found most of the plant, studied extensively in fruits and vegetables. Quercetin, glycosides, allicin (S-containing compound), vitamins and minerals are all bioactive substances rich in onions. Onion as vegetable has high medicinal values, widely used in cosmetics industries and as preservatives. Onion bioactive compounds and their health benefits have yet to be thoroughly investigated.

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