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Red onions tend to be medium to large in size and have a sweeter flavor than white or yellow onions due to low levels of pyruvic acid and sulfur compounds. They are often consumed raw (and can be added to salads for color and bite), grilled, or lightly cooked with other foods. [ 2 ]
The onion plant (Allium cepa), also known as the bulb onion [ 6 ] or common onion, [ 3 ]: 9–10 is the most widely cultivated species of the genus Allium.[ 7 ][ 8 ] It was first officially described by Carl Linnaeus in his 1753 work Species Plantarum. [ 9 ] A number of synonyms have appeared in its taxonomic history:
Onions contain sulfur compounds that are released when the skin is broken. When this gas mixes with the liquid in your tear ducts, it causes your eyes to water. Fresh onions have more sulfur ...
Yellow onion. The yellow onion or brown onion (Allium cepa L. [1][2]) is a variety of dry onion with a strong flavour. They have a greenish-white, [3] light yellow, [4] or white inside; [5] its layers of papery skin have a yellow-brown or pale golden colour. [3][4] It is higher in sulphur content than the white onion, which gives it a stronger ...
Allicin is unstable and quickly changes into a series of other sulfur-containing compounds such as diallyl disulfide. [3] Allicin is an antifeedant, i.e. the defense mechanism against attacks by pests on the garlic plant. [4] Allicin is an oily, slightly yellow liquid that gives garlic its distinctive odor. It is a thioester of sulfenic acid.
AMS is a volatile liquid which is absorbed into the blood during the metabolism of garlic-derived sulfur compounds; from the blood it travels to the lungs [2] (and from there to the mouth, causing garlic breath) and skin, where it is exuded through skin pores. Washing the skin with soap is only a partial and imperfect solution to the smell.
The content of these sulfur-containing secondary compounds strongly depends on stage of development of the plant, temperature, water availability and the level of nitrogen and sulfur nutrition. In onion bulbs their content may account for up to 80% of the organic sulfur fraction. Less is known about the content of secondary sulfur compounds in ...
Allyl propyl disulfide is an organosulfur compound with the chemical formula C 3 H 5 S 2 C 3 H 7. It is a volatile pale-yellow liquid with a strong odor. It is a major component of onion oil and is used in food additives and flavors. [2] Allyl propyl disulfide is present in garlic and onion. When onion or garlic is sliced, the substance ...