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The standard onion has an eight rating, while "sweet onions" have a two or three rating on the scale. The lower the score or scale the more "sweet" the onions are rated. Anything less than five is considered a sweet onion. The Vidalia onion variety is considered sweet and must have a score of 5.0 μmol/g fw or less.
The release is due to the breaking open of the onion cells and their releasing enzymes called alliinases, which then break down amino acid sulfoxides, generating sulfenic acids. A specific sulfenic acid, 1-propenesulfenic acid, formed when onions are cut, is rapidly rearranged by a second enzyme, called the lachrymatory factor synthase or LFS ...
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The Sunion was originally developed by Bayer.In the late 1980s, scientists started cross-breeding different strains of onions until they were eventually able to obtain bulbs with lachrymatory factor (LF) production levels several times lower than those of a normal onion, thus resulting in tearless, non-pungent bulbs.
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The Onion Futures Act is a United States law banning the trading of futures contracts on onions as well as "motion picture box office receipts". [1] In 1955, two onion traders, Sam Siegel and Vincent Kosuga, cornered the onion futures market on the Chicago Mercantile Exchange. The resulting regulatory actions led to the passing of the act on ...