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Why do sweet onions cause less tears than non-sweet onions ?

放大字体  缩小字体 发布日期:2007-08-06
核心提示:Typical yellow, white and red onions have an average sugar content of about 3%. For an onion to be considered sweet it should have a sugar content of at least 6%, but some have as high as 15%. Sweet onions also have a lower concentration of pyruvic

Typical yellow, white and red onions have an average sugar content of about 3%. For an onion to be considered "sweet" it should have a sugar content of at least 6%, but some have as high as 15%.

Sweet onions also have a lower concentration of pyruvic acid, which is part of the chemical reaction in onions that accounts for their pungency and the tearing effect produced when cut (see here) . An ordinary onion has a pyruvic-acid content of 10% to 13%, whereas a sweet onion typically has levels below 5%.

Therefore the sweetness as such does not influence the tearing effect.

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