Pyruvate scale

Pyruvate scale

The Pyruvate scale measures pungency in onions and garlic with units of um/gfw. It is named after the acid in onions which makes peoples eyes tear up when cutting them.

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 are considered sweet and must have a score of 5.0 um/gfw or less.Fact|date=February 2007 The Supasweet onion (usually grown in Lincolnshire, England) registers 1.5 to 2 on the scale. A standard brown onion is usually in the range of 6-7 out of 10.

Soil type, rain, and sunlight affect the pungency in onions and garlic and, therefore, their score on the pyruvate scale.

External links

* [http://www.ams.usda.gov/nop/indexNet.htm The National Organic Program] — by the USDA


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