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The enzyme unit, or international unit for enzyme (symbol U, sometimes also IU) is a unit of enzyme's catalytic activity. [ 1 ] 1 U (μmol/min) is defined as the amount of the enzyme that catalyzes the conversion of one micro mole of substrate per minute under the specified conditions of the assay method .
In pharmacology, the international unit (IU) is a unit of measurement for the effect or biological activity of a substance, for the purpose of easier comparison across similar forms of substances. International units are used to quantify vitamins and biologics ( hormones , some medications , vaccines , blood products and similar biologically ...
This is the activity of an enzyme per milligram of total protein (expressed in μmol min −1 mg −1). Specific activity gives a measurement of enzyme purity in the mixture. It is the micro moles of product formed by an enzyme in a given amount of time (minutes) under given conditions per milligram of total proteins. Specific activity is equal ...
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
A template (that is US-centric) for recording the nutritional value of foods. SI units must be inserted manually with a {{nbsp}} between the unit and the value. (g = grams, μg = micrograms, IU = international units). Percentage daily value (%DV) are roughly. estimated using US recommendations for adults from the USDA. Template parameters [Edit template data] This template prefers block ...
International units (IU) are based on measured biological activity or effect, or for some substances, a specified equivalent mass. [ citation needed ] Enzyme activity ( kat ) is commonly used for e.g. liver function tests like AST , ALT , LD and γ-GT in Sweden.
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One IU of tocopherol is defined as 2 ⁄ 3 milligram of RRR-α-tocopherol (formerly named d-α-tocopherol). 1 IU is also defined as 0.9 mg of an equal mix of the eight stereoisomers, which is a racemic mixture, all-rac-α-tocopheryl acetate. This mix of stereoisomers is often called dl-α-tocopheryl acetate. [12]