|Identification of Food Components for INFOODS Data Interchange (UNU, 1989, 165 pages)|
|4. Assigning the correct food component tagnames to the nutrient data|
Vitamin E is most commonly determined by calculation as the sum of the vitamin E activities of the active tocopherols and tocotrienols in a food. This calculated vitamin E value is expressed as alpha-tocopherol equivalents. It is important not to confuse values for alpha-tocopherol equivalents, a measure of total vitamin E, with values for alpha-tocopherol, one of the tocopherol components contributing to the total vitamin E activity.
Historically, vitamin E has also been determined by bioassay. These values are usually expressed in international units (IU). It is possible to convert between alpha-tocopherol equivalents and international units by using the following equation:
1 mg alpha-tocopheroJ equivalents = 1.49 IU
The tagnames for vitamin E, which are based on its method of determination, and for the tocopherol and tocotrienol components of vitamin E are listed below. All are subsidiary to the < comp > structural tag.
|<VITE>||vitamin E; calculated by summation of the |
vitamin E activities of the active tocopherols
and tocotrienols; expressed asalpha-tocopherol equivalents.
|vitamin E; determined by bioassay |
vitamin E; method of determination unknown;
expressed as alpha-tocopherol equivalents
|< TOCPHA > |
< TOCPHB >
< TOCPHD >
< TOCPHG >
< TOCTRD >
< TOCTRG >