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102
FOOD CHEMICALS CODEX
TOCOPHEROLS
Weight-Unit Relation
relationships
In accordance with the convention adopted by the National Formulary,
label claims for Tocopherol products described in this Codex when ex-
pressed in International Units (I. U. ) of Vitamin E are based on the follow-
ing equivalents:
1 mg. dl-Alpha Tocopheryl Acetate
= 1 International Unit
1 mg. d1-Alpha Tocopherol
= 1.1 International Unit
1 mg. d-Alpha Tocopheryl Acetate
= 1.36 International Unit
1 mg. d-Alpha Tocopherol
= 1.49 International Unit
1 mg. d-Alpha Tocopheryl Acid Succinate = 1.21 International Unit
VOLUMETRIC APPARATUS
Most of the volumetric apparatus available in the United States is
calibrated at 20, although the temperatures generally prevailing in
laboratories more nearly approach 250, which is the temperature speci-
fied generally for tests and assays.
This discrepancy is inconsequen
tial provided the room temperature is reasonably constant and the appa-
ratus has been calibrated accurately prior to and under the conditions
of its intended use.
Use. To attain the degree of precision required in many assays in-
volving volumetric measurements and directing that a quantity be "accu-
rately measured, " the apparatus must be chosen and used with exceptional
care.
Where less than 10 ml. of titrant is to be measured, a 10-ml.
buret or microburet generally is required.
accuracy .
The design of volumetric apparatus is an important factor in assuring
For example, the length of the graduated portions of gradu-
ated cylinders should be not less than five times the inside diameter,
and the tips of burets should permit an outflow rate of not more than
0.5 m1. per second.

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