Vitamin A in mixed feeds, premixes, and foods: development of method
Parrish, D.B.
Journal - Association of Official Analytical Chemists 57(4): 897-902
1974
ISSN/ISBN: 0004-5756 PMID: 4422139 Document Number: 72039
The present official final action method for determining vitamin A in feeds, 39.008–39.013, was simplified where possible and modified to provide alternative procedures so that it could be used to analyze different types of feed and food products. Among the changes were the following: making fewer extractions, solution transfers, and dilutions to volume; using smaller aliquots; and eliminating chromatography. There was less change in the method for samples of low vitamin A content and those containing carotenoid pigments. A biopotency test was added to provide a basis for converting analytical values of vitamin A stated in μg to USP units.