Vitamin A in Mixed Feeds

M. L. Cooley; J. B. Christiansen; R. C. Koehn

doi:10.1021/ac60029a019

Vitamin A in Mixed Feeds

Analytical Chemistry ◽

10.1021/ac60029a019 ◽

1949 ◽

Vol 21 (5) ◽

pp. 593-595 ◽

Cited By ~ 2

Author(s):

M. L. Cooley ◽

J. B. Christiansen ◽

R. C. Koehn

Keyword(s):

Vitamin A ◽

Mixed Feeds

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The Use of Large Samples in the Determination of Vitamin A in Mixed Feeds Fortified with Dry Vitamin A Supplements

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/43.1.25 ◽

1960 ◽

Vol 43 (1) ◽

pp. 25-28

Author(s):

F Howard Tinkler ◽

Joseph B Hanley ◽

Robert W Lehman

Keyword(s):

Vitamin A ◽

Large Samples ◽

Mixed Feeds

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Vitamin A in Mixed Feeds, Premixes, and Foods: Collaborative Study

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/57.4.903 ◽

1974 ◽

Vol 57 (4) ◽

pp. 903-909

Author(s):

Donald B Parrish

Keyword(s):

Standard Deviation ◽

Vitamin A ◽

Collaborative Study ◽

Carotenoid Pigments ◽

Feed Supplement ◽

Mixed Feed ◽

Breakfast Cereal ◽

Liquid Feed ◽

Transfer Procedures ◽

Mixed Feeds

Abstract The official final action method for determining vitamin A in mixed feeds, 39.008–39.013, was simplified where possible, principally in extraction and transfer procedures and by omission of chromatography, and was modified to apply to a larger variety of feed and food products. Twenty-two analysts of various degrees of experience participated in the collaborative study of the method, using 6 products. After outliers were eliminated by the Dixon test, data were analyzed and averages were compared with amounts of vitamin A known to be, or estimated, in each sample. The average, per cent deviation from added amount, standard deviation, and coefficient of variation, respectively, on each sample were: breakfast cereal (Sample 1), 23.8 μg/g, 2% less, 3.08, 13% ; mixed feed (or premix), 12.6 μg/g, 5% less, 0.99, 8%; mixed feed containing carotenoid pigments (Sample 3 ), 4.5 μg/g, 3% more, 0.66, 15%; mixed feed without pigments, 4.5 μg/g, 3% more, 0.57, 13% ; liquid feed supplement, 11.4 μg/g, 9% less, 1.44, 12%; powdered breakfast drink, 19.6, 7% less, 1.91, 10%. Some analysts did not correct for pigments in Samples 1 and 3, or for losses on analysis, which could account in part for the degree of variation and for the lower values on some samples. The method has been adopted as official first action to replace 39.008-39.013.

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