Determination of Vitamin A Ester in Fortified Poultry Mashes

Wall, Monroe E.; Kelley, Edward G.

doi:10.1021/ac60020a024

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…This reagent has been found to give results with fish liver oils in substantial agreement with the antimony trichloride method (343). It has been reported that poultry mashes contain substances which suppress the reaction but which can be removed by adsorption on a mixture of Hyflo Super-Cel and activated magnesia (368). Because this procedure also removed vitamin A alcohol, it is applicable when the poultry mashes contain vitamin A only in the form of ester.…”

Section: Vitaminsmentioning

confidence: 71%

Food

Oser¹

1949

Anal. Chem.

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THE ultimate objectives of the food analyst and the variety of techniques employed to achieve them make this branch of chemistry particularly fascinating. The analytical methods of the food chemist may be applied in the development and enforcement of standards of identity, purity, or value; in problems of decomposition or spoilage under either normal or abnormal storage conditions; in studies designed to improve or control the quality of natural or processed foods; or in the determination of the nutritive value of foods for scientific, dietary, or labeling purposes. Interest in many of these objectives stems directly or indirectly from our federal and state food laws which are probably '

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Section: Vitaminsmentioning

confidence: 71%

Food

Oser¹

1949

Anal. Chem.

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“…pressure; this reagent was recommended for analytical purposes (13)(14)(15). Such material has been used for the determination of vitamin A in dairycalf blood plasma (1, 8, 30), cow blood plasma (17,18), rat blood serum (12), rat liver and kidney (7), human blood serum (13), fish liver oils (2, 3, 14), cows' milk (18), human milk (11), and fortified poultry mashes (19).…”

mentioning

confidence: 99%

“…No other indications regarding the effect of impurities in the reagents seem to have been reported. However, the presence in some biological materials of substances which suppress the GDH-vitamin A color reaction has been recognized (1,19), although the chemical nature of these color inhibitors has not been elucidated.…”

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confidence: 99%

Reactions of Activated Glycerol Dichlorohydrin with Vitamin A

Allen¹,

Fox²

1950

Anal. Chem.

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The activation of glycerol dichlorohydrin (GDH) by the addition of small quantities of concentrated hydrochloric acid, concentrated sulfuric acid, or chlorosulfonic acid has been investigated. The absorption spectra of the products of the reaction of vitamin A acetate with these acid-activated reagents are presented. Activation by vacuum distillation of GDH with antimony trichloride produces a more stable reagent, and the color after reaction with vitamin A is more stable than that produced by any of the acid-activated reagents. Compounds that react readily with hydrogen chloride appear to prevent the normal GDH-vitamin A color reaction.

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“…Applicability of the l,3-dichloro-2-propanol [activated a,yglycerol dichlorohydrin, (GDH)] reaction (11- 15,17) in place of the Carr-Price reaction (2) which is used exclusively in hitherto available methods for milk.…”

mentioning

confidence: 99%