A photoelectric photometer for the estimation of vitamin A in margarine
- 1 January 1946
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 71 (838) , 20-29
- https://doi.org/10.1039/an9467100020
Abstract
A photoelectric apparatus is described which was designed for routine assays of vit. A by SbCl3. Meticulate directions are given for the prepn. of unsaponifiable samples and for their estimation. One method of calculation requires a sample of the vit. concentrate used in the manufacture of margarine. When this is not available the fading technique is recommended, in which the non-specific absorption is allowed for by the absorption after 30 min. when the SbCl3-vit. A blue has declined by 90%.Keywords
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