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Certain vegetable leaf meals are rich sources of carotene, ranging in potency from 300 to 700 micrograms per gram.Petroleum ether solvents combine good solvent properties for carotene in leaf meals with relatively poor solvent properties for Other plant pigments. A number of procedures for the preparation of carotene concentrates from vegetable leaf meals have been devised. Most of them are hased on the rapid saponification of chlorophyll in petróleum ether solution, followed by adsorption treatment with hydrated lime. Upon removal of the solvent, deep red carotene concentrates equivalent to 20,000-200,000 I.U. vitamin A pier gram are obtained. The yield of purified carotene is from 85 to 95% of the carotene in the original extract.

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A study has been made of the application of the vitamin A-activated glycerol dichlorohydrin reaction to the estimation of vitamin A in fortified poultry mash. Certain constituents present in both unsaponified and saponified petroleum ether feed extracts repress the vitamin A-glycerol dichlorohydrin reaction.Adsorption on a mixture of 3.1 Hyflo Super-cel-activated magnesia No. 2641 removed most