Abstract
The vitamin A activity was determined biologically and carotene content colorimetrically on 14 different commercial brands of tomato juice and on the juice prepared from eight different varieties of tomatoes. The vitamin A activity and the carotene content of the commercial brands were well within the range of the values obtained for the different varieties and a probable correlation was found between the vitamin A activity and the carotene content of the different varieties. The mean value for the vitamin A activity of the commercial brands was 11.6 I.U. per cc. (329 I.U. per ounce) showing that tomato juice may contribute significantly to the dietary vitamin A. The amount of lycopene-like compounds in tomato juice is considerably higher than the carotene compounds and was found to vary between different brands and different varieties. A substance was shown to be present in processed tomato juice that had the properties of α-tocopherol in biological assays for vitamin A activity.
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