Word: provitamin
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Dates: during 1930-1939
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...could be kept in storage without losing its power. Vitamin C is mainly to be found in fruit, vegetables or fresh milk from cows that have been grazing in the open. In my experiments I used the juice of oranges. ... In the unripe oranges I found the so-called provitamin -that is, the product which, when the fruit ripens, develops into the vitamin. I found that it was identical with what the chemists call narkotin. . . . Having arrived at this conclusion, my next task was to find a mechanical process to deal with narkotin, which proved to be very difficult...
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