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In the early 20th century the discovery of began. Today there is a chance that there are some that are still undiscovered. The definition of vitamin is: one of several substances necessary for animal nutrition, and occurring in minute quant ....

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... thee chemist Casimir Funk identified that the antiberiberi substance in unpolished rice was an amine (a type of Nitrogen-containing compound), so Funk proposed that it be named vitamine, from vital amine. It was later discovered that different vitamins have different chemical properties. This discovery caused vitamine to be turned into vitamin. In 1912 Hopkins and Funk made a hypothesis. The hypothesis stated the absence of some vitamins could cause diseases such as beriberi and scurvy. Later a letter was assigned to each vitamin. The letters which were assigned to vitamins in the early years of vitamin research categorize the ...