Abstract
A commercial preparation of vitamin free acid-hydrolyzed casein (casamino acids) contains a growth factor that substitutes for nicotinic acid in nicotinamide adenine dinucleotide auxotrophs of Escherichia coli. This replacing factor was purified by a combination of ethanol extraction, descending partition chromatography, gel permeation chromatography, and crystallization. Structural analysis by mass spectrometry and infrared spectroscopy indicated that the compound has a mass of 368 daltons and contains six types of radicals. A possible structure is presented.
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