Abstract
Jennings and Williams1 directed attention to the fact that kojic acid is a common product of fungus metabolism and may account for the antibacterial properties of a number of fungi not yet investigated. They further pointed out that the ferric chloride colour test for this substance is not specific. However, since kojic acid must be present in fairly high concentration if it is responsible for an inhibitory effect with, for example, the cylinder-plate test, it can usually be obtained in crude crystalline form by allowing an ether extract of crude culture fluid, made at about pH 5, to evaporate.
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