A Pink Yeast requiring Aneurin

Abstract

AN unidentified strain of ‘pink yeast’ (probably a species of Rhodotorula) isolated from brewer's finings grows well in a defined glucose – salts – ammonia medium in the absence of vitamins of the B complex, with the exception of aneurin. Up to 24 hr., the response to added aneurin is poor, this period presumably being that required for the phosphorylation of aneurin to its pyrophosphate; afterwards the response is marked, whereas controls containing no aneurin grow up poorly, even after 72 hr. of incubation.