1887

Abstract

SUMMARY: Rubratoxin A or B can be assayed by overnight incubation at 25 °C of a standard inoculum of (Ehrenburg) strain w in nutrient medium containing differing toxin concentrations. Growth is estimated by measuring the extinction of the organism suspension after inactivation with Hayem’s fluid. The values obtained are expressed as a percentage of a normal control. Dose/res-ponse curves of percentage inactivation against log concentration of rubratoxin had linear ranges of 2·6 to 23 g/ml for rubratoxin A and 8·5 to 30 g/ml for rubratoxin B. The concentrations of toxin required to produce 50 inhibition of growth in standard suspensions of strain w were 8·75 g/ml and 20·5 g/ml respectively.

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/content/journal/micro/10.1099/00221287-80-1-85
1974-01-01
2022-01-24
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