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Appl Environ Microbiol. 1973 March; 25(3): 408-413
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Effect of Phosphate and Other Anions on Trimethylarsine Formation by Candida humicola

¹ Laboratory of Soil Microbiology, Department of Agronomy, Cornell University, Ithaca, New York 14850

ABSTRACT

Phosphate inhibited the formation of trimethylarsine from arsenite, arsenate, and monomethylarsonate, but not from dimethylarsinate, by growing cultures of Candida humicola. Phosphite suppressed trimethylarsine production by growing cultures from monomethylarsonate but not from arsenate and dimethylarsinate, and hypophosphite caused a temporary inhibition of both proliferation and the conversion of these three arsenic sources to trimethylarsine. Resting cells of C. humicola derived from cultures grown in arsenic-free media generated the volatile arsenical only after a lag phase. High antimonate concentrations reduced the rate of conversion of arsenate to trimethylarsine by resting cells, but nitrate was without effect.