Acetate, propionate, butyrate, glucose, and sucrose as carbon sources for denitrifying bacteria in soil

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Abstract
Acetate, propionate, and butyrate were compared with glucose and sucrose as carbon substrates for denitrifying bacterial activity in an agricultural soil. After 216 h of incubation in the laboratory, the denitrification capacity per mole of carbon differed in the order sucrose < glucose < acetate < propionate < butyrate. In the acetate-, propionate-, and butyrate-amended soil, the denitrification activity was positively related to the amount of electrons available per mole of carbon. The low denitrification activity in soil amended with glucose was probably caused by competition for carbon between denitrifying and fermentative bacterial populations. Significant production of acetate occurred in soil amended with both glucose and nitrate, suggesting that denitrification and fermentation could occur simultaneously under anaerobic conditions.Key words: Short-chain fatty acids, denitrification, carbon sources, metabolic pathways, fermentation.

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