The bactericidal effect and chemical reactions of acidified nitrite under conditions simulating the stomach

Journal of Applied Microbiology
J XuW Verstraete

Abstract

To examine the hypothesis of non-immune defence mechanisms based on nitrite. The acidified media (nutrient broth or citrate-phosphate buffer) under aerobic conditions with additions of physiological levels of nitrite, L-ascorbic acid, iodide and thiocyanate were used to simulate gastric juice. The bactericidal effects of acidified nitrite on Escherichia coli and lactobacilli were investigated using bacterial plate counts. Conversion of acidified nitrite to nitric oxide, nitrogen dioxide and nitrate was also studied. Nitrite significantly increased the bactericidal effects on E. coli and lactobacilli. The bactericidal effects were enhanced by thiocyanate but not by L-ascorbic acid and iodide. L-Ascorbic acid and thiocyanate, but not iodide, enhanced the decomposition of acidified nitrite in nutrient broth. Acidified nitrite was converted to both nitric oxide and nitrate, but a portion of the acidified nitrite in nutrient broth may have been converted to other unidentified nitrogen compounds. Nitrogen dioxide was not detected in any of the samples. The bactericidal effects of nitrite appeared to be primarily related to nitrous acid, and possibly to other unidentified nitrogenous metabolites, but not to nitric oxide and nitrogen d...Continue Reading

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Citations

Dec 22, 2005·Planta·Gautam SarathRobert B Mitchell
Sep 1, 2009·Otolaryngology--head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery·Paul StoodleyYosef P Krespi
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Jun 4, 2005·Applied and Environmental Microbiology·B M CorcoranR P Ross
Aug 9, 2005·Applied and Environmental Microbiology·Graeme A O'MayGeorge T Macfarlane
Jan 5, 2008·Infection and Immunity·Nicole M IovineYvette Weinrauch
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Nov 20, 2013·Journal of Digestive Diseases·Wen Ming WuLi Hua Peng
Sep 27, 2005·Nitric Oxide : Biology and Chemistry·T SobkoJ O Lundberg
Jan 1, 2004·The Journal of Clinical Investigation·HåKan Björne HJon O Lundberg
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Oct 17, 2008·Journal of Agricultural and Food Chemistry·Umeo TakahamaSachiko Hirota
May 3, 2014·Journal of Agricultural and Food Chemistry·Sonja Veljovic-JovanovicUmeo Takahama

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