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The impact of antimicrobial food additives and sweeteners on the growth and metabolite production of gut bacteria

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Abstract

Metabolic disorders caused by the imbalance of gut microbiota have been associated with the consumption of processed foods. Thus, this study aimed to evaluate the effects of antimicrobial food additives (benzoate, sorbate, nitrite, and bisulfite) and sweeteners (saccharin, stevia, sucralose, aspartame, and cyclamate) on the growth and metabolism of some gut and potentially probiotic bacterial species. The effects on the growth of Bifidobacterium longum, Enterococcus faecium, Lactobacillus acidophilus, and Lactococcus lactis subsp. lactis cultures were investigated using a turbidimetric test and by determining the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). To evaluate the metabolic activity, the cultures were exposed to compounds with the highest antimicrobial activity, subjected to cultivation with inulin (1.5%), and analyzed by liquid chromatography for the production of short-chain fatty acids (acetate, propionate, and butyrate). The results showed that potassium sorbate (25 mg/mL), sodium bisulfite (0.7 mg/mL), sodium benzoate, and saccharin (5 mg/mL) presented greater antimicrobial activity against the studied species. L. lactis and L. acidophilus bacteria had reduced short-chain fatty acid production after exposure to saccharin and sorbate, and B. longum after exposure to sorbate, in comparison to controls (acetic acid reduction 1387 μg/mL and propionic 23 μg/mL p < 0.05).

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The data generated in this study are in the published article and available from the corresponding author upon reasonable request.

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Acknowledgements

The authors are thankful for the financial support provided by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, DF, Brazil—financial code 001) and the Coleção de Culturas Tropical for the donation of the bacteria B. longum.

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A.S.L. designed study, performed research, analyzed data, contributed new methods, and wrote the paper. A.E.C.A. contributed new methods, designed study, and wrote the paper. K.I.A.M. analyzed data. A.S. analyzed data and contributed new methods. M.C.T.D. performed research and designed study.

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Correspondence to Aline de Souza Lopes.

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The authors declare no competing interests.

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de Souza Lopes, A., Elisabete Costa Antunes, A., Idelça Aires Machado, K. et al. The impact of antimicrobial food additives and sweeteners on the growth and metabolite production of gut bacteria. Folia Microbiol 68, 813–821 (2023). https://doi.org/10.1007/s12223-023-01076-6

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  • DOI: https://doi.org/10.1007/s12223-023-01076-6

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