Abstract
Essential oils (EOs) extracted from Citrus peels contain 85%–99% volatile components (a mixture of monoterpenes, sesquiterpenes, and their oxygenated derivatives) and 1%–15% non-volatile compounds. Citrus EOs have been long known for their antimicrobial properties, owing to which these EOs have a diverse range of applications. However, no studies have reported the applicability of Citrus EOs for the control of bacterial and yeast contaminants in the bioethanol industry. In this regard, the present review aimed to explore the feasibility of Citrus EOs in this industry. The Web of Science database was searched for reports that described the association of Citrus EOs with the most common microorganisms in the bioethanol industry to evaluate the efficacy of these EOs as antimicrobial agents in this context. The objective of the review was to suggest a novel antimicrobial that could replace sulfuric acid and antibiotics as the commonly used antimicrobial agents in the bioethanol industry. Citrus EOs exhibit antibacterial activity against Lactobacillus, which is the main bacterial genus that contaminates this fermentation process. The present report also confirms the selective action of these EOs on the contaminating yeasts and not/less on ethanol-producing yeast Saccharomyces cerevisiae, however further studies should be conducted to investigate the effects of Citrus EOs in yeast-bacterium co-culture.
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This work was supported by Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP process 2018/19139–2, research grant), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq process 309688/2018–3, fellowship to SRCA) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES—Finance Code 001, fellowships to AV and LDS).
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SRCA conceived, designed, wrote, and revised the manuscript. AA, FAA, LDS, BNS, and CSB wrote the manuscript. All authors read and approved the final manuscript.
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Ceccato-Antonini, S.R., Shirahigue, L.D., Varano, A. et al. Citrus essential oil: would it be feasible as antimicrobial in the bioethanol industry?. Biotechnol Lett 45, 1–12 (2023). https://doi.org/10.1007/s10529-022-03320-4
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DOI: https://doi.org/10.1007/s10529-022-03320-4