TY - JOUR AU - Bermúdez-Vásquez, María José AU - Granados-Chinchilla, Fabio AU - Molina, Andrea PY - 2019/01/01 Y2 - 2024/03/28 TI - Chemical composition and antimicrobial activity of the essential oil of Psidium guajava and Cymbopogon citratus JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 30 IS - 1 SE - Articles DO - 10.15517/am.v30i1.33758 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/33758 SP - 147-163 AB - <p><span class="CharOverride-4"><strong>Introduction.</strong> </span>The resistance of microorganisms to antibiotics is a public health problem that can affect livestock producers by having fewer options to treat animals in the event of a infection. Extracts of some plants with antimicrobial activity may represent an alternative to the use of antibiotics in livestock production. <strong><span class="CharOverride-4">Objective. </span></strong>The objective of this work was to analyze the chemical composition and antimicrobial activity of the essential oils of guava leaves (<span class="CharOverride-5">Psidium guajava</span> L.) and lemon grass (<span class="CharOverride-5">Cymbopogon citratus</span> (DC.) Stapf) grown in Costa Rica and evaluate antimicrobial activity of<span class="CharOverride-5"> P. guajava</span> L. in meat and bone meal. <strong><span class="CharOverride-4">Materials and methods. </span></strong>This research was developed at the Animal Nutrition Research Center (CINA) of the University of Costa Rica between March and October 2016. <span class="CharOverride-5">P. guajava </span>leaves were collected from two different locations (San Pedro and Escazú) and those from<span class="CharOverride-5"> C. citratus</span> from the areas of Sarapiquí and Escazú. The extraction of the oils was done by hydrodistillation. The chemical composition was analyzed by gas chromatography and mass spectrometry. The antimicrobial capacity of the essential oils was evaluated by the disk diffusion test and the 96-well plate microdilution procedure. <strong><span class="CharOverride-4">Results.</span> </strong>The essential oils of <span class="CharOverride-5">C. citratus</span> and <span class="CharOverride-5">P. guajava </span>presented antimicrobial activity against the ten bacterial strains tested, being the gram positive bacteria the most sensitive to them. <span class="CharOverride-5">P. guajava</span> oil from Escazú showed higher antimicrobial activity <span class="CharOverride-5">in vitro </span>with respect to <span class="CharOverride-5">P. guajava</span> oil from San Pedro and <span class="CharOverride-5">C. citratus</span> oil. The oil of <span class="CharOverride-5">P. guajava</span> had the ability to eliminate <span class="CharOverride-5">Escherichia coli</span> that had previously been added to a matrix of meat and bone meal, but not to prevent colonization of it. <span class="CharOverride-4"><strong>Conclusion.</strong> </span>According to the results of this research, the essential oils of lemon grass and guava leaf grown in Costa Rica, have an antimicrobial effect against bacteria relevant for feed safety and feed shelf life, future research is required to evaluate its applicability in animal feed.</p> ER -