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O óleo essencial de Cymbopogon citratus cultivado em canteiro único e consorciado com Achillea millefolium, foi obtido por arraste a vapor e o rendimento de óleo em observação sazonal, tendo como parâmetros a temperatura, índices pluviométricos e período de coleta. Os melhores rendimentos foram observados para período matutino em dias com altas temperaturas e altos índices pluviométricos. A análise microbiana do óleo essencial de C. citratus foi determinada pela técnica de microdiluição em caldo (MIC) contra as leveduras Candida albicans e C. tropicali, e para as bactérias Escherichia coli, Sthaphylococcus aureus e Pseudomonas aeruginosa. Os óleos essenciais obtidos do canteiro único e consorciado apresentaram atividade moderada frente às leveduras testadas (0,63 - 1,25 mg/mL). Para as bactérias, o óleo essencial da planta cultivada em canteiro único apresentou alta atividade frente ao Sthaphylococcus aureus (0,08 mg/mL), e foi inativo para as demais bactérias. The essential oil of the plant Cymbopogon citratus, cultivated separately, and also joined with Achillea millefolium L, was obtained by the process of steam distillation. The oil yield was determined through seasonal variation, having as main parameters the temperature, the pluviometer indexes and the collection time. The best results were obtained in the morning period, during high-temperature-days presenting high pluviometer indexes. The microbiological analysis of Cymbopogon citratus essential oil against leavenings (Candida albicans and C. tropicalis), and against bacteria (Escherichia coli, Sthaphylococcus aureus and Pseudomonas aeruginosa) was determined by micro-dilution in broth (MIC). The essential oils cultivated separately, and joined with Achillea millefolium L., presented moderate activity in relation to the tested yeasts (0.63 - 1.25 mg/mL-1). Regarding bacteria, the essential oil of the plant cultivated separately presented high activity in relation to Sthaphylococcus aureus (0.08 mg/mL). On the other hand, the oil revealed to be inactive against other bacteria

Determinação do rendimento e atividade antimicrobiana do óleo essencial de Cymbopogon citratus (DC.) Stapf em função de sazonalidade e consorciamento