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Chemical characterization and insecticidal potential of the essential oil of Ocimum gratissimum L. (Lamiaceae) against Nauphoeta cinerea (Blaberidae)

2020; Grupo de Pesquisa Metodologias em Ensino e Aprendizagem em Ciências; Volume: 9; Issue: 9 Linguagem: Inglês

10.33448/rsd-v9i9.6412

2525-3409

Felicidade Caroline Rodrigues, José Weverton Almeida‐Bezerra, Kleber Ribeiro Fidelis, Adrielle Rodrigues Costa, Mikael Amaro de Souza, Maria Haiele Nogueira da Costa, Luciano Temoteo dos Santos, Maria Aparecida Barbosa Ferreira Gonçalo, Saulo Almeida de Menezes, Samara Mendes de Sousa, Edna Karol Rodrigues De Araujo, Ana Vaeline Patricio Braga, Talina Guedes Ribeiro, Angélica Rodrigues de Souza Costa, Marcos Aurélio Figueirêdo dos Santos, Ricardo Gomes dos Santos Nunes, Maria Ivaneide Rocha,

Essential Oils and Antimicrobial Activity

Plants are considered a rich source of bioactive compounds and an alternative agent for insect control. Among them, representatives of the Lamiaceae family are the best known for this potential, as they produce volatile compounds with insecticidal activities, known as essential oils, as is the case with Ocimum gratissimum. In this way, the present work had as objective, to determine the chemical composition of the oil of the leaves of O. gratissimum and its potential insecticide against the cockroach Nauphoeta cinerea. For that, the essential oil was chemically characterized by means of a Gas Chromatograph coupled to a Mass Spectrometer (GC/MS). As for the insecticidal action, nymphs (20 days of age) were used and the fumigation methodology was used in concentrations ranging from 50 to 1000 μg of oil per mL of air. Mortality rates were observed every 12 hours for 1 day. The results showed that the essential oil has insecticidal properties, since it had a median lethal concentration (LC50) of 516 µg/mL. Such property may be related to the heterogeneous composition of the oil, which had 12 terpenic compounds, with 1.8 Cineole being the major compound (30.04%). Thus, the essential oil of O. gratissimum has an insecticidal activity and can be used to fight pests, as in the case of cockroaches.