First Report on Yield and Chemical Composition of Essential Oil Extracted from Myrcia eximia DC (Myrtaceae) from the Brazilian Amazon

Abstract

The essential oil (EO) of plants of the Myrtaceae family has diverse chemical composition and several applications. However, data on the oil yield, its composition, and its complete chemistry are still unavailable for some species belonging to this family, such as Myrcia eximia DC. In this study, the chemical compositions of the EOs of Myrcia eximia were evaluated by using gas chromatography (GC) alone and gas chromatography coupled with mass spectrometry (GC–MS). Samples for both evaluations were collected from the city of Magalhães Barata, State of Pará, Brazil, in 2017 and 2018. For the plant material collected in 2017, EO was obtained by hydrodistillation (HD) only, while, for the material collected in 2018, EO was obtained by hydrodistillation and steam distillation (SD), in order to evaluate the differences in chemical composition and mass yield of the EO. The yields of (E)-caryophyllene were 15.71% and 20.0% for the samples collected by HD in 2017 and 2018, respectively, while the yield was 15.0% for the sample collected by SD in 2018. Hexanal was found to be the major constituent in the EO obtained by HD, with yield of up to 26.09%. The oil yields reached 0.08% by using SD, and 0.01% and 0.36% for the samples collected in 2017 and 2018, respectively, using HD. The results of this study provide new information about the mass yield and chemical composition of Myrcia eximia DC, and they can add value and income to traditional populations, as well as facilitate the preservation of this species.

Chemical Composition, Antimicrobial Properties of Siparuna guianensis Essential Oil and a Molecular Docking and Dynamics Molecular Study of its Major Chemical Constituent

“…The chemical composition of the essential oils was evaluated by gas chromatography/mass spectrometry (GC/MS) according to the methodologies by [ 53 , 54 ], using a Shimadzu QP-2010 plus system under the following conditions: silica capillary column Rtx-5MS (30 m × 0.25 mm, 0.25 μm film thickness); program temperature of 60–240 °C at 3 °C/min; injector temperature of 250 °C; helium as carrier gas (linear velocity of 32 cm/s, measured at 100 °C); splitless injection (1 μL of a 2:1000 hexane solution). Ionization was obtained by electronic impact technique at 70 eV, and the temperature of the ion source and other parts was set at 200 °C.…”

Extraction Yield, Chemical Composition, Preliminary Toxicity of Bignonia nocturna (Bignoniaceae) Essential Oil and in Silico Evaluation of the Interaction

“…For the HD extraction process, dry and fresh sample (40 g each) were used. The same proportion of water in relation to plant material was used, according to the literature [44,45] …”

“…Analyses of the chemical profiles of the aroma and essential oil fractions of from Bignonia nocturna were performed using protocols reported earlier by our research group [45] . The retention index (RI) was calculated in accordance with a different study [47] .…”

Etnobotânica de plantas medicinais aromáticas: preparações e usos da flora local em cinco comunidades rurais localizadas na região do Baixo Tocantins, Pará, Brasil

“…Na Amazônia brasileira muitas espécies de PMA já foram estudadas, como Ontrichardia linifera Schott (Araceae), (Batista et al, 2019;Oliveira et al, 2019a;Silva et al, 2019a;Vilhena et al, 2019;Ferreira et al, 2020). Nas comunidades amazônicas, principalmente aquelas que se encontram localizadas distantes dos grandes centros médicos e de diagnósticos, esses vegetais constituem a fonte primária de recursos para cuidar da saúde ou curar de diversas afecções (Santos et al, 2019).…”

“…A utilização em larga escala das PMA pode ser devido as múltiplas propriedades terapêuticas atribuídas, principalmente, aos óleos essenciais. Os quais são uma mistura de produtos químicos hidrofóbicos extraídos das plantas, altamente concentrados e voláteis (Silva et al, 2019a;Vilhena et al, 2019;Ferreira et al, 2020). Nesse contexto, esse estudo objetivou fazer o levantamento da flora medicinal e aromática utilizadas pelos moradores de cinco comunidades rurais, bem como, as indicações, as partes das plantas mais utilizadas, os modos de preparo dos remédios caseiros e verificar os valores de concordância de uso principal das espécies.…”