Eugenia neonitida Sobral and Eugenia rotundifolia Casar. (Myrtaceae) essential oils: composition, seasonality influence, antioxidant activity and leaf histochemistry

Abstract

Investigou-se a influência da sazonalidade na composição do óleo essencial de folhas frescas de Eugenia neonitida Sobral e Eugenia rotundifolia Casar. (Myrtaceae) coletadas trimestralmente, assim como a atividade antioxidante do óleo essencial de folhas secas e a histoquímica foliar. Os componentes majoritários do óleo essencial de E. neonitida foram biciclogermacreno, germacreno D e b-cariofileno e os de E. rotundifolia foram a-pineno, b-pineno e b-cariofileno. Os óleos essenciais de ambas as espécies apresentaram principalmente hidrocarbonetos e álcoois cíclicos, sendo o óleo essencial de E. neonitida composto principalmente por sesquiterpenos e o de E. rotundifolia por monoterpenos. A precipitação parece influenciar na composição dos óleos essenciais de ambas as espécies. O óleo essencial de folhas secas apresentou baixa atividade antioxidante. Os testes histoquímicos evidenciaram que as cavidades secretoras armazenam soluções complexas e contêm, além dos óleos essenciais, outras classes de lipídeos.The seasonality influence on the essential oil composition of trimestrially collected fresh leaves of Eugenia neonitida Sobral and Eugenia rotundifolia Casar. (Myrtaceae) was investigated, as well as the antioxidant activity of dried leaves essential oils, and the leaf histochemistry. Eugenia neonitida essential oil major compounds were bicyclogermacrene, germacrene D, and b-caryophyllene. Eugenia rotundifolia major compounds were a-pinene, b-pinene, and b-caryophyllene. The essential oils of both species were mainly composed by cyclic hydrocarbons and alcohols; sesquiterpenes in E. neonitida and monoterpenes in E. rotundifolia. Precipitation appears to influence both species essential oils composition. Essential oils from dried leaves exhibited weak antioxidant activities. Both species have presented secretory cavities filled with a complex solution of essential oils and other lipid classes, according to histochemical tests.

Seasonal and Antioxidant Evaluation of Essential Oil from Eugenia uniflora L., Curzerene-Rich, Thermally Produced in Situ

“…In E. rotundifolia oil, the main components were α-pinene, β-pinene, and β-caryophyllene. Seasonality did not significantly interfere in the oils of either species, despite the observed qualitative and quantitative variations [29].…”

Essential oil composition of Eugenia langsdorffii O. Berg.: relationships between some terpenoids and toxicity against Tetranychus urticae

“…Moreover, none of the Eugenia species listed in recent review by Stefanello et al 24 showed the presence of epi-longipinanol and 10-epi-g-eudesmol, the major components indentified in the leaf and fruit oils of E. langsdorffii, respectively. On the other hand, the second major component of fruit oil (1,10-epi-cubenol (15.6 ± 0.3%)) was identified in the leaf oil of E. neonitida 25 and Plinia trunciflora 26 in percentage lower than 0.5%.…”

“…24 In fact, these oils were characterized by high percentages of sesquiterpenes (72.2 ± 0.9% in leaves and 92.2 ± 0.2% in fruits), followed by monoterpenes. The monoterpne a-pinene and the sesquiterpenes germacrene D, bicyclogermacrene, β-caryophyllene and β-elemene, which were found in Eugenia species as principal components, [24][25][26][27][28][29] were not detected in the leaf and fruit oils of E. langsdorffii. Moreover, none of the Eugenia species listed in recent review by Stefanello et al 24 showed the presence of epi-longipinanol and 10-epi-g-eudesmol, the major components indentified in the leaf and fruit oils of E. langsdorffii, respectively.…”

Essentials Oils from Brazilian Eugenia and Syzygium Species and Their Biological Activities

“…(syn. E. umbelliflora ) present two chemical profiles, three specimens collected in Rio de Janeiro and São Paulo states (Brazilian southeast) were shown to be rich in α-pinene (15.8–34.5%) and β-pinene (11.0–34.1%) [ 26 , 27 , 28 ]. The specimen from Santa Catarina (Brazil southern) was rich in viridiflorol (17.7%), followed by β- (13.2%) and α-pinene (11.2%) [ 29 ].…”

“…The oil was mainly composed of cyclic monoterpene and sesquiterpene hydrocarbons, as α-pinene (19.7–34.4%), β-pinene (20.6–34.1%), and ( E )-caryophyllene (3.6–11.7%). The rain precipitation data displayed a significant positive and negative correlation between the ( E )-caryophyllene and α-pinene content, respectively [ 26 ].…”