Leaf Oil of Psidium guajava L. from Cuba

Luz

et al. 2003

Flavour & Fragrance J

The essential oils of the leaves and fine stems of Psidium acutangulum, P. striatulum, P. guineense and P. guajava were obtained by hydrodistillation and analysed by GC-MS. The main compounds identified in the oil of P. acutangulum were α-pinene (14.8%), 1,8-cineole (12.9%) and β-pinene (10.1%). The oil of P. striatulum was dominated by β-caryophyllene (28.6%), α-selinene (7.7%), caryophyllene oxide (7.6%) and β-selinene (7.4%). The major constituents found in the oil of P. guineense were β-bisabolol (17.4%), limonene (6.8%) and epi-α-bisabolol (6.7%). The oil of P. guajava was dominated by α-pinene (23.9%), 1,8-cineole (21.4%) and β-bisabolol (9.2%).

Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Essential oils of the leaves and stems of four Psidium spp.

Luz

et al. 2003

Flavour & Fragrance J

“…This compound is one of the main constituents of the essential oil from guava leaves from various countries such as China (18.8%), Cuba (21.6%), Nigeria (21.3%) and Taiwan (27.7%) (Li et al, 1999;Pino et al, 2001;Ogunwande et al, 2003;Chen et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

Composition of the essential oil from the leaves of tree domestic varieties and one wild variety of the guava plant (Psidium guajava L., Myrtaceae)

Lima¹,

Cardoso²,

Andrade³

et al. 2010

Rev. bras. farmacogn.

RESUMO: "Avaliação dos constituintes dos óleos essenciais de folhas de goiabeira (Psidium guajava L., Myrtaceae) de três cultivares e da planta silvestre". Os óleos essenciais de folhas de goiabeira Psidium guajava L. de três diferentes cultivares (Paluma, Século XXI e Pedro Sato) e da planta silvestre foram analisados a fim de comparar os seus constituintes. O óleo essencial foi obtido por hidrodestilação em aparelho de Clevenger modificado. Para a caracterização e quantificação dos compostos presentes por CG-EM e CG respectivamente. Os resultados mostraram que os três óleos essenciais analisados apresentam inúmeras substâncias em comum com a predominância do 1,8-cineol. O óleo essencial da cultivar Paluma se difere dos demais devido a alta concentração de 1,8-cineol (42,68%) e do α-terpineol (38,68%). No óleo essencial da cultivar Século XXI observase a presença do 1,8 cineol (18,83%), trans-carifileno (12,08%) e o selin-11-en-4-α-ol (20,98%) como majoritários, enquanto que a cultivar Pedro Sato e a planta silvestre apresentaram com o 1,8 cineol com (17,68%) e (12,83%), oxido de cariofileno (9,34%) e (9,09%) e o selin-11-en-4-α-ol com (21,46%) e (22,19%), respectivamente.Unitermos: Hidrodestilação, goiabeira, 1,8-cineol, Psidium guajava, Myrtaceae. ABSTRACT:The compositions of the essential oils from the leaves of three domestic varieties of the guava tree Psidium guajava L. (Paluma, Século XXI and Pedro Sato) and of one wild variety were compared. Essential oils were extracted by steam distillation, the components were identified by gas chromatography coupled to mass spectrometry GC-MS, and the apparent concentrations were determined by gas chromatography with a flame ionization detector. The results demonstrated that the three essential oils contained many common substances with a prevalence of 1,8-cineole, whereas the essential oil of the Paluma variety contained 1,8-cineole (42.68%) as the major constituent, as well as α-terpineol (38.68%). The principal components of the essential oil of the Século XXI variety were 1,8-cineole (18.83%), trans-caryophyllene (12.08%), and selin-11-en-4-α-ol (20.98%), while those of the Pedro Sato variety and of the wild plant were 1,8-cineole (17.68%) and (12.83%), caryophyllene oxide (9.34%) and (9.09%), and selin-11-en-4-α-ol (21.46%) and (22.19%), respectively.

“…Craveiro et al (1981), Cuellar et al (1984), and Pino et al (2001) characterized the essential oil of guava leaves and identified 21 compounds, including α-humulene, trans-caryophyllene, and selin-11-en-4α-ol.…”

Section: Resultsmentioning

confidence: 99%

Effect of natural and artificial drying of leaf biomassof Psidium guajava on the content and chemical composition of essential oil

Alves

et al. 2016

SCA

Psidium guajava L. is native to Central and South America. It is widely distributed and well adapted to Brazil, a producer of essential oils rich in terpenes. The objective of this study was to evaluate the effects of natural and artificial drying on the content and chemical composition of the essential oil of guava leaves (Psidium guajava L.) grown in Rio Verde (GO). The two treatments consisted of drying fresh leaves either naturally in the shade or artificially at 40°C. Chemical composition was analyzed qualitatively and quantitatively by gas coupled with mass spectrometer chromatography (GC/MS) and gas chromatography using a flame ionizer (GC-FID), respectively. The method of drying changed the content and chemical composition of the essential oil of guava leaves. Drying in the shade reduced the content and altered the constituents of the essential oil, whereas drying in an oven at 40°C, despite having reduced the amounts of the constituents, exhibited the highest essential oil content and increased the concentration of certain major constituents as compared to that in the natural shade drying method. The major components found in the essential oil of leaves regardless of the drying processes were transcaryophyllene, α-humulene, aromadendrene, α-selinene, and selin-11-en-4α-ol. According to reports in the literature, these compounds possess fungicidal, insecticidal, antimicrobial, and anti-inflammatory activity, among others beneficial actions. Key words: Hydrodistillation. Guava. Myrtaceae. Medicinal plants. ResumoPsidium guajava L. é uma planta nativa da América Central e do Sul, que está amplamente distribuída e bem adaptada no território brasileiro, produtora de óleo essencial rico em terpenos. O objetivo deste estudo foi avaliar o efeito da secagem natural e artificial sobre o teor e a composição química do óleo essencial das folhas de goiabeira (Psidium guajava L.), cultivada em Rio Verde (GO). Os tratamentos avaliados foram: folhas frescas; secagem natural à sombra e secagem em estufa a 40ºC. A composição química qualitativa e quantitativa foi analisada por cromatografia gasosa acoplada ao espectrômetro de massa (CG/MS) e cromatógrafo gasoso com ionizador de chama (CG-FID), respectivamente. O tipo de secagem alterou o teor e a constituição química do óleo essencial das folhas de goiabeira. A secagem a sombra reduziu o teor e a quantidade de constituintes do óleo essencial, enquanto a secagem em estufa a 40ºC apesar de ter reduzido a quantidade de constituintes, apresentou o maior teor de óleo essencial e aumentou a concentração de alguns constituintes majoritários em relação à secagem natural a sombra. Os componentes majoritários encontrados tanto no óleo essencial das folhas in natura quanto no óleo essencial obtido das folhas submetidas aos processos de secagem foram trans-cariofileno, α-humuleno, aromadendreno, α-selineno e o selin-11-en-4α-ol, e segundo relatos na literatura estes compostos possuem atividades fungicidas, inseticidas, antimicrobianas, anti-inflamatórias, entre outras. Palav...