Investigation of Essential Oils ofPlectranthus glandulosusHook f. (Lamiaceae) from Cameroon

Ngassoum, Martin Benoît; Jirovetz, Leopold; Buchbauer, Gerhard; Fleischhacker, W.

doi:10.1080/10412905.2001.9699615

Cited by 26 publications

(22 citation statements)

References 14 publications

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“…Various works have been carried out to identify the chemical constituents of the genus (Vera et al, 1993;Liu;Ruedi, 1996;Ngassoum et al, 2001;Abdel-Mogib et al, 2002;Kerntopf et al, 2002;Mendes et al, 2006), and to investigate their antioxidant (Burgi;Ruedi, 1993;Juch;Ruedi, 1997;Narukawa et al, 2001), antimicrobial (Rabe;Van Staden, 1998;Zollo et al, 1998;Mathpal et al, 2002;Rijo et al, 2002;Gaspar-Marques et al, 2006;Oliveira et al, 2007b) and pharmacological properties (Buznego;Perez-Saad, 1999;Cerqueira et al, 2004;Uawonggul et al, 2006). An extensive review of ethnobotanical uses of Plectranthus has been presented by Lukhoba et al (2006).…”

Section: Introductionmentioning

confidence: 99%

Stem and leaf anatomy of Plectranthus neochilus Schltr., Lamiaceae

Duarte¹,

Lopes²

2007

Rev. bras. farmacogn.

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RESUMO: "Anatomia caulinar e foliar de Plectranthus neochilus Schltr., Lamiaceae". Plectranthus neochilus Schltr. é uma erva aromática denominada boldo ou "boldo-gambá" e empregada no tratamento de insufi ciência hepática e dispepsia na medicina popular. Este trabalho investigou a anatomia caulinar e foliar, com a fi nalidade de contribuir na identifi cação dessa planta medicinal. O material botânico foi preparado de acordo com microtécnicas usuais. O caule tem secção transversal quadrangular e, em crescimento secundário no nível analisado, exibe epiderme unisseriada e numerosos tricomas. Os tricomas glandulares são capitados e peltados. Os primeiros têm pedicelo curto e unicelular ou longo e pluricelular e cabeça uni ou bicelular. Os peltados apresentam pedicelo curto e cabeça ovóide com oito células. Os tricomas tectores são pluricelulares, unisseriados e recobertos com cutícula granulosa. Observam-se colênquima angular, câmbio vascular formando fl oema em direção centrífuga e xilema para o centro, e calotas de fi bras perivasculares apostas ao fl oema. A lâmina foliar tem epiderme uniestratifi cada revestida por cutícula estriada, estômatos diacíticos em ambas as superfícies, numerosos tricomas similares aos do caule e mesofi lo homogêneo. A nervura central possui um ou dois feixes vasculares colaterais e o pecíolo apresenta vários feixes colaterais em arco aberto. Unitermos: Plectranthus neochilus, Lamiaceae, anatomia, boldo-gambá, tricomas.ABSTRACT: Plectranthus neochilus Schltr. is an aromatic herb named "boldo" or "boldogambá" and employed for treating hepatic insuffi ciency and dyspepsia in folk medicine. This paper has investigated its stem and leaf anatomy, in order to contribute for the medicinal plant identifi cation. The botanical material was prepared according to standard microtechniques. The stem has quadrangular transection and, in secondary growth at the level analyzed, shows uniseriate epidermis and numerous trichomes. The glandular ones are capitate and peltate. The former has short unicellular or long multicellular stalk and uni-or bicellular head. The latter presents short stalk and eight-celled ovoid head. The non-glandular trichomes are multicellular, uniseriate and coated with granular cuticle. It is observed angular collenchyma, cambia forming phloem outward and xylem inward, and perivascular fi ber caps next to the phloem. The blade has uniseriate epidermis coated with striate cuticle, diacytic stomata on both surfaces, numerous trichomes similar to the stem ones, and homogeneous mesophyll. The midrib shows one or two collateral bundles and the petiole has many of them distributed as an open arc.

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Section: Introductionmentioning

confidence: 99%

Stem and leaf anatomy of Plectranthus neochilus Schltr., Lamiaceae

Duarte¹,

Lopes²

2007

Rev. bras. farmacogn.

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“…The main monoterpene hydrocarbons were terpinolene (25.2% and 7.7%), limonene (3.2% and 1.7%) and myrcene (2.2% and 1.6%). The sesquiterpene derivatives were found in a very low percentage (<2.5%), represented mainly by germacrene D (1.4% and 1.0%) (Ngassoum et al, 2001). In the same vein, the volatile constituents of the dried powdered leaf essential oil from the same plant revealed the presence of thymol (3.7%), terpineolene (8.2%), fenchone (18.3%), piperitone epoxide (17.7%), piperitone oxide (8.9%), piperitone (1.2%), diosphenol (2.5%) and cis-piperitone (19.5%) (Nukenine et al, 2007).…”

Section: Discussionmentioning

confidence: 98%

“…This plant is found in West Africa flora (Ngassoum et al, 2001) and also in Cameroon flora (Nukenine et al, 2013). Still in Cameroon, it is plant whose leaves are commonly used to protect stored grains and flour (Nukenine et al, 2013;Goudoum et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Larvicidal and Pupicidal Toxicities of Plectranthus glandulosus and Callistemon rigidus Leaf Essential Oils against Three Mosquito Species

Pierre¹,

Nchiwan²,

Okechukwu³

et al. 2014

jmr

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Objective: To determine the mosquito larvicidal and pupicidal activities of Cameroonian Plectranthus glandulosus and Callistemon rigidus leaf essential oils against 4 th instar larvae and early pupae of Anopheles gambiae, Aedes aegypti and Culex quinquefasciatus. Methods Conclusion:These results suggest that the Cameroonian P. glandulosus and C. rigidus leaf essential oils can be used as an ideal eco-friendly approach which may replace DDVP, the synthetic chemical, for vector control programs.

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“…One of such alternatives is the use of natural plant preservatives such as essential oils, to prevent the proliferation of fungi or protect food from oxidation. Lippia rugosa and Plectranthus glandulosus are a potential source of essential oils in Cameroon and other tropical areas (Ngassoum et al, 2001;Ngassoum et al, 2005;Tatsadjieu et al, 2008). L. rugosa is a robust woody perennial plant of the Verbenacea family up to 12 feet high with large oblong-lanceolate bluish-green leaves, pleasant aromatic flowers (Oliver -Bever, 1982).…”

Section: Introductionmentioning

confidence: 99%

“…P. glandulosus (Lamiacea) is plant whose leaves are commonly used to protect stored grains, as mosquito repellent and anthelminthic in Cameroon (Nukenine et al, 2003). In the Adamaoua province, the plant is used in folk medicine for treatment of colds and sore throat (Ngassoum et al, 2001). This paper describes the chromatographic examination of the volatile oils extracted from these plant materials as well as bioassays for evaluating their antifungal activities against Aspergillus flavus, Aspergillus niger and Fusarium moniliforme, and antiradical activities.…”

Section: Introductionmentioning

confidence: 99%

Mycelia growth inhibition of some Aspergillus and Fusarium species by essential oils and their potential use as antiradical agent

Aoudou¹,

Léopold²

2011

ABJNA

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The essential oils extracted from Lippia rugosa and Plectranthus glandulosus leaves from Cameroon were analysed by GC-MS and evaluated for their antifungal activities against Aspergillus flavus, Aspergillus niger and Fusarium moniliforme common fungi causing spoilage of stored food product, and antiradical activities. The disc diffusion method was used to evaluate the fungal growth inhibition at various concentrations of oils while the antiradical activity was studied by the DPPH (diphenyl picryl hydrazyl) method. The main components found in P. glandulosus leaves oil were terpinolene (30.8%), fenchone (13.2%), terpene 4-ol (11%) and piperitenone oxyde (8%) whereas L. rugosa leaves oil is mainly constituted of thymol (26.7%), p-cymene (15.5%), thymol acetate (13.2%) and γ-terpinene (9.4%). L. rugosa exhibited the lowest MIC value in liquid medium ranged from 0.2 to 0.3 mg/ml against all fungal strain, and P. glandulosus which was less active with value ranged from 0.8 to 1mg/ml against all fungal strain. The antiradical activity of L. rugosa essential oil (SC 50 = 6.7 g/l) was less than that of butylated hydroxyl toluene (BHT) which was used as the reference compound (SC 50 = 0.007 g/l). Results obtained in the present study indicate the possibility of exploiting these essential oils in the fight against strains of A. flavus, A. niger and Fusarium moniliforme responsible for biodeterioration of stored food products.

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Investigation of Essential Oils ofPlectranthus glandulosusHook f. (Lamiaceae) from Cameroon

Cited by 26 publications

References 14 publications

Stem and leaf anatomy of Plectranthus neochilus Schltr., Lamiaceae

Stem and leaf anatomy of Plectranthus neochilus Schltr., Lamiaceae

Larvicidal and Pupicidal Toxicities of <i>Plectranthus glandulosus</i> and <i>Callistemon rigidus</i> Leaf Essential Oils against Three Mosquito Species

Mycelia growth inhibition of some Aspergillus and Fusarium species by essential oils and their potential use as antiradical agent

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