Chemical Composition of the Essential Oil of<i>Plectranthus melissoides</i>Benth

Mallavarapu, Gopal R.; Ramesh, S.; Mengi, N.; Kalra, Alok

doi:10.1080/10412905.2005.9698895

Cited by 10 publications

(9 citation statements)

References 8 publications

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“…1993), Plectranthus amboinicus (Vera et al. 1993) and Plectranthus melissoides (Mallavarapu et al. 2005) which have carvacrol and cymene as their major components.…”

Section: Discussionmentioning

confidence: 99%

Antimicrobial activity and the major components of the essential oil ofPlectranthus cylindraceus

Marwah

Fatope

Deadman

et al. 2007

Journal of Applied Microbiology

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Aims: The traditional uses of the aerial parts of fresh Plectranthus cylindraceus by the Dhofaris in Oman were investigated on the basis of antimicrobial properties and composition of its herb oil. Methods and Results: The minimal inhibitory concentration (MIC) values of the herb oil of P. cylindraceus against human pathogenic bacteria and yeast were assessed using the broth microdilution method, and the percentage growth inhibition of fungi was determined according to the poisoned food technique. The oil exhibited good activity against Klebsiella pneumoniae, Staphylococcus aureus, Bacillus subtilis and Candida albicans with MIC values in the range of 7·8–62·5 μg ml−1 and also inhibited the growth of Microsporum canis, Microsporum gypseum, Trichophyton rubrum, Alternaria alternata, Bipolaris sp., Curvularia lunata, Fusarium oxysporum and Stemphylium solani for about a week at 250 μg ml−1. The two most abundant components of the oil were identified as carvacrol (46·8%) and α‐terpinolene (18·2%) based on gas chromatography‐mass spectra (GC‐MS) and 13C nuclear magnetic resonance (NMR) analyses. Conclusions: The oil has a pleasant odour and showed broad spectrum antimicrobial activity. Such bioactivity could be attributed in part to carvacrol. Significance and Impact of the Study: This study has demonstrated the broad spectrum antimicrobial activity of the herb oil of P. cylindraceus as well as the organic composition of this plant extract. This study provides scientific insight into the ancient practice of utilizing P. cylindraceus as a fragrant disinfectant.

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“…1993), Plectranthus amboinicus (Vera et al. 1993) and Plectranthus melissoides (Mallavarapu et al. 2005) which have carvacrol and cymene as their major components.…”

Section: Discussionmentioning

confidence: 99%

Antimicrobial activity and the major components of the essential oil ofPlectranthus cylindraceus

Marwah

Fatope

Deadman

et al. 2007

Journal of Applied Microbiology

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“…P. melissoides contained mostly oxygenated monoterpenes and monoterpene hydrocarbons. The main components of the oil were carvacrol (41.3%), p-cymene (17.4%), g-terpinene (10.1%), methyl thymol (3.0%), thymol (7.9%), and carvacrol acetate (4.6%), as analyzed by GC and GC/MS [18]. When examining P. rugosus essential oil by GLC, NMR, and MS analyses, the main constituents identified were germacrene D, caryophyllene, a-pinene, a-phellandrene, caryophyllene oxide, d-cadinene, p-cymene, a-cadinol, limonene, b-phellandrene, and myrcene [9].…”

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confidence: 99%

“…Tormentic acid (14) and a-amyrine (15) were found in P. caninus collected in Mannanur, Andhra Pradesh [31]. Five triterpenoids, namely, plectranthoic acid A (16), plectranthoic acid B (17), plectranthadiol (18), acetylplectranthoic acid (19), and plectranthoic acid (20), as well as the phytosterol b-sitosterol (24), were isolated from P. rugosus [32] [33] [44]. Moreover, the triterpenes oleanolic acid (21), ursolic acid (22), and betulin (23), in addition to 24 and hexacosanol, were isolated from the same species by Misra et al [34].…”

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confidence: 99%

The Genus Plectranthus in India and Its Chemistry

Waldia

Joshi

Pathak

et al. 2011

Chemistry & Biodiversity

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Phytochemical constituents isolated from Indian species of the genus Plectranthus reported up to 2009 are compiled. In India, the genus Plectranthus is found in all the habitats and altitudes, particularly in the Himalaya, the Southern Ghats, and the Nilgiri region. P. amboinicus, P. barbatus, P. caninus, P. mollis, P. coetsa, and P. incanus are the most common species found in India. Phytochemical studies of the genus revealed that Indian Plectranthus species are rich in essential oil, and that the most abundant secondary metabolites are diterpenoids, i.e., labdanes, abietanes, and ent-kauranes, as well as triterpenoids.

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“…thymol, carvacrol as well as their biogenetic precursors, p-cymene and -terpinene, in their various species also corroborates that these two genuses are closely related. The essential oils of P. melissoides, P. ambionicus and P. aromaticus investigated earlier from India were composed of mainly phenolic compounds (Mallavarapu et al, 1999(Mallavarapu et al, , 2005Singh et al, 2002). However, in this analysis, these compounds viz.…”

Section: Resultsmentioning

confidence: 59%

“…Phenolic compounds viz. thymol, carvacrol, methyl thymol as well as their biogenetic precursors, p-cymene and -terpinene, were reported as the major constituents of Plectranthus tenuiflorus, Plectranthus melissoides, Plectranthus ambionicus and Plectranthus aromaticus (Khorsid, Ali, Alsofyani, & Albar, 2010;Mallavarapu, Ramesh, Mengi, & Kalra, 2005;Mallavarapu, Rao, & Ramesh, 1999;Mwangl, Lwande, & Hassanali, 2006;G. Singh, O.P.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of volatile oil compositions of twoPlectranthusspecies from northern India

Padalia

Verma

2011

Natural Product Research

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The leaf and inflorescence essential oils of Plectranthus rugosus Wall. (syn. Rabdosia rugosa Wall.) and Plectranthus incanus L. (syn. Plectranthus mollis L.), which grow wild in Uttarakhand, India, were analysed and compared by capillary gas chromatography and gas chromatography-mass spectrometry. The analysis led to the identification of 43 constituents, forming 89.5-93.6% of the total oil compositions. Both leaf and inflorescence oil of P. rugosus were dominated by sesquiterpene hydrocarbons (71.8%, 71.7%) represented by β-caryophyllene (36.2%, 29.8%), germacrene D (25.2%, 28.2%) and α-humulene (6.6%, 8.6%) as the major constituents. Conversely, the leaf and inflorescence oil of P. incanus were dominated by monoterpenoids (74.4%, 65.8%) with piperitenone oxide (44.2%, 38.5%), piperitone (8.6%, 12.2%) and terpinolene (14.5%, 10.2%) as major constituents. Piperitenone oxide, piperitone, cis- and trans-piperitols and trans-piperitol acetate were the marker constituents in P. incanus, which were not noted in the essential oil of P. rugosus.

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Chemical Composition of the Essential Oil ofPlectranthus melissoidesBenth

Cited by 10 publications

References 8 publications

Antimicrobial activity and the major components of the essential oil ofPlectranthus cylindraceus

Antimicrobial activity and the major components of the essential oil ofPlectranthus cylindraceus

The Genus Plectranthus in India and Its Chemistry

Comparative study of volatile oil compositions of twoPlectranthusspecies from northern India

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