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Essential Oil Composition and Antimicrobial Activity of Lobelia Pyramidalis Wall

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Essential Oil Composition and Antimicrobial Activity of Lobelia Pyramidalis Wall EXCLI Journal 2011;10:274-279 – ISSN 1611-2156 Received: November 18, 2011, accepted: December 04, 2011, published: December 06, 2011 Original article: ESSENTIAL OIL COMPOSITION AND ANTIMICROBIAL ACTIVITY OF LOBELIA PYRAMIDALIS WALL Shivani Joshia*, Devendra Mishrab, Ganga Bishta, Khadak Singh Khetwala a Department of Chemistry, D.S.B. Campus, Kumaun University, Nainital, Uttarakhand, India b Department of Applied Chemistry, Birla Institute of Applied Sciences, Bhimtal, Uttarakhand, India * Corresponding author: Shivani Joshi; Email: [email protected]; Tel: +919917541909, +919568296342 ABSTRACT The essential oil of Lobelia pyramidalis was analyzed by GC and GC-MS. A total of 21 con- stituents comprising 77.88 % of the total oil were identified. Perilla ketone constituted 25.61 % of the oil followed by camphorquinone (12.16 %), dibutyl phthalate (10.66 %) and allyl nonanoate (8.47 %). The antimicrobial activity of the oil was evaluated using the disc diffusion method and the microdilution technique. The results showed that the oil exhibited moderate antimicrobial activity. Keywords: Lobelia pyramidalis, essential oil, perilla ketone, antimicrobial activity, minimal inhibitory concentration. INTRODUCTION period 1805-1809. Thus, during the nine- teenth century Lobelia was one of the most Lobelia is a genus comprising over 200 medicinally important plants and was used species and 22 are found in India. The as a valuable remedy for asthma. Lobelia plants are herbs or shrubs and are often lati- inflata (Indian tobacco), so-called because ciferous (Bhattacharjee, 2008). Lobelia is the native Americans (the Penobscot tribes) reported to possess respiratory stimulant, smoked the dried leaves as a substitute for antiasthmatic, antispasmodic, expectorant, tobacco, was used to produce the effect of and emetic properties. Traditionally, it has alkaloids on the central nervous system been used for bronchitic asthma, chronic (Felpin and Lebreton, 2004). Five alkaloids, bronchitis and, specifically, for spasmodic two triterpenoids and sitosterol have been with secondary bronchitis. It is also used isolated from Lobelia davidii (Zhang et al., topically for myositis and rheumatic nod- 1990). The whole plant of Lobelia inflata L. ules (Ebadi, 2007). Lobelia chinensis L. has contains a variety of piperidine alkaloids been used as a diuretic, an antidote, a he- such as lobeline, which has been used as a mostat, and as carcinostatic agents for respiratory stimulant (Ishimaru et al., stomach cancer in Chinese folk medicine. 1991). The hairy roots of Lobelia sessilifo- Various alkaloids, for example lobeline, lia were shown to be rich in glycosylated lobelanine, and lobelanidine are constitu- polyacetylenes (Ishimaru et al., 1994). Acy- ents of this herb (Shibano et al., 2001). lated cyanidin 3-rutinoside-5,3'-diglucoside Thomson and Cutler reported that Lobelia was also isolated from the purple-red was used for the treatment of asthma in the flower of Lobelia erinus (Saito et al., 1995). 274 EXCLI Journal 2011;10:274-279 – ISSN 1611-2156 Received: November 18, 2011, accepted: December 04, 2011, published: December 06, 2011 Extracts of Lobelia inflata contain lobeline, nel and the solvent was finally evaporated which was found to show positive effects under reduced pressure. The oil yield was on the treatment of multidrug-resistant tu- 0.2 % (w/w). The essential oil was stored mor cells (Ma and Wink, 2008), and the under refrigeration for 3 days and then used leaves contain β-amyrin palmitate, which immediately for the analysis and evaluation possesses sedative and antidepressant prop- of antimicrobial activity. erties. The rhizomes of Lobelia chinensis L. were reported to contain the polyfructosan GC and GC/MS lobelinin, and the plant is used in China to The oil was analyzed using a Nucon treat fever and asthma, and the roots are 5765 GC (30 m × 0.32 mm, FID) with split 2 considered depurative and antirheumatic in ratio 1:48, N2 flow of 4 kg/cm . GC/MS Indo-China. This plant is one of the con- analysis was performed using a thermo- stituents of a tincture formulation used for quest (Vienna, Austria) trace GC-2000 in- the treatment of scars (Khare, 2007). Fur- terfaced with Finnigen MAT Polaries-Q ion thermore, lobeline can be modified to trap mass spectrometer fitted with RTX- lobelane, which was shown to decrease 5MS (Restek Corporation, Pennsylvania, methamphetamine self-administration in USA) fused silica capillary column (30 × rats (Neugebauer et al., 2007). 0.25 mm, 0.25 µm film coating). The oven Lobelia pyramidalis, locally known as temperature was programmed from 60°– Bhanguri, is an endangered herb that gener- 210°C at 3 °C/min using helium as carrier ally occurs at an altitude of 1500-3000 m. gas at 1 ml/min. The injector temperature Its leaves and inflorescence are antispas- was 210 °C; injection volume was 0.1 µL modic (Manandhar, 2002) and used for prepared in hexane, split ratio 1:40. Mass asthma, bronchitis, and fever (Kumari et al., spectra were taken at 70 eV Electron Im- 2011). This plant is also used to treat sciat- pact (EI) with mass scan range of m/z 40- ica and back pain (Bajracharya, 1979). The 450 amu with mass scan time of 4 s. available literature indicates a lack of work published on the chemical composition and Microorganisms biological activity of Lobelia pyramidalis The antimicrobial activity was con- Wall. Therefore, we focused our study on ducted against one gram positive bacteria: the essential oil composition and antimicro- Staphylococcus aureus (ATCC 25923) and bial activity of Lobelia pyramidalis Wall. three gram negative bacteria: Klebsiella pneumoniae (ATCC 22736), Pseudomonas MATERIALS AND METHODS aeruginosa (ATCC BAA-427), Escherichia coli (ATCC 9637), and six fungi Candida Plant material The aerial parts of the plant were col- albicans (MTCC 183), Cryptococcus neo- lected from Daman, Nepal, in the month of formans (ATCC 208821), Sporothrix September, 2010. The plant identification schenckii (MTCC 1359), Trichophyton was confirmed by the Botanical Survey of mentagrophytes (ATCC 9533), Aspergillus India (BSI), Dehradun. A voucher specimen fumigatus (MTCC 343) and Candida (No.113408) was deposited in the Herbar- parapsilosis (ATCC 22019). Required mi- ium Section at BSI, Dehradun, India. croorganisms were procured from the Insti- tute of Microbial Technology, Chandigarh and National Chemical Laboratory, Pune, Extraction of essential oil The fresh aerial parts of Lobelia pyra- India. midalis (10 kg) were steam distilled and the distillate was saturated with NaCl and ex- Antimicrobial activity The antimicrobial activity of essential tracted with n-hexane. Anhydrous Na SO 2 4 oil from the aerial parts of Lobelia pyrami- was then added to dry the organic phase. dalis was tested using the paper disc diffu- This was separated using a separating fun- 275 EXCLI Journal 2011;10:274-279 – ISSN 1611-2156 Received: November 18, 2011, accepted: December 04, 2011, published: December 06, 2011 sion method according to the slightly modi- tions. Levofloxacin and clotrimazole were fied National Committee for Clinical Labo- used as standards. ratory Standards Guidelines (NCCLS, 1997). A suspension (106 CFU/mL) of mi- RESULTS AND DISCUSSION crobial strains was used. The filter paper Chemical composition of Lobelia pyrami- discs (6 mm in diameter, Whatman filter dalis essential oil paper 1) were individually impregnated Steam distillation of the aerial parts of with 10 µL of the essential oil aliquots the plant yielded 0.2 % (w/w) of the essen- (200 mg/mL) and subsequently placed onto tial oil. The oil sample was analyzed by GC the surface of inoculated Petri dishes con- and GC-MS and the constituents were iden- taining Mueller Hinton Agar for bacterial tified on the basis of the retention index, strains and RPMI 1640 agar medium for library mass search database (NIST & fungal strains. The Petri dishes were kept at WILEY) and Adams (Adams, 1995). A to- 4 °C for 2 h and were then incubated for tal of 21 constituents were identified, repre- 24 h at 37 °C for bacterial growth and for senting 77.88 % of the total oil constituents 48 h at 27 °C for fungal growth. The diame- detected (Table 1), which included 54.33 % ters of the inhibition zones were measured monoterpenes. The major constituents of in millimeters, including the diameter of the oil were perilla ketone (25.61 %), cam- each disc. Controls were set up with phorquinone (12.16 %), dibutyl phthalate equivalent quantities of DMSO (Quali- (10.66 %), isobornyl isobutanoate (2.94 %), gens), which was used as a solvent (20 %) isophytol (2.76 %) and 2,5,9-trimethyl de- when preparing the essential oil solution. cane (2.06 %). To the best of our knowl- All of the experiments were performed in edge, this is the first report to determine the triplicate and the results (millimeters of the constituents of the essential oil of this plant. inhibition zone) were expressed as mean values. Antimicrobial activity The essential oil of Lobelia pyramidalis Determination of the minimal inhibitory was studied for its antimicrobial activity. In concentration (MIC) vitro antimicrobial studies were carried out The broth microdilution technique was against bacterial and fungal strains as pre- used to determine the MIC values (NCCLS, viously described. The results obtained for 1999). All of the experiments were per- the zones of growth inhibition (mm) and formed in Mueller Hinton broth for the bac- minimal inhibitory concentrations (MICs) terial strains and RPMI 1640 medium for in Mueller Hinton Agar for bacterial strains the fungal strains. Serial doubling dilutions and RPMI 1640 medium for fungal strains of the essential oil were prepared in a 96- are summarized in Table 2. well microtiter plate ranging from 0.10 to The results showed inhibition zones 200 mg/mL. The prepared microtiter plates against all strains except C. neoformans and containing microorganisms and essential oil K. pneumoniae. The data obtained from the were then incubated at 37 °C for 24 h for disc diffusion method indicated that the es- bacterial growth and at 27 °C for 48 h for sential oil was most active against S.
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