ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF SWEET BASIL OILS
HTML Full TextReceived on 08 April, 2013; received in revised form, 08 October, 2013; accepted, 28 December, 2013; published 01 January, 2014
ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF SWEET BASIL OILS
H.C. Srivastava, Pankaj Shukla, Sonia Tripathi* and Bramh Shanker
Department of Chemistry, Research lab, D.B.S. College (R.L.D.B.S.C.), Kanpur- 208006, Uttar Pradesh, India
ABSTRACT: The present study explores the chemical composition, antimicrobial and antioxidant activities of
sweet basil (Ocimum basilicum). Sweet basil essential oil was extracted using a Clevenger type apparatus. The oil yield of sweet basil was found to be 0.171%. A total of 75 compounds representing 99.9% of Sweet basil oil were identified. Linalool (69.85%) was identified as the major component present in sweet basil oil, followed by geraniol (10.850%), 1,8-cineole (6.430%), _ bergamotene (1.635%) and geranyl acetate (1.350%). sweet basil essential oil exhibited strong antibacterial activity against all the bacteria tested except Pseudomonas putida and Pseudomonas aeruginosa. The strongest inhibition activity of Sweet basil was observed against Streptococcus pneumoniae 2 (60 mm), Hemophilus influenzae (45 mm), Candida albicans (45 mm), S. pneumoniae 1 (37 mm) and Aspergillus niger (35 mm). Total antioxidants content quantified in Sweet basil essential oil using a commercial kit were found to be 50.32±1.8 mM. The essential oil extracted from Sweet basil was found to have higher linalool content, antimicrobial and antioxidant activities than most of earlier reported values. In this regard, this variety can be very useful for medical purposes and in food and perfumery industries
Keywords: |
Ocimum basilicum,Sweet basil, Antimicrobial and Antioxidant activities
INTRODUCTION:Basil called sweet basil in India (Ocimum basilicum L.) belonging to the plant family Lamiaceae is an annual plant usually producing white-purple flowers 1. Basil can be distinguished from other basil varieties due to its height and different look. It is consumed as a seasoning in dry and fresh form. The preservative effect of many plant spices and herbs suggests the presence of antioxidative and antimicrobial constituents in their tissues. The economic value of basil essential oil is well known all-around the world due to its utilization for cookery, pharmaceutical and cosmetic purposes.
Traditionally basil is used in folk medicine due to its stimulant, carminative and antispasmodic properties 2, 3. The medicinal value of any plant depends on bioactive phytochemical constituents that produce definite physiological action in the human body. Bioactive phytochemical constituents like alkaloids, phenolics, flavonoids, essential oils, tannins and saponins are usually responsible for medicinal importance of herbal plants 4, 5.
Antioxidants obtained from natural plant sources are more potent and safe due to their harmless nature. Medicinal plant and wild herbs are always under investigation due to these facts 4. Basil is one of the most important medicinal and aromatic plants because of the continuous and increase demand of its products from the local and international markets. Basil essential oil is extensively used for flavouring food stuffs such as sources, vinegars, pickles, ketchups, beverages, condiments and confectionery goods. Basil essential oil is also important part of toiletry products such as mouth washes and dental creams. In perfumery basil essential oil is used for compounding certain popular perfumes and jasmine blends.
Basil is also recognized as a febrifuge and antimalarial plant. Thus, infusion of the plant is used for gouty joints, cephalalgia and gargle for foul breath. Relief in irrigation for throat, earache and ring worm is also well known properties of basil extracts 6.
The purpose of this study was to evaluate Indian basil as a new potential source of natural antioxidants and phenolic compounds. Our study also first time explores essential oil composition, antimicrobial and antioxidant activities of Indian basil.
MATERIALS AND METHODS:
Plant material: Indian basil seeds (O. basilicum L.) were collected from small farmers, home gardens and wild areas in Katarniya forest Lakhimpur (U.P.) and were grown to the flowering stage at A.N.D. Agriculture College Kumar Ganj Faizabad (U.P.). Seeds of Indian basil were grown in a sterilized soil mixture in 6 inch deep plastic trays. After two months these seedlings of sweet basil were transferred to shade house. Sweet basil plants started flowering after three months
Chemical reagents: All chemicals used in the present study were of analytical grade and obtained from Deva Industrial Corporation Lakhanpur Housing Society Kanpur.
Essential oil extraction: On flowering stage fifty basil plants were harvested and essential oil was extracted from them using Clevenger type distillation apparatus. Sweet basil biomass was weighed (3 kg) and cut into small pieces and subjected to hydrodistillation for 5 h. The essential oil was separated from aqueous layer usi
ng a 100 mL capacity separatory funnel. The collected essential oil was dried over anhydrous sodium sulphate and filtered using a Whatman filter paper no. 40. The extracted essential oil was yellow-greenish liquid in appearance which was stored at 4°C in dark brown 5-mL capacity sample bottle until analysis.
Characterization of constituents in essential Oil: The oils obtained were immediately analyzed using gas chromatography-mass spectrometry (GC-MS) to identify the chemical constituents present in the essential oils. The essential oils were analyzed with MS Clarus 600 Perkin Elmer equipped with FID detector. Column ULTRA-1 (0.20 mm x 25 m x 0.33 _m) packed with 100% dimethyl polysiloxane was used. The carrier gas used was helium with a flow rate 1.0 mL/min. Temperature was kept at 45°C for 6 min and programmed to reach 250°C for 10 min at the rate of 3°C per min with hold up time of 2min. Both injection and detection temperature of sample is adjusted at 250°C. Identification of individual compounds was based on the comparison of mass spectra of compound with mass spectra data base (NIST Mass Spectral Library v 2.0a 2002).
Antimicrobial testing: The antimicrobial activity of different essential oils was evaluated by the diffusion method. Briefly, the test was performed in sterile Petri dishes (100 mm diameter) in solid and sterile Muller–Hinton agar medium (Chocolate agar and Blood agar medium were used for Hemophilus species, and S. pneumoniae, respectively). The oils were adsorbed on sterile filter paper discs (10 μl per disc of 5 mm diameter) and placed on the surface of the media previously inoculated with a sterile microbial suspension (one microorganism per petri dish). All Petri dishes were sealed with sterile laboratory films to avoid eventual evaporation of the test samples, then incubated at 37°C (in some experiment with 5% CO2) for 24h, followed by the measurement of the zone diameter of the inhibition expressed in mm. The experiment was done in duplicate.
Total antioxidants content: Total antioxidants content was quantified for basil oil using a commercial kit (F.F.D.C (Fragrance and flavor Development Corporation) Kannuj (U.P.) and the measurements were of 10 samples (n = 10); mean ± SD. A summary of assay used for total antioxidant content determination is as follow: A colorimetric method using Randox assay kit (F.F.D.C (Fragrance and flavor Development Corporation) Kannuj (U.P.) was used to measure TAC.
The assay is based on the incubation of 2, 2’-azino-di-(3-ethylbenzithazioline sulphonate) ABTS with a peroxidase (methmyoglobin) and hydrogen peroxide to produce the radical cation ABTS+ which has a relatively stable blue-green color, measured at 600 nm. Antioxidants in the assayed samples inhibit the oxidation of ABTS to ABTS+ (cause suppression of the color production) to a degree that is proportional to their concentration. The capacity of the antioxidants was compared with that of standard Trolox, a water soluble tocopherol analogue, which is widely used as a traditional standard for TAC measurement assays.
RESULTS AND DISCUSSION:
Yield of essential Oil: Sweet basil essential oil was extracted using specially designed Clevenger type apparatus. Hydrodistillation is thought to be a suitable method to extract volatile components of essential oil. Besides, this is also one of the economical methods. The Sweet basil plants were bushy type with height more than 40 inches (Figures 1 and 2).
The biomass harvested per plant was 0.3222 ± 0.0112 kg. All soft parts of Sweet basil plants were used for extraction of essential oil. The harvesting of biomass was done in month of May. The oil yield of Sweet basil was found to be 0.171 ± 0.0112% (Table 1). A great variation in the essential oil content among the basil accessions, ranging from 0.07 to 1.92% was observed 7 in a previous study.
FIGURE 1: OCIMUM BASILICUM
FIGURE 2: OCIMUM BASILICUM GROWN IN SHADE HOUSE
TABLE 1: BIOMASS AND OIL YIELD OF SWEET BASIL
Harvested biomass per 50 plants | % oil yield | % moisture contents |
16.00 kg | 0.167 ±0.0110 | 78.63 ± 1.30 |
The essential oil content and composition in medicinal and aromatic plants is affected primarily by plants genotypes and other conditions such as soil and climatic conditions, growing techniques, harvest time, irrigation, as well as fertilization 8-10. The physical and chemical properties of Sweet basil oil (Table 2) although not same but comparable to a previous study 11.
TABLE 2: PHYSICAL AND CHEMICAL PROPERTIES OF SWEET BASIL OIL
Appearance | Yellow-greenish liquid |
Odor | Sweet, Pungent and typical aromatic odor |
Solubility | Soluble in all Proportion of 90% alcohol |
Boiling point | 215±2°C |
Specific gravity | 0.860± 0.950 @ 25°C |
Optical rotation | --5.0 ±0.040 @ 25°C |
Refractive index | 1.4530± 1.510 @ 25°C |
Acid value | Neutral to Litmus |
Ester value | ~ 30 |
Determination of essential oil content and composition of sweet basil oil: The essential oil contents and components identified in the herbage of Sweet basil are tabulated in Table 3, together with their relative percentages. A total of 75 compounds representing 99.9% of Sweet basil oil were identified. Linalool was identified as the major component present in Sweet basil oil (69.85%), followed by geraniol (10.85%), 1, 8-cineole (6.430%), a-bergamotene (1.635%) and geranyl acetate (1.35%). Sweet basil mainly consisted of oxygenated monoterpenes followed by sesquiterpene hydrocarbons and oxygenated sesquiterpenes. Linalool was also found as a main component in basil oil in previous studies 11-15.
TABLE 3: GC-MS ANALYSIS OF SWEET ESSENTIAL OIL
Peak | Compound name | Area % |
1 | 3-hexen-1-ol | 0.010 |
2 | α-Pinene | 0.105 |
3 | Camphene | 0.035 |
4 | Sabinene | 0.202 |
5 | 2- 3 -Pinene | 0.360 |
6 | 1 -Octen-3-ol | 0.969 |
7 | 3 -Myrcene | 0.520 |
8 | 3-octanol | 0.080 |
9 | cis-3-hexenyl acetate | 0.001 |
10 | α-Terpinene | 0.020 |
11 | Ortho-Cymene (cymol) | 0.002 |
12 | Limonene | 0.290 |
13 | 1,8-Cineole | 6.430 |
14 | 3-cis-Ocimene | 0.022 |
15 | 3-trans-ocimene | 0.225 |
16 | y-Terpinene | 0.035 |
17 | cis-Sabinene hydrate | 0.040 |
18 | 1 -octanol | 0.173 |
19 | Linalool | 69.85 |
20 | Octenyl acetate | 0.005 |
21 | fenchyl alcohol | 0.011 |
22 | 2-Cyclohexen-1-ol | 0.008 |
23 | Camphor | 0.570 |
24 | Trans-chrysanthemal | 0.005 |
25 | Bicylogermacrene | 0.010 |
26 | Isoborneol | 0.010 |
27 | 4-Terpineol | 0.120 |
28 | Limonene oxide | 0.014 |
29 | α-Terpineol | 0.609 |
30 | Myrtenol | 0.069 |
31 | p-Allylanisole | 0.670 |
32 | Acetic acid,decyl ester | 0.045 |
33 | Fenchyl acetate | 0.060 |
34 | Nerol (cis-geraniol) | 0.257 |
35 | Pulegone | 0.012 |
36 | z-citral | 0.323 |
37 | Geraniol | 10.850 |
38 | Carvone | 0.500 |
39 | E-citral | 0.409 |
40 | L-Bornyl acetate | 0.070 |
41 | Tridecane | 0.013 |
42 | Myrtenyl acetate | 0.030 |
43 | Acetic acid 1,3,3, trimethyl-2--oxabicyclo[2.2.2] oct-6-yl ester | 0.050 |
44 | Eugenol | 0.075 |
45 | Geranic acid | 0.102 |
46 | Geranyl acetate | 1.350 |
47 | Elemene | 0.060 |
48 | -Cubebene | 0.009 |
49 | Methyleugenol | 0.063 |
50 | Trans--bergamotene | 0.014 |
51 | Trans-caryophyllene | 0.028 |
52 | -Bergamotene | 1.635 |
53 | Sesquiphelandrine | 0.022 |
54 | -Humulene | 0.025 |
55 | Farnesene | 0.038 |
56 | epi-Bicyclosesquiphellandrene | 0.045 |
57 | Germacrene-D | 0.065 |
58 | trans- _ -Farnesene | 0.109 |
59 | Bicylogermacrene | 0.301 |
60 | Germacrene A | 0.272 |
61 | -Guaiene | 0.312 |
62 | -Bisabolene | 0.014 |
63 | -Amorpherene | 0.268 |
64 | -Sesquiphellandrene | 0.065 |
65 | -Cadinol | 0.015 |
66 | -Cadinene | 0.004 |
67 | Sesquisabinene hydrate | 0.019 |
68 | (+)-Aromadendrene | 0.010 |
69 | trans-Nerolidol | 0.035 |
70 | Spathulenol | 0.001 |
71 | Cubenol | 0.112 |
72 | tau.-Cadinol | 0.655 |
73 | -Eudesmol | 0.043 |
74 | -Cadinol | 0.030 |
75 | -Bisabolol | 0.025 |
Total | 99.9 |
Jirovetz and Buchbauer 14 found a high level of linalool (71.4%) in O. basilicum essential oil from Bulgaria. Bulgarian basil oil is considered as a high quality essential oil due to higher linalool contents. Omani basil essential oil was also found to contain linalool as a major constituent (69.9%). Linalool is a naturally-occurring terpene alcohol found in many spices and flowers. Linalool due to its floral pleasant scent has many commercial applications in perfumed hygiene products and cleaning agents including soaps, detergents, shampoos, and lotions. Linalool is also used as a chemical intermediate in synthesis of vitamin E. Additionally; linalool is used by pest professionals as a flea and cockroach insecticide 16, 17, 12, 13. In a study, it was found that inhaling linalool can reduce stress in lab rats. The findings could form the basis of new blood tests for identifying fragrances that can soothe stress 18.
Antimicrobial activity: The antimicrobial activity of Sweet basil oil was tested against thirteen highly pathogenic bacteria is shown in Table 4. Sweet basil essential exhibited strong antibacterial activity against all the bacteria tested except P. putida and P. aeruginosa, which were found highly resistant to Sweet basil oil. The antimicrobial activity of basil was evaluated by measuring the zone of inhibition. The strongest inhibition activity of Sweet basil was observed against S. pneumoniae 2 (60 mm), H. influenza (45 mm), C. albicans (45 mm), S. pneumoniae 1 (37 mm) and A. niger (35 mm). S. pneumoniae, or pneumococcus, is a member of the genus Streptococcus. This gram positive bacteria is α-hemolytic and bile soluble aerotolerant anaerobe.
TABLE 4: SEASONAL VARIATION IN ANTIMICROBIAL ACTIVITY OF OCIMUM BASILICUM ESSENTIAL OILS
Tested organism | Essential oils | Linlool | Amoxicillin | Flumequine | |
Diameter of inhibition zone (mm)A | |||||
P. putida | 21.2±1.2 | 26.9±1.2 | 29.3±1.0 | - | |
P. aeruginosa | 16.1±1.0 | 22.3±1.0 | 31.1±1.2 | - | |
S. pneumoniae | 60 ± 1.3 | 25.3 ± 1.1 | 28.2 ± 1.1 | - | |
H. influenzae | 45 ± 0.6 | 19.5 ± 1.1 | 21.4 ± 0.8 | - | |
C. albicans | 45 ± 0.7 | 21.4 ± 1.0 | - | 23.2 ± 1.1 | |
A. niger | 18.4± 1.2 | 23.3 ± 0.8 | - | 26.1 ± 0.9 |
In past, it was found as a major cause of pneumonia and other diseases including otitis media, acute sinusits, meningitis, sepsis, bacteremia, osteomyelitis, septic arthritis, peritonitis, pericarditis, cellulitis, brain abscess and endocarditis. S. pneumoniae is also a common cause of bacterial meningitis in adults and children and dogs and is one of the top two isolates found in ear infection, otitis media 19. H. influenzae, formerly called Pfeiffer's bacillus or Bacillus influenzae, is a non-motile Gram-negative rod shaped bacterium.
Naturally-acquired disease caused by H. influenzae seems to occur in humans only. H. influenzae cause dieases in human only when other factors such asa viral infection or reduced immune function held. Both S. pneumoniae and H. influenzae can be found in thehuman upper respiratory system 20, 21.
Candida albicans is a diploidfungus (a form of yeast) specially found in immuno-compromised patients (e.g., AIDS, cancer chemotherapy and organ or bone marrow transplantation). It causes opportunistic oral and genital infections in humans 22, 33. High inhibitory activities against these microorganisms clearly suggest that Sweet basil essential can be used as a natural agent in controlling human pathogens. Several researchers previously reported the antimicrobial activities of basil against various microbes 24-27. Many scientists have linked basil antimicrobial effects to the presence of high content of linalool 23, 28-30. Sweet basil oil exhibited high antimicrobial activities which suggest its use as a potential natural food and medicines preservative.
Total antioxidants content: Total antioxidants content quantified in Sweet basil essential oil using a commercial kit were found to be 50.30 ± 1.5 mM. Sweet basil essential was found to have higher antioxidant content than previously reported values of many cultivars in literature 31, 32. Given the high relative antioxidant activity of Sweet basil, suggest that this plant could constitute new sources of antioxidant phenolics in the daily diet and functional foods.
Antioxidants are commonly found in medicinal plants are potent and safe due to their harmless nature and have been reported to have multiple biological effects. Among medicinal plants, the plants of genus Ocimum are known to very useful for their therapeutic potentials. In traditional medicine, basil has been used as an antiseptic, preservative, sedative, digestive regulator, diuretic, headaches, and coughs, infections of upper respiratory tract, kidney malfunction and to eliminate toxins 34.
CONCLUSIONS: Following conclusions can be withdrawn from the present study:
- Sweet basil was found to produce high biomass yield in less period of time.
- Essential oil extracted from Sweet basil was found to have linalool as a major component.
- The basil essential was found highly active against human pathogens.
- The higher antioxidant concentration in Sweet basil suggests its importance for food and pharmaceutical industries.
ACKNOWLEDGEMENT: The lead author of this report wishes to thank University Grants Commission for financial assistance, authors thankful to the honourable secretary of Board of management of D.B.S. (P.G.) College Kanpur Dr. Nagendra Swarup and Dr. A.K. Srivastava Principal D.B.S. College Kanpur for providing research environment this investigation.
Special regards as well to Dr. R.K. Khare (H.O.D), Dr C.P. Singh for taking time out of his busy schedules, during his sabbatical period to edit this manuscript.
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How to cite this article:
Srivastava HC, Shukla P, Tripathi S and Shanker B: Antioxidant and Antimicrobial activities of Sweet Basil Oils. Int J Pharm Sci Res 2014; 5(1): 279-85.doi: 10.13040/IJPSR. 0975-8232.5(1).279-85
All © 2013 are reserved by International Journal of Pharmaceutical Sciences and Research. This Journal licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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IJPSR
H.C. Srivastava, Pankaj Shukla, Sonia Tripathi* and Bramh Shanker
Department of Chemistry, Research lab, D.B.S. College (R.L.D.B.S.C.), Kanpur- 208006, Uttar Pradesh, India
sonia.tripathi2009@gmail.com
08 April, 2013
08 October, 2013
28 December, 2013
http://dx.doi.org/10.13040/IJPSR.0975-8232.5(1).279-85
01 January, 2014