Antimicrobial Activity of Methanolic Extracts Of Bamboo Shoots (Bambusa vulgaris)

Antimicrobial Activity of Methanolic Extracts Of Bamboo Shoots (Bambusa vulgaris)

INTRODUCTION

Herbal medicine represents one of the most important fields of traditional medicine all over the world. To promote the proper use of herbal medicine and to determine their potential as sources for new drugs, it is essential to study medicinal plants, which have folklore reputation in a more intensified way [1]. Contrary to the synthetic drugs, antimicrobials of plant origin are not associated with side effects and have an enormous therapeutic potential to heal many infectious diseases. For example, vincristine (an antitumor drug), digitalis (a heart regulator) and ephedrine (a bronchodilator used to decrease respiratory congestion) were all originally discovered through research on plants. The potential for developing antimicrobials from higher plants appears rewarding as it will lead to the development of a phytomedicine to act against microbes. Plant-based antimicrobials have enormous therapeutic potential as they can serve the purpose with lesser side effects that are often associated with synthetic antimicrobials [2]. Thousands of secondary plant products have been identified and it is estimated that thousands of these compounds still exist. Since secondary metabolites from natural resources have been elaborated within living systems, they are often perceived as showing more "drug likeness and biological friendliness than totally synthetic molecules" making them good candidates for further drug development [3-5].

Bamboo is a member of the grass family, which is generally used for medicinal purposes as to maintain optimum health weight or to treat liver disorders. Bamboo shoots help in lowering high blood pressure as they are rich in potassium. Bamboo shoots are packed with phenolic acids, with anti-oxidant and anti-inflammatory properties. One of the important fact about bamboo shoots nutrition is that the phyto-chemicals present in bamboo shoots are potent antioxidants which are considered as magical, due to their anti-cancer, anti-bacterial and anti-fungal properties. Bamboo shoots can be ideally consumed for healthy weight loss as they are low in calories.

MATERIALS AND METHODS

Plant Materials

Plant materials were collected at the local area of M.P. Plant authentified from K.N.K. College of horticulture by Dr. Gyanendra Tiwari and Mandsaur. The voucher specimen (MIP/C/ VSNTS-18) was submitted in Department of Pharmacognosy at Mandsaur Institute of Pharmacy, Mandsaur.

Preparation of extract

Fresh Shoots were collected and dried in shade. Dried shoots were powdered then it was subjected for extraction with methanol. The extract were collected, filtered and concentrated by heating with electronic waterbath.

Test Microorganisms

In the study Streptococcus pneumoniae, Escherichia coli, Proteus vulgaris, S. epidermisand Staphylococcus aureus were used.

SCREENING OF ANTIMICROBIAL ACTIVITY

Preparation of Media[6]

The definite volumes of peptone (1%), Beef extract (1%), Agar (3%) and Sodium chloride (0.5%) were dissolved in distilled water and pH was adjusted to 7.2. This solution was sterilized by autoclaving at 15 p.s.i. for 20 min.

Preparation of sub-culture

One day prior to this testing, inoculation of the above bacteria cultures were made in the nutrient agar and incubated at 37C for 18-24 hr.

Preparation of test solutions

Test compound (5.0 mg) was dissolved in dimethylsulphoxide (5.0 ml) to give a 1,000 mg/ml this solution was used for testing.

Antimicrobial activity testing method

Filter paper discs of 7 mm diameter were prepared and sterilised. Using an ethanol dipped and flamed forceps, these discs were aseptically placed over nutrient agar plates seeded with the respective test microorganisms. One hundred microlitres of the Bamboo extract were aseptically transfered to these discs.

Incubation

The plates were incubated in an upright position at 37C for 24 hours. The diameter of inhibition zones (in mm) & % inhibition of Zone were measured and the results were recorded [2].

RESULTS AND DISCUSSION

Different strain of gram negative bacteria and positive bacteria isolated from urine specimens, viz., Escherichia coli (433), Streptococcus pneumoniae were used in the present study. The results of in vitro antimicrobial activity of bambusa vulgaris are presented in Table 1. The diameter of inhibitory zones recorded includes the size of filter paper discs (6mm in diameter).

The in vitro anti microbial activity of Methanolic extracts of bambusa vulgaris on gram-positive and gram-negative bacteria collected from local market, Mandsaur were studied. This result are shown in Table 1 the maximum activity was on B. subtilis(16-17 mm) and minimum activity was on S. aureus(11-12mm), among the gram positive bacteria. The inhibition zone, especially on Ofloxacin resistant was 26-27mm respectively.

On the other hand the maximum activity was observed on E. coli (14mm) among the gram negative bacteria. The anti bacterial activity of the plant on antibiotic resistant strains was especially notable.

The yield of methanolic extracts obtained from air dried plant material was 1gm, these extract showed strong antimicrobial activity on Staphylococcus epidermidis. and Staphylococcus aureus. It is important that the methanolic extracts of bambusa vulgaris have antimicrobial activity on E-coli ,which are multiple antibiotic bacteria, because E-coli is a biogenic amine procedure in food[7].Also E- coli has become an important agent of nosocomial infection[8].

The methanolic extracts also inhibited the growth of multiple antibiotic resistant Staphylococcus stain, tested. The effect of methanolic extracts on S. aureus and S.epidermidis were high. S. aureus is a one of the most common causes of both hospital and community-acquired infection worldwide [9]. S. aureus is a major cause of cutaneous infections, furunculosis, impetigo and arthritis, and toxinoses, such as food poisoning, septic shock, scalded skin syndrome and toxic shock syndrome [10].The presence of antibiotic resistant staphylococci is of concern due to the possible spread of resistance determinants among the staphylococcus species. This could lead to the survival, growth and spread of enterotoxigenic staphylococci and staphylococci of clinical significance.[11].

The inhibition zone of the methanolic extracts of these materials collected from different location, on bacteria, were similar [Table-1]. The study demonstrates that bambusa vulgaris had antimicrobial activity on Gram-positive and Gram-negative bacteria.

Table 1 Antimicrobial Activity of compounds

S.No. Microorganisms Zone Of inhibition (mm) Activity index % activity

1. S.P. 12 0.46 46%

2. S.A. 11 0.42 42%

3. S.E. 16 0.61 61%

4. E.c. 14 0.53 53%

5. P.V. (-) (-) (-)

Where S.P:Streptococcus pneumoniae, E.c:Escherichia coli, P.V.: Proteus vulgaris, S.E:Staphylococcus epidermis, S.A: Staphylococcus aureus

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