Antibacterial activity of the leaves of Liquidambar formosana
Author: Chung, Wang Xiaoli MA Lian-lan
【Abstract】 Objective To investigate the in vitro
antibacterial activity of the leaves of Liquidambar formosana.
Methods agar diffusion method and in vitro leaves of Liquidambar successive dilution method and conditions for common pathogenic bacteria in vitro antibacterial activity and minimum inhibitory concentration (MIC). Results Liquidambar leaves against Escherichia coli, Candida albicans no
antibacterial effect; sweet gum leaves against Staphylococcus aureus, Staphylococcus albus, Shigella flexneri, Salmonella typhi, Pseudomonas aeruginosa are have an antibacterial effect, inhibition zone diameter between 13 ~ 25 mm. Different
methods of extraction liquid antibacterial effect of a significant difference, in which sweet gum leaves, decoction the best antibacterial activity against Staphylococcus aureus, Staphylococcus albus, Shigella flexneri, Salmonella typhi,
Pseudomonas aeruginosa The minimum inhibitory concentration of bacteria were 0.5,1,0.5,0.5,0.25 g / ml. Conclusion Liquidambar leaves against Staphylococcus aureus, Staphylococcus albus, Shigella flexneri, Salmonella typhi, Pseudomonas aeruginosa has good antibacterial effect.
Key words Liquidambar leaves; antibacterial activity; minimum inhibitory concentration
Abstract: ObjectiveTo research antimicrobial activity of Liquidambar formosana Hance's leaf.MethodsBy methods of agar plate diffusions and tube continuous dilution, to measure antimicrobial activity and minimal inhibitory concentration (MIC) of Liquidambar formosana Hance's leaf against pathogen and conditioned pathogen.Results (1) Liquidambar formosana Hance's leaf had not antimicrobial activity on E.coli,
S.albicans. (2) Liquidambar formosana Hance's leaf had antimicrobial activity against S.aureus, S.epidermidis, S.flexneri, Salmonella Typhi, P.aeruginosa, the diameter of bacteriostatic circle was between 13 and 25 millimetre. The
antimicrobial activity was significant different in different extracted drug liquid, among which the antimicrobial activity of water extraction of Liquidambar formosana Hance's leaf was the best, the minimal inhibitory concentration against S.aureus S.epidermidis, S . flexneri, Salmonella Typhi, P.aeruginosa, is 0.5,1,0.5,0.5,0.25 g / ml,
respectively.ConclusionLiquidambar formosana Hance's leaf has good antimicrobial activity against S.aureus, S.epidermidis, S.flexneri, Salmonella Typhi and P.aeruginosa.
Key words: Liquidambar formosana Hance's leaf; Antimicrobial activity; Minimal inhibitory concentration
With the extensive use of antibiotics, resistant strains have increased every year, at present Staphylococcus aureus strains resistant to penicillin G, as high as 90% , in particular, methicillin-resistant Staphylococcus aureus
(methicillin-resistant Staphylococcus aureus, MRSA) has become the most common nosocomial infection pathogen . Some might even have a multi-drug resistant bacteria such as E. coli
pathogenic strains of about 40% of streptomycin, chloramphenicol, tetracycline, penicillin and other antibiotics resistance ; Pseudomonas aeruginosa Many antibiotics have a natural or acquired drug resistance , this has caused great difficulty in clinical treatment, how to effectively combat bacterial infections and control of bacterial drug resistance and the spread is a long, complex and arduous task, and thus to find and the development of
effective antibiotics is essential. In this paper, agar
diffusion and serial dilution method in vitro antibacterial test and the minimum inhibitory concentration (MIC) determination to explore the sweet gum tree leaves and conditions for common pathogenic bacteria in vitro antibacterial activity. Are reported below.
1 Materials and Methods Tu
1.1 The source of Staphylococcus aureus strains (ATCC25923), Staphylococcus albus (ATCC12228), Escherichia coli (ATCC25922), Shigella flexneri (ATCC27891), Salmonella typhi (ATCC14028), Pseudomonas aeruginosa (ATCC27853) , purchased by the identification of biological products in Beijing. Candida albicans (ATCC14053), Peking University First Hospital Fungal Culture Collection Center (Beijing) to provide.
1.2 Liquidambar leaves were collected from Jiangxi,
Nanshan District, herbs time between 5 June.
1.3 Preparation of liquid
1.3.1 50% ethanol to take sweet gum leaves, decoction (crude drug) 40 g, washed, plus amount of 50% ethanol solution soaked 30 min, heated to 100 ? 30 min, filter. Dregs together
with moderate 50% alcohol solution, heating 100 ? 30 min,
filter. The two filtrate combined with the slow fire concentrated to 10 ml (per ml of liquid containing 4 g crude drug).
1.3.2 decoction with distilled water instead of 50%
ethanol solution were prepared according to the above-
1.3.3 50% ethanol extract obtained sweet gum leaves (crude drug) 40 g, washed crushed, and soaked in distilled
water and 10 ml mixing 2h, filtered, and then through the
filter bacteria filtration sterilization device, made of 4 g / ml of crude drug.
1.3.4 water extract with distilled water instead of 50% ethanol solution were prepared according to the above-
1.4.1 Preparation of the Bacterium Staphylococcus aureus, Staphylococcus albus, Escherichia coli, Shigella flexneri, Salmonella typhi, Pseudomonas aeruginosa inoculated in ordinary agar plate, temperature box at 37 ? cultured 18 h,
paired with sterile saline equivalent to 300 million per milliliter concentrations of bacteria (Staphylococcus aureus and Staphylococcus albus dubbed the equivalent of 900 million per milliliter of the bacteria concentration). To Candida albicans were inoculated on Sabouraud agar plate, warm box at
37 ? cultured 48 h, paired with sterile saline 1 ×
1.4.2 agar diffusion method using sterile cotton swab picks up bacilli in the ordinary agar plate (Candida albicans agar plate with the Sarbanes-Oxley) for uniform-intensive
crossed until the bacilli dry, with external diameter 5 mm of play hole punch device, each conga liquid 200 μl, flat on the
tank temperature 37 ? cultured 24 h (Candida albicans
cultured 48 h) observations, measuring inhibition zone diameters. Inhibition zone diameter, taking the average of the two experimental results. Reposted elsewhere in the paper for free download http://
1.4.3 test-tube serial dilution method  According to the inhibitory results of the experiment, select the
susceptible ones sweet gum leaves, decoction of its determination of the minimum inhibitory concentration. Take trumpet tube 7, number. Step 1 of each tube add 1 ml broth. And then the first one plus 1 ml liquid, with the straw in a
blowing smoke several times, so that liquid mixing with the
broth, remove 1 ml added in section 2, mixing all out in paragraph 1 ml plus 3, and so diluted to 6 disposable to 1 ml, No. 7 without any liquid used as control. Step 3 bacilli per tube plus 50 μl, mixing, temperature box at 37 ? cultured 24
h. And then removed from each tube was inoculated into a normal part inoculated agar plate, and then further incubated 24 h, observe the results. No bacterial growth in order to