Posted by admin on Sep 1, 2011 in |
Aqueous and methanol extracts of fruit bodies of Daldinia concentrica were tested against five pathogenic fungi like Penicillium sps., Aspergillus fumigatous, Aspergillus niger, Aspergillus flavus and Mucour indicus and also five bacterial strains such as Escherichia coli, Pseudomonas aeruginosa, Salmonella typhi, Staphylococcus aureus and Streptococcus mutans . The antibacterial and antifungal activities of the above extracts were determined by well diffusion assay. Nearly both the extracts were found effective against these bacteria and fungi. The aqueous extract showed higher zone of inhibition than the methanol extract tested. The extracts exhibited antibacterial activities with zone of inhibition ranging from 14 – 54 mm and 5 – 23 mm for aqueous and methanol extracts whereas, antifungal activities zone of inhibition ranging from 9 – 25 mm and 7 – 18 mm, for aqueous and methanol extracts, respectively. The organisms were more sensitive to the aqueous extract of the fungal fruit bodies than that of methanol...
Read More
Posted by admin on Sep 1, 2011 in |
A series of nine 1-(4-aryl-2-thiazolyl)-3, 5- diaryl and six of 1- (4- aryl- 2-oxazolyl)-3, 5- diaryl- 2- pyrazolin derivatives were prepared by reacting 3, 5-diaryl-1- thiocarbamoyl-/or 3, 5- diaryl- 1- carbamoyl- D2– pyrazolines with substituted phenacyl bromide in ethanol. The structures of the synthesized derivatives were confirmed by IR, 1H-NMR, 13C-NMR as well as EIMS spectral data. Some of these derivatives were screened for their antimicrobial activity against Gram-positive, Gram- negative and pathogenic fungi, and showed a significant activity....
Read More
Posted by admin on Sep 1, 2011 in |
Medicinal plant products when compared with synthetic antibiotics minimize the infections at a major part. Phytochemical screening of medicinal plants showed positive results for most of the phytochemical constituents namely tannins, saponins, flavonoids, carbohydrates, alkaloids, anthraquinones, protein and aminoacids, mixed oils and fats etc., This study provided a good medicinal plant based treatment strategy and will create social awareness among the clinically infected patients. Five important bacterial spp., identified from them namely P. aeruginosa, K. pneumoniae, E. coli, S. aureus and B. subtilis. Antibacterial activity of the plant extracts showed different inhibition spectrum against the isolated bacterial pathogens. Among them leaf methanolic extract of Azadirachta indica showed good antibacterial...
Read More
Posted by admin on Sep 1, 2011 in |
Two plants, Spilanthes acmella and Boenninghausenia albiflora used against the insect Pediculus humanus by the Gaddi tribals of Himachal Pradesh were presently tested for their insecticidal activity. The methanolic extracts of these plants were prepared from different parts of the plant collected in different months of the year since the active principle is known to vary in different parts of the plant and also with change in climate. Best results were obtained in the extracts made from the plants collected in the month of November. The flowers of S. acmella and the stem of B. albiflora gave the best results when crude extracts of different parts of the plant were used against the insect. When purified extracts of different concentrations made from these parts were tested against the target insect, 80% mortality was obtained with 800 ppm of S. acmella extract made from flowers and 90% mortality was obtained with 800 ppm of B. albiflora extract made from stem after an exposure of 24 hrs. The mortality remained constant...
Read More
Posted by admin on Sep 1, 2011 in |
Preservatives are added to pharmaceuticals to ensure safety and shelf life. A number of Essential oil components are identified as effective antimicrobials. The antimicrobial activity is assessed of pure oils. Oils were evaluated based on Refractive index, Specific gravity and Antimicrobial activity. In present study Syrups were prepared using Peppermint, Rose and Orange oils in different concentrations and antimicrobial activity was determined by using same syrups and compared with antimicrobial activity of pure oils determined by using same concentrations as used in syrups at the end of 7, 14 and 28 days. It was found that pure oils showed higher activity than syrups and only peppermint oil used in concentration of 2% showed antimicrobial activity after 28 days against S. aureus. Syrups containing Rose oil showed activity against E. coli in concentrations of 1% and 2%, against S. aureus only 2% syrup showed activity. All oils were found to be more active against Gram +ve microorganisms than Gram –ve...
Read More
