Posted by admin on Feb 25, 2015 in |
The investigation of terrestrial plants origin aimed at searching new natural biologically active compounds is a central issue of this kind of studies, through structure elucidation combined with biological tests. We investigated the biologically active secondary metabolites from Leucas lavandulaefolia towards various effects on the behavior of Aphanomyces cochlioides zoospores and with antimicrobial activity. We purified the following compounds acacetin, chrysoeriol, luteolin, acacetin 7-O-β-D-glucuronide, acetoside, isoacetoside, salicylic acid and caffeic acid. Their structures were elucidated by spectroscopic analyses and compared with those of the reported data. Five compounds (luteolin, acacetin 7-O-β-D-glucuronide, acetoside, isoacetoside, and salicylic acid) were isolated from L. lavandulaefolia for the first time ever. It was found that luteolin showed a strong attractant and encystment activity toward zoospores of the phytopathogenic fungus A. cochlioides zoospores. Chrysoeriol also showed an attractant activity towards A. cochlioides zoospores. This is the first research report of L. lavandulaefolia regarding zoospores bioassay. Antibacterial assay on these compounds indicated that they have antimicrobial activity against the tested bacteria Bacillus subtilis and Staphylococcus aureus....
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Posted by admin on Dec 1, 2014 in |
An attempt was made to study the anti MRSA and antitubercularactivity of Streptomyces sp. BCA1 isolated from Borra Caves soil. In agar plug method, strain BCA1 showed 12-17 mm inhibition against Gram positive and Gram negative bacteria, including MRSA. Crude pigment produced from strain BCA1 by agar surface fermentation showed 15 – 17 mm inhibition in disc diffusion method against bacterial pathogens. In luciferase reporter phage (LRP) assay the crude pigment showed more than 80% reduction against standard strain M. tuberculosis H37Rv, drug sensitive and multi drug resistant (MDR) clinical isolates of M. tuberculosis. Active pigment was separated by TLC and its activity was confirmed by bioassay guided fractionation. The MIC value of the purified pigment against bacterial pathogens ranged between 6.25 and 50µg/ml. MIC value for M. tuberculosis H37Rv and drug sensitive clinical isolate was found to be 6.25 µg/ ml while that of MDR M. tuberculosis isolate was 25 µg/ ml. The solubility of purified pigment in acid and alkali as well as the appearance of absorption...
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Posted by admin on Dec 1, 2014 in |
The objective of the present study is to develop a rapid HPTLC method for the identification, separation and quantification of some amino acidsfrom two species of Marchantia. Three different mobile phases were used for the separation and estimation of eight amino acids (alanine, glycine, methionine, threonine, valine, leucine, histidine and isoleucine). TheHPTLC analysis of Marchantia palmata and M. nepalensis, showed the presence of all the eight amino acids. The content of all the amino acids in Marchantia nepalensis were higher than M. palmata. Of all the amino acids, the glycine content (0.417 mg/g dw in Marchantia nepalensis and 0.287 mg/g dw in M. palmata) was found to be maximum and valine content (0.053 mg/g dw in Marchantia nepalensis and 0.031 mg/g dw in M. palmata) was found minimum. The presence and content of amino acids in the liverworts has been for the first time evaluated by a modern technique like HPTLC. This method provides an important tool for the quantitative evaluation of important amino acidsandgives more accurate results than...
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Posted by admin on Dec 1, 2014 in |
Ravenala madagascariensis Sonn. is one of the most popular medicinal plants in Madagascar, India and several African countries. It is used in the treatment of many diseases, and particularly in those of diabetes. The duration of treatment, often for life, and its relatively high cost for certain social categories, constrain more and more patients to use this plant. Its chemical constituents were still little studied and this problem could create significant damage in case of intoleranceor abuse during its use.The present study undertaken on the leaves of Ravenala madagascariensis, led to the isolation and structural elucidation of two new compounds (1 and 2), together with the known cycloartanol triterpene (3) which was isolated for the first time from this plant. Their structures were elucidated as (2E, 7R, 11R) phytyl-3, 7, 11, 15-tetramethylhexadec-2-enyl pentadecanoate (1) and (24S, 31S)-cycloartan-31, 32-diol (2). Structural determinations were made on the basis of analysis of 1D and 2D-NMR spectroscopic data. The complete 1H and 13C resonance assignments were also carried out by using 1H-1H COSY,...
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Posted by admin on Sep 1, 2014 in |
Aim: H1 Antihistamines are classified into the first generation and second generation agents. The main differences between the first and second generations of drugs are their propensity to cause central nervous system (CNS) side effects. Therefore, the present study was aimed to analyze the effects of different H1 antihistamines (first and second generation) on CNS using different animal experimental models. Materials and Methods: H1 antihistamines such as pheniramine maleate (3 mg/kg, 6 mg/kg), cetirizine (0.6 mg/kg, 1.2 mg/kg), levocetirizine (0.6 mg/kg, 1.2 mg/kg), loratadine (1 mg/kg, 2 mg/kg) and desloratadine (0.6 mg/kg, 1.2 mg/kg) are evaluated and compared for their effects on CNS using experimental animal model (Pentobarbitone sleeping time, spontaneous motor activity, motor coordination) in Swiss albino mice. Results and Discussion: Desloratadine (0.6 mg/kg, 1.2 mg/kg) and loratadine (1 mg/kg, 2 mg/kg) did not produce significant (P<0.05) effect on sleeping time when compared to control. At 120 min time interval after treatment with cetirizine (1.2 mg/kg) and levocetirizine (1.2 mg/kg) was shown a reduction in locomotor activity and...
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