title: Antimicrobial activity of newly synthesized methylsulfanyl-triazoloquinazoline derivatives.
abstract: OBJECTIVE
  The aim of this research was to study and evaluate the antimicrobial activity of a novel 2-methylsulfanyl-[1,2,4]triazolo[1,5-a]quinazoline and its derivatives. Antibacterial activity of the target compounds was tested against a variety of species of Gram-positive bacteria such as Staphylococcus aureus ATCC 29213, Bacillus subtilis ATCC6633, and Gram-negative bacteria such as Pseudomonas aeruginosa ATCC27953 and Escherichia coli ATCC 25922. In addition some yeast and fungi, Candida albicans NRRL Y-477 and Aspergillus niger, respectively, were screened.
  
  
  METHODS
  Antimicrobial tests were carried out by the agar well diffusion method, using 100 μl of suspension containing 1 × 10(8)  CFU/ml of pathological tested bacteria, 1 × 10(6)  CFU/ml of yeast, and 1 × 10(4)  spore/ml of fungi spread on nutrient agar (NA), Sabourand dextrose agar (SDA), and potato dextrose agar (PDA), respectively.
  
  
  RESULTS
  The minimum inhibitory concentration (MIC) of the tested compounds was determined using the broth double dilution method (serially diluted technique) in proper nutrient. For comparison, ciprofloxacin and ketoconazole were used as antibacterial and antifungal reference drugs, respectively. Compounds 6, 9, 13, 14, and 11 were found to have the highest broad-spectrum antibacterial activity against S. aureus ATCC 29213, B. subtilis ATCC6633 and Gram-negative bacteria such as P. aeruginosa ATCC27953 and E. coli ATCC 25922 with MIC values of 6.25 and 12.50 μg/ml.
  
  
  CONCLUSIONS
  It was clear that many of the synthesized compounds exhibited good antimicrobial activity. This study has revealed that compounds 6, 9, 13, 14, and 11 have been disclosed as moderate antimicrobial agents. These compounds could be useful as templates for further development through modification or derivatization to design more potent antimicrobial agents.
authors: Department of Pharmaceutical Chemistry, King Saud University, Riyadh, Saudi Arabia. salahi76@yahoo.com
authors: Rashad
authors: R
authors: Al-Salahi
authors: Mohamed
authors: M
authors: Marzouk
authors: Ghada
authors: G
authors: Awad
authors: Mohamed
authors: M
authors: Al-Omar
authors: Essam
authors: E
authors: Ezzeldin
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D000935:Antifungal Agents / Q000737:chemistry / Q000494:pharmacology*; D005658:Fungi / Q000187:drug effects; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D008698:Mesylates / Q000737:chemistry / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D011799:Quinazolines / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D008698:Mesylates; D011799:Quinazolines; C045880:methanesulfonic acid