314042-68-7Relevant academic research and scientific papers
Effect of photodynamic antibacterial chemotherapy combined with antibiotics on Gram-positive and gram-negative bacteria
Ilizirov, Yana,Formanovsky, Andrei,Mikhura, Irina,Paitan, Yossi,Nakonechny, Faina,Nisnevitch, Marina
, (2018/12/11)
The well-known and rapidly growing phenomenon of bacterial resistance to antibiotics is caused by uncontrolled, excessive and inappropriate use of antibiotics. One of alternatives to antibiotics is Photodynamic Antibacterial Chemotherapy (PACT). In the present study, the effect of PACT using a photosensitizer Rose Bengal alone and in combination with antibiotics including methicillin and derivatives of sulfanilamide synthesized by us was tested against antibiotic-sensitive and antibiotic-resistant clinical isolates of Gram-positive S. aureus and Gram-negative P. aeruginosa. Antibiotic-sensitive and resistant strains of P. aeruginosa were eradicated by Rose Bengal under illumination and by sulfanilamide but were not inhibited by new sulfanilamide derivatives. No increase in sensitivity of P. aeruginosa cells to sulfanilamide was observed upon a combination of Rose Bengal and sulfanilamide under illumination. All tested S. aureus strains (MSSA and MRSA) were effectively inhibited by PACT. When treated with sub-MIC concentrations of Rose Bengal under illumination, the minimum inhibitory concentrations (MIC) of methicillin decreased significantly for MSSA and MRSA strains. In some cases, antibiotic sensitivity of resistant strains can be restored by combining antibiotics with PACT.
A convenient synthesis of p-substituted 1-arylsulfonyl-pyrrolidin-2-ones
Zareef, Muhammad,Iqbal, Rashid,Khan, Khalid M.,Zaidi, Javid H.,Zia-Ullah,Arfan, Muhammad
scheme or table, p. 485 - 488 (2010/06/19)
A convenient and novel method of cyclisation of 4-(4-substituted- phenylsulfonamido)-butanoic acids to their corresponding p-substituted 1-arylsulfonyl-pyrrolidin-2-ones was achieved by using polyphosphate ester (PPE). The reaction times were considerably
Hapten synthesis and development of polyclonal antibody-based multi-sulfonamide immunoassays
Zhang, Hongyan,Duan, Zhenjuan,Wang, Lei,Zhang, Yan,Wang, Shuo
, p. 4499 - 4505 (2007/10/03)
This paper reports the synthesis of five sulfonamide derivatives, the production of broad-specificity polyclonal antibodies for immunoassay of sulfonamides, and the analysis of milk samples by developed assay. The three-step synthesis procedure reported in most of the literature was adopted and modified in this study. In the procedure, the purification of the intermediate was avoided and the time of synthesis was shortened from >20 to 6-9 h with improved yields. This method is generally applicable to the synthesis of haptens containing the common structure of sulfonamides. Three haptens were coupled to keyhole limpet hemocyanin, and polyclonal antibodies were obtained from rabbits immunized with these conjugates. Using the antibodies obtained, from one of these was developed an enzyme-linked immunosorbent assay (ELISA) based on the competition between free sulfonamides and the hapten-horseradish peroxidase (HRP) conjugates. The hapten-HRP conjugate giving the best competitive results and 11 structurally different sulfonamides showed 50% inhibition at concentrations of -1. After removal of the protein with acetone, milk samples were analyzed by ELISA directly; a matrix effect could be avoided when a 1:20 dilution with phosphate-buffered saline was used, and 104-131% recoveries of spiked samples were obtained. The developed immunoassay is suitable to determine sulfisozole, sulfathiazole, sulfameter, sulfamethoxypyridazine, sulfapyridine, and sulfamethizole below the maximum residue limit in milk (100 ng mL-1 of total sulfonamides) rapidly and reliably.
