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Articles by N. Niamsa
Total Records ( 4 ) for N. Niamsa
  N. Niamsa and Y. Baimark
  Highly flexible chitosan films were prepared by film casting of chitosan solutions by using lactic acid solutions as the solvents compare to acetic acid solution. Influences of chitosan molecular weights (100 and 740 kDa), lactic acid concentrations (1.0, 1.5 and 2.0% w/v) and lactic acid configurations (L- and DL-forms) on film characteristics were investigated. Fourier transform infrared (FTIR) spectra of the films showed that there were intermolecular bonds between chitosan film matrices and lactic acids. Tensile strengths at break of the films decreased and percent elongations increased when the lactic acid was used instead of acetic acid for dissolving chitosan. Flexibility of the chitosan films increased with the lactic acid ratio for the both L- and DL-lactic acids. The L-lactic acid showed higher plasticization effect than the DL-lactic acid. Film transparency did not change, whereas wetability of the chitosan films increased as the lactic acid ratio increased.
  C. Sittiwet , N. Niamsa and D. Puangpronpitag
  The A. ebrateutus was extracted in boiling water with 0.7-1.3% yields. The antimicrobial activity of A. ebrateutus aqueous extract has been screened using agar diffusion method. A. ebracteutus aqueous extract showed inhibitory effect on growth of S. aureus ATCC 25923, S. epidermidis ATCC 12228, L. plantarum ATCC 14917, K. pneumoniae ATCC 10031 and P. vulgaris ATCC13315. The MICs and MBCs of A. ebracteutus has been evaluated using agar dilution and broth macro dilution methods. The MICs and MBCs of A. ebracteutus aqueous extract are in the range of 1-2 and 2-4 g L-1, respectively. In conclusion, A. ebracteutus aqueous extract showed good antimicrobial activity against nosocomial pathogen and skin infection bacteria at low concentrations. This might supported the used of A. ebracteutus to treat nosocomial infection and skin infections.
  C. Sittiwet , D. Puangpronpitag and N. Niamsa
  The antimicrobial activity testing to evaluated the possibility of S. leucantha for treatment of nosocomial infection such as respiratory tract and urinary tract infections. The aerial part of S. leucantha was extracted using aqueous system with yield of 0.7-1.3% of dried weight of dried plant ’ s powder. The antibacterial activity of S. leucantha aqueous extract has been screened using agar diffusion method. The S. leucantha aqueous extract showed inhibitory effect on growth of L. plantarum ATCC 14917, E. coli ATCC 25922, K. pneumoniae ATCC 10031 and P. vulgaris ATCC 13315. The MICs of S. leucantha are in the rage of 8-16 g L -1 while MBCs are in the rage of 16-32 g L -1. In conclusion, the aqueous extract of S. leucantha showed inhibitory effect on growth of respiratory tract and urinary tract infection bacteria at low concentration. This result may give supporting data of used S. leucantha as nosocomial infection treatment.
  D. Puangpronpitag , N. Niamsa and C. Sittiwet
  Anti-microbial activity of Eugenia caryophyllum Bullock and Harrison aqueous extract has been tested against food-borne pathogen bacteria (S. aureus ATCC 25923, S. typhimurium ATCC 14028 and E. coli ATCC 25922), normal flora (S. epidermidis ATCC 12228 and L. plantarum ATCC 14917) and other pathogen bacteria (P. vulgaris ATCC 13315). The agar diffusion susceptibility test revealed inhibition zone of Eugenia caryophyllum Bullock and Harrison aqueous extract against S. aureus ATCC 25923, S. typhimurium ATCC 14028, E. coli ATCC 25922, S. epidermidis ATCC 12228, L. plantarum ATCC 14917 and P. vulgaris ATCC 13315. The Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) were determined by using agar dilution and broth macro-dilution methods. The MIC and MBC of clove against all tested bacteria were in the range of 1 to 4 g L-1 and 2 to 8 g L-1, respectively. In conclusion, the aqueous extract of E. caryophyllum showed good inhibitory effect on tested food-borne pathogen bacteria.
 
 
 
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