This study aimed to evaluate the antimicrobial effects, the radical scavengingactivity (by DPPH and ABTS tests) and the antioxidant capacity (by -carotenebleaching test) of Betula aetnensis leaves extract. The antimicrobial activitywas tested against 14 Gram-positive clinical strains, 2 ATCC Gram-positivestrains, 10 Gram-negative clinical strains and 4 Gram-negative ATCC strains.Streptococcus pyogenes Ery-S and Ery-R1 were the most sensitive. Betulaaetnensis was considerably active against three bacterial strains, namelyHaemophilus influenzae ATCC 49247, Amp-R1 and Moraxella catarrhalisATCC 25238. Standard ATCC strains of Gram-positive bacteria were moresensitive than Gram-negative. Betula aetnensis showed also an interestingreducing power with TEAC values of 9.7 and a good inhibition of linoleic acidoxidation with an IC50 value of 22.0 microg/mL after 30 min of incubation. The totalphenol and flavonoid contents were determined with the purpose to evaluate therelationship with the observed bioactivities.
Antimicrobial and antioxidant properties of Betula aetnensis Rafin. (Betulaceae) leaves extract
Tundis R;Loizzo MR;
2013-01-01
Abstract
This study aimed to evaluate the antimicrobial effects, the radical scavengingactivity (by DPPH and ABTS tests) and the antioxidant capacity (by -carotenebleaching test) of Betula aetnensis leaves extract. The antimicrobial activitywas tested against 14 Gram-positive clinical strains, 2 ATCC Gram-positivestrains, 10 Gram-negative clinical strains and 4 Gram-negative ATCC strains.Streptococcus pyogenes Ery-S and Ery-R1 were the most sensitive. Betulaaetnensis was considerably active against three bacterial strains, namelyHaemophilus influenzae ATCC 49247, Amp-R1 and Moraxella catarrhalisATCC 25238. Standard ATCC strains of Gram-positive bacteria were moresensitive than Gram-negative. Betula aetnensis showed also an interestingreducing power with TEAC values of 9.7 and a good inhibition of linoleic acidoxidation with an IC50 value of 22.0 microg/mL after 30 min of incubation. The totalphenol and flavonoid contents were determined with the purpose to evaluate therelationship with the observed bioactivities.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
