total flavonoids contents and anti bacterial activity of the extracts of two labiateae species: nepeta menthoides and thymus trautvetteri

total flavonoids contents and antibacterial activity of the extracts from the aerial parts of two labiateae species, nepeta menthoides boiss. & buhse and thymus trautvetteri klokov & desj.-shost. were determined. quantitative determination of flavonoid contents was calculated in terms of quercetin equivalent in various extracts (50% methanol, chloroform and distilled water) by alcl3 colorimetric method. it was found that total flavonoids contents of n. menthoides extracts in different solvents were (2.308%, 0.884% and 0.710%) mg/g and (2.076%, 1.468% and 1.412%) mg/g for t. trautvetteri  respectively.antibacterial activity of the extracts was also determined against 6 gr (+/-) bacteria by disc diffusion method. the results showed that 50% methanol extracts of two species displayed better inhibitor activity against the tested bacteria. the bacteria stapylococcus epidermidis, staphylococcus saprophyticus and staphylococcus aureus  were sensitive against 50% methanol extract of n. menthoides even more than the standard antibiotics (10μg). therefore a good correlation between total flavonoids contents and antibacterial activity of the studied extracts is demonstrated.