3.1. Antibacterial efficiency testing
The MICs for the V20 and V40 rosemary extracts were determined
using the broth microdilution method, on the basis of the
concentration where no metabolic activity was observed, as
described by Klancnik et al. (2010). The results showed that both of
these rosemary extracts that contained carnosic acid as the main
antimicrobially active phenolic compound were effective against
A. acidoterrestris, A. hesperidum and A. cycloheptanicus, with MICs of
7.8 mg/ml for V20, and 3.9 mg/ml for V40.