The company’s olive leaf extract has traditionally been used as a herbal dietary supplement as it contains oleuropein and other polyphenolic compounds that offer benefits in terms of blood pressure, heart health and immune systems.
It said that secondary plant substances such as olive leaf extract were gaining increasing attention as potential antibacterial and food preservative agents.
In the current study, Dr Yanhong Liu found that olive leaf extract inhibited the growth of Listeria monocytogenes completely.
In a previously published study, Dr Yanhong Liu and others investigated the antimicrobial effect of olive leaf extract against major foodborne pathogens, including Listeria monocytogenes, Escherichia coli and Salmonella enteritidis.
The results demonstrated that, at a concentration of 62.5 mg/ml, olive leaf extract almost completely inhibited the growth of these three pathogens.
In addition, it inhibited biofilm formation in Listeria monocytogenes and Salmonella enteritidis, and reduced cell motility in Listeria monocytogenes.