Antimicrobial Effect of Rosemary Extracts

Abstract

A rosemary extract commercially exploited (Oxy'less) as an antioxidant of lipids in foods was dissolved in ethanol (100 mg/ml), and the solution was tested against foodborne microorganisms. For gram-positive bacteria, the MIC of the ethanolic solution was 1% for Leuconostoc mesenteroides, 0.5% for Listeria monocytogenes, 0.5% for Staphylococcus aureus, 0.13% for Streptococcus mutans, and 0.06% for Bacillus cereus. It slowed the growth of Penicillium roquefortii and Botrytis cinerea. Up to 1% of the ethanolic solution had no activity on the gram-negative bacteria Escherichia coli, Salmonella Enteritidis, and Erwinia carotovora and on the yeasts Rhodotorula glutinis and Cryptococcus laurentii. Antibacterial activity of the rosemary extract was strongly influenced by the composition of the media. The MIC was reduced by low pH, high NaCl contents, and low temperatures. Low pH and high NaCl concentration had a synergistic effect on the MIC of the rosemary extract for S. aureus. Lipids, surface-active agents, and some proteins decreased its antibacterial activity, whereas pectin had no effect. The inhibitory effect was little modified by heat treatment (100 degrees C). The natural microflora of pasteurized zucchini broth was inhibited by 0.5% of the rosemary extract. The antibacterial activity was linked to the compounds extracted with hexane, which are presumably phenolic diterpenoids.

Antibacterial activity of aqueous extract of pomegranate peel against Pseudomonas stutzeri isolated from poultry meat

“…Previously studied natural antimicrobials in meat products include bacteriocins, lactoferrin, lysozyme, spices, essential oils and variety plant extracts. Antibacterial activity of rosemary extract (Del Campo et al 2000), garlic extract (Tsao and Yin 2001), grape fruits extract in fish (Cho et al 1990), capsicum extract in raw beef (Monica et al 2003), oregano essential oils in sheep meat (Govaris et al 2010) have been reported. The antimicrobial activity of many plant extracts, traditional spices and essential oils is well documented (Ahmad and Beg 2001;Naz et al 2007;Shan et al 2007;Burt 2004).…”

Antioxidant and Free Radical Scavenging Activity of Essential Oil Extracted From Rosmarinus Officinalis L.

“…Its essential oil is used therapeutically and balneologically. Rosemary contains a large number of compounds responsible for its antioxidant, anti-inflammatory, anti-mutagenic, anti-carcinogenic, chemo-preventive, antimicrobial, and anti-viral activities [4][5][6][7][8][9][10] . Also, an induction of NGF (nerve growth factor) in human glioblastoma cells using rosemary extract has been described 11 …”

In Vitro and In Vivo Effects of Aqueous Extract of Rosmarinus officinalis L. (Rosemary) in The Control of Late Blight Disease of Potato Caused by Phytophthora Infestans Mont. De Bary. in Algeria

“…Besides, some reported that a number of compounds contained in the extracts of R. officinalis revealed antibacterial and antifungal properties [20,21].…”