|Opis:||Synthetic preservatives cause concern to many people because of the reports on their negative impact on the environment and on our health. Even though preservatives are usually used in small concentrations, they are considered as one of the main factors causing allergies to users. Therefore, there is a growing demand for cosmetics that is natural and preservative-free. An alternative way to solve the problem of microbial purity of cosmetics is the use of various plant extracts or essential oils which are not preservatives but also exhibit antimicrobial activity.
The aim of this study was to compare the antimicrobial activity of several herbal extracts and essential oils (cinnamon, tea tree, grapefruit, ginger, turmeric, lemon, lemongrass, olive tree, rosemary, lavender, thyme, sage, and marigold), soaps, and lotions with different compositions and natural preservatives Dermosoft® decalact liquid and LipoFresh™ PG. The antimicrobial activity was determined by the disc diffusion method on fungi A. brasiliensis and C. albicans and on bacteria B. cereus, E. coli, P. aeruginosa, P. fluorescens, and S. aureus.
Essential oils possessed the best antimicrobial activity with the essential oil from lemongrass having the best activity. Most extracts had antimicrobial properties. The best one was a supercritical extract of cinnamon. Soaps had better antimicrobial activity than lotions and Dermosoft® decalact liquid was more effective than LipoFresh™ PG. Growth of bacteria P. aeruginosa was inhibited by the least amount of the samples.|