NORDSCI Conference proceedings 2018, Book 1

Sociology and Healthcare

COMPARATIVE STUDY REGARDING ANTIBACTERIAL ACTION OF THE USNEA BARBATA L. EXTRACTS ON GRAM-POSITIVE AND GRAM-NEGATIVE BACTERIA FROM THE ORO-DENTAL CAVITY

PhD Student Violeta Popovici, Assoc. Prof. Dr. Laura Bucur, Assoc. Prof. Dr. Antoanela Popescu, Prof. Dr. Aureliana Caraiane, Prof. Dr. Victoria Badea

ABSTRACT

This study is based on the hypothesis that various extracts from Usnea barbata L. have antibacterial action. Six lichen extracts of different concentrations in: 96% ethanol, acetone and water, have been studied. Their inhibitory action was tested by adapting a diffusimetric antibiogram, made for three pathogenic Gram-positive and Gram-negative bacteria from the oro-dental cavity: Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli.
Our results showed that on Staphylococcus aureus, acetone and ethanolic Usnea barbata L. extracts have a great antibacterial action. On Gram-negative bacteria, in the zone of inhibition of the acetone and ethanolic extracts from Usnea barbata L., the development of resistant mutant strains was observed. On all the studied pathogenic bacteria: aqueous extract from Usnea barbata L. is totally inactive.
In conclusion, in oro-dental infections where strains of Staphylococcus are involved, acetone and ethanolic Usnea barbata L. extracts could be very effective as auxiliary treatment, together with classic antibiotics.

KEYWORDS

Usnea barbata L. extracts, antibacterial action, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli

REFERENCE

NORDSCI Conference Proceedings 2018 Book 1, Conference Proceedings, ISSN 2603-4107, ISBN 978-619-7495-00-3, COMPARATIVE STUDY REGARDING ANTIBACTERIAL ACTION OF THE USNEA BARBATA L. EXTRACTS ON GRAM-POSITIVE AND GRAM-NEGATIVE BACTERIA FROM THE ORO-DENTAL CAVITY, 427-434 pp, DOI paper 10.32008/nordsci2018/B1/V1/50