In vitro studies of the antibacterial activity of Copaifera spp. oleoresins, sodium hypochlorite, and peracetic acid against clinical and environmental isolates recovered from a hemodialysis unit

Author(s)

Leite Vieira, Rosimara Goncalves ^[1] ; Moraes, Thais da Silva ^[1] ; Silva, Larissa de Oliveira ^[1] ; Bianchi, Thamires Chiquini ^[1] ; Sola Veneziani, Rodrigo Cassio ^[1] ; Ambrosio, Sergio Ricardo ^[1] ; Bastos, Jairo Kenupp ^[2] ; Pires, Regina Helena ^[1] ; Gomes Martins, Carlos Henrique ^[1]

Affiliation

^[1] Univ Franca, Lab Res Appl Microbiol, Nucleus Res Sci & Technol, Ave Armando Salles de Oliveira 201, BR-14404600 Franca, SP - Brazil

^[2] Univ Sao Paulo, Sch Pharmaceut Sci Ribeirao Preto, Ave Cafe S-N, BR-14040903 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: ANTIMICROBIAL RESISTANCE AND INFECTION CONTROL; v. 7, JAN 24 2018.
• Web of Science Citations: 3

Abstract

Background: Patients submitted to hemodialysis therapy are more susceptible to infection, especially to infection by Gram-positive bacteria. Various research works have attempted to discover new antimicrobial agents from plant extracts and other natural products. Methods: The present study aimed to assess the antibacterial activities of Copaifera duckei, C. reticulata, and C. oblongifolia oleoresins; sodium hypochlorite; and peracetic acid against clinical and environmental isolates recovered from a Hemodialysis Unit. The Minimum Inhibitory Concentration and the Fractionated Inhibitory Concentration Index were determined; the ability of the tested compounds/extracts to inhibit biofilm formation was evaluated by calculating the MICB50 and IC50. Results: C. duckei was the most efficient among the assayed Copaifera species, and its oleoresin was more effective than peracetic acid and sodium hypochlorite. Copaifera oleoresins and disinfectants did not act synergistically at any of the tested combinations. Certain of C. duckei oleoresin, peracetic acid, and sodium hypochlorite concentrations inhibited biofilm formation and eradicated 50% of the biofilm population. Conclusion: C. duckei oleoresin is a potential candidate for disinfectant formulations. Based on these results and given the high incidence of multi-resistant bacteria in hemodialysis patients, it is imperative that new potential antibacterial agents like C. duckei oleoresin, which is active against Staphylococcus, be included in disinfectant formulations. (AU)

• FAPESP's process: 11/13630-7 - Chemical and pharmacological validation of extracts and active compounds of Copaifera species
• Grantee: Jairo Kenupp Bastos
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 12/25237-0 - Kaurane-type diterpenes: activity against anaerobic bacteria and proteomics
• Grantee: Carlos Henrique Gomes Martins
• Support Opportunities: Regular Research Grants