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Zadra M, Menezes BBD, Frescura LM, Essi L, Amaro de Carvalho C, Barcellos da Rosa M. Ruellia angustiflora (Nees) Lindau ex Rambo: extraction and characterization of phenolic compounds and evaluation of antiradical, photoprotective and antimicrobial activities. Nat Prod Res 2024; 38:2082-2090. [PMID: 37548309 DOI: 10.1080/14786419.2023.2244124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 07/03/2023] [Accepted: 07/24/2023] [Indexed: 08/08/2023]
Abstract
Ruellia angustiflora is a shrub popularly known as flower of fire, used in traditional medicine as a healing agent. This study aims to verify the presence of characteristics of pharmaceutical interest in extracts from the root, stem and leaves of this species. The ideal time for ultrasound-assisted extraction is 60 min with a solid-liquid ratio of 1% (w/v). The kinetics of the reaction of the extracts with DPPH is biphasic, and IC50 values are related to the total phenolic compounds. Five phenolic compounds were identified in the extracts, where ferulic acid, rutin and quercetin showed to be the main responsible for the antiradical activity. The extracts displayed considerable photoprotective activity, mainly Ra-LE (SPF = 23). Ra-RE showed an inhibition halo similar to erythromycin against Streptococcus pyogenes. Taken together, these data reveal that Ruellia angustiflora is a source of phenolic compounds and has relevant antiradical, photoprotective and antibacterial activities.
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Affiliation(s)
- Marina Zadra
- Post-Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria, Santa Maria, Brazil
| | | | - Lucas Mironuk Frescura
- Post-Graduate Program in Chemistry, Federal University of Santa Maria, Santa Maria, Brazil
| | - Liliana Essi
- Department of Biology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | | | - Marcelo Barcellos da Rosa
- Post-Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria, Santa Maria, Brazil
- Post-Graduate Program in Chemistry, Federal University of Santa Maria, Santa Maria, Brazil
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Mathematical model and stability analysis on the transmission dynamics of skin sores. Epidemiol Infect 2022; 150:e207. [PMID: 36397272 PMCID: PMC9987028 DOI: 10.1017/s0950268822001807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In this study, a non-linear deterministic model for the transmission dynamics of skin sores (impetigo) disease is developed and analysed by the help of stability of differential equations. Some basic properties of the model including existence and positivity as well as boundedness of the solutions of the model are investigated. The disease-free and endemic equilibrium were investigated, as well as the basic reproduction number, R0, also calculated using the next-generation matrix approach. When R0 < 1, the model's stability analysis reveals that the system is asymptotically stable at disease-free critical point globally as well as locally. If R0 > 1, the system is asymptotically stable at disease-endemic equilibrium both locally and globally. The long-term behaviour of the skin sores model's steady-state solution in a population is investigated using numerical simulations of the model.
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Pérez M, Robres P, Moreno B, Bolea R, Verde MT, Pérez-Laguna V, Aspiroz C, Gilaberte Y, Rezusta A. Comparison of Antibacterial Activity and Wound Healing in a Superficial Abrasion Mouse Model of Staphylococcus aureus Skin Infection Using Photodynamic Therapy Based on Methylene Blue or Mupirocin or Both. Front Med (Lausanne) 2021; 8:673408. [PMID: 34113639 PMCID: PMC8185160 DOI: 10.3389/fmed.2021.673408] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 04/28/2021] [Indexed: 12/11/2022] Open
Abstract
Background: Antibiotic resistance and impaired wound healing are major concerns in S. aureus superficial skin infections, and new therapies are needed. Antimicrobial photodynamic therapy (aPDT) is a new therapeutic approach for infections, but it also improves healing in many wound models. Objective: To compare the antimicrobial activity and the effects on wound healing of aPDT based on Methylene Blue (MB-aPDT) with mupirocin treatment, either alone or in combination, in superficial skin wounds of S. aureus-infected mice. Additionally, to evaluate the clinical, microbiological, and cosmetic effects on wound healing. Materials and Methods: A superficial skin infection model of S. aureus was established in SKH-1 mice. Infected wounds were treated with MB-aPDT, MB-aPDT with a daily topical mupirocin or only with mupirocin. No treatment was carried out in control animals. Daily clinical and microbiological examinations were performed until complete clinical wound healing. Histopathological studies and statistical analysis were performed at the end of the study. Results: MB-aPDT treatment induced the best wound healing compared to mupirocin alone or to mupirocin plus MB-aPDT. Superficial contraction at 24 h and a greater reduction in size at 48 h, quicker detachment of the crust, less scaling, and absence of scars were observed. Histopathological studies correlated with clinical and gross findings. By contrast, mupirocin showed the highest logaritmic reduction of S. aureus. Conclusions: MB-aPDT and mupirocin treatments are effective in a murine superficial skin infection model of S. aureus. One session of MB-aPDT was the best option for clinical wound healing and cosmetic results. The addition of mupirocin to MB-aPDT treatment improved antimicrobial activity; however, it did not enhance wound healing. No synergistic antibacterial effects were detected.
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Affiliation(s)
- Montserrat Pérez
- Animal Pathology Department, Veterinary Faculty, Zaragoza University, Zaragoza, Spain
| | - Pilar Robres
- Department of Microbiology, Hospital de Barbastro, Huesca, Spain
| | - Bernardino Moreno
- Animal Pathology Department, Veterinary Faculty, Zaragoza University, Zaragoza, Spain
| | - Rosa Bolea
- Animal Pathology Department, Veterinary Faculty, Zaragoza University, Zaragoza, Spain
| | - Maria T. Verde
- Animal Pathology Department, Veterinary Faculty, Zaragoza University, Zaragoza, Spain
| | - Vanesa Pérez-Laguna
- Department of Microbiology, Hospital Universitario Miguel Servet, IIS Aragón, Zaragoza, Spain
| | - Carmen Aspiroz
- Department of Microbiology, Hospital Royo Villanova, IIS Aragón, Zaragoza, Spain
| | - Yolanda Gilaberte
- Department of Dermatology, Hospital Universitario Miguel Servet, IIS Aragón, Zaragoza, Spain
| | - Antonio Rezusta
- Department of Microbiology, Hospital Universitario Miguel Servet, IIS Aragón, Zaragoza, Spain
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