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  1. Article: FTIR analysis of pyrogallol and phytotoxicity-reductive effect against mercury chloride

    Rocha, Janaina E / Guedes, Tássia T. A. M / Bezerra, Camila F / Costa, Maria do S / Campina, Fabia F / de Freitas, Thiago S / Sousa, Amanda K / Sobral Souza, Celestina E / Silva, Maria K. N / Lobo, Yedda M / Pereira-Junior, Francisco N / da Silva, João H / Menezes, Irwin R. A / Teixeira, Raimundo N. P / Colares, Aracélio V / Coutinho, Henrique D. M

    Environmental geochemistry and health. 2021 June, v. 43, no. 6

    2021  

    Abstract: Human activities, especially in industry, have contributed to soil contamination with heavy or toxic metals. The objective of this study was to determine the chelating effect and antioxidant activity of pyrogallol, as well as to evaluate its ... ...

    Abstract Human activities, especially in industry, have contributed to soil contamination with heavy or toxic metals. The objective of this study was to determine the chelating effect and antioxidant activity of pyrogallol, as well as to evaluate its cytoprotective activity in prokaryotic and eukaryotic models, animal and plant, respectively, against toxic mercury chloride action. Antioxidant activity was determined by DPPH where pyrogallol showed considerable action, chelating even iron ions. For the microbiologic activity assays, microdilution was performed to obtain the minimal inhibitory concentration, minimum bactericidal and minimum fungicide concentration, from which the sub-inhibitory concentrations were determined. The product did not conferred cytoprotection to the tested bacteria and fungi. To evaluate plant cytoprotection, Lactuta sativa seeds were used together with the product at a sub-allelopathic concentration with different HgCl₂ concentrations. In this case, the tannin conferred cytoprotection to the plant model, allowing the best growth and development of caulicles and radicles, thus preserving tissues necessary for plant survival. From the results, it is observable that pyrogallol possesses cytoprotective action in the eukaryotic plant model, this action being useful as an alternative which favors the growth of plants in contaminated areas, as the recovering of crop fields or reforestation projects.
    Keywords Lactuca sativa ; antioxidant activity ; geochemistry ; growth and development ; humans ; industry ; mercuric chloride ; minimum inhibitory concentration ; models ; pyrogallol ; reforestation ; soil pollution ; toxicity
    Language English
    Dates of publication 2021-06
    Size p. 2433-2442.
    Publishing place Springer Netherlands
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 52039-1
    ISSN 1573-2983 ; 0142-7245 ; 0269-4042
    ISSN (online) 1573-2983
    ISSN 0142-7245 ; 0269-4042
    DOI 10.1007/s10653-020-00607-1
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: FTIR analysis of pyrogallol and phytotoxicity-reductive effect against mercury chloride.

    Rocha, Janaina E / Guedes, Tássia T A M / Bezerra, Camila F / Costa, Maria do S / Campina, Fabia F / de Freitas, Thiago S / Sousa, Amanda K / Sobral Souza, Celestina E / Silva, Maria K N / Lobo, Yedda M / Pereira-Junior, Francisco N / da Silva, João H / Menezes, Irwin R A / Teixeira, Raimundo N P / Colares, Aracélio V / Coutinho, Henrique D M

    Environmental geochemistry and health

    2020  Volume 43, Issue 6, Page(s) 2433–2442

    Abstract: Human activities, especially in industry, have contributed to soil contamination with heavy or toxic metals. The objective of this study was to determine the chelating effect and antioxidant activity of pyrogallol, as well as to evaluate its ... ...

    Abstract Human activities, especially in industry, have contributed to soil contamination with heavy or toxic metals. The objective of this study was to determine the chelating effect and antioxidant activity of pyrogallol, as well as to evaluate its cytoprotective activity in prokaryotic and eukaryotic models, animal and plant, respectively, against toxic mercury chloride action. Antioxidant activity was determined by DPPH where pyrogallol showed considerable action, chelating even iron ions. For the microbiologic activity assays, microdilution was performed to obtain the minimal inhibitory concentration, minimum bactericidal and minimum fungicide concentration, from which the sub-inhibitory concentrations were determined. The product did not conferred cytoprotection to the tested bacteria and fungi. To evaluate plant cytoprotection, Lactuta sativa seeds were used together with the product at a sub-allelopathic concentration with different HgCl
    MeSH term(s) Allelopathy ; Antioxidants/chemistry ; Antioxidants/pharmacology ; Chelating Agents/chemistry ; Chelating Agents/pharmacology ; Germination/drug effects ; Iron Chelating Agents/chemistry ; Iron Chelating Agents/pharmacology ; Lactuca/drug effects ; Mercuric Chloride/chemistry ; Mercuric Chloride/toxicity ; Microbial Sensitivity Tests ; Pyrogallol/chemistry ; Pyrogallol/pharmacology ; Seeds/drug effects ; Soil Pollutants/toxicity ; Spectroscopy, Fourier Transform Infrared/methods
    Chemical Substances Antioxidants ; Chelating Agents ; Iron Chelating Agents ; Soil Pollutants ; Pyrogallol (01Y4A2QXY0) ; Mercuric Chloride (53GH7MZT1R)
    Language English
    Publishing date 2020-06-02
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 52039-1
    ISSN 1573-2983 ; 0142-7245 ; 0269-4042
    ISSN (online) 1573-2983
    ISSN 0142-7245 ; 0269-4042
    DOI 10.1007/s10653-020-00607-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 4723: Show issues Location:
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  3. Article ; Online: Potentiation of antibiotic activity of aminoglycosides by natural products from Cordia verbenacea DC.

    Matias, Edinardo F F / Alves, Erivania F / Silva, Maria K N / Carvalho, Victoria R A / Medeiros, Cassio R / Santos, Francisco A V / Bitu, Vanessa C N / Souza, Celestina E S / Figueredo, Fernando G / Boligon, Aline A / Athayde, Margareth L / Costa, José G M / Coutinho, Henrique D M

    Microbial pathogenesis

    2016  Volume 95, Page(s) 111–116

    Abstract: Medicinal plants are often the only therapeutic resource for many communities and ethnic groups. Cordia verbenacea DC., "Erva-baleeira," is one of the species of plants currently used to produce a phytotherapeutic product extracted from its leaves. The ... ...

    Abstract Medicinal plants are often the only therapeutic resource for many communities and ethnic groups. Cordia verbenacea DC., "Erva-baleeira," is one of the species of plants currently used to produce a phytotherapeutic product extracted from its leaves. The present study aimed to establish its chemical profile, antibacterial activity and resistance-modulating potential. The C. verbenacea extracts were prepared from fresh leaves using solvents as methanol and hexane. Ethyl Acetate was used for the preparation of the fraction. Phytochemical screening was carried out using HPLC-DAD for determination and quantification of the secondary metabolites present in the fractions. Antibacterial and resistance-modulation assays were performed to determine minimum inhibitory concentration (MIC) using a microdilution assay. The data were subjected to statistical analysis with two-way ANOVA and Bonferroni posttests. Results of phytochemical prospecting and HPLC analysis of the fractions were in agreement with the literature. The natural products presented moderate antibacterial activity when considering the clinical relevance of a MIC of 256 μg/mL against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, and 512 μg/mL against P. aeruginosa. However, when the fractions were combined with antibiotics we observed a synergic effect, as natural products enhanced the antibacterial effect of aminoglycosides, significantly decreasing the MIC of antibiotics at 12.5%-98.4%. We believe that the data obtained from phytochemical analysis and from antibacterial and resistance modulation assays of C. verbenacea extracts new can open perspectives in the search for new alternatives for the treatment of bacterial infections and stimulate the renewed use of antibiotics with reduced effectiveness due to resistance.
    MeSH term(s) Aminoglycosides/pharmacology ; Anti-Bacterial Agents/isolation & purification ; Anti-Bacterial Agents/pharmacology ; Biological Products/isolation & purification ; Biological Products/pharmacology ; Chromatography, High Pressure Liquid ; Cordia/chemistry ; Drug Synergism ; Escherichia coli/drug effects ; Microbial Sensitivity Tests ; Phytochemicals/analysis ; Phytochemicals/isolation & purification ; Phytochemicals/pharmacology ; Plant Leaves/chemistry ; Pseudomonas aeruginosa/drug effects ; Staphylococcus aureus/drug effects
    Chemical Substances Aminoglycosides ; Anti-Bacterial Agents ; Biological Products ; Phytochemicals
    Language English
    Publishing date 2016-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 632772-2
    ISSN 1096-1208 ; 0882-4010
    ISSN (online) 1096-1208
    ISSN 0882-4010
    DOI 10.1016/j.micpath.2016.03.009
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2136: Show issues Location:
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  4. Article ; Online: Antibacterial activity and antibiotic modulating potential of the essential oil obtained from Eugenia jambolana in association with led lights.

    Pereira, Nara L F / Aquino, Pedro E A / Júnior, José G A S / Cristo, Janyketchuly S / Vieira Filho, Marcos A / Moura, Flávio F / Ferreira, Najla M N / Silva, Maria K N / Nascimento, Eloiza M / Correia, Fabrina M A / Cunha, Francisco A B / Boligon, Aline A / Coutinho, Henrique D M / Ribeiro-Filho, Jaime / Matias, Edinardo F F / Guedes, Maria I F

    Journal of photochemistry and photobiology. B, Biology

    2017  Volume 174, Page(s) 144–149

    Abstract: Bacterial resistance has risen as an important health problem with impact on the pharmaceutical industry because many antibiotics have become ineffective, which has affected their commercialization. The Brazilian biodiversity is marked by a vast variety ... ...

    Abstract Bacterial resistance has risen as an important health problem with impact on the pharmaceutical industry because many antibiotics have become ineffective, which has affected their commercialization. The Brazilian biodiversity is marked by a vast variety of natural products with significant therapeutic potential, which could bring new perspectives in the treatment of infections caused by resistant microorganisms. The present study aimed to evaluate the antibacterial effect of the essential oil obtained from Eugenia jambolana (EjEO) using the method of microdilution method to determine the Minimum Inhibitory Concentration (MIC). The modulatory effect of this oil on antibiotic activity was determined using both the broth microdilution and gaseous contact methods. The antibacterial effect of the association of the gaseous contact and the use of a LED unit with red and blue lights was also determined. The chemical components of the EjEO were characterized by HPLC, which revealed the presence of α-pinene as a major constituent. The EjEO presented a MIC≥128μg/mL against S. aureus and ≥1024μg/mL against E. coli. The combination of the EjEO with antibiotics presented synergism against E. coli and antagonism against S. aureus. An antagonistic effect was obtained from the association of EjEO with amikacin and erythromycin by the method of gaseous contact. On the other hand, the association of EjEO with ciprofloxacin presented a synergistic effect against S. aureus and E. coli exposed to LED lights. A similar effect was observed in the association of the EjEO with norfloxacin presented synergism against S. aureus in the same conditions. In conclusion, our results demonstrated that the essential oil obtained from Eugenia jambolana interfere with the action of antibiotics against bacteria exposed to LED lights. Thus, further researches are required to elucidate the mechanisms underlying these effects, which could open new perspectives in the development of new antibacterial therapies.
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Escherichia coli/drug effects ; Escherichia coli/radiation effects ; Light ; Microbial Sensitivity Tests ; Oils, Volatile/pharmacology ; Plant Oils/pharmacology ; Staphylococcus aureus/drug effects ; Staphylococcus aureus/radiation effects ; Syzygium/chemistry
    Chemical Substances Anti-Bacterial Agents ; Oils, Volatile ; Plant Oils
    Language English
    Publishing date 2017-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 623022-2
    ISSN 1873-2682 ; 1011-1344
    ISSN (online) 1873-2682
    ISSN 1011-1344
    DOI 10.1016/j.jphotobiol.2017.07.027
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 2347: Show issues Location:
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  5. Article ; Online: In vitro evaluation of the antibacterial potential and modification of antibiotic activity of the Eugenia uniflora L. essential oil in association with led lights.

    Pereira, Nara L F / Aquino, Pedro E A / Júnior, José G A S / Cristo, Janyketchuly S / Vieira Filho, Marcos A / Moura, Flávio F / Ferreira, Najla M N / Silva, Maria K N / Nascimento, Eloiza M / Correia, Fabrina M A / Cunha, Francisco A B / Boligon, Aline A / Coutinho, Henrique D M / Matias, Edinardo F F / Guedes, Maria I F

    Microbial pathogenesis

    2017  Volume 110, Page(s) 512–518

    Abstract: Due to the great biodiversity of its flora, Brazil provides combat tools against bacterial resistance with the utilization of natural products with vegetable origin. Therefore, the present study had as its objective to evaluate the antibacterial ... ...

    Abstract Due to the great biodiversity of its flora, Brazil provides combat tools against bacterial resistance with the utilization of natural products with vegetable origin. Therefore, the present study had as its objective to evaluate the antibacterial potential of the Eugenia uniflora essential oil (EuEO) in vitro, as well as to analyze the modulatory effect of the oil against antibiotics by gaseous contact and to compare them when associated with a LED apparatus. The chemical components were characterised by gas chromatography which revealed the presence of the isoflurane-germacrene, considered the major component (61.69%). The MIC obtained from the EuEO was ≥256 μg/mL for S. aureus and ≥1024 μg/mL for E. coli. When combined with antibiotics, the EuEO presented synergism reducing the MIC when associated, with the exception of gentamicin against E. coli, where an antagonistic effect was observed. The was an interference of the EuEO over the activity of ciprofloxacin when associated with red and blue LED lights, increasing the inhibition halos against S. aureus and E. coli. Norfloxacin presented similar results to ciprofloxacin against S. aureus bacteria. When combined, norfloxacin and the EuEO presented synergism against S. aureus, which did not occur in the combination with ciprofloxacin. Interference occurred only with blue light for E. coli. Thus, it was observed that the EuEO causes changes in the activity of antibiotics, the same occurring with the use of LED lights, without significant differences in the association of the oil and the lights with the antibiotics tested. Further research is needed to elucidate the modulatory effects of the EuEO, as well as its association with LED lights.
    Language English
    Publishing date 2017-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 632772-2
    ISSN 1096-1208 ; 0882-4010
    ISSN (online) 1096-1208
    ISSN 0882-4010
    DOI 10.1016/j.micpath.2017.07.048
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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