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Mendes PM, Gomes Fontoura GM, Rodrigues LDS, Souza AS, Viana JPM, Fernandes Pereira AL, Dutra RP, Nogueira Ferreira AG, Neto MS, Reis AS, Berretta AA, Monteiro-Neto V, Maciel MCG. Therapeutic Potential of Punica granatum and Isolated Compounds: Evidence-Based Advances to Treat Bacterial Infections. Int J Microbiol 2023; 2023:4026440. [PMID: 38144901 PMCID: PMC10746376 DOI: 10.1155/2023/4026440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 11/17/2023] [Accepted: 11/30/2023] [Indexed: 12/26/2023] Open
Abstract
Punica granatum Linn has been known for its nutritional and medicinal value since ancient times and is used in the treatment of various pathologies owing to its antibacterial properties. This review reports the results of the most recent studies on the antibacterial effects of P. granatum and its isolated compounds on bacteria of clinical interest. A search in the PubMed, Scopus, Science Direct, and Science Citation Index Expanded (Web of Science) databases was performed, which included articles that evaluated the antibacterial activity of P. granatum extracts and excluded articles that analyzed other microorganisms or nonpathogenic bacteria, as well as theses, dissertations, duplicate articles, and those not fully available. The literature suggests that P. granatum extracts can act on bacteria, such as methicillin-sensitive Staphylococcus aureus (MSSA), methicillin-resistant S. aureus (MRSA), Streptococcus mutans, Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae. In addition, fruit peel was the most commonly used pharmacogen and methanol, ethanol, and water were the most common solvents for the extraction of bioactive compounds. The antibacterial potential of the methanolic extract of pomegranate peel could be attributed to the presence of active compounds, such as 5-hydroxymethylfurfural, punicic acid, gallic acid, and punicalagin. Thus, there is evidence that these plant extracts, having high polyphenol content, can disrupt the bacterial plasma membrane and inhibit the action of proteins related to antimicrobial resistance. P. granatum shows antibacterial activity against Gram-positive and Gram-negative bacteria, with great potential against multidrug-resistant strains. Further research is needed to clarify the mechanism of action related to this biological activity and investigate the isolated substances that may be responsible for the antibacterial effects.
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Affiliation(s)
| | - Guilherme Martins Gomes Fontoura
- Graduate Program in Health and Technology, Center of Sciences in Imperatriz, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | | | - Aloiso Sampaio Souza
- Department of Medicine, Afya Faculty of Medical Sciences, Bragança 68600-000, Brazil
| | | | - Ana Lucia Fernandes Pereira
- Graduate Program in Health and Technology, Center of Sciences in Imperatriz, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Richard Pereira Dutra
- Graduate Program in Health and Technology, Center of Sciences in Imperatriz, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Adriana Gomes Nogueira Ferreira
- Graduate Program in Health and Technology, Center of Sciences in Imperatriz, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Marcelino Santos Neto
- Graduate Program in Health and Technology, Center of Sciences in Imperatriz, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Aramys Silva Reis
- Graduate Program in Health and Technology, Center of Sciences in Imperatriz, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Andresa Aparecida Berretta
- Research, Development & Innovation Department, Apis Flora Industrial e Comercial Ltda, São Paulo 14020-670, Brazil
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Dutra RP, de Sousa MM, Mignoni MSPM, de Oliveira KGM, Pereira EB, Figueredo AS, da Costa AAC, Dias TG, Vasconcelos CC, Silva LA, Reis AS, Lopes AJO. Brazilian Amazon Red Propolis: Leishmanicidal Activity and Chemical Composition of a New Variety of Red Propolis. Metabolites 2023; 13:1027. [PMID: 37755307 PMCID: PMC10535413 DOI: 10.3390/metabo13091027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 09/16/2023] [Accepted: 09/19/2023] [Indexed: 09/28/2023] Open
Abstract
Leishmaniasis is caused by protozoans of the genus Leishmania, and its treatment is highly toxic, leading to treatment discontinuation and the emergence of resistant strains. In this study, we assessed the leishmanicidal activity and chemical composition of red propolis collected from the Amazon-dominated region of northern Tocantins State, Brazil. The MTT assay was employed to determine the samples' activity against Leishmania amazonensis promastigotes and their cytotoxicity against RAW macrophages. Spectrophotometric assays were utilised to measure the concentrations of total phenolics and flavonoids, while high-performance liquid chromatography coupled to a mass spectrometer (LC-MS/MS) was used to determine the chemical composition. An in silico study was conducted to evaluate which compounds from Brazilian Amazon red propolis may correlate with this biological activity. Brazilian Amazon red propolis exhibited a high concentration of phenolic compounds and an inhibitory activity against L. amazonensis, with an IC50 ranging from 23.37 to 36.10 µg/mL. Moreover, fractionation of the propolis yielded a fraction with enhanced bioactivity (16.11 µg/mL). Interestingly, neither the propolis nor its most active fraction showed cytotoxicity towards macrophages at concentrations up to 200 µg/mL. The red colour and the presence of isoflavonoid components (isoflavones, isoflavans, and pterocarpans) confirm that the substance is Brazilian red propolis. However, the absence of polyprenylated benzophenones suggests that this is a new variety of Brazilian red propolis. The in silico study performed with two of the main leishmanicidal drug targets using all compounds identified in Amazon red propolis reported that liquiritigenin was the compound that exhibited the best electronic interaction parameters, which was confirmed in an assay with promastigotes using a standard. The findings indicate that Amazon red propolis possesses leishmanicidal activity, low toxicity, and significant biotechnological potential.
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Affiliation(s)
- Richard Pereira Dutra
- Laboratory of Natural Products Chemistry, Federal University of Maranhão, Imperatriz 65915-240, Brazil
- Program in Health and Technology, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Marcos Marinho de Sousa
- Laboratory of Natural Products Chemistry, Federal University of Maranhão, Imperatriz 65915-240, Brazil
- Program in Health and Technology, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Maria Simone Pereira Maciel Mignoni
- Laboratory of Natural Products Chemistry, Federal University of Maranhão, Imperatriz 65915-240, Brazil
- Program in Health and Technology, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | | | - Euzineti Borges Pereira
- Laboratory of Natural Products Chemistry, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Aline Santana Figueredo
- Laboratory of Pathology and Immunoparasitology, Federal University of Maranhão, São Luís 65080-805, Brazil
- Biological and Health Sciences Center, Federal University of Maranhão, Av. dos Portugueses 1966, São Luís 65085–580, Brazil
| | - Arthur André Castro da Costa
- Laboratory of Pathology and Immunoparasitology, Federal University of Maranhão, São Luís 65080-805, Brazil
- Biological and Health Sciences Center, Federal University of Maranhão, Av. dos Portugueses 1966, São Luís 65085–580, Brazil
| | - Tatielle Gomes Dias
- Program in Health and Technology, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Cleydlenne Costa Vasconcelos
- Biological and Health Sciences Center, Federal University of Maranhão, Av. dos Portugueses 1966, São Luís 65085–580, Brazil
| | - Lucilene Amorim Silva
- Laboratory of Pathology and Immunoparasitology, Federal University of Maranhão, São Luís 65080-805, Brazil
- Biological and Health Sciences Center, Federal University of Maranhão, Av. dos Portugueses 1966, São Luís 65085–580, Brazil
| | - Aramys Silva Reis
- Program in Health and Technology, Federal University of Maranhão, Imperatriz 65915-240, Brazil
| | - Alberto Jorge Oliveira Lopes
- Chemistry Postgraduate Program, Federal Institute of Science Education and Technology of Maranhão, São Luís 65030-005, Brazil
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Dias TG, Rodrigues LDS, Farias JR, Pereira ALF, Ferreira AGN, Neto MS, Dutra RP, Reis AS, Guerra RNM, Monteiro-Neto V, Maciel MCG. Immunomodulatory Activity of Probiotics in Models of Bacterial Infections. Probiotics Antimicrob Proteins 2023:10.1007/s12602-023-10090-6. [PMID: 37191780 DOI: 10.1007/s12602-023-10090-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/08/2023] [Indexed: 05/17/2023]
Abstract
As resistance to conventional antibiotics among bacteria continues to increase, researchers are increasingly focusing on alternative strategies for preventing and treating bacterial infections, one of which is microbiota modulation. The objective of this review is to analyze the scientific literature on the immunomodulatory effects of probiotics in bacterial infections. This is an integrative review of the literature based on systematic steps, with searches performed in the databases Medline, PubMed, Scopus, Embase, and ScienceDirect. The most prevalent bacterial genera used to evaluate infectious processes were Salmonella, Escherichia, Klebsiella, and Streptococcus. Lactobacillus was the most commonly used probiotic genus, with Lactobacillus delbrueckii subsp. bulgaricus is the most frequently used species. In most studies, prophylactic treatment with concentrations of probiotics equal to or greater than 8 log CFU/mL was chosen. However, there was considerable heterogeneity in terms of effective treatment duration, indicating that the results cannot be generalized across all studies. This review found that probiotics interact with the immune system through different mechanisms and have a positive effect on preventing different types of bacterial infections.
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Affiliation(s)
- Tatielle Gomes Dias
- Graduate Program in Health and Technology, Center for Sciences of Imperatriz, Federal University of Maranhão, Maranhão, Brazil
| | | | - Josivan Regis Farias
- Graduate Program in Health Sciences, Federal University of Maranhão, São Luís, Maranhão, Brazil
| | - Ana Lúcia Fernandes Pereira
- Graduate Program in Health and Technology, Center for Sciences of Imperatriz, Federal University of Maranhão, Maranhão, Brazil
| | - Adriana Gomes Nogueira Ferreira
- Graduate Program in Health and Technology, Center for Sciences of Imperatriz, Federal University of Maranhão, Maranhão, Brazil
| | - Marcelino Santos Neto
- Graduate Program in Health and Technology, Center for Sciences of Imperatriz, Federal University of Maranhão, Maranhão, Brazil
| | - Richard Pereira Dutra
- Graduate Program in Health and Technology, Center for Sciences of Imperatriz, Federal University of Maranhão, Maranhão, Brazil
| | - Aramys Silva Reis
- Graduate Program in Health and Technology, Center for Sciences of Imperatriz, Federal University of Maranhão, Maranhão, Brazil
| | - Rosane Nassar Meireles Guerra
- Graduate Program in Health Sciences, Federal University of Maranhão, São Luís, Maranhão, Brazil
- Department of Pathology, Federal University of Maranhão, São Luís, Maranhão, Brazil
| | | | - Márcia Cristina Gonçalves Maciel
- Graduate Program in Health and Technology, Center for Sciences of Imperatriz, Federal University of Maranhão, Maranhão, Brazil.
- Department of Cell Biology, University of Brasília, Brasília, Distrito Federal, Brazil.
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Barboza R, Hasenkamp L, Barateiro A, Murillo O, Peixoto EPM, Lima FA, Reis AS, Gonçalves LA, Epiphanio S, Marinho CRF. Fetal-Derived MyD88 Signaling Contributes to Poor Pregnancy Outcomes During Gestational Malaria. Front Microbiol 2019; 10:68. [PMID: 30761111 PMCID: PMC6362412 DOI: 10.3389/fmicb.2019.00068] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Accepted: 01/15/2019] [Indexed: 12/17/2022] Open
Abstract
Placental malaria (PM) remains a severe public health problem in areas of high malaria transmission. Despite the efforts to prevent infection poor outcomes in Plasmodium endemic areas, there is still a considerable number of preterm births and newborns with low birth weight resulting from PM. Although local inflammation triggered in response to malaria is considered crucial in inducing placental damage, little is known about the differential influence of maternal and fetal immune responses to the disease progression. Therefore, using a PM mouse model, we sought to determine the contribution of maternal and fetal innate immune responses to PM development. For this, we conducted a series of cross-breeding experiments between mice that had differential expression of the MyD88 adaptor protein to obtain mother and correspondent fetuses with distinct genetic backgrounds. By evaluating fetal weight and placental vascular spaces, we have shown that the expression of MyD88 in fetal tissue has a significant impact on PM outcomes. Our results highlighted the existence of a distinct contribution of maternal and fetal immune responses to PM onset. Thus, contributing to the understanding of how inflammatory processes lead to the dysregulation of placental homeostasis ultimately impairing fetal development.
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Affiliation(s)
- Renato Barboza
- Departamento de Ciências Biológicas, Universidade Federal de São Paulo, Diadema, Brazil
| | - Lutero Hasenkamp
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - André Barateiro
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Oscar Murillo
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Erika Paula Machado Peixoto
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Flávia Afonso Lima
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Aramys Silva Reis
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Lígia Antunes Gonçalves
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Sabrina Epiphanio
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil
| | - Claudio R F Marinho
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
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Protachevicz PR, Borges RR, Reis AS, Borges FS, Iarosz KC, Caldas IL, Lameu EL, Macau EEN, Viana RL, Sokolov IM, Ferrari FAS, Kurths J, Batista AM, Lo CY, He Y, Lin CP. Synchronous behaviour in network model based on human cortico-cortical connections. Physiol Meas 2018; 39:074006. [DOI: 10.1088/1361-6579/aace91] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Barboza R, Lima FA, Reis AS, Murillo OJ, Peixoto EPM, Bandeira CL, Fotoran WL, Sardinha LR, Wunderlich G, Bevilacqua E, Lima MRD, Alvarez JM, Costa FTM, Gonçalves LA, Epiphanio S, Marinho CRF. Publisher Correction: TLR4-Mediated Placental Pathology and Pregnancy Outcome in Experimental Malaria. Sci Rep 2018; 8:4275. [PMID: 29511268 PMCID: PMC5840132 DOI: 10.1038/s41598-018-21982-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Affiliation(s)
- Renato Barboza
- Departamento de Ciências Biológicas, Universidade Federal de São Paulo, Diadema, Brazil
| | - Flávia Afonso Lima
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Sao Paulo, Brazil
| | - Aramys Silva Reis
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Sao Paulo, Brazil
| | - Oscar Javier Murillo
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Sao Paulo, Brazil
| | - Erika Paula Machado Peixoto
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Sao Paulo, Brazil
| | - Carla Letícia Bandeira
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Sao Paulo, Brazil
| | - Wesley Luzetti Fotoran
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Sao Paulo, Brazil
| | | | - Gerhard Wunderlich
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Sao Paulo, Brazil
| | - Estela Bevilacqua
- Departamento de Biologia Celular e do Desenvolvimento, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Maria Regina D'Império Lima
- Departamento de Genética, Evolução e Bioagentes, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Brazil
| | - José Maria Alvarez
- Departamento de Genética, Evolução e Bioagentes, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Brazil
| | | | - Lígia Antunes Gonçalves
- Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Sao Paulo, Brazil
| | - Sabrina Epiphanio
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil
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Cysne DN, Fortes TS, Reis AS, de Paulo Ribeiro B, dos Santos Ferreira A, do Amaral FMM, Guerra RNM, Marinho CRF, Nicolete R, Nascimento FRF. Antimalarial potential of leaves of Chenopodium ambrosioides L. Parasitol Res 2016; 115:4327-4334. [DOI: 10.1007/s00436-016-5216-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 07/27/2016] [Indexed: 12/20/2022]
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Rodrigues JRA, Silva-Júnior JLRD, Paredes ADO, Reis AS, Silva LADC. Doença de Chagas Aguda no Estado do Maranhão, Brasil: Uma comparação entre os bancos de dados do SINAN e da FUNASA. ACTA ACUST UNITED AC 2013. [DOI: 10.14295/jmphc.v4i1.160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A doença de Chagas é uma parasitose endêmica e com alta prevalência na América Latina. O objetivo desse trabalho foi comparar os dados de notificação da doença no SINAN (Sistema de Informação de Agravos de Notificação) e na FUNASA (Fundação Nacional de Saúde) e avaliar o perfil da doença no Estado do Maranhão. Foram utilizados os dados da Secretaria de Saúde do Estado e da FUNASA-MA de 2007 a 2011. A análise resultou em divergências entre as duas fontes de informações quanto ao número de casos por ano, cidades afetadas e, principalmente, em relação ao modo de transmissão. Os indivíduos mais atingidos foram os da fase adulta, pertencentes ao sexo masculino e moradores da zona rural. Além disso, a doença apresentou uma baixa mortalidade. A falta de treinamento dos técnicos responsáveis pela coleta e abastecimento dos dados e até mesmo o diagnóstico incorreto são fatores que podem estar envolvidos nas divergências entre os dois bancos de dados. Logo, é necessário a busca de mecanismos que melhorem a vigilância epidemiológica e obtenção de dados mais confiáveis da Doença de Chagas.
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Araújo MJAM, Mattar NS, Reis AS, Serra ICPB, Fialho EMS, Assunção AKM, Dutra RP, Nogueira AMC, Libério SA, Guerra RNM, Lopes AS, Ribeiro MNS, Nascimento FRF. Pharmacognostic and acute toxicological evaluation of Scaptotrigona aff. postica propolis extract in pre-clinical assays. Nat Prod Res 2011; 25:1037-46. [PMID: 21500093 DOI: 10.1080/14786419.2010.482059] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The propolis of Scaptotrigona aff. postica is popularly used in Maranhão State, Brazil, for treating wounds and respiratory illnesses. Nevertheless, little is known about the chemical composition of this propolis and the adverse effects of its use. Hence, this study is a pharmacognostic characterisation of the propolis hydroalcoholic extract (PHE) from S. aff. postica. The methodology consisted of an evaluation of the sensory and chemical parameters. Chemical analysis of PHE indicated high concentrations of phenolic and triterpens substances, and the absence of steroids. Additionally, we evaluated the acute toxicity of propolis using 48 Swiss male and female mice. The animals received single doses of PHE (1000, 2000 or 4000 mg kg⁻¹) orally and were observed for 14 days. After this period, the mice were sacrificed and the blood was used for biochemical and haematological evaluation. PHE did not induce any death, and the acute treatment significantly reduced serum concentrations of alanine aminotransferase and alkaline phosphatase. The resultant data indicate that PHE from S. aff. postica has low toxicity when used orally, even in high doses.
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Affiliation(s)
- M J A M Araújo
- Laboratory of Immunophysiology, Healthy and Biological Sciences Centre, Federal University of Maranhão, São Luís, MA 65085-580, Brazil
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Mensor LL, Menezes FS, Leitão GG, Reis AS, dos Santos TC, Coube CS, Leitão SG. Screening of Brazilian plant extracts for antioxidant activity by the use of DPPH free radical method. Phytother Res 2001; 15:127-30. [PMID: 11268111 DOI: 10.1002/ptr.687] [Citation(s) in RCA: 930] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Brazilian plant extracts belonging to 16 species of 5 different families (71 extracts) were tested against the stable DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) free-radical. The ability to scavenge DPPH radical was measured in these experiments by the discoloration of the solution. Ginkgo biloba and rutin, commonly used as antioxidants for medical purposes, were used as standards. Based on our results, we can say that as a general rule the ethanol extracts of plants belonging to the Verbenaceae family showed lower EC(50) values than the other plant extracts. Among the partitions, the more polar ones (ethyl acetate and n-butanol) are those that generally have higher antioxidant activity (AA).
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Affiliation(s)
- L L Mensor
- Departamento de Produtos Naturais e Alimentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Centro de Ciências de Saúde, Bl. A, Ilha do Fundão, Rio de Janeiro, 21941-590 RJ, Brazil
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Reis AS, Chagas AP. A Thermodynamic Study of Interactions of Monoionic Kaolinite with N,N-Dimethylacetamide (DMA) and Pyridine (PY). J Colloid Interface Sci 1996; 177:1-8. [PMID: 10479412 DOI: 10.1006/jcis.1996.0001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two series of monoionic (M) kaolinites (M = H(+), Ca(2+), Cu(2+), Zn(2+), Al(3+), and Fe(3+)) were prepared from a natural Brazilian clay (São Simão clay, SP): series A, dried under vacuum at 25 degrees C, and series B, dried under vacuum at 25 degrees C. The natural clay was characterized by elemental analysis, cation exchange capacity, X-ray diffractometry, differential thermal analysis, and surface area measurements (BET). The interactions of M,M-dimethylacetamide and pyridine with these (M) kaolinites were studied by adsorption isotherms, titration calorimetry, and infrared spectroscopy (for pyridine only). The results indicated a coordinative interaction between M,M-dimethylacetamide and (M) kaolinites. For the interactions between pyridine and (M) kaolinites, the formation of hydrogen bonds (M = Al(3+), Fe(3+)), hydrogen and coordinative bonds (M = Cu(2+), Zn(2+)), and ionic pairs (M = H(+), Ca(2+)) was observed. For the pyridine-(Cu) kaolinite system, a substitution of water coordinated to Cu(2+) by pyridine was established.
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Affiliation(s)
- AS Reis
- Instituto de Química, Universidade Estadual de Campinas, Campinas (SP), 13083-970, Brazil
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