Investigation of alumina/(+)-catechin system properties. Part I: a study of the system by FTIR-UV–Vis spectroscopy

Ramos-Tejada, María del Mar; Durán, J.D.G.; Ontiveros-Ortega, A.; Espinosa-Jiménez, M.; Perea-Carpio, R.; Chibowski, Emil

doi:10.1016/s0927-7765(01)00284-3

Cited by 45 publications

(19 citation statements)

References 10 publications

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“…However, further studies are needed with model protein and phenolic compounds in less complex systems than films to fully understand the individual contribution of H-bonds and other confounding factors in band shifting and broadening. The studies on possible roles of phenolic \OH groups in band broadening are particularly needed since phenolic compounds might also give peaks at the amide A, amide I and II regions (Ramos-Tejada et al, 2002;Robb, Geldart, Seelenbinder, & Brown, 2002).…”

Section: Mechanical Properties Of Filmsmentioning

confidence: 99%

Development of flexible zein–wax composite and zein–fatty acid blend films for controlled release of lysozyme

Arcan

Yemenicioğlu

2013

Food Research International

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The aim of this study was controlled release of lysozyme by modification of hydrophobicity and morphology of zein films using composite and blend film making methods. The incorporation of beeswax, carnauba or candelilla wax into films at 5% (w/w) of zein gave composite films containing amorphous wax particles, while incorporation of oleic acid into film at 5% of zein caused formation of blend films containing many spherical zein capsules within their matrix. The lysozyme release rates of composites reduced as the melting point of waxes increased. The composites and blends showed 2.5 to 17 fold lower lysozyme release rates than controls. The films were effectively plasticized by using catechin. The catechin also provided antioxidant activity of films (up to 69 μmol Trolox/cm 2 ) and contributed to their controlled release properties by reducing film porosity. The films showed antimicrobial activity against Listeria innocua. This work showed the possibility of obtaining advanced edible films having flexibility, antimicrobial and antioxidant activity and controlled release properties.

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Section: Mechanical Properties Of Filmsmentioning

confidence: 99%

Development of flexible zein–wax composite and zein–fatty acid blend films for controlled release of lysozyme

Arcan

Yemenicioğlu

2013

Food Research International

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“…Signals obtained from the hydromethanol fraction ( Figure 3) and hydroethanolic extract (Figure 4) showed profiles similar to those of tannins as gallic acid, tannic acid, catechin and pyrogallol Ramos-Tejada et al (2002). Queiroz et al (2002) using HPLC, identified fisetin, gallic acid and ellagic acid, in hydromethanolic and hydroacetonic extract M. urundeuva.…”

Section: High Performance Liquid Chromatography (Hplc) and Identificamentioning

confidence: 82%

Myracrondruon urundeuva Allemo: Chemical composition, antioxidant activity, antimicrobial activity and inotropic effect

Santos¹,

Lima²,

Andrade³

et al. 2017

Afr. J. Biotechnol.

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Caatinga biome features species with high therapeutic potential such as Aroeira do Sertão (Myracrodruon urundeuva Allemão) which has long history in folk medicine. This study aimed to chemically characterize the secondary metabolites of hydroethanolic extract and hexane, chloroform, acetate, hydroethanolic fractions from Myracrodruon urundeuva (Allemão) possibly responsible antioxidant and antimicrobial activity, besides to evaluate the inotropic effect of crude extract in the left atrium of Cavia porcellus. Phytochemical composition was evaluated by spectrophotometry and highperformance liquid chromatography (HPLC). Antioxidant activity was assessed by 2,2-diphenyl-1-picryl hidrazyl (DPPH•) scavenging and reactive substances to thiobarbituric acid methods. Inotropic effect was evaluated using the isolated organ model. Data were expressed as mean ± SEM and differences determined by ANOVA followed by Tukey test. Phytochemical screening and the HPLC confirmed the presence of flavonoids, terpenes, tannins. Acetate and Hydroethanolic extract showed inhibition of DPPH values of 81.56 and 93.28% respectively. On the other hand, TBARS reduced in extract were 64.13% in a concentration of 150 µg/mL. Hydroethanolic extract and acetate fraction with concentrations of 50 and 100 mg/mL showed inhibition zones between 11.00 and 20.50 mm suggesting antimicrobial activity against Enterococcus faecalis, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Proteus mirabilis, Klebsiella pneumoniae bacteria and Candida albicans. The isolated atrium model demonstrated that the extract acts non-competitively antagonizing muscle calcium currents, decreasing the force of contraction by about 60%. Flavonoids, terpenes and tannins are responsible for M. urundeuva (Allemão) biological effects.

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“…Sugerimos, então, a presença de compostos com potencial ação biológica já descrita para essa espécie, como, por exemplos, os taninos e flavonoides 3,15,16 , que apresentam atividade inibitória contra micro-organismos, além de efeito antioxidante, dentre outras atividades 9,17,18 . Dessa forma, os resultados deste trabalho corroboram para a utilização do extrato bruto de folhas de P. cattleianum sobre os micro-organismos do biofilme dental.…”

Section: Discussionunclassified

Atividade antimicrobiana in vitro das folhas de araçá (Psidium cattleianum Sabine) contra micro-organismos da mucosa oral

Alvarenga

Mota

Royo

et al. 2016

Rev. odontol. UNESP

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ResumoIntrodução: A espécie Psidium cattleianum Sabine tem despertado o interesse dos pesquisadores por apresentar, além de atividade cicatrizante, analgésica e antioxidante, propriedades antimicrobianas frente a micro-organismos da mucosa oral que podem atuar como agentes cariogênicos. Objetivo: Foi avaliada, neste trabalho, a atividade antimicrobiana de extratos bruto e fracionados das folhas do araçá, além do seu perfil cromatográfico. Material e método: Para avaliação da atividade antimicrobiana, foi utilizada a técnica de microdiluição, para determinação da Concentração Inibitória Mínima (CIM), e repique do inóculo em Ágar Muller Hinton (Himedia), para averiguação da Concentração Bactericida Mínima (CBM). O extrato foi testado nas concentrações entre 10 e 500 µg/mL. O perfil cromatográfico foi realizado pelo método de Cromatografia Líquida de Alta Eficiência (CLAE). Resultado: Os resultados obtidos foram submetidos a uma análise descritiva e foi possível observar a atividade inibitória dos extratos do P. cattleianum contra S. mutans e S. oralis. Conclusão: A atividade antimicrobiana dos extratos de P. cattleianum contra micro-organismos orais justifica maiores estudos para a utilização medicinal dessa espécie, como, por exemplo, sua utilização em enxaguantes bucais.Descritores: Agentes cariogênicos; plantas medicinais; perfil cromatográfico; microdiluição. Abstract Introduction:The specie Psidium cattleianum Sabine has aroused the interest of researchers to exhibit, healing activity, analgesic, antioxidant, antimicrobial properties against the micro-organisms of the oral mucosa that can act as cariogenic agents. Objective: It was analyzed in this study the antimicrobial activity of crude extracts and fractions and chromatographic profile of araçá. Material and method: For antimicrobial activity, we used the technique of on broth microdilution for determining the Minimum Inhibitory Concentration (MIC) and replating of inoculum in Muller Hinton (Himedia) agar for finding the Minimum Bactericidal Concentration (MBC). The extract was tested at concentrations between 10 and 500 µg/mL. The chromatographic profile was performed by the method of High Performance Liquid Chromatography. Result: The results were submitted to a descriptive analysis was possible to observe the inhibitory activity of the extracts of P. cattleianum against S. oralis and S. mutans. Conclusion: The antimicrobial activity of P. cattleianum extracts against oral microorganisms justifies the use of this species as a medicinal plant.

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Investigation of alumina/(+)-catechin system properties. Part I: a study of the system by FTIR-UV–Vis spectroscopy

Cited by 45 publications

References 10 publications

Development of flexible zein–wax composite and zein–fatty acid blend films for controlled release of lysozyme

Development of flexible zein–wax composite and zein–fatty acid blend films for controlled release of lysozyme

Myracrondruon urundeuva Allemo: Chemical composition, antioxidant activity, antimicrobial activity and inotropic effect

Atividade antimicrobiana in vitro das folhas de araçá (Psidium cattleianum Sabine) contra micro-organismos da mucosa oral

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