Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 13 de 13
Filtrar
Mais filtros











Intervalo de ano de publicação
1.
AAPS PharmSciTech ; 25(4): 71, 2024 Mar 27.
Artigo em Inglês | MEDLINE | ID: mdl-38538958

RESUMO

The development of cosmetic formulations with moisturizing and film-forming properties has been very important to help keep skin physiology and protection. In this context, this study aimed to develop a cosmetic formulation containing Tara gum and Brazilian berry extract and evaluate its physical-mechanical, film-forming, and sensory properties. A gel formulation was developed based on Tara gum added to Plinia cauliflora extract and was characterized by its spreadability profile and sensory properties. A clinical study was carried out with ten participants to evaluate the skin microrelief, stratum corneum water content, transepidermal water loss (TEWL), and skin morphological characteristics by reflectance confocal microscopy (RCM) before and after 2 h of application of the formulations. The formulation with Brazilian berry significantly decreased the work of shear parameter, which can be correlated with improved spreadability in the sensory analysis. The clinical study showed that both formulations improved skin hydration and reduced the TEWL. The RCM imaging analysis showed the visible film on the skin surface, a decrease in the size of furrows, an increase in the reflectance of the interkeratinocytes, and reflectance of the stratum corneum for both formulations. These results were more pronounced for the formulation containing Brazilian berry. The Tara gum in the gel formulation promoted the formation and visualization of a polymeric net on the stratum corneum surface, demonstrated by the images obtained from RCM. However, the formulation added with the Brazilian berry extract improved the skin microrelief, honeycomb pattern of the epidermis, and skin hydration in deeper layers of the epidermis.


Assuntos
Cosméticos , Frutas , Gomas Vegetais , Humanos , Brasil , Epiderme/fisiologia , Pele , Água
2.
Foods ; 9(8)2020 Aug 13.
Artigo em Inglês | MEDLINE | ID: mdl-32823508

RESUMO

Rosemary, an aromatic herb with significant antioxidative activity, is frequently used as food preservative and a source of nutraceuticals. Its antioxidant effect is mainly related to the presence of phenolic compounds, molecules considerably unstable and prone to irreversible physicochemical changes when exposed to external agents. We here proposed the loading of rosemary into structured lipid systems to improve its physicochemical properties. Four formulations were prepared using the same amount of rosemary lyophilized extract. The lipid phase was composed of stearic acid and oleic acid, and the aqueous phase, a varying combination of drying carriers (whey protein concentrate or gum Arabic) and surfactant (Poloxamer 188). The formulations were sonicated, spray-dried, and the obtained powders were characterized regarding the density (0.18 g/mL to 0.26 g/mL), particle size distribution (7 µm and 52 µm), and water solubility (29% to 48%). The antioxidant activity was determined by applying ABTS•+ radical-scavenging assay and the results expressed per gram of lyophilized extract (150.6 µmol Trolox/g to 376.4 µmol Trolox/g), with a significantly lower/higher result seen for formulations containing gum Arabic and a higher concentration of Poloxamer. The prepared systems may have potential applications as preservative in foodstuff and as nutraceutical.

3.
Biomolecules ; 10(5)2020 04 29.
Artigo em Inglês | MEDLINE | ID: mdl-32365717

RESUMO

Essential oils (EOs) are widely used in various industrial sectors but can present several instability problems when exposed to environmental factors. Encapsulation technologies are effective solutions to improve EOs properties and stability. Currently, the encapsulation in lipid nanoparticles has received significant attention, due to the several recognized advantages over conventional systems. The study aimed to investigate the influence of the lipid matrix composition and spray-drying process on the physicochemical properties of the lipid-based nanoparticles loaded with Lippia sidoides EO and their retention efficiency for the oil. The obtained spray-dried products were characterized by determination of flow properties (Carr Index: from 25.0% to 47.93%, and Hausner ratio: from 1.25 to 1.38), moisture (from 3.78% to 5.20%), water activity (<0.5), and powder morphology. Zeta potential, mean particle size and polydispersity index, of the redispersed dried product, fell between -25.9 mV and -30.9 mV, 525.3 nm and 1143 nm, and 0.425 and 0.652, respectively; showing slight differences with the results obtained prior to spray-drying (from -16.4 mV to -31.6 mV; 147 nm to 1531 nm; and 0.459 to 0.729). Thymol retention in the dried products was significantly lower than the values determined for the liquid formulations and was affected by the drying of nanoparticles.


Assuntos
Lipossomos/química , Lippia/química , Nanopartículas/química , Óleos Voláteis/química , Secagem por Atomização , Óleos Voláteis/administração & dosagem , Timol/química
4.
Eur Endod J ; 3(1): 2-8, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-32161849

RESUMO

Could conventional endodontic treatment have an impact on oral health-related quality of life? There are still unresolved questions regarding this theme. In order to answer them, a systematic review on the available literature was undertaken to identify the methodological quality of and the risk of bias in all relevant studies. A broad search for articles was conducted, and only articles published before May 2016 were considered for review. The following portals were used: Pubmed, VHL (Medline, SciELO, Lilacs and BBO), Cochrane Library, and Web of Science. The keywords used for the search were 'quality of life' and 'root canal treatment.' Furthermore, we included MeSH synonyms, related terms and free terms. Articles written in any language were included according to the PICOS approach (population, intervention, comparison, outcome and study design). After application of these eligibility criteria, selected articles were qualified by assessing their methodological quality and potential risk of bias. The initial search identified 302 references. After excluding duplicated abstracts and analysing the titles and abstracts, 6 were selected. One study was added via manual search of the reference lists. From these, 2 were eligible for quality assessment and were classified as being of high methodological quality and as having low risk of bias. Based on these studies, it can be concluded that conventional endodontic treatment improves oral health-related quality of life. However, these results should be interpreted with caution, due to the lack of important methodological details in the included studies. Additional investigations are warranted to provide more evidence on this subject.

5.
Pharm Dev Technol ; 23(10): 1047-1056, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28368215

RESUMO

Clove is an aromatic plant spice with potent antioxidant and anti-inflammatory activity. Eugenol is the main compound which contributes to such medicinal and nutritional benefits. To date, the formulation of unstable, volatile and poorly water-soluble compounds remains a challenging task. Lipid formulations can be used to improve physicochemical and biopharmaceutical properties of poorly soluble compounds. The aim of this study is to investigate the effects of lipids, such as Gelucire and Compritol on physicochemical properties; stability and in vitro intestinal permeation of spray dried powdered formulations loaded with clove's bioactive compounds. Results showed that eugenol retention in spray-dried powders could be correlated with antioxidant activity and with mass recovery after spray drying. Adding Gelucire but not Compritol to clove extract formulations, improved solubility of spray dried powders. Stability test in high humidity environment (63.5% RH) suggested that formulations including both Gelucire and Compritol were significantly more stable compared to the formulation without any lipid at the two tested temperatures (25 °C and 40 °C). This suggests that lipid additions to clove (Syzygium aromaticum) extract formulations provide protective effects for the spray dried powders in high-humidity environments. In addition, results from in vitro intestinal permeation studies suggested that eugenol uptake, was not being hindered by transporters nor was the absorption being affected by lipid formulations.


Assuntos
Gorduras/química , Gorduras/farmacocinética , Absorção Gastrointestinal/efeitos dos fármacos , Óleos/química , Óleos/farmacocinética , Extratos Vegetais/química , Extratos Vegetais/farmacocinética , Syzygium , Células CACO-2 , Fenômenos Químicos/efeitos dos fármacos , Composição de Medicamentos/métodos , Estabilidade de Medicamentos , Armazenamento de Medicamentos/normas , Excipientes/química , Excipientes/farmacocinética , Humanos , Componentes Aéreos da Planta , Extratos Vegetais/isolamento & purificação , Pós
6.
J Liposome Res ; 27(1): 11-20, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26872795

RESUMO

In this work, spray-dried lipid systems based on soy phosphatidylcholine, cholesterol and lauroyl polyoxylglycerides for entrapping Green tea polyphenols were produced. The aim was to study the effects of the encapsulating composition and spray drying conditions on the system performance and physicochemical product properties. The spray dryer powder production yield falls around 50.7 ± 2.8%, which is typical for lab scale spray dryers. Wrinkled and rounded particles, with low surface porosities were generated, independent of the drying carriers (trehalose or lactose) used. The product showed high encapsulation efficiency of Green tea polyphenols, which was promptly redispersible in water. It presented low density, and good compressive and flow properties. The results herein reported confirm the feasibility of the entrapment of Green tea polyphenols in lipid-based compositions by spray drying in presence of the drying carriers evaluated. The spray-dried microparticles show high potential to be used as additive in food, nutraceutical and pharmaceutical products.


Assuntos
Camellia sinensis/química , Lipídeos/química , Polifenóis/química , Liofilização , Tamanho da Partícula , Polifenóis/isolamento & purificação
9.
Curr Protein Pept Sci ; 16(3): 219-27, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25707473

RESUMO

Cassava (Manihot esculenta Crantz) belongs to the Euphorbiaceae family and is originated from the Southern Amazon basin. The storage root is the most important product of cassava as food for more than 800 million people in Africa, Asia and Latin America. In this review, we present a retrospective of studies aiming the identification of cassava proteins, starting from the first investigations using SDS-PAGE and classical two-dimensional gel electrophoresis (2DE) to recent studies with advanced technologies such as high-resolution 2DE, mass spectrometry, and iTRAQ-based analysis that have contributed for characterization of cassava proteome. Several cassava proteins have been identified, including those involved in the storage root formation and post-harvest physiological deterioration processes.


Assuntos
Manihot/metabolismo , Proteínas de Plantas/metabolismo , Proteômica/métodos , Bases de Dados de Proteínas , Regulação da Expressão Gênica de Plantas , Manihot/genética , Manihot/crescimento & desenvolvimento , Proteínas de Plantas/genética , Poliploidia
10.
Dev Comp Immunol ; 42(2): 294-301, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24120975

RESUMO

Infectious diseases represent the most serious threat to shrimp farming worldwide. Understanding the molecular mechanisms driving shrimp-pathogen interactions is necessary for developing strategies to control disease outbreaks in shrimp production systems. In the current study, we experimentally reproduced mortality events using standardized infections to characterize the hemocyte transcriptome response of the shrimp Litopenaeus vannamei succumbing to infectious diseases. By using a high-throughput microfluidic RT-qPCR approach, we identified molecular signatures in shrimp during lethal infections caused by the White Spot Syndrome Virus (WSSV) or the filamentous fungus Fusarium solani. We successfully identified gene expression signatures shared by both infections but also pathogen-specific gene responses. Interestingly, whereas lethal WSSV infection induced the expression of antiviral-related genes, the transcript abundance of many antimicrobial effectors was reduced by lethal F. solani infection. To our knowledge, this is the first report of the immune-gene repertoire of infected shrimp at the brink of death.


Assuntos
Hemócitos/imunologia , Penaeidae/imunologia , Penaeidae/microbiologia , Animais , Fusarium/imunologia , Perfilação da Expressão Gênica , Penaeidae/genética , Vírus da Síndrome da Mancha Branca 1/imunologia
11.
Rev. bras. farmacogn ; 23(1): 28-35, Jan.-Feb. 2013. ilus, tab
Artigo em Inglês | LILACS | ID: lil-666166

RESUMO

The total flavonoid content (TFC), total polyphenols content (TPC), and in vitro antioxidant activity (AA) of six Bidens pilosa L., Asteraceae, populations harvested from different localities were evaluated in this work. The plants were separated in roots, stems, and leaves/flowers, and the influence of extraction methods was investigated.Areversed-phase high-performance liquid chromatography method (HPLC) was developed and employed to obtain characteristic HPLC fingerprints of the bioactive compounds present in the extractive solutions, which were correlated with the TFC, TPC, and AA. Extractive solutions of leaves/flowers presented a higher AA when compared with those obtained from other parts of the plant (IC50 of 35.35±0.10 µg/mL). The stem extracts presented the lowest AA (IC50 117.2±1.96 µg/mL). A direct correlation of AA with TFC and TPC was evidenced. The highest AA was obtained by dynamic maceration and was statistically different from the AA presented by the extractive solutions obtained by other extraction methods. The results of this work evidenced differences that can be found at different stages of development of phytopharmaceutical preparations from B. pilosa and highlighted the importance of using the concentration of marker compounds as well as HPLC fingerprints as quality control parameters.

12.
Antonie Van Leeuwenhoek ; 99(2): 249-55, 2011 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-20623188

RESUMO

Clostridium difficile is an important nosocomial enteric pathogen and is the etiological agent of pseudomembranous colites. Recently, the rates of C. difficile infection (CDI) have increased worldwide, but in Brazil few data about this situation and the incidence of clonal types of C. difficile exist. This study aimed to isolate and characterize C. difficile strains from samples obtained of a university hospital (HUCFF) in Rio de Janeiro city, Brazil. CDI was identified by ELISA in 27.1% of HUCFF-in-patients enrolled in the study, and the bacterium was recovered from eight of these fecal samples. All strains, except one, presented tcdA and tcdB genes and presented neither the cdtA and cdtB genes nor any significant deletions in the tcdC gene. All strains were sensitive to metronidazole, vancomycin and moxifloxacin, and resistant to clindamycin, ciprofloxacin and levofloxacin. PCR-ribotyping and PFGE revealed four different clonal types among the isolates. The Brazilian PCR-ribotype 133 accounted for 50% of strains isolated, and PCR-ribotype 233 strains were obtained from 25% of the in-patients. The prevalence and resurgence of the Brazilian PCR-ribotype 133 among the hospitalized patients of HUCFF was established, and cross-infection of different patients associated to the same PCR-ribotypes was detected. Our results emphasize the importance of the diagnosis and control of CDI in order to prevent the emergence of specific clones that can lead to C. difficile-associated outbreaks in Brazilian hospitals.


Assuntos
Técnicas de Tipagem Bacteriana , Clostridioides difficile/classificação , Clostridioides difficile/isolamento & purificação , Infecções por Clostridium/epidemiologia , Infecção Hospitalar/epidemiologia , Ribotipagem , Adulto , Idoso , Antibacterianos/farmacologia , Proteínas de Bactérias/genética , Toxinas Bacterianas/genética , Brasil/epidemiologia , Clostridioides difficile/genética , Infecções por Clostridium/microbiologia , Análise por Conglomerados , Infecção Hospitalar/microbiologia , Impressões Digitais de DNA , Farmacorresistência Bacteriana , Eletroforese em Gel de Campo Pulsado , Enterotoxinas/genética , Feminino , Genótipo , Hospitais Universitários , Humanos , Masculino , Pessoa de Meia-Idade , Epidemiologia Molecular , Ribotipagem/métodos
13.
Microb Drug Resist ; 10(4): 313-20, 2004.
Artigo em Inglês | MEDLINE | ID: mdl-15650376

RESUMO

We investigated the occurrence and phenotypic and genotypic characteristics of erythromycin-resistant Streptococcus pneumoniae strains isolated in three major states in Brazil, from 1990 to 1999. Of the 931 pneumococcal strains evaluated, 40 (4.3%) were erythromycin-resistant (Ery-R). Among the 40 Ery-R strains, 90.0%, 80.0%, 27.5%, 5.0%, and 2.5% were resistant to tetracycline, trimethoprim-sulfamethoxazole, penicillin, chloramphenicol, and rifampin, respectively. None of the strains were resistant to ofloxacin or to vancomycin. Most [37 (92.5%)] of the 40 Ery-R isolates presented the MLS(B) phenotype and 3 (7.5%) strains showed the M phenotype. PCR testing indicated that all MLS(B) phenotype isolates harbored the erm(B) gene only, whereas the mef(A/E) gene was present in all isolates presenting the M phenotype. The tet(M) gene was the most frequent (86.1%) among Ery-R isolates that were also resistant to tetracycline. Pulsed-field gel electrophoresis (PFGE) analysis after SmaI digestion revealed the occurrence of clonal relationships within groups of strains belonging to serotypes 14, 19A, and 23F. All Ery-R isolates belonging to serotype 14 were susceptible to penicillin and were included in a single clonal group (named Ery(14)-A) related to the England(14-)9 internationally spread clone.


Assuntos
Farmacorresistência Bacteriana/genética , Eritromicina/farmacologia , Streptococcus pneumoniae/efeitos dos fármacos , Brasil , Humanos , Testes de Sensibilidade Microbiana , Filogenia , Streptococcus pneumoniae/classificação , Streptococcus pneumoniae/genética
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA