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51.
Renata B. Magenis Elane S. Prudêncio Renata D. M. C. Amboni Noel G. Cerqueira Júnior Ricardo V. B. Oliveira Valdir Soldi & Honório D. Benedet 《International Journal of Food Science & Technology》2006,41(5):560-568
Yogurts made with 80% milk retentate (MR) [Volume Reduction Factor (VRF) = 1.5] and 20% cheese whey retentate (WR; VRF = 8.0) (yogurt 1) and yogurts made with 100% MR through ultrafiltration have been evaluated as to flow, texture profile analysis (TPA) and syneresis index. As with MR and WR, their physico‐chemical composition was also determined. The yogurt to which WR had been added showed; less apparent viscosity and greater tixotrophya; less firmness and adhesiveness and greater cohesiveness; higher syneresis index, less protein and mineral content, and greater lipid content in comparison with the yogurt made only with MR. 相似文献
52.
A.M.G. Borges L.O. Benetoli M.A. Licínio V.C. Zoldan M.C. Santos-Silva J. Assreuy A.A. Pasa N.A. Debacher V. Soldi 《Materials science & engineering. C, Materials for biological applications》2013,33(3):1315-1324
The surface properties of biomaterials, such as wettability, polar group distribution, and topography, play important roles in the behavior of cell adhesion and proliferation. Gaseous plasma discharges are among the most common means to modify the surface of a polymer without affecting its properties. Herein, we describe the surface modification of poly(styrene) (PS) and poly(methyl methacrylate) (PMMA) films using atmospheric pressure plasma processing through exposure to a dielectric barrier discharge (DBD). After treatment the film surface showed significant changes from hydrophobic to hydrophilic as the water contact angle decreasing from 95° to 37°. All plasma-treated films developed more hydrophilic surfaces compared to untreated films, although the reasons for the change in the surface properties of PS and PMMA differed, that is, the PS showed chemical changes and in the case of PMMA they were topographical. Excellent adhesion and cell proliferation were observed in all films. In vitro studies employing flow cytometry showed that the proliferation of L929 cells was higher in the film formed by a 1:1 mixture of PS/PMMA, which is consistent with the results of a previous study. These findings suggest better adhesion of L929 onto the 1:1 PS/PMMA modified film, indicating that this system is a new candidate biomaterial for tissue engineering. 相似文献
53.
Development and characterization of wheat gluten microspheres for use in a controlled release system
Larissa Andreani Rodrigo Cercená Betina G.Z. Ramos Valdir Soldi 《Materials science & engineering. C, Materials for biological applications》2009,29(2):524-531
The purpose of this study was the development and characterization of wheat gluten microspheres for use as controlled release devices, and the evaluation of the effect of the addition of poly (ethylene glycol) (PEG). Diltiazem hydrochloride was used as the model drug in the in vitro release essay. The physical–chemical and morphological properties of the microspheres were evaluated, as well as their encapsulation efficiency. Porosity varied with the presence or absence of PEG. The diltiazem encapsulation efficiency was 72.8% and 96.7% for wheat gluten and gluten/PEG 95/05 microspheres, respectively. The DSC and FTIR results indicated interactions between the microparticles and additives used. In the in vitro release tests it was observed that, for all the studied systems, the burst effect occurred in the first 2 h of release and the microspheres prepared with PEG had a faster release rate. In the attempt to elucidate the release mechanism, the systems were treated based on two well known mathematical models: the Higuchi and the power law. It was found that the microsphere release mechanism is not exclusively diffusion-controlled and, probably, the release occurs through a combination of partial diffusion through the swelling matrix and hydrophilic pores. 相似文献
54.
Ana Karina Timbola C. D. Souza C. Soldi M. G. Pizzolatti A. Spinelli 《Journal of Applied Electrochemistry》2007,37(5):617-624
We report the electrochemical oxidation of rutin in acetonitrile-sodium phosphate (4:1 (v/v); pH 2.0) in the presence of p-toluenesulfinic acid. Cyclic voltammetry and controlled potential electrolysis were used to study rutin electro-oxidation
and to prepare the sulfone derivatives. Chromatographic methods were employed to separate the products and IR, 1H NMR, 13C NMR, MS and microanalysis to their characterization. Data from cyclic voltammetry allow the identification of three rutin
oxidation processes in the presence of p-toluenesulfinic acid (E
pI = 0.56 V, E
pII = 0.81 V and E
pIII = 1.32 V). Only the electrode process around peak I was exhaustively studied. The first oxidation step leads to the formation
of the corresponding o-quinone, which participates in a Michael addition reaction with the p-toluenesulfinic acid, forming the 6′(4-methylphenylsulfonyl)rutin and 6′(4-methylphenylsulfonyl)quercetin as majority products. 相似文献
55.
56.
Paulo Henrique de Mello Sant Ana Gilberto De Martino JannuzziSérgio Valdir Bajay 《Energy Policy》2009
For the last 20 years, countless countries have been carrying out structural reforms in the natural gas industry, trying to achieve efficiency and economic rationality with the introduction of competition. The objective of the paper is to present an approach to the development of competition and infrastructure of the Brazilian natural gas industry. This approach is based on a market projection to 2011, on the international experience and on the characteristics of the Brazilian market, infrastructure and regulatory framework. Possible impacts of the proposed measures are also provided. According to the market projection carried out in this paper, in 2011 there will be a possible surplus of natural gas in the country, which includes a dependence diminishing of the Bolivian gas supply. This gas surplus, allied to an upcoming Gas Law and the trade liberalization in the states of São Paulo and Rio de Janeiro, can stimulate the development of competition, if some changes that proposed in this paper are made in the current Gas Bills. The approach proposed herein seeks to stimulate non-discriminatory open access, focused on information transparency and tariff regulation to help the development of infrastructure and competition. 相似文献
57.
Elisa Brasili Valdir Cechinel Filho 《Critical reviews in food science and nutrition》2017,57(7):1328-1339
Cancer is a multi-factorial disease and is a major cause of morbidity and mortality worldwide. Dietary phytochemicals have been used for the treatment of cancer throughout history due to their safety, low toxicity, and general availability. Several studies have been performed to elucidate the effects of dietary phytochemicals on cancer metabolism, and many molecular targets of phytochemicals have been discovered. In spite of remarkable progress, their effects on cancer metabolism have not yet been fully clarified. Recent developments in metabolomics allowed to probe much further the metabolism of cancer, highlighting altered metabolic pathways and offering a new powerful tool to investigate cancer disease. In this review, we discuss the main metabolic alterations of cancer cells and the potentiality of phytochemicals as promising modulators of cancer metabolism. We will focus on the application of nuclear magnetic resonance-based metabolomics on breast and hepatocellular cancer cell lines to evaluate the impact of curcumin and resveratrol on cancer metabolome with the aim to demonstrate the premise of this approach to provide useful information for a better understanding of impact of diet components on cancer disease. 相似文献
58.
da Cruz KS da Silva MA de Freitas O Neves VA 《Journal of the science of food and agriculture》2011,91(11):2006-2012
BACKGROUND: Baru (Dipteryx alata Vog.) is a fruit distributed throughout the Brazilian savanna and contains a seed with a high protein content, whose properties have been rarely explored. The purpose of this study was to characterize this protein, especially by isolation and quantifying its fractions and measuring some of its molecular properties. RESULTS: Baru seeds contain 244 g kg?1 protein on a dry weight basis. Solubility profiles showed a preponderance of globulins. This fraction dominated the seed composition, with 61.7 wt% of the total soluble proteins. Albumins and glutelins accounted for 14 and 3.3 wt%, respectively. SDS‐PAGE resolution of albumin and globulin showed main bands with molecular weights of 84 kDa and 64, 66 and 73 kDa, respectively. The total protein of the flour and the globulin showed values of in vitro digestibility of 85.59% and 90.54%, relative to casein. Total globulin produced only one chromatographic peak, both on Sepharose CL‐6B gel filtration and on DEAE‐cellulose ion‐exchange columns, eluted at a concentration of 0.12 mol L?1 NaCl. CONCLUSION: The baru seed had high protein content with large quantities of storage proteins. The chromatographic and solubility profiles indicate the predominance of a fraction with characteristics of a legumin‐type protein. Copyright © 2011 Society of Chemical Industry 相似文献
59.
Kathryn Ana Bortolini Simão da Silva Luiz Carlos Klein-Junior Sully M. Cruz Armando Cáceres Nara Lins Meira Quintão Franco Delle Monache Valdir Cechinel-Filho 《Food chemistry》2012
Litsea guatemalensis Mez., a native plant of Mexico and Central America, is widely used as a food condiment, in the same manner as Laurus nobilis L. In folk medicine, it is used to treat several diseases such as respiratory and gastrointestinal complaints. We report here the anti-inflammatory and anti-hyperalgesic properties of ethanolic extract and the compound 5,7,3′,4′-tetrahydroxy-isoflavone (3), which was isolated in addition to pinocembrin (1), and scopoletin (2). The results confirm that both the ethanolic extract and Compound 3 showed anti-inflammatory activity, by inhibiting paw oedema induced by carrageenan, and also reduced the influx of leucocytes, particularly neutrophils, to the pleural cavity and consequently anti-hyperalgesic activity, when assessed in the model of persistent pain induced by partial sciatic nerve ligation. 相似文献