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Insights on physicochemical aspects of chitosan dispersion in aqueous solutions...
Soares, Lucas de Souza; Perim, Rayza Badiani; Alvarenga, Elson Santiago de; Guimarães, Luciano de Moura; Teixeira, Alvaro Vianna Novaes de CarvalhoChitosan is a polysaccharide well-known for its applicability as a biocompatible, biodegradable, and non-toxic material to produce drugs excipients and food coatings. Acidic media are required to disperse chitosan, and aqueous solutions of acetic acid have been typically used for this purpose. However, this acid has several sensory drawbacks. In this study, chitosan was dispersed [0.1 g·(100 mL)−1] in aqueous m...
Rheological properties of aqueous dispersions of xanthan gum containing differe...
Galván, Zoila Rosa Nieto; Soares, Lucas de Souza; Medeiros, Eber Antonio Alves; Soares, Nilda de Fátima Ferreira; Ramos, Afonso MotaXanthan gum (XG) is one of the most effective thickener agents used worldwide. In foods products, one of the factors affecting its physical properties is the ionic strength of the medium. Though it is well known that XG rheological properties in aqueous media depend on both type and concentration of electrolytes, correlations between such dispersion properties and molecular aspects of dispersed XG chains are st...
Rheological and physicochemical studies on emulsions formulated with chitosan p...
Soares, Lucas de Souza; Faria, Janaína Teles de; Amorim, Matheus Lopes; Araújo, João Marcos de; Minim, Luis Antonio; Coimbra, Jane Sélia dos ReisChitosan, a natural, cationic polysaccharide, may be a hydrocolloid strategic to formulate acidic food products, as it can act as both bio-functional and technofunctional constituent. Typically, acetic acid is used to disperse chitosan in aqueous media, but the use of this acid is limited in food formulations due to its flavor. In this study, chitosan was firstly dispersed (0.1% m/V) in lactic acid aqueous solu...
Physicochemical aspects of chitosan dispersibility in acidic aqueous media: eff...
Amorim, Matheus Lopes; Ferreira, Gabriel Max Dias; Soares, Lucas de Souza; Soares, Wanessa Aparecida dos Santos; Ramos, Afonso MotaDifferences in formation of colloidal dispersions of chitosan in aqueous solutions of citric acid or lactic acid (25, 50 or 100 mM) were quantitatively studied. Protonation enthalpies, electrical conductivity and ζ-potential measurements were additionally undertaken, aiming at better understanding these differences at a molecular level. In dispersion kinetics assays, experimental data were well fitted (R2 > 0.9...
Friction factors, convective heat transfer coefficients and the Colburn analogy...
Oliveira, Eduardo Basílio de; Astolfi-Filho, Zailer; Coimbra, Jane Sélia dos Reis; Telis-Romero, JavierSugarcane (Saccharum sp.) is a relatively low-cost agricultural resource, produced mainly in tropical and subtropical regions of the planet. One of the most important applications of sugarcane juice is in the production of ethanol biofuel. A correct design of unit operations during the sugarcane juice processing requires an accurate characterization of the flow properties (friction factors, rheological behaviou...
Acacia gum as modifier of thermal stability, solubility and emulsifying propert...
Oliveira, Fabíola Cristina de; Coimbra, Jane Sélia dos Reis; Oliveira, Eduardo Basílio de; Rodrigues, Marina Quadrio Raposo BrancoProtein–polysaccharide conjugates often display improved techno-functional properties when compared to their individual involved biomolecules. α-Lactalbumin:acacia gum (α-la:AG) conjugates were prepared via Maillard reaction by the dry-heating method. Conjugate formation was confirmed using results of absorbance, o-phthalaldehyde test, sodium dodecyl sulfate–polyacrilamide gel electrophoresis (SDS–PAGE) and siz...
Recovery of casein-derived peptides with in vitro inhibitory activity of angiot...
Souza Jr, Evaldo Cardozo de; Coimbra, Jane Sélia dos Reis; Oliveira, Eduardo Basílio de; Bonomo, Renata Cristina FerreiraPeptides inhibiting the activity of angiotensin converting enzyme (ACE) were obtained by trypsin-catalyzed hydrolysis of bovine milk casein, performed at 37 °C, during 1, 2, 5, 8 and 24 h. Results of in vitro inhibitory activity ranged between 13.4% and 78.5%. The highest ACE inhibitory activity was evidenced for hydrolysates obtained after 2 h of reaction. Aqueous two-phase systems (ATPS) formed by polyethylen...
Formation and characterization of supramolecular structures of β-lactoglobulin ...
Saraiva, Camila Santiago; Coimbra, Jane Sélia dos Reis; Teixeira, Alvaro Vianna Novaes de Carvalho; Oliveira, Eduardo Basílio deCombination of β-lactoglobulin (β-Lg) and lactoferrin (Lf), biomacromolecules derived from bovine whey, was used in the formation of supramolecular structures by thermal gelation technique to adjust the pH. Furthermore, the influence of the molar ratio, temperature, pH, and heating time in the formation of supramolecular structures were also studied. The characterization of the protein supramolecular structures...
Thermophysical and rheological properties of dulce de leche with and without co...
Barbosa, Vanessa Camarinha; Garcia-Rojas, Edwin Elard; Coimbra, Jane Sélia dos Reis; Cipriano, Paula de Aguiar; Oliveira, Eduardo Basílio deDoce de leite é uma sobremesa láctea concentrada (cerca de 70% de sólidos) muito apreciada no Brasil. Propriedades termofísicas e reológicas de duas formulações de doce de leite brasileiro (puro e adicionado de coco ralado a 1,5% em massa) foram determinadas a temperaturas compreendidas entre 28,4 e 76,4 °C. No geral, a presença de flocos de coco não acarretou diferenças significativas (p < 0,05) nestas proprie...
Potential antileukemia effect and structural analyses of SRPK inhibition by N-(...
Siqueira, Raoni Pais; Barbosa, Éverton de Almeida Alves; Polêto, Marcelo Depólo; Righetto, Germanna Lima; Seraphim, Thiago VargasDysregulation of pre-mRNA splicing machinery activity has been related to the biogenesis of several diseases. The serine/arginine-rich protein kinase family (SRPKs) plays a critical role in regulating pre-mRNA splicing events through the extensive phosphorylation of splicing factors from the family of serine/arginine-rich proteins (SR proteins). Previous investigations have described the overexpression of SRPK1...