Navegando por Palavras-chave "polysaccharides"

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    Active packaging material based on buriti oil - Mauritia flexuosa L.f. (Arecaceae) incorporated into chitosan films
    (Wiley-Blackwell, 2016) Silva, Mariangela de F.; Lopes, Patricia S. [UNIFESP]; da Silva, Classius F. [UNIFESP]; Yoshida, Cristiana M. P. [UNIFESP]
    Active and biodegradable materials have great potential in food packaging applications, improving the safety and quality of products. The objective of this study was to develop a new material based on buriti oil incorporated into a chitosan film. Different concentrations of buriti oil in dried films (2.1 g/m(2), 10.4 g/m(2), 20.8 g/m(2), and 31.3 g/m(2)) were added into a chitosan matrix (41.7 g/m(2)). The chitosan/buriti oil films were characterized by water-vapor barrier properties, total water-soluble matter (TSM), tensile properties, thermogravimetric analysis, microstructure, microbial permeation properties, and biodegradation estimation. The higher oil concentration improved the water-vapor barrier and the buriti oil acted largely as a plasticizer and increased the elongation at break, and decreased the tensile strength (TS) of chitosan films. The total water-soluble matter of chitosan films decreased in function of the buriti oil concentration, but the biodegradation and thermal stability increased. The chitosan films presented a microbial barrier against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. (C) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43210.
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    The Paracoccidioides cell wall: past and present layers toward understanding interaction with the host
    (Frontiers Research Foundation, 2011-01-01) Puccia, Rosana [UNIFESP]; Vallejo, Milene Carmes [UNIFESP]; Matsuo, Alisson Leonardo [UNIFESP]; Longo, Larissa Valle Guilhen [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    The cell wall of pathogenic fungi plays import roles in the interaction with the host, so that its composition and structure may determine the course of infection. Here we present an overview of the current and past knowledge on the cell wall constituents of Paracoccidioides brasiliensis and P. lutzii. These are temperature-dependent dimorphic fungi that cause paracoccidioidomycosis, a systemic granulomatous, and debilitating disease. Focus is given on cell wall carbohydrate and protein contents, their immune-stimulatory features, adhesion properties, drug target characteristics, and morphological phase specificity. We offer a journey toward the future understanding of the dynamic nature of the cell wall and of the changes that may occur when the fungus infects the human host.