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  • 1
    Publication Date: 2021-05-19
    Description: Se elaboraron películas a partir de disoluciones a 3 % (m/v) de quitosana en ácido láctico a 1% (v/v), empleando glicerina, sorbitol o polietilenglicol como plastificante en concentraciones de 0,25 a 0,50 mL/g de quitosana. Se midieron el esfuerzo tensil, elongación, fuerza de ruptura, deformación y el espesor de las películas, con el objetivo de evaluar la influencia de la masa molar y concentración de plastificante sobre sus propiedades mecánicas. Se obtuvieron los modelos matemáticos que relacionan estos factores. Las películas con polietilenglicol, presentaron mayor esfuerzo tensil y fuerza de ruptura normalizada que las plastificadas con glicerina o sorbitol, pero resultaron menos elásticas y deformables, además, mientras mayor fue la concentración de plastificante, más elásticas resultaron las películas y menor fue el esfuerzo necesario para su rup- tura.
    Description: Films were obtained preparing 3% (w/v) chitosan solutions in 1% (v/v) lactic acid using glycerol, sorbitol or polyethylene glycol at 0.25 to 0.50 mL/g of polymer as plasticizers. Film thickness, tensile strength, force at break, deformation and elongation were measured in order to evaluate the effect of molar mass and plasticizers concentration on mechanical properties values. Mathematical models with these factors were proposed. Films with polyethylene glycol had higher tensile strength and normalized force at break than those which glycerol or sorbitol, but less elongation or normalized deformation. In addition, the films were more elastic and with lesser force at break with the increase of plasticizer concentration.
    Description: Published
    Description: plasticizer
    Description: edible film
    Keywords: Chitosan ; Biopolymers ; Elasticity ; Mechanical properties
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 2
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    Nature Publishing Group (NPG)
    Publication Date: 2013-01-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jonietz, Erika -- England -- Nature. 2012 Nov 22;491(7425):S56-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23320288" target="_blank"〉PubMed〈/a〉
    Keywords: Biomechanical Phenomena ; Biophysics/methods ; Cell Communication ; *Cell Physiological Processes ; Drug Resistance, Neoplasm ; Elasticity ; Hardness ; Humans ; Medical Oncology ; *Models, Biological ; Neoplasm Invasiveness ; Neoplasm Metastasis ; Neoplasms/diagnosis/drug therapy/genetics/*pathology ; Rheology ; Tumor Microenvironment ; Viscosity
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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