Bioproducts Research Unit

Albany, CA, United States

Bioproducts Research Unit

Albany, CA, United States
SEARCH FILTERS
Time filter
Source Type

Dominguez-Martinez B.M.,National Polytechnic Institute of Mexico | Martinez-Flores H.E.,Universidad Michoacana de San Nicolás de Hidalgo | Berrios J.D.J.,Healthy Processed Foods Research Unit | Otoni C.G.,Federal University of São Carlos | And 3 more authors.
Journal of Polymers and the Environment | Year: 2016

This study aimed to develop and characterize biodegradable films containing mucilage, chitosan and polyvinyl alcohol (PVA) in different concentrations. The films were prepared by casting on glass plates using glycerol as plasticizer. Mechanical properties, water vapor and oxygen barrier, as well as the interaction with water, were measured. The compatibility of the film-forming components and the uniformity of the films were determined by zeta potential and SEM, respectively. The glycerol and mucilage allowed obtaining more hydrophilic films. The barrier properties of the films made from 100 % chitosan were similar to composed films containing PVA up to 40 %. The results of this study suggest that the interaction between chitosan and mucilage could increase water vapor permeability. The films prepared from either 100 % chitosan or PVA showed a more hydrophobic behavior as compared to the composed films. The films were homogenous since no boundary or separation of components was observed, indicating a good compatibility of the components in the films. © 2016 Springer Science+Business Media New York


Mesquita R.G.D.A.,Federal University of Lavras | Mesquita R.G.D.A.,Copenhagen University | Cesar A.A.D.S.,Federal University of Lavras | Mendes R.F.,Federal University of Lavras | And 4 more authors.
Journal of Polymers and the Environment | Year: 2016

This study aims to evaluate plant fibers that were surface activated with NaOH and corona discharge before incorporating in ortho unsaturated polyester-based fiber composites. It demonstrates the potential use of lignocellulosic particles, especially eucalyptus that presented the higher values for all the mechanical properties analyzed. The corona discharge treatment increased impact strength and tensile strength of the composites, and decreased water absorption. SEM images showed that the surface activation generally improved the interfacial adhesion between fibers and polyester matrix. Corona treatment may depolymerize the lignocellulosic material and smaller fragments may actually help increase the interaction with the polyester. © 2016 Springer Science+Business Media New York


Tonoli G.H.D.,Federal University of Lavras | Tonoli G.H.D.,Bioproducts Research Unit | Holtman K.M.,Bioproducts Research Unit | Glenn G.,Bioproducts Research Unit | And 7 more authors.
Cellulose | Year: 2016

High production costs remain the single greatest factor limiting wider use of cellulose micro/nanofibers by industry. The objective of the present study was to investigate the potential of using a low-cost bacteria-rich digestate (liquid anaerobic digestate—AD-supernatant) on milled eucalyptus fiber followed by high-shear mixing to obtain cellulose micro/nanofibers. The morphology, crystallinity, and thermal stability of micro/nanofibers obtained by this process were studied. The bacteria population in the AD-supernatant was comprised mostly of Bacteroides graminisolvens and Parabacteroides chartae. The digestate treatment partially removed amorphous components of the pulp fiber thereby decreasing micro/nanofiber diameters and enhancing the crystalline content. The treatment also increased the size of the crystalline cellulose. The morphology and crystallinity results demonstrate the effectiveness of digestate treatments coupled with high-shear mixing as a procedure for the production of micro/nanofibers. © 2016 Springer Science+Business Media Dordrecht

Loading Bioproducts Research Unit collaborators
Loading Bioproducts Research Unit collaborators