文章基本信息

标题：Production of an environmentally friendly, pressed composite material from straw using biological binders developed from modified residual beer yeast and spent microbial culture media containing the polysaccharide levan
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作者：N.V. Novokuptsev ; N.V. Novokuptsev ; D.A. Kadimaliev 等
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2018
卷号：9
期号：9
页码：2539-2548
出版社：University of Mohammed Premier Oujda
摘要：This study shows the possibility of producing compressed biocomposite materials madefrom pressed straw without the use of phenol-formaldehyde resins. We used a biologicalbinder consisting of modified residual beer yeast and spent culture media containing amicrobial levan polysaccharide, which was obtained from an Azotobacter vinelandiiculture. The physical and mechanical properties of the pressed straw depended on thetype of biobinder used as well as on the conditions surrounding the preparation of thestraw and the biocomposite material pressing. Removal of the fat-wax shell from thestraw improved the characteristics of the material. Pressed materials obtained using thespent culture media as a biological binder were more water-resistant than materialsobtained using modified residual beer yeast. Swelling, as measured by thickness, was38% and 62% using the former and latter biobinders, respectively. The ultimate bendingstrengths of the pressed materials prepared using the modified residual beer yeast andspent culture media were 13.7 and 13.9 MPa, respectively. The addition of paraffin tothe biological binder mixtures prior to pressing improved the water resistance of thepressed materials but reduced the ultimate bending strength. The addition ofglutaraldehyde to the modified residual beer yeast improved the water resistance of theresulting biocomposite materials and did not affect its ultimate bending strength. Allsamples did not emit methanol or phenol, but there was emission of ammonia andformaldehyde at concentrations that did not exceed the threshold limit value. Obtainedbiocomposites could be used as the materials with heat-insulating properties.
关键词：Biomass of yeast;Bacteria Azotobacter;vinelandii;Levan;Straw;Pressed material