Topic
SISAL
About: SISAL is a research topic. Over the lifetime, 1878 publications have been published within this topic receiving 55528 citations.
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Patent•
08 May 2013
TL;DR: In this paper, a method for extracting protease from squeezed juice of sisal is presented. But the method is not suitable for the extraction of proteins from raw sisal juice, as it requires coarse residue to be removed.
Abstract: The invention discloses a method for extracting protease from squeezed juice of sisal. The method for extracting protease from squeezed juice of sisal disclosed by the invention comprises the following steps: squeezing juice by squeezing fresh sisal residue to obtain squeezed juice of sisal; filtering by filtering the squeezed juice of sisal and removing coarse residue to obtain a filter liquor without the coarse residue; centrifuging by centrifuging a crude enzyme liquor without coarse residue to obtain a transparent crude enzyme liquor; ultra-filtering and concentrating by ultra-filtering and concentrating the crude enzyme liquor to obtain a concentrated enzyme liquor; precipitating via ammonium sulfate by adding the ammonium sulfate into the concentrated enzyme liquor, salting out the enzyme and precipitating to obtain an enzyme precipitate; centrifuging by centrifuging the enzyme precipitate and collecting a pasty enzyme paste; drying and crushing by drying the enzyme paste and crushing to obtain powdery finished products of protease. The sisal protease extracted by the method for extracting protease from squeezed juice of sisal disclosed by the invention has the advantages of good quality and high purity. The method for extracting protease from squeezed juice of sisal disclosed by the invention has the advantages of simple process, low production cost, high recovery rate, energy conservation, environmental friendliness and the like.
1 citations
TL;DR: In this paper, the assessment of failed RC beams retrofitted by sisal mat polymer composite externally bonded by strips on critical regions (SCR) is presented, where four beams were tested in threepoint bending with two retrofitted after cracking and two as control specimens.
Abstract: Retrofitting deteriorate structures in order to maintain and enhance the load-carrying capacity to upgrade structural components is necessary and has several economic and environmental advantages over demolition and reconstruction. The used of locally available materials, allowing the use of local skills, benefitting to the local economy and being low in cost for retrofitting should have greater priority for researchers in the field of structural engineering. In this paper, the assessment of failed RC beams retrofitted by sisal mat polymer composite externally bonded by strips on critical regions (SCR) is presented. Sisal fiber is one of the most available natural fibers and the eastern part of Africa is one of the biggest producers, so the application of sisal polymer composite as structural retrofitting needs to be investigated. The study focuses on a shear assessment where four beams were tested in threepoint bending with two retrofitted after cracking and two as control specimens. By using strips in critical regions through main cracks, it was found that the sisal mat composite is suitable as raw material and increases the loadcarrying capacity, reduce cracks propagation and modify the failure mode from pure shear to more ductile flexuralshear.
1 citations
TL;DR: In this paper, the authors developed an optimum process to extract cellulose from sisal fiber and study the influence of pretreatment on the structure and property of sisal fibre, which was treated with 3% HNO3 solution at 120°C for 3h and 3% sodium hydroxyl solution at 110 °C for 2h.
Abstract: The goal of this article was to develop an optimum process to extract cellulose from sisal fiber and study the influence of pretreatment on the structure and property of sisal fiber. The sisal fiber was treated with 3% HNO3 solution at 120°C for 3h, then treated with 3% sodium hydroxyl solution at 110 °C for 2h which was the optimum refining condition. The percentage of cellulose reached 97.23% after pretreatment by chemical analysis. The morphology analysis and FTIR analysis proved that hemicellulose and lignin were removed from sisal fiber. The result of XRD indicated that the crystallinity of pretreated fiber declined. The pretreated fiber presented higher thermal stability by TGA.
1 citations
30 Jun 2018
TL;DR: In this article, the availability of different natural fibers and its mechanical properties and also manufacturing of NF (Sisal, Kneaf) reinforced epoxy polymer matrix green composites are discussed.
Abstract: Present scenario, the most of the materials used for diverse applications are alternative materials as composite materials, in this maximum of the researchers are explored invention of natural fiber reinforced green composites because of easy accessibility of natural fibers and treating of natural fibers are simple and renewable, good mechanical properties, cheap and ecofriendly. In this investigation, the availability of different natural fibers and its mechanical properties and also manufacturing of NF (Sisal, Kneaf) reinforced epoxy polymer matrix green composites are discussed. The essential properties required for engineering applications are tested and evaluated. This paper concludes that the manufacturing of Natural Fiber Reinforced Polymer Composite Lamina by hand layup process and the properties are tested as per the ASTM standards. Finally, we concluded that Kneaf fibered reinforced polymer composite has good mechanical properties then the Sisal Fibered Reinforced Composite.
1 citations