Pretreatment of peanut shells for co-production of glucose and concrete admixture

Download

index.pdf

Date

2013

Author

Tatlı, Emre

Metadata

Show full item record

Item Usage Stats

232
views

95
downloads

This thesis work aims the ionic liquid pretreatment of peanut shells for co-production of glucose as fermentable sugar and lignin, considering a multi product perspective. The effects of ionic liquid type and pretreatment time period on the sugar and lignin yields were investigated, as the particle size and temperature parameters were determined in the preliminary studies. Peanut shells were pretreated at constant temperature, 150 oC, for 5, 15 and 30 minutes with 1-ethyl-3-methylimidazolium acetate and for 15, 30 and 60 minutes with 1-ethyl-3-methylimidazolium chloride. The pretreated peanut shells were then subjected to enzymatic hydrolysis in order to produce fermentable sugars, mostly, glucose. The solid residue obtained upon enzymatic hydrolysis was analyzed in terms of lignin quantity. 1-ethyl-3-methylimidazolium acetate pretreatment for 15 minutes resulted in the maximum reducing sugar and lignin yields; 28 g of reducing sugar and 20 g of solid residue with 70% lignin were obtained per 100 g of peanut shells. Higher pretreatment time resulted in lower yields. Moreover, no optimal time period for 1-ethyl-3- methylimidazolium chloride pretreatment was obtained, since reducing sugar and lignin yields increased as the time period increased. Also all reducing sugar and lignin yields were lower than that obtained with 1-ethyl-3-methylimidazolium acetate. Lignin obtained upon enzymatic hydrolysis of 1-ethyl-3-methylimidazolium acetate pretreated peanut shells were characterized by SEM, FTIR, TGA and XRD analyses, which also showed the morphological and structural effects of pretreatment and enzymatic hydrolysis on peanut shells; and used as concrete admixture, which increased the flow of the concrete by 6%.

Subject Keywords

Peanuts., Cellulose., Glucose., Enzymes., Lignin., Hydrolases., Biomass.

URI

http://etd.lib.metu.edu.tr/upload/12615535/index.pdf
https://hdl.handle.net/11511/22367

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Studies on interaction of electromagnetic waves with barium hexaferrite ceramics Gürkan, Nurdan; Timuçin, Muharrem; Department of Metallurgical and Materials Engineering (2008) M-type barium hexaferrite powders doped with titanium and/or cobalt have been synthesized according to the stochiometric formulations BaFe(12 (4/3)x)TixO19, BaFe12-xCoxO19 , BaFe12-2xTixCoxO19 (x varying from 0 to 1.5 with an increment of 0.5) by the mixed oxide approach. The powders were used to manufacture small ceramic tiles by sintering each composition at 1250 °C with soaking times ranging from 1 to 16 hours. XRD work revealed formation of the magnetoplumbite crystal structure in all ceramics. The var...
Sample preparation for arsenic, copper, iron, and lead determination in sugar Leblebici, J; Volkan, Mürvet (1998-01-01) Two sample preparation methods were modified and optimized for the determination of As, Cu, Fe, and Pb in white sugar using atomic absorption spectrometry (AAS). Analyses were carried out using hydride generation AAS (HG-AAS) for As and flame AAS (FAAS) for Cu, Fe, and Pb. White sugar samples were prepared by dry ashing of the samples with H2SO4 and Mg(NO3)(2). Recoveries for As, Cu, Fe, and Pb were 87.6, 92.8, 95.8, 91.1% respectively, in ashing with H2SO4 They were 95.1, 92.4, 97.4, and 91.1%, respectivel...
Metabological engineering of Pichia Pastoris for extracellular thermostable glucose isomerase production Ata, Özge; Çalık, Pınar; Özdamar, Tunçer H.; Department of Biotechnology (2012) The aim of this study is to develop a metabolically engineered P. pastoris strain for production of an active extracellular thermostable glucose isomerase (GI) enzyme by using genetic engineering techniques. For this purpose, research program was performed in two sub-programs. In the first sub-program, xylA gene from Thermus thermophilus was amplified and inserted into pPICZα-A expression vector. Thereafter, this pPICZα-A::xylA vector was cloned into AOX1 locus in P. pastoris genome and expressed under alco...
Structural and mechanical investigations of magnesium and fluoride doped nano calcium phosphates Sun, Zehra Pınar; Evis, Zafer; Department of Micro and Nanotechnology (2009) The aim of this study was to investigate the microstructure and mechanical properties of pure and Mg2+ and F- doped nano-calcium phosphate (CaP) powders, which were synthesized by precipitation method. After the drying and calcination processes, the samples were sintered at 1100ºC for 1 hour. High densities were achieved except for the 7.5 % mole Mg doped samples. Microstructure of the CaPs were investigated by X- ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Mi...
Selecting the right blood glucose monitor for the determination of glucose during the enzymatic hydrolysis of corncob pretreated with different methods Bahcegul, Erinc; Tatli, Emre; Haykir, Nazife Isik; Apaydin, Serpil; Bakir, Ufuk (Elsevier BV, 2011-10-01) In order to assess their accuracy for the determination of glucose during the enzymatic hydrolysis of pretreated lignocellulosic biomass, four different blood glucose monitors (BGMs), each utilizing a different enzymatic mechanism for the determination of glucose, were utilized in an experimental setup, which compares the efficiency of ionic liquid pretreatment with dilute acid and alkaline pretreatments applied on corncob. Among the tested devices, Optium Xceed was found to be the most accurate device for ...

Citation Formats

E. Tatlı, “Pretreatment of peanut shells for co-production of glucose and concrete admixture,” M.S. - Master of Science, Middle East Technical University, 2013.