Color formation in wheat starch based glucose syrups and use of activated carbons for sugar decolorizaiton

Çelebi, İpek
Glucose syrups were produced from wheat starch at 45-90 min liquefaction times followed by 18 h saccharification to study the effect of liquefaction time on color formation and the use of several amounts (0.25%-1%) and types (NORIT, commercial; and hazelnut husk, apricot stone, hazelnut shell based; prepared in Chemical Engineering Department) of activated carbons for color removal. The fractional conversion values and color levels of glucose syrups increased with increasing liquefaction time. However, to reduce the color level to 100 ICUMSA units, the smallest amount of all types of activated carbons were required for, the glucose syrups with highest level of original color, which were produced at 90 min liquefaction time. Comparison of the performances of the activated carbons showed that hazelnut husk based one was as good as NORIT, while apricot stone based and hazelnut shell based activated carbons showed similar performances, which were somewhat poorer than that of NORIT and hazelnut shell based activated carbon.


Color formation in wheat starch based glucose syrups and use of commercially available and laboratory-prepared agricultural waste-based activated carbons for decolorization
Celebi, Ipek; Kincal, N. Suzan (Informa UK Limited, 2007-01-01)
Glucose syrups were produced from wheat starch using alpha-amylase at 97 degrees C for 45-90 min liquefaction times, followed by saccharification with amyloglucosidase at 60 degrees C for 18 h to study the color formation. This was followed by decolorization studies using 0.25 to 1.00 g activated carbon per g of syrup of the commercially available NORIT and several activated carbons prepared from apricot stones and hazelnut shells and husks on laboratory scale. Increase in liquefaction time resulted in high...
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In this research, oxidative dehydrogenation of ethane to ethylene was studied over Cr-O and Cr-V-O mixed oxide catalysts through steady-state and dynamic experiments. The catalysts were prepared by the complexation method. By XRD, presence of Cr2O3 phase in Cr-O; and the small Cr2O3 and V2O4 phases of Cr-V-O were revealed. In H2-TPR, both catalysts showed reduction behaviour. From XPS the likely presence of Cr+6 on fresh Cr-O was found. On Cr-V-O, the possible reduction of V+5 and Cr+6 forms of the fresh sa...
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This study investigated the equilibrium sorption capacities and rates of sorption of some alcohols on Na- and/or H- form of ZSM-35 at different temperatures by gravimetric method using an electrobalance. The alcohols studied were methanol, ethanol, propan-1-ol, propan-2-ol, n-butanol. The ZSM-35 sample used in sorption experiments resulted from a study for synthesis of high silica ZSM-35 zeolite. This ZSM-35 sample was called as NaZSM-35. The influence of ion-exchange on the sorption capacity and kinetics w...
Citation Formats
İ. Çelebi, “Color formation in wheat starch based glucose syrups and use of activated carbons for sugar decolorizaiton,” M.S. - Master of Science, Middle East Technical University, 2006.