Biosuperabsorbent from proteins

University essay from Högskolan i Borås/Institutionen Ingenjörshögskolan; Högskolan i Borås/Institutionen Ingenjörshögskolan

Abstract: The present work is synthesizing novel protein-based superabsorbent hydrogels from albumin protein (AP) and isolated zygomycetes protein (IZP) via modification with an acylating reagent and a bifunctional crosslinker, also investigation on their swelling behaviors under some conditions. The hydrophilic acylating reagent was introduced into albumin and zygomycetes proteins and hydrophylicity of albumin and isolated zygomycetes protein were increased by ethylenediaminetetraacetic dianhydride (EDTAD). Provided protein hydrogels through this method include modification of lysyl residues in the unfolded proteins via adding of one or more hydrophilic carboxyl groups. The reaction was developed with a dialdehyde crosslinking reagent (glutaraldehyde) in order to stabilize the modified protein configuration. The maximum capacity of EDTAD-AP hydrogel swelling was observed 296 g water per g of dry gel, and for EDTAD-IZP hydrogel was 87 g water per g of dry gel.In this study, effect of selected physical and chemical parameters such as protein structure, extent of modification, protein concentration, various pH, ionic strength, gel particle size, temperature as important factors affecting the water uptake behavior of superabsorbent hydrogel were investigated. In addition, the effect of some organic solvents particularly absolute ethanol for increasing the swelling properties was studied.

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