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Adsorption of lysozyme from aqueous solutions by a novel bentonite–tyrptophane (Bent–Trp) microcomposite affinity sorbent

“…In addition, the endotermic DTA peaks and the bigger mass losses (total mass loss: 9.90 %) attributed to the decomposition of all organic molecule together with structural OH and clay components in the range 200-800 °C for Bent-Trp microcomposite with respect to the bentonite may be interpreted in terms of the penetration of the organic molecule into the interlayer space of clay and replacement of outer sphere water entities by Tyrptophane species [31]. Furthermore, these endothermic DTA peaks of Bent-Trp microcomposite in the temperature range above and the thermal stability of the organic molecule species in the interlamellar space up to 800 ºC signify also the stepwise release of the organic moiety and the presence of π interactions between the oxygen planes of the clay sheet and aromatic ring of the molecule as well as shielding effect of alumina-silicate layers [32][33].…”