Effective adsorption and concentration of carnosine by nickel species within mesoporous silica

• Carboxyl group functionalized mesoporous silica of SBA-15 was synthesized to facilely incorporating Metal Oxide for Car extraction.
• Among these, the adsorption capacity of Car onto Ni50/SBA-15 approached 0.839 mmol (188.4)/g.
• The excellent adsorption characteristics of Ni/SBA-15were preserved in a wide pH window and hardly infected by the background salts.
• The pseudo-second-order rate equation effectively described the uptake kinetics.
• The Langmuir model exhibited a better fit to adsorption isotherm than the Freundlich model.

Carnosine (Car) abundantly exists in meat-derived wastes and has various functions with attractive application as food supplement. Therefore, it is of vital importance to recover Car from the low-value food stuff. Herein, carboxyl group functionalized mesoporous silica of SBA-15 was synthesized to facilely incorporating NiO, ZnO and CoO for Car extraction. Among these, Ni/SBA-15 has the highest adsorption capability. The correlation between the most significant parameters was optimized, and the effects of these parameters on the adsorption efficiency of Car were investigated. Due to the adequate pore size and high Ni loading, the adsorption capacity of Car approached as high as 0.839 mmol/g. The excellent adsorption characteristics of the current adsorbents toward Car were preserved in a commonly used pH window and could be hardly infected by the background salts. The pseudo-second-order rate equation effectively described the uptake kinetics. The Langmuir model exhibited a better fit to adsorption isotherm than the Freundlich model. Therefore, nickel species within functionalized SBA-15 is a kind of efficient materials for recovering histidine-containing peptides from egg-laying hens and makes it a favorable candidate as chromatographic column materials for histidine-containing dipeptides analysis.