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    					Biomineralization-inspired copper-cystine nanoleaves capable of laccase-like catalysis for the colorimetric detection of epinephrine  | 
  					 
  					  										
						Miao Guan1, Mengfan Wang1,3( ), Wei Qi1,2,3, Rongxin Su1,2,3, Zhimin He1 | 
					 
															
						1. School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, China 2. The Co-Innovation Centre of Chemistry and Chemical Engineering of Tianjin, Tianjin 300350, China 3. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300350, China | 
					 
										
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													     		                            						                            																	    Abstract  Recently, many efforts have been dedicated to creating enzyme-mimicking catalysts to replace natural enzymes in practical fields. Inspired by the pathological biomineralization behaviour of L-cystine, in this study, we constructed a laccase-like catalyst through the co-assembly of L-cystine with Cu ions. Structural analysis revealed that the formed catalytic Cu-cystine nanoleaves (Cu-Cys NLs) possess a Cu(I)-Cu(II) electron transfer system similar to that in natural laccase. Reaction kinetic studies demonstrated that the catalyst follows the typical Michaelis-Menten model. Compared with natural laccase, the Cu-Cys NLs exhibit superior stability during long-term incubation under extreme pH, high-temperature or high-salt conditions. Remarkably, the Cu-Cys NLs could be easily recovered and still maintained 76% of their activity after 8 cycles. Finally, this laccase mimic was employed to develop a colorimetric method for epinephrine detection, which achieved a wider linear range (9–455 μmol·L−1) and lower limit of detection (2.7 μmol·L−1). The Cu-Cys NLs also displayed excellent specificity and sensitivity towards epinephrine in a test based on urine samples. 
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															| Keywords 
																																																				biomineralization  
																		  																																				laccase  
																		  																																				L-cystine  
																		  																																				colorimetric detection  
																		  																																				enzyme mimic  
																																			  
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																																Corresponding Author(s):
																Mengfan Wang   
																													     		
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																															Just Accepted Date: 14 May 2020  
																																														Online First Date: 13 July 2020   
																																														Issue Date: 10 March 2021
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