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    					A cytoprotective graphene oxide-polyelectrolytes nanoshell for single-cell encapsulation  | 
  					 
  					  										
						Luanying He1, Yulin Chang1, Junhao Zhu1, Ying Bi1, Wenlin An1, Yiyang Dong1, Jia-Hui Liu1,2( ), Shihui Wang1( ) | 
					 
															
						1. College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China 2. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China | 
					 
										
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													     		                            						                            																	    Abstract  Graphene oxide (GO) has been increasingly utilized in the fields of food, biomedicine, environment and other fields because of its benign biocompatible. We encapsulated two kinds of GO with different sizes on yeast cells with the assistance of polyelectrolytes poly (styrene sulfonic acid) sodium salt (PSS) and polyglutamic acid (PGA) (termed as Y@GO). The result does not show a significant difference between the properties of the two types of Y@GO (namely Y@GO1 and Y@GO2). The encapsulation layers are optimized as Yeast/PGA/PSS/PGA/GO/PGA/PSS based on the morphology, dispersity, colony-forming unit, and zeta potential. The encapsulation of GO increases the roughness of the yeast. It is proved that the Y@GO increases the survival time and enhance the activity of yeast cells. The GO shell improves the resistance of yeast cells against pH and salt stresses and extends the storage time of yeast cells. 
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															| Keywords 
																																																				GO  
																		  																																				yeast  
																		  																																				polyelectrolyte  
																		  																																				cytoprotection  
																		  																																				nanomaterials  
																																			  
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																																Corresponding Author(s):
																Jia-Hui Liu,Shihui Wang   
																													     		
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																															Just Accepted Date: 28 June 2020  
																																														Online First Date: 31 July 2020   
																																														Issue Date: 10 March 2021
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