7308
A simple , colorimetric , sensitive , cost - effective and high - throughput system based on a positively charged graphene oxide - enzyme complex was developed for bacterial detection and drug screening .
 Chemical: graphene oxide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: graphene oxide