20928
Incorporation of a defined number ( ten ) of quaternary ammonium cationic charges per C60 in 1 was aimed to enhance its ability to target pathogenic Gram - positive and Gram - negative bacterial cells .
 Chemical: quaternary ammonium; Chemical: C60
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: quaternary ammonium; Chemical: C60