1480
It was demonstrated that without photoactivation , TiO ( 2 ) nanoparticles were inert up to 100 mu g / ml .
 Chemical: TiO ( 2 )
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: TiO ( 2 )