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Each component of the cyclodextrin - functionalized Fe3O4 @ TiO2 core - shell nanoparticle has a crucial role in its functioning .
 Fe3O4, TiO2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Fe3O4, TiO2