24140
The mean nanoparticle size varied from 115 to 274nm , and the encapsulation efficiency ranged from 57 % to 96 % due to drug precipitation induced by different types of polymer .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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