29216
Based on an orthogonal experimental design L9 ( 3 ( 3 ) ) , polynomial regression models were developed to evaluate correlation between microparticle properties ( encapsulation efficiency and drug release ) and variables ( X1 : weight ratio of polymer to drug , X2 : volume ratio of oil to water and X3 : Q - flow of spray dryer ) .
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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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