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In this study we have demonstrated the use of poly ( lactic acid - co - glycolic acid ) ( PLGA ) / collagen biodegradable microparticles formed using water - in - oil - in - water ( W / O / W ) double emulsion method , as a neurotrophic factor delivery vehicle .
 Chemical: poly ( lactic acid - co - glycolic acid ); Chemical: PLGA
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: poly ( lactic acid - co - glycolic acid ); Chemical: PLGA