13191
Materials and methods : PLGA nanoparticles ( NPs ) were prepared by the solvent emulsification diffusion - evaporation technique and characterized for particle size , particle - size distribution , zeta potential , entrapment efficiency , drug loading and interaction studies and in vivo studies using gamma scintigraphy techniques .
 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: PLGA