19327
Our new NCs have well - controlled physicochemical properties , including high drug loading , quantitative drug loading efficiency , controlled particle size with narrow particle size distribution , and sustained drug release profile over days without " burst " release effect as observed in conventional polymer / drug encapsulates .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None