26000
Hydrogel microspheres , e . g . for the use as protein carriers , can be prepared without the use of organic solvents via an emulsified aqueous two - phase system ( ATPS ) that is based on two immiscible polymer solutions .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None