22955
A heparin / chitosan mass ratio of 1 : 1 with pH 5 . 20 was the most appropriate for preparation of small , homogenous and stable nanocomplexes ( mean diameter 123nm ; polydispersity index 0 . 22 and zeta potential + 35 . 5mV ) .
 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