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 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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