8979
A combination of FT - IR , Dynamic Light Scattering ( DLS ) and UV - Vis experiments shows that SL complex the nanoparticle surface via their accessible COOH group thus forming stable colloids , whose hydrodynamic diameter mostly varies between 10 nm and 30 nm , both in water and in KCl - containing ( 0 . 01 M and 2 M ) solutions .
 Chemical: COOH; Chemical: KCl
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: COOH, KCl 
Answer:
 Chemical: COOH; Chemical: KCl