19497
The results showed that the mean particle size , zeta potential , pH value , osmolality , drug loading ( DL ) % and entrapment efficiency ( EE ) % of HK - SLEs were 186 . 6 + / - 1 . 7 nm , - 35 . 65 + / - 0 . 67 mV , 7 . 22 + / - 0 . 26 , 298 + / - 2 . 3 mOsm / L , 7 . 1 + / - 0 . 2 % and 95 . 5 + / - 0 . 2 % , respectively .
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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:
 None