6481
Our results showed that the ultrafiltrate volume was changed from 40 to 400 mu L with the increase of centrifugation time for the traditional UF , and the related changes in unbound concentration were significant .
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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