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The efficiency of citrate - buffered and unbuffered method in liquid extraction procedure was compared ; the amount of primary secondary amine ( PSA ) was optimised .
 Chemical: citrate; Chemical: primary secondary amine; Chemical: PSA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: citrate; Chemical: primary secondary amine; Chemical: PSA