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The addition of sodium sulphite or sodium dodecyl sulphate also inhibited precipitate formation after freeze - thawing , resulting in no fractionation .
 Chemical: sodium sulphite; Chemical: sodium dodecyl sulphate
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: sodium sulphite; Chemical: sodium dodecyl sulphate