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Then , swelling and degradation ( WP release ) of formulations were investigated in pH 1 . 2 and 7 . 5 buffers and in simulated gastric and intestinal fluids ( SGF , SIF ) and compared to pure ALG and pure WP particle behaviours .
 None
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