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A range of methods was used to quantify the PPI either at low concentration ( interaction parameter ( kD ) obtained from dynamic light scattering , DLS ) or at high concentration ( solution storage modulus ( G ' ) from ultrasonic shear rheology ) .
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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:
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