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The efficiency of oral absorption of said drug from such type of formulation depends on many formulation - related parameters , such as surfactant concentration , oil / surfactant ratio , polarity of the emulsion , droplet size and charge , all of which in essence determine the self - emulsification ability .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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