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This paper describes a novel electrochemical method for the determination of Sudan I in food samples based on the electrochemical catalytic activity of graphene modified glassy carbon electrode ( GMGCE ) and the enhancement effect of an anionic surfactant : sodium dodecyl sulphonate ( SDS ) .
 Chemical: Sudan I; Chemical: graphene; Chemical: carbon; Chemical: sodium dodecyl sulphonate; Chemical: SDS
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: Sudan I; Chemical: graphene; Chemical: carbon; Chemical: sodium dodecyl sulphonate; Chemical: SDS