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The high purity , molecular weight and correct compositions of each new polypeptide have been confirmed via high performance liquid chromatography ( HPLC ) , sodium dodecyl sulfate polyacrylamide gel electrophoresis ( SDS - PAGE ) , matrix - assisted laser desorption / ionization mass spectrometry ( MALDI - MS ) , and amino acid analysis .
 Chemical: sodium dodecyl sulfate polyacrylamide gel; Chemical: SDS; Chemical: amino acid
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 dodecyl sulfate polyacrylamide gel; Chemical: SDS; Chemical: amino acid