4392
Descriptive and discriminative sensory and chemical analyses , based on headspace solid phase microextraction followed by gas chromatography - mass spectrometry analysis ( HS - SPME - GC - MS ) , were carried out after 1 , 20 , 40 and 60 days .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None