17317
Fourier transform infrared ( FTIR ) and high performance chromatography - mass spectrometry / mass spectrometry ( HPLC - MS / MS ) using atmospheric pressure chemical ionisation ( APCI ) under both positive and negative ion modes were employed for this purpose .
 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