I want to do fecal tryptophan measurement, asides from the previous histidine measurement.  What spectrometer or test would you recommend from the following for that purpose?

1) TriVersa NanoMate (this is worth about 7k) 

2) TSQ Quantum Access MAX Triple Stage Quadrupole Mass Spectrometer (havent found how much this is worth)

3) Model WGH - 30/30A Double-beam Infrared Scanning Spectrophotometer (this is worth about (30k) 

Havent found what would be best for the test and the actual cost of the device.  IF someone could help with that information.