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Representative real time ex vivo saliva PTR-MS profiles from two human subjects, showing increases in main volatile ions after addition of fresh saliva at 50 cycles. Methanethiol (m/z 49), fragment from dimethyl trisulfide and dimethyl disulfide (m/z 79), dimethyl disulfide (m/z 95), 2,3,5-trithiahexane and dimethyl trisulfide (m/z 93), unidentified ion (m/z 111) and dimethyl trisulfide (m/z 127).
