Figure 7.

(A) PCA of data obtained using different surgical tools on porcine liver in the m/z range of (B) 600–1000 and (B)100–550 in the positive mode, showing a good separation between the Harmonic scalpel and the other instruments. Each point represents a sampling point. (C) Comparison of averaged MS spectra acquired on liver tissue in the positive mode using a Xevo S2-XS instrument (Waters Corporation, UK). Distinctive spectral differences were observed (as they were seen in the negative mode) especially in the range of 800–1000, where high-intensity triglycerides were seen in the Harmonic spectra.