Figure 8.

Typical single-stage MS positive mode ES scans of the lithium adducts of extracted compounds, including the spiked internal standards (IS) of (a) normal rabbit tear extract and (b) dry eye rabbit model tear extract. The internal standards include 3.65 × 10⁻⁵ mg μl⁻¹ monopentadecanoin at m/z 323, 4.35 × 10⁻⁵ mg μl⁻¹ dipentadecanoin at m/z 547, 4.8 × 10⁻⁵ mg μl⁻¹ palmityl behenate at m/z 571 and 5.2 × 10⁻⁵ mg μl⁻¹ triheptadecanoin at m/z 855.