. Author manuscript; available in PMC: 2010 Sep 15.

Published in final edited form as: Anal Chem. 2009 Sep 15;81(18):7618–7624. doi: 10.1021/ac901003u

Table 1.

Limits of detection (LOD) of alcohols in reactive DESI^[a]

Compound	Mass-to-charge ratio(m/z)	Corresponding ions	LOD
Retinol (Vitamin A)	388.3	[M+BA]⁺	0.5 ng
Ergocalciferol (Vitamin D₂)	498.5	[M+BA]⁺	1 ng
Cholecalciferol (Vitamin D₃)	486.4	[M+BA]⁺	2 ng
L-ascorbic acid (Vitamin C)	278.2	[M+BA]⁺	2 ng
Cholesterol	488.5	[M+BA]⁺	0.5 ng
Glucose	282.2	[M+BA]⁺	1 ng
Fructose	282.2	[M+BA]⁺	1 ng

^[a]

Porous PTFE surfaces were used and the spot size interrogated was 300 μm diameter, the spray solvent was ACN/CHCl3 (1:1) with 50 ppm BA.

^[b]

[M+BA]⁺ refers to the hemiacetal shown in Scheme 1.