
Chapter 3 Preparing Samples
3-14 PerSeptive Biosystems
3
DHBs
Use DHBs for peptides and proteins >10,000 Da, and
glycosylated proteins.
Matrix concentration 10 mg/ml
Additive concentration 10 mg/ml 5-methoxysalicylic acid
Final sample concentration 10 pmol/µl to 100 fmol/µl
Solvents 80% 0.1% TFA in deionized water:20% acetonitrile
(DHB)
+
50: acetonitrile:50% deionized water
(5-methoxysalicylic acid)
Preparation Follow the procedure in “Preparing matrix” on
page 3-5 and combine 9:1 DHB:5-methoxysalicylic
acid solutions. Air dry sample plate after loading
sample and matrix.
Crystals Needle-like crystals arranged in a ring if air-dried
(see Figure 3-3 on page 3-35). No obvious crystals if
vacuum-dried, or if solvent is a fast-drying organic.
Stability Prepare weekly.
Comentarios a estos manuales