
Preparing Samples
Voyager
™
Biospectrometry
™
Workstation User’s Guide 3-7
3
Sinapinic acid
Use sinapinic acid for peptides and proteins >10,000 Da.
Matrix concentration 10 mg/ml
Final sample concentration 0.1–5 pmol/µl
Solvents Acetonitrile, 0.1% TFA in deionized water
Preparation Follow the procedure in “Preparing matrix” on
page 3-5 and combine 700 µl of 0.1% TFA solution
in water, and 300 µl acetonitrile to 10 mg of solid
matrix.
If sample is contaminated with buffer, salt, or
detergent, instead of the proportions listed above,
combine 500 µl 0.1% TFA and 500 µl acetonitrile.
Air dry sample plate after loading sample and matrix.
NOTE: The organic concentration above assumes you are premixing sample
solution:matrix solution in a 1:10 dilution. If you are mixing sample solution:matrix
solution on the plate in a 1:1 dilution, increase the proportion of acetonitrile to
50 percent to prevent the matrix from precipitating. Adjust the other components
accordingly.
NOTE: A higher concentration of TFA (up to 3%) may improve sample solubility.
Crystals Uniform rhomboid shape (see Figure 3-1 on
page 3-34)
Stability Prepare daily.
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