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Appendix C Matrices
C-10 PerSeptive Biosystems
C
2-(4-hydroxy-
phenylazo)-benzoic
acid (HABA)
(see mass
spectrum on
page C-4)
MW 242.07 Da
Applications:
•Proteins
Lipopoly-
saccharides
Polar and
nonpolar
synthetic
polymers
Color of crystals/
solution:
Orange
~1.3 mg/ml in
50:50 water/
acetonitrile or in
40:40:20 water/
acetonitrile/
methanol
10 mg/ml in
ethanol or
methanol
243.077
265.059
3-hydroxypicolinic
acid (3-HPA)
(see mass
spectrum on
page C-4)
MW 139.03 Da
Applications:
Oligonucleotides
Color of crystals/
solution:
Light brown
Make 9:1 dilution of
matrix:diammonium
citrate
Matrix—50 mg/ml in
50:50 water/
acetonitrile
Diammonium
citrate—50 mg/ml in
water
96.045
140.035
279.062
235.072
234.064
233.056
191.082
189.066
Matrix Applications/Color
Matrix Solution
Concentration
Characteristic
Matrix Ions
(monoisotopic)
COOH
PB100255
N
OH
N
COOH
PB100257
OH
N
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