Voyager DP-263-S Guía de usuario Pagina 133

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Preparing Samples
Voyager
Biospectrometry
Workstation User’s Guide 3-3
3
3.1.1 Selecting a Matrix
Purpose of matrix
In MALDI-TOF, the matrix plays a key role in the ionization
process. The well-developed crystals of matrix material assist
in ionizing the molecules you are analyzing.
Common matrices
For most applications, you can use one of the following
matrices:
Procedures for preparing matrix are included in Section 3.1.2,
Preparing Matrix.
Matrix Application
Sinapinic acid (3,5-Dimethoxy-
4-hydroxy cinnamic acid)
Peptides and proteins >10,000 Da
α
-cyano-4-hydroxycinnamic
acid (CHCA)
Dried drop application—Peptides/proteins
<10,000 Da
Thin layer applicationPeptides <~3,000 Da
2,4,6-Trihydroxy acetophenone
(THAP)
Small oligonucleotides < 3,500 Da, acidic
carbohydrates, acidic glycopeptides, acid sensitive
compounds
3-hydroxypicolinic acid (3-
HPA) in ammonium citrate
Large oligonucleotides > 3,500 Da
2,5-dihydroxybenzoic acid
(2,5-DHB)
Peptides, neutral or basic carbohydrates,
glycolipids (negative ions), polar and non-polar
synthetic polymers, small molecules
2,5-dihydroxybenzoicacid and
5-methoxysalicylic acid (DHBs)
Peptides and proteins > 10,000 Da, glycosylated
proteins
Dithranol and Ag TFA Aromatic polymers
trans-3-indoleacrylic acid (IAA) Non-polar polymers
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