
Chapter 7 PSD Analysis
7-36 PerSeptive Biosystems
7
7.4 Exploring PSD Mode
To be successful in PSD analysis, you need to understand
how ions behave in PSD mode, and how to optimize
acquisition conditions. Before running samples, spend some
time practicing with standards.
In this section, you will observe the effects of:
• Laser intensity on fragment ion production and signal
intensity
• Precursor Ion Selector on prompt fragments
• Grid Voltage% on resolution
This section assumes that you are familiar with the information
in Section 7.3, Acquiring PSD Data with Standard Instrument
Settings (.BIC) Files.
Preparing the
practice standard
To prepare the practice standard:
1. Prepare a 50 pmol/µl solution of angiotensin I.
2. Prepare
α
-cyano-4-hydroxycinnamic acid matrix as
described in Section 3.1.2, Preparing Matrix.
3. Mix 1 µl of angiotensin I with 24 µl of matrix for a final
concentration of 2 pmol/µl.
4. Apply 1 µl of angiotensin/matrix to a sample plate.
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