
Chapter 5 Optimizing Instrument Settings
5-66 PerSeptive Biosystems
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If you cannot obtain the resolution listed for the mass range of
interest, consider the following possible causes:
• Laser intensity is too high
• Sample oxidized, fresh sample needed
• Sample does not ionize well in the matrix
• Sample is too dilute or too concentrated
• Impurities are suppressing ionization of sample
• There are heterogeneous components in the peak
5.4.3.3 Optimizing Guide Wire Voltage%
Start with the .BIC file in which you optimized Delay Time or
Grid Voltage%.
Use the following Guide Wire% settings to optimize resolution:
NOTE: Decreasing Guide Wire% to these suggested values
may decrease signal-to-noise ratio.
For more
information
For more information, see:
• Section 5.4.4.3, Setting Guide Wire Voltage%
• Section 5.3.4, Understanding Guide Wire Voltage%
Mode Setting
Linear Peptides (<10,000 Da)—0.05%
Proteins—0.1% or higher for best sensitivity
Reflector 0%, or as low as possible
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