
Chapter 3 Preparing Samples
3-30 PerSeptive Biosystems
3
Handling sample
plates
To prevent contamination of your analysis:
• Start with a clean sample plate. See Section 3.3,
Cleaning Sample Plates, for more information.
• Handle the sample plate by the edges.
• Use powder-free gloves if you wear gloves.
Guidelines for
good
crystallization
To ensure good crystallization:
• Mix sample and matrix before applying. If you are mixing
sample and matrix directly on the sample plate, apply
sample before matrix to prevent matrix from drying.
• If you are using a welled plate, fill the entire well when
loading the sample plate, if possible, especially if
acquiring in Automatic control mode. Surface tension and
sample availability may determine whether you fill the
well completely.
• Do not touch the surface of the sample well with the
pipette tip (may cause uneven crystallization).
Recommended
pipette tips
Use finely-tapered pipette tips to dispense sample/matrix
solution on the sample plate. Tips with blunt ends do not easily
dispense the small volumes used for sample loading.
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