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Protein Protocols Protein Protocols

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<strong>Protein</strong> Mutations by MS 683<br />

proteins and peptides. Adducts also unnecessarily complicate mass spectra. To prevent<br />

this, RP-LC is recommended as the final step of sample preparation prior to MS, and<br />

volatile buffers are preferably chosen for the enzymatic cleavage prior to peptide mass<br />

mapping. RP-LC is also a convenient method for estimating the amount of the sample<br />

prepared.<br />

1. Separation conditions: Flow rate 1 mL/min; temperature ambient.<br />

2. Buffer system and gradient condition: A solution of 0.1% TFA and 30% acetonitrile to a<br />

solution of 0.1% TFA in 50% acetonitrile using a linear gradient for 45 min.<br />

3. Detection: UV absorbance at 220 nm.<br />

4. Collection in Eppendorf tubes and recovery by lyophilization.<br />

5. Sample loading:

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