Can I dry digested protein sample over weekend in a vacuum concentrator?
If your sample dried in the speed-vac then it should not cause to much damage to the sample. But if Speed Vac stopped and there was some liquid left, then incubation at room temperature would result in hydrolysis and sample degradation ( also depends on the pH, neutral would be slower). Also you would have modifications to the amino acid side chains like oxidation and deamidation