What is the purpose of the TMTpro Zero Label Reagent?
The TMTpro Zero Label Reagent was designed to be used to optimize methods before multiplexed analysis of samples.
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Can the TMT and TMTpro reagents be mixed?
No, the TMT and TMTpro reagents cannot be mixed because the reporter ions are in the same region.
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Can TMTpro label reagents dissolved in anhydrous acetonitrile be dried down and stored for later use?
Yes, unused TMTpro label reagent that has been dissolved in anhydrous acetonitrile can be aliquoted into tubes, dried under vacuum at 25-30 degrees C, purged with nitrogen, and stored in a sealed bag with desiccant at -20 degrees C.
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At which step should I label my mass spec samples with TMT reagents?
TMT labeling can be performed after reduction, alkylation, digestion, or prior to cleanup, if the sample is buffered at appropriate pH (8-8.5) in a suitable buffer without primary amines (e.g., Tris, glycine). TMT labeling can also be performed after peptide clean-up. Labeling of peptides after clean-up enables measuring and normalizing of the peptide samples for equal mixing.
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Do I have to apply correction factors for analyzing data for TMT/TMTpro-labeled samples?
Applying correction factors is required for more accurate relative protein quantitation as the isotopic impurity is variable among the tags, ranging from 5-10%.
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