Concentration or concentrations; derivative or derivatives?

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IMBpeter

Member
Chinese
Hi there,

I'm writing a scientific paper, I'm not sure which is right in the following sentences: concentration or concentrations; derivative or derivatives?
Different peptides were tested from initial concentrations of 750 mM or 1.5 mM.

The molecular mass of the peptide was determined by LCMS to be 3022 Da. Reduced, or reduced and alkylated, derivatives of this peptide gained 6 or 348 mass units respectively relative to the native peptide.

Thanks!

Source:My own.
 
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