Technical Support

Net vs Gross Peptide Weight

All Auspep peptides are sold by gross weight (unless quoted otherwise), ie. the weight stated on the vial includes the associated counter-ions and water. For example, if the percentage of peptide is 90% in a 25mg sample, the actual peptide weight is 25mg x 90% = 22.5mg.

If requested, peptides can be packaged according to net peptide weight. The weight stated on the vial will then be exclusive of associated counter-ions and water. For example, if the peptide content determined by Amino Acid analysis is 80% in a 1mg net sample, the gross weight in the vial is 1.25mg.

Purity vs Peptide Content

Do not confuse peptide content with purity. While the purity of a peptide may be 100%, the peptide content will be determined by both the number of counter-ions associated with charged groups (ie. Arg, Lys) and the hydrophobicity of the peptide. This phenomenon is an intrinsic property of synthetic peptides.

Contact us or fill out an enquiry form for further information.

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