Analytical & QC Testing
Analytical testing enquiries with method, sample, matrix, acceptance criteria and report scope confirmed before work begins.
Gross vial mass can include peptide, water, counterions, residual salts and other components. A fit-for-purpose content method and mass-balance interpretation should be agreed for the material before quantitative use.
NHD accepts analytical-service enquiries for method and reporting review. Sample acceptance, test site, method availability, quantity and deliverables are confirmed before quotation.
Why Peptide Content Matters
"Net peptide content" must be interpreted together with the chemical form, water, counterions, residuals and the method used to estimate content.
- Accurate concentration — weigh-and-dissolve calculations can be biased when non-peptide mass is not characterized.
- Reproducibility — normalizing to net peptide makes results comparable across lots and labs.
- Quantitative assays — essential for IC50/EC50, Kd, and any dose-response measurement.
Amino Acid Analysis Method
Amino-acid analysis is one possible quantitative approach. Its suitability, hydrolysis limitations, standards, traceability and calculation model must be confirmed for the analyte.
- Acid hydrolysis — complete breakdown to constituent residues under controlled conditions.
- Quantitation — residue molar ratios confirm composition and yield net peptide content.
- Report — net peptide %, composition table, and calculated content per vial.
Quantified & AQUA Standards
Absolute-quantitation projects require a defined reference material, value assignment, uncertainty and traceability. Availability is reviewed per project.
- AQUA-style standards — amino-acid-analysis-quantified peptides for absolute quantitation.
- Mass balance — cross-checked content for internal-standard accuracy.
Service Specifications
| Parameter | Specification |
|---|---|
| Method | Selected and confirmed for the submitted material |
| Reports | Results, units, method and limitations defined in advance |
| Use cases | Concentration accuracy · quantitative assays |
| Standards | Reference and traceability requirements reviewed per project |
| Pairs with | Identity, water, counterion and residual analysis where relevant |
| Deliverable | Defined in the accepted analytical scope |
Frequently Asked Questions
Isn't the vial weight enough?
No. Gross weight includes water, salts, and counter-ions. Only net peptide content tells you how much peptide you actually have, which is what your concentrations depend on.
How much can content vary?
There is no safe catalog-wide range. Content depends on material form, sequence, purification, water, counterions, residuals and the measurement method.
Can you quantify a peptide I bought elsewhere?
External-sample acceptance, quantity, method suitability and reporting scope must be reviewed before a project is accepted.
Request Content Determination
Submit the material identity, quantity, matrix, intended calculation and reporting requirements for analytical feasibility review. Contact our team to arrange analysis.