Lot Data · Batch-Specific

Numbers verify the chemistry.

Ask our sales team for the COA matching the offered or supplied lot. It records the tests actually completed, their specifications, and the reported results. Additional Cu²⁺ characterization can be agreed before quotation when the product or buyer procedure requires it.

Cupratec lot-release bench with blue lyophilized copper-peptide vials photographed under the inspection lamp.

Cupratec lot-release bench with copper-peptide vials photographed under the inspection lamp.

Lot-release bench · captured during a production day

Lot Data, Matched by Batch

The numbers verify the chemistry.

A blue powder is not enough to define copper coordination. Ask sales for the COA covering the offered or supplied lot, then agree any additional Cu-specific characterization your formulation or buyer procedure requires.

~606 nm

λmax · Cu(II) d-d band

ΔE < 1.0

Color vs. master lot

6-month

Solution stability data

UV-Vis spectrum can be scoped for λmax position and absorbance at brand-relevant wavelengths.

Cu²⁺ : peptide molar ratio by an agreed suitable method, with method and tolerance defined before testing.

Solution stability + color ΔE, available as a product- and formulation-specific project scope when capability, timing, and cost are confirmed.

View a sample lot report (PDF)Inside the lot-data programme

Cu²⁺ Characterisation · Available Scope

Build the right copper-specific panel.

The methods below describe Cupratec's copper-specific characterization options, not a promise that every listed method appears on every COA. The matching batch certificate states the tests actually performed. Any added method, raw-data package, or reporting requirement is confirmed with sales before quotation.

Test	Method	Target	Why we run it
Cu²⁺ : peptide molar ratio	ICP-MS (Cu) + HPLC-UV (peptide) with internal standard	1.00 ± 0.05 (theoretical 1:1)	The single most important Cu-peptide spec — bioactivity scales with the bound fraction, not the total peptide. Out-of-band lots are held.
Why we run itThe single most important Cu-peptide spec — bioactivity scales with the bound fraction, not the total peptide. Out-of-band lots are held.
UV-Vis · Cu(II) d-d band	200–800 nm scan in chelator-free pure water	λmax ~605–606 nm (physiological pH; broad, condition-dependent) · broad single band	Direct visual + spectral confirmation of intact 3N+O Cu(II) coordination. Shifted or split λmax flags a coordination problem.
Why we run itDirect visual + spectral confirmation of intact 3N+O Cu(II) coordination. Shifted or split λmax flags a coordination problem.
Solution stability (6 months)	25 / 40 / 60 °C across reference and finished-product matrices	Documented decay envelope; release-spec retention ≥ 90% at 6 mo / 25 °C	Lets formulators size shelf-life claims for the active independently of the carrier system; basis for finished-product stability scoping.
Why we run itLets formulators size shelf-life claims for the active independently of the carrier system; basis for finished-product stability scoping.
Color ΔE vs. master lot	CIELab against in-house Cupratec master reference	ΔE < 1.0 (visually indistinguishable)	Catches subtle copper-loading or impurity-profile drift the molar-ratio measurement can absorb but the human eye in a finished product will not.
Why we run itCatches subtle copper-loading or impurity-profile drift the molar-ratio measurement can absorb but the human eye in a finished product will not.

Peptide-Level Analytics

The synthesis side of the chemistry.

Before the copper is coordinated, the peptide has to be characterised against the agreed specification. These methods can support that scope; the applicable batch COA remains the authoritative record of which tests were actually completed.

Test	Method	Target	Why we run it
HPLC purity (peptide)	RP-HPLC at the peptide's UV-active wavelength	≥ 99.0%	Standard purity floor for cosmetic-grade actives. Released lots do not contain peptide-impurity peaks above the integration threshold.
Why we run itStandard purity floor for cosmetic-grade actives. Released lots do not contain peptide-impurity peaks above the integration threshold.
Identity by mass spec	ESI-MS, observed vs. theoretical [M+H]⁺	Confirmed (±0.5 Da)	Sequence confirmation; rules out the synthesis-side failure modes that can hide behind HPLC purity (e.g. truncations at the same retention time).
Why we run itSequence confirmation; rules out the synthesis-side failure modes that can hide behind HPLC purity (e.g. truncations at the same retention time).
Water content (Karl Fischer)	Coulometric KF	≤ 8.0% (lyophilised powder)	Lyophilisation control. Out-of-band water increases the dissociation kinetics of the Cu(II)-peptide complex during long-term storage.
Why we run itLyophilisation control. Out-of-band water increases the dissociation kinetics of the Cu(II)-peptide complex during long-term storage.
Residual solvents	GC headspace	ICH Q3C limits	Synthesis solvent residues; relevant for any peptide active going into a leave-on cosmetic.
Why we run itSynthesis solvent residues; relevant for any peptide active going into a leave-on cosmetic.

Mesotherapy-Grade Lots

For licensed clinical use, only.

For select products and eligible buyers, route-specific testing may be evaluated as a separate commercial and technical scope. Endotoxin or microbial-limit testing is not implied by the standard catalog listing; availability, method, acceptance criteria, and documentation must be agreed before quotation.

These tests are not assumed for a standard cosmetic lot; see the B2B policy for how the qualification works.

Test	Method	Target	Why we run it
Bacterial endotoxin	LAL (gel-clot / kinetic chromogenic)	< 0.25 EU/mg	A route-specific item that must be included in the written scope when required by the buyer's protocol; it is not assumed for a cosmetic lot.
Why we run itA route-specific item that must be included in the written scope when required by the buyer's protocol; it is not assumed for a cosmetic lot.
Microbial limits	USP <61>/<62>	Compliant	For route-specific projects, confirm capability, method, specification, and reporting before quotation; it is not part of every standard lot.
Why we run itFor route-specific projects, confirm capability, method, specification, and reporting before quotation; it is not part of every standard lot.

Lot Report Contents

What lands on your QA bench.

What should a copper-peptide lot release file include?

Ask sales for the COA matching the offered or supplied lot. That certificate records the actual release methods, specifications, and results. The items below are examples of information that may be included or separately scoped, not a fixed bundle promised for every product.

If your dossier requires a specific copper ratio method, UV-Vis trace, stability series, color comparison, raw chromatogram, or independent-laboratory report, list it before quotation. Cupratec will confirm capability, sample needs, timing, and buyer-funded cost unless the written agreement allocates that cost differently.

Cu²⁺ : peptide ratio

Measured value with documented tolerance, ICP-MS / AA traceable.

UV-Vis spectrum

λmax, absorbance at brand-relevant wavelengths, full 200–800 nm trace on request.

Solution-stability series

Decay envelope across 25 / 40 / 60 °C, 6-month timepoints.

Color ΔE

CIELab value against the in-house master lot; photograph available on request.

HPLC purity + identity

Peak-integration chromatogram and ESI-MS confirmation of the peptide molecule.

Lot release statement

Single-page commercial release document signed by QA; the version your buyer-side dossier files.

From the Atelier

Sample a Cupratec lot.

First response under 24 hours. Ask sales for a sample and its matching batch COA, then specify any UV-Vis, Cu²⁺ : peptide ratio, or formulation-feasibility evidence the project requires so availability, timing, and cost can be confirmed.

Test

Method

Target

Cu²⁺ : peptide molar ratio

ICP-MS (Cu) + HPLC-UV (peptide) with internal standard

1.00 ± 0.05 (theoretical 1:1)

Why we run itThe single most important Cu-peptide spec — bioactivity scales with the bound fraction, not the total peptide. Out-of-band lots are held.

UV-Vis · Cu(II) d-d band

200–800 nm scan in chelator-free pure water

λmax ~605–606 nm (physiological pH; broad, condition-dependent) · broad single band

Why we run itDirect visual + spectral confirmation of intact 3N+O Cu(II) coordination. Shifted or split λmax flags a coordination problem.

Solution stability (6 months)

25 / 40 / 60 °C across reference and finished-product matrices

Documented decay envelope; release-spec retention ≥ 90% at 6 mo / 25 °C

Why we run itLets formulators size shelf-life claims for the active independently of the carrier system; basis for finished-product stability scoping.

Color ΔE vs. master lot

CIELab against in-house Cupratec master reference

ΔE < 1.0 (visually indistinguishable)

Why we run itCatches subtle copper-loading or impurity-profile drift the molar-ratio measurement can absorb but the human eye in a finished product will not.

Test

Method

Target

HPLC purity (peptide)

RP-HPLC at the peptide's UV-active wavelength

≥ 99.0%

Why we run itStandard purity floor for cosmetic-grade actives. Released lots do not contain peptide-impurity peaks above the integration threshold.

Identity by mass spec

ESI-MS, observed vs. theoretical [M+H]⁺

Confirmed (±0.5 Da)

Why we run itSequence confirmation; rules out the synthesis-side failure modes that can hide behind HPLC purity (e.g. truncations at the same retention time).

Water content (Karl Fischer)

Coulometric KF

≤ 8.0% (lyophilised powder)

Why we run itLyophilisation control. Out-of-band water increases the dissociation kinetics of the Cu(II)-peptide complex during long-term storage.

Residual solvents

GC headspace

ICH Q3C limits

Why we run itSynthesis solvent residues; relevant for any peptide active going into a leave-on cosmetic.

Test

Method

Target

Bacterial endotoxin

LAL (gel-clot / kinetic chromogenic)

< 0.25 EU/mg

Why we run itA route-specific item that must be included in the written scope when required by the buyer's protocol; it is not assumed for a cosmetic lot.

Microbial limits

USP <61>/<62>

Compliant

Why we run itFor route-specific projects, confirm capability, method, specification, and reporting before quotation; it is not part of every standard lot.