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A classical route to peptide content, and its limits for GHK-Cu

Published 24 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
Total nitrogen in a sample, measured by combustion or digestion methods, can be converted to peptide content using the nitrogen fraction of the peptide. GHK is nitrogen-rich — histidine contributes three nitrogens and lysine two beyond the backbone — so its conversion factor is specific to it and cannot be borrowed from a generic protein value. Trifluoroacetate counterion contributes no nitrogen; acetate contributes none; so the method is unaffected by salt form.

The methods

Combustion analysis burns the sample and measures nitrogen gas; digestion methods convert nitrogen to ammonia and titrate it. Both give total nitrogen by mass. Neither distinguishes peptide nitrogen from any other nitrogen-containing impurity.

They are rapid and well established.

The conversion factor

Peptide content equals measured nitrogen divided by the nitrogen fraction of the pure peptide. For GHK, with its imidazole and amine nitrogens, that fraction is higher than for an average protein, and using a generic factor would understate content. The factor is calculated from the sequence.

Copper does not contribute nitrogen and does not interfere.

Where it sits among the methods

A useful cross-check against amino acid analysis and the difference method. Agreement among all three is strong evidence that a stated peptide content is right.

GHK-Cu is supplied by REVIVE LAB UAE for laboratory research use only, with identity by mass spectrometry and purity by HPLC for the batch. It is not for human or veterinary use, and no dosing, administration or protocol guidance is provided.

What it costs

FormatStrengthPriceAvailability
GHK-Cu Pack50 mgAED 425In stock

Delivery is AED 40 flat and free on orders over AED 700. Payment is cash on delivery anywhere in the UAE, or USDT (TRC20) in advance, which takes 5% off the order total.

Frequently asked

The methods?

Combustion analysis burns the sample and measures nitrogen gas; digestion methods convert nitrogen to ammonia and titrate it. Both give total nitrogen by mass. Neither distinguishes peptide nitrogen from any other nitrogen-containing impurity.

Does REVIVE LAB UAE provide dosing guidance?

No. REVIVE LAB UAE supplies research materials and provides no dosing, administration or protocol guidance of any kind. Every product is sold for laboratory research use only and is not for human or veterinary consumption.

How fast is delivery in the UAE?

Stock is held in Dubai. An order confirmed before 4 PM Dubai time is dispatched the same working day, reaching Dubai and Abu Dhabi the same day and the remaining emirates within 24 hours. Delivery is AED 40 flat and free over AED 700.

GHK-Cu Pack — in stock, dispatched from Dubai
HPLC-verified, lot certificate on every carton, 24-hour delivery nationwide. Browse the catalogue → All peptides UAE

Related reading

→ GHK-Cu Pack — 50 mg → Amino acid analysis for peptide content → The sequence Gly-His-Lys

Supplied for laboratory research use only. Not for human or veterinary consumption. REVIVE LAB UAE provides no dosing, administration or protocol guidance.