The purification solvent that can remain in the cake

Published 24 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
Peptides are purified by reversed-phase chromatography in gradients of acetonitrile and water with trifluoroacetic acid. Lyophilisation removes water and most acetonitrile, but a residue can remain in the cake. Residual solvents are measured by headspace gas chromatography and reported in parts per million; a certificate stating the figure shows the solvent was controlled.

Where it comes from

The fraction collected from the purification column is a solution in acetonitrile and water. Freeze-drying sublimes the water and most of the organic solvent, but acetonitrile can be trapped in the solid matrix, particularly in dense regions of the cake. The amount depends on the drying cycle.

This applies to every reversed-phase-purified peptide, not to GHK-Cu specifically.

How it is measured

The sample is heated in a sealed vial and the gas above it is injected into a gas chromatograph, which separates and quantifies volatile solvents. Results are compared with established limits for each solvent class.

It is a routine method in pharmaceutical analysis and is applied to research material where a supplier chooses to.

Why it is reported

Because the residue is a known compound at a measurable level in the vial, and because it is part of what the gross mass contains. Lot documentation for GHK-Cu can include it on request.

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

Where it comes from?

The fraction collected from the purification column is a solution in acetonitrile and water. Freeze-drying sublimes the water and most of the organic solvent, but acetonitrile can be trapped in the solid matrix, particularly in dense regions of the cake. The amount depends on the drying cycle.

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

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