What a gel shows that a purity percentage does not

Published 24 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
SDS-PAGE separates proteins by apparent molecular weight. One clean band at the expected size supports identity and purity together; extra bands locate the problem — higher for aggregates or host protein, lower for fragments.

What the lane is telling you

Distance travelled reflects apparent molecular weight, so a band's position is a size estimate and its intensity a rough measure of how much is there. For a protein, that picture catches things a single purity figure cannot: where the contamination sits, and whether it is larger or smaller than the target.

A band above the target may be aggregate, dimer or host-cell protein. One below is usually a fragment or a degradation product. Each points somewhere different.

The traps

Apparent molecular weight is not actual molecular weight. Glycosylation, unusual amino acid composition and incomplete denaturation all shift migration, so a band in the "wrong" place is not automatically a wrong protein — and mass spectrometry, not a gel, settles identity.

Loading matters as well: overload a lane and minor bands appear that were always there; underload it and they vanish. A gel without a stated load is as incomplete as a purity figure without its method.

Why it pairs with the certificate

A gel shows where the contamination sits by size; HPLC quantifies; mass spectrometry confirms identity. They answer different questions, which is why certificates for recombinant proteins customarily report more than one.

Lot-specific documentation is available on request. Research use only, no dosing or protocol guidance provided.

What it costs

FormatStrengthPriceAvailability
HGH Somatropin Pack24 mg (72 IU)AED 850In 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

What the lane is telling you?

Distance travelled reflects apparent molecular weight, so a band's position is a size estimate and its intensity a rough measure of how much is there. For a protein, that picture catches things a single purity figure cannot: where the contamination sits, and whether it is larger or smaller than the target.

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.

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

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