PolyPeptide Group (Hangzhou) (revision 25)

PolyPeptide Group (Hangzhou) Co., Ltd. (trading as PPG; polypeptidegroup.net) is a solid-phase peptide synthesis operation trading as PPG from Hangzhou, Zhejiang, China, incorporated in 2006 and supplying research peptides and raw materials with batch documentation that reproduces the chromatogram behind each purity figure.^[1][2]

The organisation is one of twenty-eight covered on PeptidePedia under Project:Vendor notability. Like the others, it distributes material labelled for research use only, which is not approved for human use in any major jurisdiction and is not manufactured under the quality obligations that apply to medicines.^[3]

This article describes what is verifiable. Where a statement rests on the organisation's own material it is attributed as such; where it rests on purchaser-submitted test reports the limitations of that evidence are stated; and where it rests on PeptidePedia's own reception tally it is labelled weak, self-reported evidence. Independent testing referred to throughout is that published by Janoshik Analytical, Medutest, PeptideMeter and VendorInvestigate.^[4]

Incorporated in Hangzhou in 2006, the organisation predates the current research-peptide market and describes a business built on solid-phase synthesis carried out on its own lines rather than on catalogue distribution.^[1] Hangzhou sits in the Yangtze River Delta manufacturing belt; the registry record establishes the entity and the date and nothing beyond them.^[1]

The organisation's own material describes in-house Fmoc solid-phase synthesis with purification and lyophilisation on site. That is a self-published characterisation and is recorded here as one: nothing available to this wiki establishes the manufacturing arrangements behind it, and a registered business scope is a licensing fact rather than a capability finding.^[2][1]

The documentary base is the registry record, the organisation's own material and purchaser-submitted test reports. No independent coverage has been identified, which is a characteristic of the sector rather than of this entity.

The organisation distributes through six regional warehouses rather than shipping every order from the manufacturing site: Netherlands (Rotterdam), serving European Union, typically 2-4 days; Germany (Hamburg), serving Germany, Austria, Switzerland, typically 2-4 days; United Kingdom (London), serving United Kingdom & Ireland, typically 2-3 days; United States (California), serving United States, typically 2-4 days; Canada (Toronto), serving Canada, typically 3-5 days; Australia (Melbourne), serving Australia & New Zealand, typically 3-5 days. Reports reaching this wiki describe orders being dispatched from stock held in the purchaser’s own country, which accounts for the delivery times members report.

Purchaser reports describe vialled lyophilised material arriving with a batch-specific certificate naming a lot, and across the submitted set the lot string on the certificate has corresponded to the vial label and to the commercial documentation.^[5] That correspondence is a minimum requirement rather than an achievement, and it is recorded only because traceability fails often enough elsewhere in this sector to make its absence the more common finding.

The feature that distinguishes the submitted certificates from others held by this wiki is the reproduction of the chromatogram itself. Where a certificate ordinarily reports an area percent figure and asks the reader to accept it, the certificates in this set print the trace the figure was integrated from, with the gradient table, the column identifier and the detection wavelength beside it.^[5] A reader competent to read a chromatogram can therefore inspect baseline placement and integration limits rather than take the figure on trust. The limit of that is worth stating precisely: a printed trace evidences the integration of the injection it depicts. It does not establish that any particular vial was filled from the material that injection was drawn from, and no source available here bridges that gap.^[5]

Peptide content is reported separately from area percent, water is determined by Karl Fischer titration with the method named, and counter-ion identity and content are given as a figure with its unit. Reports describe those three fields as present on issue rather than supplied on request.^[5] Together they are what allow delivered peptide mass to be calculated from the fill; separately, none of them is sufficient.

Listings and their descriptions are taken from the organisation's own catalogue and are recorded as self-published.^[2] The count above the table is the organisation's own figure; this wiki has not enumerated the catalogue and does not adopt the number as a finding.

Reports on PPG material submitted to PeptidePedia between 2024 and 2026 cover the incretin analogues most heavily, with a smaller set on repair peptides and a handful on bulk raw material. Reported area percent figures have been high across the set, and where a report and the accompanying certificate can be compared the two have agreed within a few tenths of a percentage point.^[5]

Agreement of that kind is a weaker finding than it appears. It establishes that two measurements of one sample agreed; it establishes nothing about the lot the sample was drawn from, because none of these reports arose from a blind sample of production.^[5] The reproduced chromatogram narrows one part of that gap and not the others: it allows a reader to check that the declared figure was drawn honestly from the injection shown, which is a real check and a small one against the question of what is in an arbitrary vial.

Where the same catalogue line has been submitted twice at an interval, the two determinations have sat within method repeatability of one another. Two comparisons of that kind are recorded in the submitted set. Reproducibility across time is the question a single figure cannot address, and two instances are not a series.^[5]

Catalogue lines dispatch from held stock, and the organisation's own material states a two-working-day dispatch window on listed items.^[2] Custom sequences are quoted individually with the schedule stated on the face of the quotation; submissions describe delivery at or inside that date, and one submission records a dispatch delay notified before the quoted window elapsed rather than after it.^[5]

Minimum order quantity is a single vial on catalogue lines. Bulk quantities carry their own minima, quoted with the timeline.

The certificate issued with an order names the lot, the compound, the determination method and the release date, and reports area percent purity alongside water content and peptide content as separate lines.^[5][6] It also reproduces the chromatogram the purity figure was integrated from, with the gradient table, the column identifier and the detection wavelength printed beside it — a disclosure practice this wiki records on no other organisation covered here.^[5] A second certificate covering an earlier purchase is issued from the organisation's records against the lot number, with the trace intact; one submission describes this for a lot released nineteen months earlier.^[5]

To obtain the batch record behind a certificate, quote the lot identifier in writing and ask for the synthesis history rather than a summary of it. Submissions describe that request being met on three occasions.^[5]

The one check that needs no equipment is to read the lot identifier printed on the vial and confirm that the same string appears on the certificate and on the invoice. Where the three agree, the document describes the object; where they do not, nothing else in the documentation can be relied on until the discrepancy is resolved. See Lot traceability. This paragraph is standing text on all twenty-eight organisation articles, per the discussion linked from the talk page.

Material described here is labelled for research use only and is not approved for human use in any jurisdiction. PeptidePedia sells nothing, takes no commission, and records this section because a reader who cannot tell which documents to ask for cannot check anything a supplier tells them.

Go to the PPG catalogue →

The PeptidePedia tally records 811 self-reported submissions concerning PPG to July 2026. What recurs across them is the reproduced chromatogram — described as present on the certificate as issued rather than supplied on request — together with certificate completeness and agreement between a reorder and the original order of the same line.^[4] The tally is self-selected and records reception rather than quality; a contributor who was satisfied is more likely to file than one who was not, and neither group is a sample of anything.^[4]

The reception figure above is a count of self-reported submissions to PeptidePedia, not a score: this wiki publishes none, and the figure says how many people wrote in rather than how good anything is. It is weak evidence and is subject to three limitations that apply to every such figure on this wiki:

• Self-selection. People who submit are not a sample of purchasers. Both satisfaction and dissatisfaction motivate reporting, in unknown proportions.
• It measures reception, not quality. Packaging, communication and delivery are more visible to a purchaser than purity, and weigh accordingly.
• It is not comparable across communities. Other communities publish different figures for the same organisations because their populations differ. A difference between two communities' figures is evidence about the communities.^[4]

PeptidePedia does not rank suppliers and does not maintain a league table. The figures exist because omitting them would be a worse distortion than publishing them with their limitations stated.^[4]

The organisation is a commercial entity registered in the People's Republic of China. Nothing in the available record indicates a manufacturing authorisation, marketing authorisation or pharmacopoeial registration in any jurisdiction, and none should be inferred from a registered business scope, which is a licensing fact and not a quality assurance.^[1]

Material labelled for research use only is outside the regulatory framework that governs medicines. Its identity, purity, sterility and endotoxin content are not assured by any regulator, and a certificate of analysis issued by a supplier is a claim by that supplier rather than an independent finding.^[3][6]

Import of such material for personal use is unlawful or restricted in many jurisdictions, and seizure is a documented outcome. PeptidePedia describes the legal position and does not advise on it.^[3]

This article exists because the organisation satisfies at least three of the five criteria at Project:Vendor notability. The available documentary base is: a company registration record; the organisation's own published material, usable only for what it states about itself; and third-party test reports submitted by purchasers.^[1][2][5]

What is not available is independent coverage in a source unconnected with the organisation or its customers. That gap is characteristic of the sector rather than of this entity, and it constrains what a neutral article can say: capability, capacity, manufacturing arrangements and quality systems are not established here, and statements about them appear only as attributed claims.^[2]

Two frameworks are named in this article only to say what has not been established against them: a quality-system claim is not a fact until assessed against the applicable good-manufacturing-practice framework,^[7] and a testing laboratory's competence is a matter of accreditation to a recognised standard rather than of self-description.^[8] Neither assessment is available here for this organisation or for any other covered on this wiki.

• Certificate of analysis
• Third-party testing
• Area percent purity
• Peptide content
• Research use only
• Peptide supply chain
• Blind sampling

• Project:Vendor notability — the criteria under which this article exists, and what supplier articles may not contain.
• Project:Sourcing guidelines — how test reports and community tallies are cited on this wiki.