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coa

Page 25 of 32 · 749 questions tagged coa.

749 questions · sorted by votes · page 25 of 32

10 votes5 answers9.5k views
Has anyone independently verified a CPC tirzepatide batch COA?

The case in front of me: CPC · tirzepatide. I want to know whether there is evidence behind this or only repetition. I have checked the obvious registries and…

vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
asked by kofi_mensah 12k · 6 months ago
10 votes 4 answers7.7k views
What does 97.9% purity on a C18 column actually tell me about an ecnoglutide vial?

What I am working with: 97.9% · a C18 column · ecnoglutide. I would like help reading this properly rather than being told what conclusion to reach. I have the full…

hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by valentina_rossi 16k · 10 months ago
10 votes 5 answers7.6k views
Has anyone independently verified a QSC a GLP-1 receptor agonist batch COA?

Stated plainly: QSC · a GLP-1 receptor agonist. This has the shape of a fact but I cannot find its origin. What I found instead were three secondary sources all…

vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
asked by threadlock7 14k · 6 months ago
10 votes 5 answers7.3k views
Would you re-test tirzepatide after three weeks at 37 °C, or accept the original certificate?

The specifics, since they change the answer: tirzepatide · three weeks · 37 °C. I am at the decision point and I would rather think it through than improvise. I would…

batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by juan_esquivel 14k · 3 months ago
10 votes 4 answers7k views
What does a 97.1% purity with a batch certificate attached let me conclude?

Setup, so nobody has to ask: 97.1% · batch certificate. I have read the primary source rather than the summary, which has left me with more questions. I understand…

purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by siobhan_deasy 16k · 6 months ago
10 votes 4 answers6.3k views
How do I trace an SGN lot number back to a synthesis date?

This is my second independent submission on material from the same supplier. I would like to understand the steps well enough to explain them to someone else. I have…

batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
asked by eoin_mcgarry 16k · 3 months ago
10 votes5 answers5.1k views
What does a 503A pharmacy need to prepare semaglutide lawfully?

The pharmacy is accredited and I have verified that on the accreditor register. The figures are clear enough; the question is what they mean and what they do not. I…

pharmacy-503a
pharmacy-503a

Section 503A traditional compounding pharmacies specifically: patient-specific prescriptions, accreditation such as PCAB and ACHC, USP 797…

17 questions
compounding
compounding

Compounded preparations: what a 503A and a 503B facility may legally prepare and when, base versus salt forms, beyond-use dating under USP…

61 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by a_lindgren 46k · 11 months ago
10 votes3 answers4.6k views
How many vials from a Homopeptide lot should I send for a sterility test?

Conditions: Homopeptide · a sterility test. Please show the division. I want to check my own against yours. I would like the general form as well as the specific…

batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
cost-analysis
cost-analysis

Cost arithmetic done honestly: cost per milligram after dead-space loss, list versus net price, comparing a multi-dose vial to a fixed-dose pen,…

261 questions
asked by bac_or_bust 37k · 11 months ago
10 votes 3 answers4.6k views
What does a 97.9% purity with a batch certificate attached let me conclude?

Stated plainly: 97.9% · batch certificate. I have read the primary source rather than the summary, which has left me with more questions. I understand the headline. I…

purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by kelvin_lam 11k · 2 months ago
10 votes5 answers2.6k views
How do I reconcile 95.2% from Medutest with 97.1% from the supplier?

Setup, so nobody has to ask: 95.2% · Medutest · 97.1%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not…

purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by mz_4113 99k · 3 months ago
10 votes 2 answers2.3k views
What does Janoshik verification of Qingdao Sigma Chemical actually cover?

What I have: Janoshik · Qingdao Sigma Chemical. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to…

vendor-investigate
vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

41 questions
vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by meniscus_film 34k · 3 months ago
9 votes 5 answers29k views
What does a sterility test add for orforglipron that a purity figure does not?

Details up front: a sterility test · orforglipron. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…

content-assay
content-assay

Quantified content: how many milligrams of peptide are actually in the vial, measured against a calibrated reference standard. A separate test…

438 questions
purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by valentina_rossi 16k · 2.2 years ago
9 votes 5 answers28k views
What does PeptideMeter verification of Hubei Jianxiang Bioscience actually cover?

The particulars: PeptideMeter · Hubei Jianxiang Bioscience. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I am…

vendor-investigate
vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

41 questions
vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by cap_the_luer 15k · 2.1 years ago
9 votes 5 answers18k views
How does BCH compare to Nantong Guangyuan Chemical on documentation quality?

What I am working with: BCH · Nantong Guangyuan Chemical. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…

vendor-comparison
vendor-comparison

Side-by-side comparison of suppliers on measurable axes - independently confirmed purity and content, lead time, cold-chain handling,…

351 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
asked by tri_gly_ala 48k · 13 months ago
9 votes 5 answers16k views
What does 98.8% purity on a C8 column actually tell me about an oral semaglutide vial?

What I have: 98.8% · a C8 column · oral semaglutide. I can parse the result. I am less sure what it licenses me to conclude. I have deliberately not looked at anyone…

hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by Dr_Tomas_Kral 37k · 23 months ago
9 votes5 answers15k views
Has anyone independently verified a GGPeps survodutide batch COA?

For reference: GGPeps · survodutide. I would like to know whether this claim survives contact with evidence. If the answer is "nobody has tested that", I would like…

vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
asked by coldbox9 13k · 20 months ago
9 votes 5 answers13k views
Has anyone independently verified an SSA semaglutide batch COA?

For reference: SSA · semaglutide. I would like to know whether this claim survives contact with evidence. If the answer is "nobody has tested that", I would like that…

vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
asked by Dr_Nadia_Farsi 90k · 18 months ago
9 votes0 answers13k views
Has anyone independently verified a JEEP retatrutide batch COA?

Details up front: JEEP · retatrutide. I would rather be corrected now than propagate something wrong. I am specifically not interested in a testimonial; I am…

vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
asked by Dr_Tomas_Kral 37k · 2.0 years ago
9 votes 4 answers12k views
Would you re-test oral semaglutide after three weeks at minus 80 °C, or accept the original certificate?

The particulars: oral semaglutide · three weeks · minus 80 °C. I am at the decision point and I would rather think it through than improvise. I would rather spend…

batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by Dr_Nadia_Farsi 90k · 2.0 years ago
9 votes 3 answers9.6k views
What does Medutest verification of GL Biochem (Shanghai) actually cover?

What I am working with: Medutest · GL Biochem (Shanghai). I would like help reading this properly rather than being told what conclusion to reach. I have the full…

vendor-investigate
vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

41 questions
vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
asked by lucia_marchetti 18k · 8 months ago
9 votes 5 answers8.2k views
What would you ask Wuhan Wansheng Biotechnology before a first order that they cannot fake?

I have kept every message, invoice and document, which I gather is the useful habit. I can find plenty of assertions about this and almost no reasoning, which is…

vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
asked by mg_per_ml 12k · 5 months ago
9 votes 5 answers6.1k views
How do I verify that a COA actually came from the laboratory named on it?

I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I would rather be corrected now than propagate something wrong. I am…

coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
janoshik
janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

34 questions
vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
asked by vial_five 15k · 2 months ago
9 votes5 answers5.2k views
What does a lot-specific certificate on a JEEP report change about how I read it?

What I am working with: lot-specific certificate · JEEP. I have read the primary source rather than the summary, which has left me with more questions. I understand…

coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
asked by lane_transit 42k · 18 days ago
9 votes0 answers3.7k views
What would you ask Tianjin Finder Chemical before a first order that they cannot fake?

This is a first order from this supplier, so I have no track record to reason from. This is a procedural question rather than a theoretical one, and I would like the…

vendor-vetting
vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

436 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
batch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
asked by w_okoye 40k · 6 months ago