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coa

Page 21 of 33 · 771 questions tagged coa.

771 questions · sorted by votes · page 21 of 33

15 votes 4 answers9.6k views
How does GL Biochem compare to Hubei Jianxiang Bioscience on documentation quality?

Details up front: GL Biochem · Hubei Jianxiang Bioscience. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read the arguments…

vendor-comparison
vendor-comparison

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

388 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…

771 questions
vendor-vetting
vendor-vetting

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

454 questions
asked by jana_horakova 10k · 3 months ago
15 votes 5 answers7.9k views
How does TFC compare to Zhuhai Kerui Biotechnology on documentation quality?

Stated plainly: TFC · Zhuhai Kerui Biotechnology. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to know that,…

vendor-comparison
vendor-comparison

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

388 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…

771 questions
vendor-vetting
vendor-vetting

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

454 questions
asked by area_percent 9.9k · 6 months ago
15 votes 5 answers7.7k views
Does QSC issue lot-specific documentation, or a batch certificate?

The lot number on the vial matches the certificate, which at least rules out the easy problem. I would like help reading this properly rather than being told what…

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…

910 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…

771 questions
vendor-vetting
vendor-vetting

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

454 questions
asked by void_volume 9.5k · 14 months ago
15 votes 5 answers7.1k views
Has anyone independently verified a Homopeptide liraglutide batch COA?

The specifics, since they change the answer: Homopeptide · liraglutide. The claim is plausible, which is exactly why I want to check it. I am able to read a paper if…

vendor-vetting
vendor-vetting

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

454 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…

771 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…

910 questions
liraglutide
liraglutide

A once-daily GLP-1 receptor agonist and the compound that established the class. Still relevant for its shorter half-life, its paediatric and…

235 questions
asked by fill_volume 22k · 3 months ago
15 votes 4 answers7k views
How do I set an accept/reject threshold before I see the result?

This is my second independent submission on material from the same supplier. This is a planning question. I know what my options are; I do not know how to weigh them.…

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…

910 questions
harm-reduction
harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

472 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…

771 questions
asked by label_claim 30k · 15 months ago
15 votes5 answers6.7k views
Would you re-test a GLP-1 receptor agonist after six weeks at minus 20 °C, or accept the original certificate?

Details up front: a GLP-1 receptor agonist · six weeks · minus 20 °C. This is a planning question. I know what my options are; I do not know how to weigh them. What I…

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…

910 questions
peptide-stability
peptide-stability

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

908 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…

771 questions
asked by p_mkhize 58k · 5 months ago
15 votes4 answers6.3k views
How do I reconcile 99.1% from PeptideMeter with 97.9% from the supplier?

The specifics, since they change the answer: 99.1% · PeptideMeter · 97.9%. Something has gone wrong and I would like to know how badly before I decide what to do.…

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…

833 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…

910 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…

771 questions
peptidemeter
peptidemeter

PeptideMeter, an independent peptide analytics and vendor-rating service. Use this tag for its published datasets, its rating methodology, and how…

107 questions
asked by bea_castellanos 24k · 3 months ago
15 votes 2 answers6.2k views
How many vials from an HJ lot should I send for a sterility test?

What I have: HJ · 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 number, so I…

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…

910 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…

771 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,…

260 questions
sterility
sterility

Sterility as a test result rather than an adjective. Covers what a sterility test actually measures, why "sterile filtered" on a document is close…

142 questions
asked by kirsi_lahtinen 25k · 3 months ago
15 votes 5 answers5k views
What does a 98.4% purity with a batch certificate attached let me conclude?

What I am working with: 98.4% · batch certificate. I have read the primary source rather than the summary, which has left me with more questions. I understand the…

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…

833 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…

771 questions
hplc
hplc

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

503 questions
asked by mass_shift_18 9.7k · 2 months ago
15 votes0 answers5k views
Would you re-test ecnoglutide after four weeks at 4 °C, or accept the original certificate?

The case in front of me: ecnoglutide · four weeks · 4 °C. The failure mode I am trying to avoid is making this decision emotionally. I have twelve months in view and…

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…

910 questions
peptide-stability
peptide-stability

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

908 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…

771 questions
ecnoglutide
ecnoglutide

A long-acting GLP-1 receptor agonist with a cAMP-biased signalling profile. A niche tag, mostly used for mechanism questions about biased agonism…

223 questions
asked by tare_weight 60k · 3 months ago
15 votes5 answers4.8k views
What does Janoshik verification of Bachem Holding (Suzhou) actually cover?

The specifics, since they change the answer: Janoshik · Bachem Holding (Suzhou). I can parse the result. I am less sure what it licenses me to conclude. I have…

vendor-investigate
vendor-investigate

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

113 questions
vendor-vetting
vendor-vetting

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

454 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…

771 questions
janoshik
janoshik

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

139 questions
asked by hana_petrikova 10k · 3 months ago
15 votes0 answers4.8k views
What does 98.4% purity on a C4 column actually tell me about a dulaglutide vial?

Conditions: 98.4% · a C4 column · dulaglutide. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the…

hplc
hplc

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

503 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…

833 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…

771 questions
dulaglutide
dulaglutide

A once-weekly GLP-1 receptor agonist built on an Fc fusion rather than fatty-acid acylation. Use this tag for questions about the fusion-protein…

200 questions
asked by marcus_thorbjorn 9.4k · 2 months ago
15 votes 2 answers3.9k views
How do I reconcile 98.2% from PeptideMeter with 99.4% from the supplier?

The specifics, since they change the answer: 98.2% · PeptideMeter · 99.4%. Something has gone wrong and I would like to know how badly before I decide what to do.…

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…

833 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…

910 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…

771 questions
peptidemeter
peptidemeter

PeptideMeter, an independent peptide analytics and vendor-rating service. Use this tag for its published datasets, its rating methodology, and how…

107 questions
asked by mass_shift_18 9.7k · 5 months ago
15 votes5 answers2.9k views
Has anyone independently verified a BCH mazdutide batch COA?

What I am working with: BCH · mazdutide. This has the shape of a fact but I cannot find its origin. What I found instead were three secondary sources all citing each…

vendor-vetting
vendor-vetting

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

454 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…

771 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…

910 questions
mazdutide
mazdutide

A GLP-1 and glucagon receptor dual agonist developed primarily in China, with a distinct dose range and a fast-moving publication record.…

237 questions
asked by rune_thoresen 16k · 34 days ago
14 votes 5 answers28k views
What does a 503A pharmacy need to prepare ecnoglutide lawfully?

This is a United States plan; I appreciate the answer is jurisdiction-specific. 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…

771 questions
ecnoglutide
ecnoglutide

A long-acting GLP-1 receptor agonist with a cAMP-biased signalling profile. A niche tag, mostly used for mechanism questions about biased agonism…

223 questions
asked by oona_kekkonen 13k · 17 months ago
14 votes 5 answers26k views
Is a sampling plan from QSC sufficient basis to skip independent testing?

For reference: sampling plan · QSC. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum viable…

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…

771 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…

910 questions
harm-reduction
harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

472 questions
asked by tobias_reint 20k · 2.1 years ago
14 votes5 answers23k views
Would you re-test liraglutide after ten weeks at 25 °C, or accept the original certificate?

For reference: liraglutide · ten weeks · 25 °C. I would like to define my thresholds before I have a result, for obvious reasons. I want a plan with explicit stopping…

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…

910 questions
peptide-stability
peptide-stability

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

908 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…

771 questions
liraglutide
liraglutide

A once-daily GLP-1 receptor agonist and the compound that established the class. Still relevant for its shorter half-life, its paediatric and…

235 questions
asked by samir_bennani 15k · 18 months ago
14 votes5 answers21k views
Has anyone independently verified a WWB dulaglutide batch COA?

The specifics, since they change the answer: WWB · dulaglutide. I would rather be corrected now than propagate something wrong. I am specifically not interested in a…

vendor-vetting
vendor-vetting

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

454 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…

771 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…

910 questions
dulaglutide
dulaglutide

A once-weekly GLP-1 receptor agonist built on an Fc fusion rather than fatty-acid acylation. Use this tag for questions about the fusion-protein…

200 questions
asked by bounty_hunter_q 15k · 21 months ago
14 votes5 answers18k views
What would you ask Qingdao Sigma Chemical before a first order that they cannot fake?

I am comparing three suppliers on documentation rather than on price. I am trying to do this correctly the first time rather than learn it by getting it wrong. I have…

vendor-vetting
vendor-vetting

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

454 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…

771 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…

910 questions
asked by oona_kekkonen 13k · 11 months ago
14 votes 5 answers16k views
What does a date of analysis on an HJ report change about how I read it?

The specifics, since they change the answer: date of analysis · HJ. I want to understand what this actually establishes, as opposed to what it is being used to imply.…

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…

771 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…

910 questions
vendor-vetting
vendor-vetting

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

454 questions
asked by second_lot 9.4k · 19 months ago
14 votes 2 answers16k views
Would you re-test tirzepatide after ten weeks at room temperature, or accept the original certificate?

Setup, so nobody has to ask: tirzepatide · ten weeks · room temperature. I would like to define my thresholds before I have a result, for obvious reasons. I want a…

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…

910 questions
peptide-stability
peptide-stability

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

908 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…

771 questions
tirzepatide
tirzepatide

A dual GIP and GLP-1 receptor agonist. Questions here cover the SURPASS and SURMOUNT programmes, the practical differences from a pure GLP-1…

370 questions
asked by juliette_farnese 13k · 14 months ago
14 votes 4 answers16k views
How do I reconcile 97.6% from Janoshik with 97.1% from the supplier?

What I have: 97.6% · Janoshik · 97.1%. I have a result I cannot explain, and I would rather diagnose it than guess. I have checked the obvious explanations and…

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…

833 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…

910 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…

771 questions
janoshik
janoshik

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

139 questions
asked by eighty_six_hours 20k · 9 months ago
14 votes5 answers16k views
How do I read an impurity table on a retatrutide certificate against the 98.2% headline?

Stated plainly: retatrutide · 98.2%. I have worked this out and I would like someone to find the error, because I suspect there is one. My working so far, for the…

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…

833 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…

771 questions
hplc
hplc

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

503 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

251 questions
asked by plunger_stop 13k · 8 months ago
14 votes0 answers15k views
What does a 98.4% purity with a sampling plan attached let me conclude?

Setup, so nobody has to ask: 98.4% · sampling plan. I would like help reading this properly rather than being told what conclusion to reach. I have the full report…

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…

833 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…

771 questions
hplc
hplc

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

503 questions
asked by rukhsana_iqbal 17k · 17 months ago