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peptidemeter

Page 3 of 5 · 107 questions tagged peptidemeter.

107 questions · sorted by votes · page 3 of 5

22 votes5 answers17k views
Is a 97.1% result from PeptideMeter comparable to 96.8% from Medutest?

For reference: 97.1% · PeptideMeter · 96.8% · Medutest. I am trying to choose between two options that are usually discussed as though only one exists. I am 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…

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
reference-standard
reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 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
medutest
medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questions
asked by pierce_count 24k · 8 months ago
22 votes 5 answers16k views
Is a 98.4% result from PeptideMeter comparable to 98.2% from Medutest?

The specifics, since they change the answer: 98.4% · PeptideMeter · 98.2% · Medutest. The comparison I want does not seem to exist anywhere in a form I can evaluate.…

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
reference-standard
reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 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
medutest
medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questions
asked by s_bhattacharya 31k · 5 months ago
22 votes 4 answers14k views
Why would PeptideMeter report 98.4% where the supplier certificate says something higher?

Conditions: PeptideMeter · 98.4%. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know whether this is…

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
hplc
hplc

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

503 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
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 Dr_Elias_Weiss 25k · 12 months ago
22 votes 3 answers9.5k views
How do VendorInvestigate and PeptideMeter compare on the same cagrilintide batch?

What I am working with: VendorInvestigate · PeptideMeter · cagrilintide. I am trying to choose between two options that are usually discussed as though only one…

janoshik
janoshik

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

139 questions
medutest
medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 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-investigate
vendor-investigate

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

113 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 zainab_mustafa 21k · 3 months ago
22 votes 4 answers5.6k views
Why would PeptideMeter report 97.1% where the supplier certificate says something higher?

Conditions: PeptideMeter · 97.1%. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know whether this is…

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
hplc
hplc

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

503 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
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 zainab_mustafa 21k · 4 months ago
21 votes 5 answers25k views
What has PeptideMeter published on QST lots in the last year?

What I am working with: PeptideMeter · QST. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I am reasonably…

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
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-comparison
vendor-comparison

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

388 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 rota_site 36k · 2.3 years ago
21 votes5 answers24k views
Is a 97.9% result from Medutest comparable to 96.4% from PeptideMeter?

Stated plainly: 97.9% · Medutest · 96.4% · PeptideMeter. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume I can…

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
reference-standard
reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questions
medutest
medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 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 petra_hovland 35k · 11 months ago
21 votes 5 answers23k views
How do I reconcile 97.6% from PeptideMeter with 97.1% from the supplier?

The specifics, since they change the answer: 97.6% · PeptideMeter · 97.1%. An unexpected observation, and I would like a differential rather than reassurance. 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
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 rae_oyelowo 17k · 12 months ago
21 votes0 answers15k views
How do I reconcile 98.8% from PeptideMeter with 97.6% from the supplier?

The specifics, since they change the answer: 98.8% · PeptideMeter · 97.6%. 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 Dr_Priya_Raghunathan 49k · 2.2 years ago
20 votes 5 answers34k views
What has PeptideMeter published on Homopeptide lots in the last year?

The particulars: PeptideMeter · Homopeptide. I want to understand what this actually establishes, as opposed to what it is being used to imply. My concern is that I…

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
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-comparison
vendor-comparison

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

388 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 mateo_iglesias 12k · 17 months ago
20 votes 4 answers3.9k views
What does PeptideMeter verification of Qingdao Saber Technology actually cover?

Stated plainly: PeptideMeter · Qingdao Saber Technology. I want to understand what this actually establishes, as opposed to what it is being used to imply. My concern…

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
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 rune_thoresen 16k · 1 months ago
20 votes5 answers3.8k views
Why would PeptideMeter report 99.1% where the supplier certificate says something higher?

Concretely: PeptideMeter · 99.1%. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know whether this is…

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
hplc
hplc

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

503 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
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 dana_wexler 11k · 40 days ago
20 votes 5 answers3.3k views
Is a 98.4% result from VendorInvestigate comparable to 97.6% from PeptideMeter?

The case in front of me: 98.4% · VendorInvestigate · 97.6% · PeptideMeter. I would like the axes of comparison first and the recommendation second. I have tried 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
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
reference-standard
reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questions
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
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 helena_vidmar 8.5k · 3 months ago
19 votes0 answers14k views
What does PeptideMeter verification of Tianjin Finder Chemical actually cover?

Conditions: PeptideMeter · Tianjin Finder Chemical. I want to understand what this actually establishes, as opposed to what it is being used to imply. My concern is…

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
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 jana_horakova 10k · 20 months ago
19 votes 2 answers5.1k views
How do I reconcile 98.2% from PeptideMeter with 96.8% from the supplier?

The particulars: 98.2% · PeptideMeter · 96.8%. Something has gone wrong and I would like to know how badly before I decide what to do. Nothing else in the setup…

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 ellis_thorne 17k · 9 days ago
19 votes2 answers3.8k views
Is a 99.1% result from PeptideMeter comparable to 98.8% from Medutest?

The particulars: 99.1% · PeptideMeter · 98.8% · Medutest. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read the arguments…

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
reference-standard
reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 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
medutest
medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questions
asked by ines_delacruz 16k · 37 days ago
18 votes 5 answers9.3k views
How would I detect dimerisation in a GLP-1 receptor agonist vial without sending it to PeptideMeter?

What I am working with: dimerisation · a GLP-1 receptor agonist · PeptideMeter. This is a procedural question rather than a theoretical one, and I would like the…

vial-inspection
vial-inspection

What you can learn by looking: cake morphology, meniscus films, fibres versus stopper fragments versus true particulates, clarity after…

66 questions
peptide-stability
peptide-stability

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

908 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
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 h_villanueva 70k · 6 months ago
18 votes3 answers4.4k views
What system suitability numbers should I insist on seeing before I believe a purity or content figure?

I have started asking labs for "the system suitability data" and getting back either silence, a shrug, or a screenshot of six retention times. I clearly do not know…

reference-standard
reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questions
hplc
hplc

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

503 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
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 tenth_of_a_unit 57k · 4 months ago
16 votes 5 answers15k views
How do I reconcile 96.8% from PeptideMeter with 99.1% from the supplier?

The particulars: 96.8% · PeptideMeter · 99.1%. Something has gone wrong and I would like to know how badly before I decide what to do. Nothing else in the setup…

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 tare_weight 60k · 18 months ago
16 votes 2 answers12k views
How do I read an oral semaglutide chromatogram from PeptideMeter beyond the headline number?

The case in front of me: oral semaglutide · PeptideMeter. I want to understand what this actually establishes, as opposed to what it is being used to imply. My…

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
oral-glp1
oral-glp1

Oral routes for GLP-1 receptor agonism: peptide formulations rescued by absorption enhancers such as SNAC, and true small molecules that need no…

219 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 valentina_rossi 9.7k · 13 months ago
15 votes4 answers27k views
How do PeptideMeter and VendorInvestigate compare on the same orforglipron batch?

What I am working with: PeptideMeter · VendorInvestigate · orforglipron. These are treated as interchangeable and I do not think they are. If both are acceptable I…

janoshik
janoshik

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

139 questions
medutest
medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 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
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
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
asked by claudia_ferrante 22k · 20 months ago
15 votes 3 answers13k views
How do I reconcile 96.8% from PeptideMeter with 96.4% from the supplier?

For reference: 96.8% · PeptideMeter · 96.4%. An unexpected observation, and I would like a differential rather than reassurance. The conditions were within what 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…

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 lucia_marchetti 19k · 11 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 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