PeptideStack
5.2kquestions
20kanswers
220users

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report format, and comparisons of its results against other laboratories on the same batch.

14 questions · sorted by votes

40 votes 4 answers23k views
How do PeptideMeter and VendorInvestigate compare on the same retatrutide batch?

Conditions: PeptideMeter · VendorInvestigate · retatrutide. I would like the axes of comparison first and the recommendation second. I have tried the first option and…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 retest_please 13k · 20 months ago
36 votes 5 answers34k views
How do Janoshik and Medutest compare on the same ecnoglutide batch?

Setup, so nobody has to ask: Janoshik · Medutest · ecnoglutide. Both of these get recommended confidently by different people, which suggests neither is obviously…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 dana_wexler 15k · 18 months ago
32 votes 5 answers15k views
How do PeptideMeter and VendorInvestigate compare on the same dulaglutide batch?

The case in front of me: PeptideMeter · VendorInvestigate · dulaglutide. 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…

34 questions
medutest
medutest

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

14 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 triple_agonist_q 37k · 13 months ago
26 votes 5 answers20k views
How do VendorInvestigate and PeptideMeter compare on the same a GLP-1 receptor agonist batch?

For reference: VendorInvestigate · PeptideMeter · a GLP-1 receptor agonist. 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…

34 questions
medutest
medutest

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

14 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 swab_stopper 16k · 9 months ago
22 votes 3 answers9.5k views
How do VendorInvestigate and PeptideMeter compare on the same cagrilintide batch?

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

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 zainab_mustafa 16k · 3 months ago
20 votes 3 answers6.2k views
How is a quantitative content assay actually run, and how much should I trust the mg figure?

I am about to pay for quantification on a group of vials rather than just purity, having read enough here to understand why. Before I do, I want to know what I am…

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
reference-standard
reference-standard

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

179 questions
hplc
hplc

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

466 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
medutest
medutest

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

14 questions
asked by p_mkhize 41k · 6 months ago
19 votes0 answers7.1k views
How do Janoshik and Medutest compare on the same semaglutide batch?

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

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 per_haugen 18k · 14 months ago
17 votes0 answers4.8k views
How do Medutest and Janoshik compare on the same tirzepatide batch?

Numbers first: Medutest · Janoshik · tirzepatide. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 syringe_ninety 15k · 8 months ago
16 votes 5 answers3.3k views
How do Janoshik and Medutest compare on the same survodutide batch?

Stated plainly: Janoshik · Medutest · survodutide. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 valentina_rossi 16k · 6 days ago
15 votes4 answers27k views
How do PeptideMeter and VendorInvestigate compare on the same orforglipron batch?

Conditions: PeptideMeter · VendorInvestigate · orforglipron. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 claudia_ferrante 46k · 20 months ago
11 votes 5 answers6k views
How do Medutest and Janoshik compare on the same oral semaglutide batch?

Details up front: Medutest · Janoshik · oral semaglutide. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 ines_delacruz 16k · 2 months ago
9 votes2 answers8.9k views
How do VendorInvestigate and PeptideMeter compare on the same mazdutide batch?

For reference: VendorInvestigate · PeptideMeter · mazdutide. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read the arguments…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 dermot_kiely 14k · 2.1 years ago
7 votes5 answers6.3k views
How do Janoshik and Medutest results compare on the same batch?

This is my second independent submission on material from the same supplier. I have used one of these for a while and I am considering switching, which requires a…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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_Marek_Zielinski 39k · 11 months ago
5 votes0 answers1.4k views
How do Medutest and Janoshik compare on the same liraglutide batch?

What I have: Medutest · Janoshik · liraglutide. I have used one of these for a while and I am considering switching, which requires a reason. What I care about is…

janoshik
janoshik

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

34 questions
medutest
medutest

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

14 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 cal_hennessy 14k · 12 months ago
Sponsored

Sigma-Aldrich - Certified Reference Materials

Analytical standards and reagents with traceable certificates. Every quantitative result you read inherits the accuracy of the standard behind it.

Shop standards