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Intersection · Sourcing × blind sampling

Sourcing topics tagged blind sampling

Topics in Sourcing carrying the tag blind sampling. Submitting without the laboratory or seller knowing the source.

18 topics

Topic	Participants	Replies	Views	Activity
Chain of custody for a sample you posted yourself PeptideMeter third-party testing Janoshik Analytical blind sampling Chain of custody for a sample you posted yourself Writing it up because I had to work it out twice and would rather nobody else did. I was wrong about chain of custody in a thread last spring and I would like…		2	7.3k	5h
Aggregate verification data across the directory, with caveats Medutest blind sampling PeptideMeter Under review On the subject in the title: Aggregate verification data across the directory, with caveats Working notes rather than a conclusion. I have spent a fortnight trying to pin aggregate verification data down and…	+64	74	4.6k	14h
Chain of custody for a sample you posted yourself — one year on VendorInvestigate Janoshik Analytical blind sampling third-party testing Posting this under the heading it deserves: Chain of custody for a sample you posted yourself — one year on Everything below is what sits behind that. Posting a small dataset on Chain of custody. It is mine,…	+28	32	50k	15h
[2026 update] Interpreting a result that disagrees with the supplier's certificate Medutest VendorInvestigate blind sampling third-party testing Solved On the subject in the title: Interpreting a result that disagrees with the supplier's certificate Working notes rather than a conclusion. Structured report rather than an opinion, following the format the…	+121	128	51k	17h
Submitting a sample: the process end to end blind sampling PeptideMeter VendorInvestigate third-party testing On the subject in the title: Submitting a sample: the process end to end Working notes rather than a conclusion. Submitting a sample keeps being re-asked here and I think that is because the answer is…	+99	114	29k	21h
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? PeptideMeter VendorInvestigate third-party testing Janoshik Analytical Asking directly, because I could not find a straight answer: How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? A question about how a record should be read rather than…	+24	28	8k	1mo
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Janoshik Analytical blind sampling PeptideMeter VendorInvestigate Solved How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset I have a specific reason for asking rather than idle curiosity, and the context is below. Posting a small dataset on…	+42	46	46k	2mo
Turnaround times and what they mean for a decision PeptideMeter Medutest Janoshik Analytical VendorInvestigate Turnaround times and what they mean for a decision Writing it up because I had to work it out twice and would rather nobody else did. A question about turnaround times that I think has a definite answer,…		4	29k	3mo
What a documentation review can and cannot tell you — a second dataset Janoshik Analytical VendorInvestigate blind sampling third-party testing The question in the title: What a documentation review can and cannot tell you — a second dataset I will give what I have already checked below so nobody repeats it. Posting a small dataset on documentation…		4	170	4mo
Second pass at: Submitting a sample: the process end to end Janoshik Analytical PeptideMeter Medutest blind sampling Solved Second pass at: Submitting a sample: the process end to end Writing it up because I had to work it out twice and would rather nobody else did. Posting a small dataset on Submitting a sample. It is mine, it is…	+12	16	41k	4mo
Interpreting a result that disagrees with the supplier's certificate Janoshik Analytical Medutest PeptideMeter third-party testing Interpreting a result that disagrees with the supplier's certificate Writing it up because I had to work it out twice and would rather nobody else did. Structured report rather than an opinion, following the…	+129	153	7.3k	5mo
Publishing an inconvenient result: a case study — the long version Janoshik Analytical PeptideMeter Medutest blind sampling Publishing an inconvenient result: a case study — the long version Writing it up because I had to work it out twice and would rather nobody else did. A narrow question about Publishing an inconvenient result,…	+68	74	12k	7mo
What a documentation review can and cannot tell you Medutest VendorInvestigate Janoshik Analytical blind sampling Solved Wiki What a documentation review can and cannot tell you — that is the question, and I have not found it answered plainly anywhere I have looked. Something about documentation review does not reconcile and I would…	+79	83	950	11mo
Splitting a vial for two laboratories: how to do it without ruining both blind sampling PeptideMeter third-party testing Medutest Solved Splitting a vial for two laboratories: how to do it without ruining both — setting out what I have, and where I think it stops being reliable. Something about splitting a vial does not reconcile and I would…	+64	70	4.4k	13mo
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ blind sampling PeptideMeter Medutest third-party testing How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ I have a specific reason for asking rather than idle curiosity, and the context is below. A question about how a record should be read rather…	+117	130	3.3k	14mo
Revisiting: Aggregate verification data across the directory, with caveats PeptideMeter third-party testing blind sampling Medutest Closed Revisiting: Aggregate verification data across the directory, with caveats — setting out what I have, and where I think it stops being reliable. I have spent a fortnight trying to pin Aggregate verification…	+22	26	23k	17mo
Choosing which test to pay for, given a fixed budget — does this still hold? PeptideMeter blind sampling Janoshik Analytical VendorInvestigate Choosing which test to pay for, given a fixed budget — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below. A question about how a record should be…	+35	39	755	20mo
Splitting a vial for two laboratories: how to do it without ruining both — what changed since VendorInvestigate third-party testing Medutest blind sampling Closed Posting this under the heading it deserves: Splitting a vial for two laboratories: how to do it without ruining both — what changed since Everything below is what sits behind that. Something about Splitting a…	+107	115	5.2k	22mo

Sponsored Janoshik Analytical — independent third-party testingHPLC purity and mass-spectrometric identity on submitted samples, reported with the method stated. The laboratory most often cited in this community’s verification records.Independent testing → Sponsored GL Biochem (Shanghai) Ltd. — synthesis, directFounded 1998. ISO 9001 and cGMP certified, over 1,500 staff and 200-plus patents. Custom peptide synthesis and amino acid derivatives, with a batch certificate on every order.Custom synthesis →