AssayIndex

SGN-2409-H8807

Selank · 20 mg declared · Sangon Biotech (Shanghai) Co., Ltd. · manufactured 24 Sep 2024

CHARACTERISED
Lot code
SGN-2409-H8807
Supplier
SGN — Sangon Biotech (Shanghai) Co., Ltd.
Compound
Selank
Compound class
Neuroactive and cognitive peptides
Declared label claim
20mg
Manufacture date
24 Sep 2024
Index quarter
2025-Q1
Independent assays
7
Laboratories involved
PeptideMeter, Janoshik, Medutest
Provenance mix
Buyer-sourced ×6 · Laboratory-retained ×1
Section 1

Reproducibility across independent tests

Every report below is an observation of the same physical material. What they disagree about is measurement; what they agree about is the lot. The size of the disagreement is compared against what the contributing laboratories' own repeatability figures predict.

Independent assays 7
Median purity 98.28% n=7
Spread (max − min) 0.32pp n=7
Standard deviation 0.122pp n=7
97.497.998.398.899.299.7100.1This lot (SGN-2409-H8807)This lot (SGN-2409-H8807): Q1 98.14, median 98.28, Q3 98.31, n=7n=7All SelankAll Selank: Q1 99.20, median 99.59, Q3 99.81, n=102outlier 97.62outlier 98.00outlier 98.06outlier 98.08outlier 98.21outlier 98.28outlier 98.28n=102 Purity (% area)
Figure 1. This lot's independent purity results against the whole Selank record set in the index. The vertical line is the index acceptance specification for the neuroactive and cognitive peptides class, 99.0 % area. A narrow box on the top row against a wide box on the bottom row is the ideal reading: it means the disagreement between lots is much larger than the disagreement within this one.
Section 2

Member reports 7

Every report the index holds on this lot. Each is a page carrying its own chromatogram, mass spectrum, mass balance, provenance and caveats.

ReportLotLabQuarterPurity %Water %Recovery %ProvenanceFlagsResult
AX-2025-020683SGN-2409-H8807PeptideMeter2025-Q198.215.84—Buyer-sourced0FAIL
AX-2025-020684SGN-2409-H8807Janoshik2025-Q198.286.60105.5Laboratory-retained0FAIL
AX-2025-020685SGN-2409-H8807PeptideMeter2025-Q198.066.29—Buyer-sourced0FAIL
AX-2025-020686SGN-2409-H8807Janoshik2025-Q198.286.0799.8Buyer-sourced0FAIL
AX-2025-020687SGN-2409-H8807Medutest2025-Q198.336.2891.6Buyer-sourced0FAIL
AX-2025-020688SGN-2409-H8807Janoshik2025-Q198.386.17—Buyer-sourced0FAIL
AX-2025-020689SGN-2409-H8807Medutest2025-Q198.085.9692.9Buyer-sourced1FAIL
Section 3

By laboratory

Where more than one laboratory assayed this lot, the difference between them is a paired observation of their relative bias — the same material, the same time window, different instruments. Those pairs are what the index's bias estimates are built from.

LaboratoryReportsPurity results (% area)MedianGradientPublished bias (pp)Bias-adjusted
PeptideMeter298.21, 98.0698.1328min-0.0598.18
Janoshik398.28, 98.28, 98.3898.2830min+0.0098.28
Medutest298.33, 98.0898.2025min+0.0898.13

This lot contributes 3 paired comparisons to the inter-lab analysis.

Section 4

The supplier's certificate for this lot

One number the supplier wrote, beside the median of the numbers other people measured on the same physical material. That comparison is only available because the index groups by lot.

FigureSupplier COAThis reportIndex note
Purity (% area)98.5598.21divergence +0.27 pp vs batch median
Total impurities (% area)1.451.79
Largest single impurity (% area)1.060.80
Water (%)4.05.84
Counter-ion (%)8.07.95
Peptide content (%w/w)87.4not determined
Endotoxin (EU/mg)not statednot determined
Method stated on certificateYES—column, gradient and wavelength given
Section 5

Impurity fingerprint

The named impurities reported across this lot's assays, with how consistently each was seen. A fingerprint is what allows two lot numbers held by different companies to be identified as one bulk.

Named impurityReported inMedian % areaRange
tuftsin fragment (−417 Da)7 / 70.870.75–0.95
diketopiperazine (−18 Da)7 / 70.470.27–0.55
acetyl adduct (+42 Da)7 / 70.250.15–0.28
des-Thr (−101 Da)7 / 70.240.20–0.32
Section 7

What this rollup does not establish