AssayIndex

BCH-2511-G7276

MK-677 (Ibutamoren mesylate) · 500 mg declared · Bachem Holding (Suzhou) Co., Ltd. · manufactured 13 Nov 2025

CHARACTERISED
Lot code
BCH-2511-G7276
Supplier
BCH — Bachem Holding (Suzhou) Co., Ltd.
Compound
MK-677 (Ibutamoren mesylate)
Compound class
Non-peptide adjuncts
Declared label claim
500mg
Manufacture date
13 Nov 2025
Index quarter
2026-Q2
Independent assays
13
Laboratories involved
Medutest, Janoshik, PeptideMeter, VendorInvestigate
Provenance mix
Buyer-sourced ×3 · Supplier-supplied ×9 · 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 13
Median purity 98.35% n=13
Spread (max − min) 0.99pp n=13
Standard deviation 0.261pp n=13
96.997.498.098.599.199.6100.2This lot (BCH-2511-G7276)This lot (BCH-2511-G7276): Q1 98.18, median 98.35, Q3 98.37, n=13outlier 97.60n=13All MK-677 (Ibutamoren mesylate)All MK-677 (Ibutamoren mesylate): Q1 98.51, median 99.37, Q3 99.77, n=152n=152 Purity (% area)
Figure 1. This lot's independent purity results against the whole MK-677 (Ibutamoren mesylate) record set in the index. The vertical line is the index acceptance specification for the non-peptide adjuncts class, 98.5 % 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 13

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-2026-043521BCH-2511-G7276Medutest2026-Q298.434.78Supplier-supplied2FAIL
AX-2026-043522BCH-2511-G7276Janoshik2026-Q298.134.2196.8Supplier-supplied1FAIL
AX-2026-043523BCH-2511-G7276Janoshik2026-Q298.214.31Supplier-supplied1FAIL
AX-2026-043524BCH-2511-G7276Janoshik2026-Q298.364.68Supplier-supplied1FAIL
AX-2026-043525BCH-2511-G7276Medutest2026-Q298.374.32Buyer-sourced1FAIL
AX-2026-043526BCH-2511-G7276Medutest2026-Q297.604.50Buyer-sourced1FAIL
AX-2026-043527BCH-2511-G7276Janoshik2026-Q298.354.3695.5Supplier-supplied1FAIL
AX-2026-043528BCH-2511-G7276Janoshik2026-Q298.354.90Supplier-supplied1FAIL
AX-2026-043529BCH-2511-G7276Janoshik2026-Q298.354.48101.5Supplier-supplied1FAIL
AX-2026-043530BCH-2511-G7276PeptideMeter2026-Q298.554.2888.8Supplier-supplied2FAIL
AX-2026-043531BCH-2511-G7276Janoshik2026-Q298.594.34Supplier-supplied1FAIL
AX-2026-043532BCH-2511-G7276Janoshik2026-Q298.184.32Laboratory-retained1FAIL
AX-2026-043533BCH-2511-G7276VendorInvestigate2026-Q297.965.07Buyer-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
Medutest398.43, 98.37, 97.6098.3725min+0.0898.29
Janoshik898.13, 98.21, 98.36, 98.35, 98.35, 98.35, 98.59, 98.1898.3530min+0.0098.35
PeptideMeter198.5598.5528min-0.0598.60
VendorInvestigate197.9697.9632min-0.1198.07

This lot contributes 6 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)98.6198.43divergence +0.26 pp vs batch median
Total impurities (% area)1.391.57
Largest single impurity (% area)0.990.98
Water (%)not stated4.78
Counter-ion (%)not stated15.35
Peptide content (%w/w)not statednot determined
Endotoxin (EU/mg)0.37not determined
Method stated on certificateYEScolumn, 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
spiroindane regioisomer13 / 130.880.21–1.27
free base (des-mesylate, −96 Da)13 / 130.470.32–1.09
sulfonamide hydrolysis product (+18 Da)13 / 130.090.05–0.14
residual DMF (process solvent)13 / 130.080.06–0.10
O-desmethyl metabolite analogue (−14 Da)13 / 130.070.05–0.77
Section 7

What this rollup does not establish