AX-2026-041569 · Pramlintide · QSC lot QSC-2511-T6680

Section 1

Results

Measured against the index acceptance specification for the incretin analogues and co-agonists class. A specification is a decision the index made; a result is a measurement. See where each threshold came from.

Parameter	Method	Result	Unit	Index spec
Purity	RP-HPLC, 32 min gradient, 214 nm	98.79	% area	≥ 97.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	1.21	% area	≤ 2.5	PASS
Largest single impurity	RP-HPLC — C-terminal free acid (+1 Da)	0.55	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	3947.1064	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	3947.0993	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-1.8	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	89.66	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	88.58	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	2.13	mg	2 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	1.887	mg	2 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	94.4	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	5.63	%	≤ 8.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	4.27	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.44	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	1.00	EU/mg	≤ 5.0	PASS
Sterility	not ordered on this submission	not determined	—	no growth	NOT TESTED
Appearance	visual, diffuse light, black and white background	White lyophilised cake, intact	—	white to off-white intact cake	PASS
Reconstitution clarity	reconstituted per submitter procedure	Clear, colourless, no visible particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	5.28	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 32 min gradient	15.59	min	14.79 ± 0.35 (normalised)	FAIL
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.42	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	42,366	—	≥ 20,000	PASS
Resolution to nearest impurity	vs C-terminal free acid (+1 Da)	1.00	—	no index criterion	REPORTED

Section 2

Chromatogram and peak integration

The figure is drawn from the table. It is not an independent illustration — if a number in the table changed, the trace would change with it.

Figure 1. RP-HPLC trace, 32 min gradient, 214 nm. Drawn from the peak-integration table below: peak positions are the reported retention times, peak areas are the reported area percentages, peak widths follow the reported plate count of 42,366, and skew follows the reported asymmetry factor of 1.42. Baseline noise is seeded from the report ID and is illustrative. The lower panel is the same trace at a stated vertical expansion with the slow gradient drift subtracted, because at full scale a 0.55 % impurity against a 98.79 % main peak is a line two pixels tall; the main peak runs off-scale there by design.

#	Peak	RT	Area (µV·s)	% area	Δ mass (Da)
1	Pramlintide — main peak	15.59	4,801,500	98.79	—
2	C-terminal free acid (+1 Da)	15.90	26,732	0.55	+0.984
3	pramlintide dimer	18.73	13,609	0.28	+3945.091
4	open-chain (reduced disulfide, +2 Da)	14.61	10,207	0.21	+2.016
5	des-Lys1 (−128 Da)	15.05	8,263	0.17	-128.095
Closure check — purity + Σ impurities				100.00	CLOSES

Reporting threshold 0.05 % area. Peaks below it are not reported and are therefore excluded from the total, which overstates purity by their sum — see peak integration.

Section 3

Mass spectrum and identity

Theoretical monoisotopic mass 3947.1064 Da, computed from C171H267N51O53S2. All ppm figures on this site are against monoisotopic values — see why that matters.

Figure 2. ESI charge-state envelope, high-resolution instrument. Sticks are placed at m/z = (M + z × 1.007276)/z for the observed neutral mass of 3947.0993 Da. Sodium (+21.982/z) and potassium (+37.956/z) adducts are shown where the parent charge state exceeds 25 % relative abundance; they are adducts of the same molecule and are not impurities.

Charge	Theoretical m/z	Observed m/z	Δ m/z	Rel. abundance (%)
6+	658.8583	658.8572	-0.0011	8.7
5+	790.4286	790.4271	-0.0015	56.7
4+	987.7839	987.7821	-0.0018	100.0
3+	1316.7094	1316.7070	-0.0024	49.3
2+	1974.5605	1974.5569	-0.0036	8.3

Section 4

Gravimetric mass balance

Water, counter-ion, residual and total peptide content are exhaustive and mutually exclusive categories. They must account for 100 % of the cake mass. The index closes this to within 0.02 pp and the build asserts it.

Component	Determination	%w/w of cake
Water	Karl Fischer	5.63
Counter-ion (acetate)	ion chromatography	4.27
Residual solvent + inorganic residue	estimated	0.44
Total peptide content	by difference	89.66
Total		100.00 CLOSES

Supplier certificate, as declared

The supplier's own figures for this lot, beside the independent measurement. Divergence is assessed against the batch median, not against this single report — see rule AX-R05.

Figure	Supplier COA	This report	Index note
Purity (% area)	99.82	98.79	divergence +0.69 pp vs batch median
Total impurities (% area)	0.18	1.21
Largest single impurity (% area)	0.12	0.55
Water (%)	3.8	5.63
Counter-ion (%)	not stated	4.27
Peptide content (%w/w)	not stated	89.66
Endotoxin (EU/mg)	not stated	1.00
Method stated on certificate	YES	—	column, gradient and wavelength given

Section 5

Provenance and caveats

Where a sample came from changes the weight of the evidence. The index treats it as a first-class field.

Sample provenance: Buyer-sourced
Evidentiary weight: Strongest available evidence in this index.
Chain of custody: Retail purchase → third-party forwarder (29 d) → laboratory (courier, cold pack, 5 d) → assay.
Assay date: 23 Mar 2026
Submitted to the index: 02 Apr 2026
Laboratory: VendorInvestigate, Riga, Latvia
Method basis: 32 min gradient · high-resolution MS
Verification status: VERIFIED

What this report does not establish

That the material is sterile. Sterility was not tested.
That any other vial in the same lot has the same composition. One vial was tested. Within-lot vial-to-vial variation in this index has a median of 0.28 pp and a 90th percentile of 0.74 pp.
That any other lot from the same supplier has the same composition. Batch-to-batch variation is larger than within-batch variation for every supplier here.
That the material is suitable for administration to a human or an animal. These are research compounds. No result on this site is a safety assessment and the index takes no position on use.
That the material was manufactured by the supplier that sold it. Contract synthesis is normal in this market and twenty-nine batches in the index fingerprint to a bulk from a different company than the one named on the label.

Section 6

Annotations

No annotations on this record. Annotations are short signed technical comments from index contributors; see how to contribute.

Section 7

Related records

Same batch — lot QSC-2511-T6680 n=10

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041563	QSC-2511-T6680	PeptideMeter	2026-Q1	99.10	6.10	94.2	Supplier-supplied	0	PASS
AX-2026-041564	QSC-2511-T6680	Janoshik	2026-Q1	98.92	5.77	103.2	Laboratory-retained	0	PASS
AX-2026-041565	QSC-2511-T6680	PeptideMeter	2026-Q1	99.15	5.74	—	Supplier-supplied	0	PASS
AX-2026-041566	QSC-2511-T6680	PeptideMeter	2026-Q1	99.93	5.27	106.7	Supplier-supplied	1	MARGINAL
AX-2026-041567	QSC-2511-T6680	Janoshik	2026-Q1	98.73	5.07	—	Supplier-supplied	1	MARGINAL
AX-2026-041568	QSC-2511-T6680	Janoshik	2026-Q1	99.16	5.45	—	Supplier-supplied	0	PASS
AX-2026-041570	QSC-2511-T6680	VendorInvestigate	2026-Q1	98.23	5.45	—	Buyer-sourced	1	MARGINAL
AX-2026-041571	QSC-2511-T6680	PeptideMeter	2026-Q1	99.51	5.25	96.7	Supplier-supplied	0	PASS
AX-2026-041572	QSC-2511-T6680	Janoshik	2026-Q1	99.37	5.63	—	Supplier-supplied	0	PASS

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Pramlintide records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043488	WXT	WXT-2603-D6052	Janoshik	2026-Q3	97.87	4.37	—	Supplier-supplied	1	MARGINAL
AX-2026-041568	QSC	QSC-2511-T6680	Janoshik	2026-Q1	99.16	5.45	—	Supplier-supplied	0	PASS
AX-2026-041563	QSC	QSC-2511-T6680	PeptideMeter	2026-Q1	99.10	6.10	94.2	Supplier-supplied	0	PASS
AX-2026-041572	QSC	QSC-2511-T6680	Janoshik	2026-Q1	99.37	5.63	—	Supplier-supplied	0	PASS
AX-2026-041567	QSC	QSC-2511-T6680	Janoshik	2026-Q1	98.73	5.07	—	Supplier-supplied	1	MARGINAL
AX-2026-041566	QSC	QSC-2511-T6680	PeptideMeter	2026-Q1	99.93	5.27	106.7	Supplier-supplied	1	MARGINAL
AX-2026-041571	QSC	QSC-2511-T6680	PeptideMeter	2026-Q1	99.51	5.25	96.7	Supplier-supplied	0	PASS
AX-2026-041565	QSC	QSC-2511-T6680	PeptideMeter	2026-Q1	99.15	5.74	—	Supplier-supplied	0	PASS

Other recent QSC records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041683	CJC-1295 (no DAC)	QSC-2606-V8637	Janoshik	2026-Q3	99.93	3.63	97.1	Supplier-supplied	1	FAIL
AX-2026-041727	CJC-1295 with DAC	QSC-2602-E9474	Janoshik	2026-Q3	98.88	6.62	105.3	Supplier-supplied	1	MARGINAL
AX-2026-041728	CJC-1295 with DAC	QSC-2602-E9474	VendorInvestigate	2026-Q3	98.42	7.04	—	Buyer-sourced	1	MARGINAL
AX-2026-041734	CJC-1295 with DAC	QSC-2602-E9474	Medutest	2026-Q3	99.43	7.17	105.5	Supplier-supplied	2	FAIL
AX-2026-041652	Liraglutide	QSC-2605-W8602	Nordanalyt	2026-Q3	99.33	6.55	—	Supplier-supplied	0	PASS
AX-2026-041730	CJC-1295 with DAC	QSC-2602-E9474	PeptideMeter	2026-Q3	98.79	6.93	95.4	Supplier-supplied	1	MARGINAL
AX-2026-041686	CJC-1295 (no DAC)	QSC-2606-V8637	Janoshik	2026-Q3	99.93	4.04	—	Supplier-supplied	0	PASS
AX-2026-041653	Liraglutide	QSC-2605-W8602	VendorInvestigate	2026-Q3	98.82	5.95	—	Buyer-sourced	0	PASS