Isotopically Labeled Compounds

Medchemexpress LLC Ethephon-d4 | 1020719-29-2 | >98.0% | 148.52 g/mol | C2H2D4ClO3P | 5 MG

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Ethephon-d4 is the deuterium-labeled analogue of ethephon supplied as a stable-isotope reference material for tracer and quantitative analytical applications. It is provided as a white to off-white solid suitable for use as an internal standard in laboratory workflows, with storage and handling recommendations for low-temperature, sealed conditions.

• Deuterium-labeled internal standard for quantitative analysis.
• Suitable for NMR, GC-MS, and LC-MS methods.
• White to off-white solid, easy to handle.
• High isotopic enrichment and chemical purity (>98.0%).
• Supplied in pre-weighed milligram quantities for analytical use.

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Revvity Health Sciences Inc L-[¹⁴C(U)]-Lysine,>97%, 250µCi (9.25MBq)

L-[¹⁴C(U)]-Lysine,>97%, 250µCi (9.25MBq)

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American Radiolabeled Chemicals Inc 3H STNDRD GLASS-1 A

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Tritium Standards on Glass Slides-1 each, 0-7390

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Medchemexpress LLC 1-Hexadecanol-d5 | 1219799-18-4 | 99.2% | 5 MG

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1-Hexadecanol-d5 is the deuterium labeled 1-Hexadecanol, which is a fatty alcohol and a lipophilic substrate. This compound is suitable for use as a tracer and as an internal standard for quantitative analysis by NMR, GC-MS, or LC-MS. The deuteration of this compound is notable for its potential to influence the pharmacokinetic and metabolic profiles of drugs.

• Used as a tracer.
• Can be used as an internal standard for quantitative analysis by NMR, GC-MS, or LC-MS.
• Deuteration can influence the pharmacokinetic and metabolic profiles of drugs.

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Cambridge Isotope Laboratories Docosanoic acid (1 2 3 4 5 6-13C6 99%) CP 95% 5 mg

Docosanoic acid (1 2 3 4 5 6-13C6 99%) CP 95% 5 mg

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Revvity Health Sciences Inc Propranolol, L-[4-³H]-, 250µCi (9.25MBq)

Propranolol, L-[4-³H]-, 250µCi (9.25MBq)

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Medchemexpress LLC Ribociclib-d8 | 2167898-24-8 | 99.2% | 440.59 | C23H25D8N8O | 10 MG

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Ribociclib-d8 is the deuterium-labeled analogue of ribociclib supplied as an analytical reference standard for use in mass spectrometry and quantitative assays. It is intended for research use and provides a traceable internal standard for accurate quantitation in bioanalytical workflows.

• Deuterium-labeled internal standard for mass spectrometry.
• High purity suitable for analytical applications.
• Soluble in DMSO for convenient preparation of stock solutions.
• Molecular weight 440.59 and formula C23H25D8N8O for exact mass matching.
• Provided in a 10 MG quantity appropriate for method development and validation.

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Cambridge Isotope Laboratories CHENODEOXYCHOLIC ACID (24-13C, 99%), 0.1 G, 52918-92-0

CHENODEOXYCHOLIC ACID (24-13C, 99%), 0.1 G, 52918-92-0

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Medchemexpress LLC 5-hydroxytryptamine-d4 | 58264-95-2 | 99.6% | 180.24 | C10H8D4N2O | 10 MG

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Serotonin-d4 is a deuterated analogue of serotonin used as a stable isotope internal standard for quantitative mass spectrometry and tracer studies. It provides a predictable mass shift for accurate quantitation and method validation in biological and biochemical analyses.

• Purity: 99.6%.
• Molecular weight: 180.24 g/mol.
• Chemical formula: C10H8D4N2O.
• Physical form: solid, light brown to brown.
• Solubility: DMSO 100 mg/mL; ultrasonic assistance recommended.
• Storage: 4°C under nitrogen; in solvent -80°C up to 6 months, -20°C up to 1 month.

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Medchemexpress LLC Adipic acid-d4 | 121311-78-2 | 98.0% | 150.17 g/mol | C6H6D4O4 | 50 MG

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Adipic acid-d4 is the deuterium-labeled form of adipic (hexanedioic) acid used as an internal standard and reference material in analytical, metabolic, and isotope-tracing studies. Supplied as a high-purity, stable powder, it is suited for quantitative mass spectrometry and chromatographic workflows where isotopic labeling improves accuracy and peak identification.

• Deuterium-labeled internal standard for quantitative analysis.
• High purity suitable for analytical use.
• Molecular formula C6H6D4O4; molecular weight 150.17 g/mol.
• Available in small research pack sizes for method development.
• Stable powder form with recommended cold storage to preserve integrity.
• Compatible with mass spectrometry and chromatographic methods.

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Medchemexpress LLC S-mirtazapine-d3 | 61337-87-9 | 99.0% | 268.37 | C17H16D3N3 | 10 MG

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Deuterated S-mirtazapine is the S-enantiomer of mirtazapine labeled with three deuterium atoms, supplied as a research-grade reference standard for analytical and pharmacology studies.

• Isotopically labeled internal standard for LC-MS/MS quantitation.
• High purity for reliable analytical results.
• Molecular weight 268.37 and formula C17H16D3N3.
• Supplied as a 10 mg vial for method development and calibration.

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Revvity Health Sciences Inc Norepinephrine, Levo-[7-³H]-, 250µCi (9.25MBq)

Norepinephrine, Levo-[7-³H]-, 250µCi (9.25MBq)

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Medchemexpress LLC Vardenafil-d5 hydrochloride | 1189685-70-8 | 98.65% | 50 MG

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Vardenafil-d5 hydrochloride | 1189685-70-8 | 98.65% | 50 MG

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Medchemexpress LLC Cholestenone-13C (4-cholesten-3-one-13C) | 68165-57-1 | 99.0% | 385.63 | C2613CH44O | 5 MG

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Cholestenone-13C is a 13C-stable isotope labeled form of cholestenone intended for use as an analytical standard and metabolic tracer in biochemical research. It serves as an internal standard for quantitative mass spectrometry and for metabolic labeling studies, and is supplied in small research quantities with specified solubility and storage recommendations.

• Stable 13C-labeled cholestenone for tracer and standard applications.
• Chemical purity 99.0% for analytical reliability.
• Molecular weight 385.63 and formula C27H44O (13C labeled).
• Soluble in ethanol at 50 mg/mL; ultrasonic may be required.
• Recommended storage: powder -20°C for long term, 4°C for short term; in solvent -80°C for months.
• Available in small research sizes, including 5 mg vials.

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Cayman Chemical CefuroxIme-d3 1mg

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An internal standard for the quantification of cefuroxime by GC- or LC-MS

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