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HeavyPeptide AQUA Custom Synthesis Service

High-quality isotopically labelled peptides for absolute quantitation.

Thermo Scientific HeavyPeptide Custom Synthesis ServiceThermo Scientific HeavyPeptide AQUA Custom Synthesis Service provides isotopically labelled, AQUA-grade peptides for the relative and absolute quantitation of proteins at very low concentrations in complex protein mixtures.

HeavyPeptide sequences up to 15 amino acids in length are synthesized using the latest Fmoc solid-phase technology and purified by HPLC. All HeavyPeptide sequences come with mass spectrometric analysis, and AQUA (Absolute QUAntitation) Ultimate and QuantPro-grade peptides also come with stringent analytical HPLC to determine the final purity and assure that you are receiving only the highest quality peptides for absolute quantitation. We offer advanced heavy peptide synthesis capabilities with a wide range of labels, modifications, scales and purities to meet your research needs. HeavyPeptide AQUA-grade peptides are also part of our HeavyPeptides FasTrack Service to accelerate targeted assay development.

These peptides are packaged using our ArgonGuard service, in which peptides are packaged in argon gas to minimize amino acid oxidation during shipping and storage. This standard service helps maintain biological activity of custom peptides and reduce experimental variation.


  • Accurate – concentration precision to meet your application needs
  • Consistent results – ArgonGuard service helps maintain biological activity of peptides
  • Sensitive – enables the absolute quantification of low-abundant proteins
  • Specific – 100% peptide sequence specificity
  • Flexible – extensive list of available modifications, solvents, concentrations, aliquots and formats


  • One isotopically labelled peptide (HeavyPeptide) or non-labelled control peptide sequence
Register for the Private Sales Program for special discounts on custom peptides


  • Biomarker discovery, verification and validation
  • Functional quantitative proteomics
  • Quantitation of post-translational modifications
  • Confirmation of RNA interference (RNAi)
  • Pharmacokinetics
  • Metabolomics
  • Clinical biochemistry for drug and metabolite monitoring
  • Anti-doping testing
  • Protein expression monitoring
  • Cell signal profiling and pathway validation

Product Details:

Thermo Scientific HeavyPeptide AQUA Grades
Grade Description
AQUA Ultimate Fully solubilized peptides with a precision equal or better than ±5% that are the best choice for biomarker validation and experiments demanding ultimate quantitative precision and batch-to-batch reproducibility.
AQUA QuantPro Fully solubilized peptides with a concentration precision equal or better than ±25% that are ideal for biomarker verification.
AQUA Basic Lyophilized peptides that are more adequate for relative quantitation. The batch-to-batch consistency is difficult to predict.

Specifications of Thermo Scientific HeavyPeptide AQUA-Grade Standards
Grade AQUA Ultimate AQUA QuantPro AQUA Basic
Formulation 5pmol/μL in 5% (v/v) acetonitrile/H2O  5pmol/μL in 5% (v/v) acetonitrile/H2O Lyophilized
Actual concentration Measured by AAA Measured by AAA Measured by AAA
Concentration precision ±5% ±25%  
Peptide purity >97% >97% >95%
Isotopic enrichment >99% >99% >99%
Peptide length Up to 15 amino acids Up to 15 amino acids Up to 15 amino acids
Amount/No. of aliquots 10nmol/10 aliquots
40nmol/40 aliquots
96nmol/96 aliquots
10nmol/10 aliquots
40nmol/40 aliquots
96nmol/96 aliquots
15 to 30 nmol†† (0.05 to 0.1mg)/1 aliquot
Quality control MALDI MS and analytical HPLC MALDI MS and analytical HPLC MALDI MS and analytical HPLC
Delivery time§ 4 weeks 4 weeks 4 weeks
Shipment in solution on wet ice in solution on wet ice dry at room temp.
Product options
  • Additional light amino acids to extend the peptide length
  • Additional heavy amino acid on each peptide
  • Multiple solvents, concentrations and aliquot sizes available
  • Peptides delivered in various formats (i.e., 96-well plate with or without detachable tubes in glass or plastic, 2D barcodes, etc.)
Peptide modifications
  • Single or double phosphorylation (pY, pT or pS)
  • Cysteine carbamidomethylation (CAM)
  • Chloro-L-Tyrosine
  • Pryoglutamic acid
  • Methionine oxidation (Met[O])
  • Other modifications available on request
Amino acid analysis
§These production times are estimates that vary based on the number of kits ordered.
††The 30nmol amount is valid for peptides 6-15 amino acids in length. For shorter or longer peptides, the amount might decrease to as little as 15nmol.
CAM tends to cause cyclisation at the N-terminus. Fully cyclized form can be provided upon request.

Heavy amino acids offered with Thermo Scientific HeavyPeptide Custom Synthesis
Amino acid Code Mass difference Isotope Isotopic enrichment
Alanine A +4Da U-13C3, 15N >99%
Arginine R +10Da U-13C6, 15N4 >99%
Isoleucine I +7Da U-13C6, 15N >99%
Leucine L +7Da U-13C6, 15N4 >99%
Lysine K +8Da U-13C6, 15N2 >99%
Phenylalanine F +10Da U-13C9, 15N >99%
Proline P +6Da U-13C5, 15N >99%
Valine V +6Da U-13C5, 15N >99%
Other amino acids on request.

Every peptide synthesis is a challenge. Over the last 12 years, our team has accumulated tremendous expertise through tens of thousands of successful custom peptides syntheses. By carefully listening to our world-wide customer base, we are constantly adapting our product offering to your needs. For example, your custom peptides are now packaged using our ArgonGuard packaging service to maximize biological activity during shipment and storage. The noble gas argon is added to the vial during peptide packaging, which minimizes potential oxidation of peptides containing cysteine, methionine or tryphtophan (1).

Our team of expert peptide scientists will support you starting from the design phase of your peptide to the right modifications, scale or purity for your assay to help you obtain the best experimental results for your application.


  1. McKinnie S. M. K. et al. (2012) The solid phase supported peptide synthesis of analogues of the lantibiotic lactocin s. MedChemComm.
  2. Lehmann E. et al. (1999) Matrix-assisted laser desorption/ionization mass spectra reflect solution-phase zinc finger peptide complexation. J Am Soc Mass Spectrom. 10, 27-34.
  3. Yu Y. et al. (2009) A site-specific, multiplexed kinase activity assay using stable-isotope dilution and high-resolution mass spectrometry. Proc Natl Acad Sci U S A. 106, 11606-11.
  4. Wepf A. et al. (2009) Quantitative interaction proteomics using mass spectrometry. Nat Methods. 6, 203-5.
  5. Prakash A. et al. (2009) Expediting the development of targeted SRM assays: Using data from shotgun proteomics to automate method development. J Proteome Res. 8, 2733-9.
  6. Anderson N. L. et al. (2009) A human proteome detection and quantitation project. Mol Cell Proteomics. 8, 883-6.
  7. Lange V. et al. (2008) Selected reaction monitoring for quantitative proteomics: A tutorial. Mol Syst Biol. 4, 222.

Related Resources:

Peptide Analysis Tool
Antigen Profiler for Robust Peptide Antibody Design
List of Peptide Modifications
Amino Acid Single-Letter Codes and Physical Properties

Protein Methods Library: Peptide Synthesis
Protein Methods Library: Peptide Design
Protein Methods Library: Quantitative Proteomics

Related Products:

HeavyPeptide AQUA FasTrack Service
HeavyPeptide IGNIS Prime Peptide Quantitation Kit
1-Step Heavy Protein In Vitro Protein Expression Kits
Peptide Sample Prep Tools for Mass Spectrometry
Amino Acid Analysis Reagents and Accessories

Learn about all Peptide Products

Quote Request and Ordering Information
Download the Quote Request/Order Form (1.4mb) Download the peptide order form

Submission Information
For North America:

Email quote requests or orders to


Contact your local sales representative or call 1-800-874-3723 or 1-815-968-0747.

For Europe and all other regions:

Email quote requests to services.biopolymers@thermofisher.com

Email orders to sales.peptides@thermo.com

Or contact your local sales representative or Thermo Fisher Scientific in Ulm, Germany at +49-731-29870.

For technical support, please call
1-800-874-3723 or 1-815-968-0747
For technical support, please call +49-731-29870.

Instructions | MSDS | CofA
Product Instructions | MSDS | CofA  

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