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SILuMAB K1 Stable-Isotope Labeled Universal Monoclonal Antibody

recombinant, expressed in CHO cells

Synonym: IgG1 kappa, SILuMAB Stable-Isotope Labeled Universal Monoclonal Antibody Standard human

  •  NACRES NA.12



Related Categories Antibody Characterization and Analysis, Biochemicals and Reagents, Mass Spectrometry, Molecular Biology, Peptide and Protein Standards for Mass Spectrometry Analysis,
Quality Level   200
recombinant   expressed in CHO cells
antibody product type   primary antibodies
assay   ≥90% (SDS-PAGE)
packaging   vial of 100 μg (± 10% Lot-specific vial content given on certificate of analysis)
shipped in   wet ice
storage temp.   −20°C



SILu MAB K1 Stable-Isotope Labeled Universal Monoclonal Antibody has been used to spike peptide samples to assess preparation reproducibility.

Features and Benefits

Universal Peptide Sequence Location
SGTASVVCLLNNFYPR Light Chain (kappa)
DSTYSLSSTLTLSK Light Chain (kappa)

SILuMab has been validated as an internal standard for quantitation of relevant biotherapeutics in a complex biological matrix by MRM-based LC-MS/MS.
• SILuMab yielded reproducible, linear curves from 0.1 μg/mL to 1000 μg/mL without enrichment or depletion.
• Good agreement was observed between multiple peptides derived from the same target.
• Label incorporation was determined to be >98% by mass spectrometry.
• Sequence coverage was confirmed by peptide mapping.

Physical form

Supplied as a lyophilized powder containing phosphate buffered saline

Preparation Note

Produced utilizing enriched media containing stable isotope labeled amino acids are 13C<SUB>6</SUB>, 15N<SUB>4</SUB>-labeled Arginine and 13C<SUB>6</SUB>, 15N<SUB>2</SUB>-labeled Lysine.

SILuMab design is optimized to be used as an internal standard for quantitation of monoclonal antibodies as well as Fc-fusion therapeutics. Because of overlap with the common sequences in the Fc region with candidate antibodies, SILuMab provides univer­sal utility, thus eliminating the need for production of candidate-specific internal standards.


SILuMab recovery is maximized when 0.1% formic acid is used for reconstitution of the lyophilized product. Reconstitution with other solvents may reduce recovery. Do not freeze after reconstitution.
• Briefly centrifuge the vial at ~10,000 x g to collect the product at the bottom of the vial.
• Add 500 μL of purified water containing 0.1% formic acid to the vial.
• Mix the contents by gently inverting the vial a minimum of 5 times.
• Allow the vial to stand at room temperature for a minimum of 15 minutes and repeat mixing by inversion.

Analysis Note

MRM settings provided (xls)

SILuMAb K1 Heavy Chain


SILuMAb K1 Light Chain


Target overlap areas are underlined
Package size based on protein content determined by A280 using an extinction coefficient (E0.1%) of 1.4

Legal Information

This product is licensed under U.S. Patent No. 7,396,688 and foreign counterparts from E. I. du Pont de Nemours and Company. The purchase of this product conveys to the buyer the nontransferable right to use the purchased amount of the product for research and development only, including services for a third party for consideration. The buyer cannot sell or otherwise transfer this product, its components or materials made using this product or its components to a third party. Information about licenses for excluded uses is available from: E. I. du Pont de Nemours and Company; Attn: Associate Director, Commercial Development; DuPont Experimental Station E268; 200 Powdermill Rd.; Wilmington, DE 19803; 1-877-881-9787 (voice), 1-302-695-1437 (fax), licensing@dupont.com.

SILu is a trademark of Sigma-Aldrich Co. LLC

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

Please Enter a Lot Number

Certificate of Origin (COO)

Please Enter a Lot Number
Protocols & Articles


A Universal Dual Peptide Assay for Antibody-Based Drug Candidates in Animal PK Studies Using a Full-Length Stable Isotope Labeled Internal Standard

There is a growing demand for reliable LC–MS/MS assays to support the bioanalysis of a human monoclonal antibody-based drug candidates in preclinical studies. Traditional LC-MS/MS assays rely on anal...
Kevin Ray and Pegah R. Jalili
Sigma-Aldrich, St. Louis, MO
Keywords: Clinical, Digestions, Glycosylations, High performance liquid chromatography, Immobilization, Liquid chromatography mass spectrometry, Mass spectrometry, Size-exclusion chromatography

Related Content

Stable Isotope-labeled MS Internal Standards

What happens when you combine state-of-the-art technology with scientific prowess? Full-length protein standards with the highest purity and isotopic incorporation in the industry. Stable isotope-lab...
Keywords: Atomic absorption spectroscopy, Buffers, Digestions, Mass spectrometry, PAGE, Phosphorylations

Peer-Reviewed Papers


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