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Protein Expression & Purification

Products >  Protein_Expression_and_Purification >  Purify_Phospho-_and_Glycoproteins >  Phosphopeptide_Magnetic_Beads

Magnetic Phosphopeptide Enrichment Kit

The Magnetic Phosphopeptide Enrichment Kit uses Phospho Magnetic Beads to enhance recovery of phosphorylated peptides that might otherwise be difficult to purify and analyze. The kit can be used to rapidly enrich phosphopeptides containing phosphotyrosine, phosphoserine, or phosphothreonine. It is compatible with various elution buffers, to provide samples in formats that are ideal for different downstream applications such as matrix-assisted laser desorption ionization (MALDI) mass spectroscopy or liquid chromatography (LC).

Quick Separation

Phospho Magnetic Beads bind phosphopeptides through the specific interaction of phosphate groups with immobilized ferric ions on the surface of the beads. Magnetic particles in the beads facilitate quick and easy separation of the bead-peptide complexes from solutions using either magnetic force or gravity. Any magnetic separator that accommodates 1.5 ml microcentrifuge tubes can be used. Alternatively, a microcentrifuge can be used to separate the particles.

Optimized Buffers Minimize Nonspecific Binding

The buffers in the kit are detergent-free and have been optimized for specific phosphopeptide binding and elution. The improved Binding/Wash Buffer minimizes the nonspecific binding of peptides containing acidic residues that can complicate immobilized metal affinity chromatography (IMAC) technologies. The kit includes 100 mM ammonium bicarbonate elution buffer (pH 9.0–9.5), however, bound phosphopeptides can also be eluted into other buffers, such as 100 mM sodium carbonate buffer (pH 9.3) or phosphate buffered saline, to accommodate different applications.

Nanoscale Purification in Small Elution Volumes

Phospho Magnetic Beads are supplied as a 5% suspension, and have a binding capacity of approximately 1–2 pmol of phosphate per µg of Phospho Magnetic Beads. Different amounts of beads may be used, depending on the initial sample concentration. Phosphopeptides can be eluted in volumes as small as 20 µl to yield concentrated samples.

  At-A-Glance   Documents   Images & Data   Resources


  • Unbiased, efficient, magnetic bead-based enrichment of phosphopeptides
  • Rapid enrichment of phosphopeptides
  • Optimized buffers eliminate nonspecific binding
  • Yields highly concentrated samples ideal for LC or MALDI analysis


  • Enriching phosphorylated peptides from a mixture of phosphorylated and nonphosphorylated peptides.

Additional Information

Please see the product's Certificate of Analysis for information about storage conditions, product components, and technical specifications. Please see the Kit Components List to determine kit components. Certificates of Analysis and Kit Components Lists are located under the Documents tab.

Cat. # Product Contents Size Price Units Select
635643 Magnetic Phosphopeptide Enrichment Kit 300 Rxns $268.00


Required Products
Cat. # Product Size Price # of Units Select
631964 Magnetic Stand 2 x 1.5 mL $42.00



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