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Apamin [125I]His18-NH2, 25µCi

Apamin, labeled with 125I on histidine residue 18. Apamin is a neurotoxin that acts as an antagonist at calcium-activated potassium channels (SK channels).

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Part Number Unit Size List Price Your Price Quantity
NEX242025UC 25 µCi 910.00 USD
NEX242050UC 50 µCi 1514.00 USD
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We offer radioligands and radiolabeled biomolecules to use as tracers, for radioimmunoassays (RIAs), for autoradiographic visualization, or for performing saturation and competition radioligand binding assays to determine receptor expression levels (Bmax), dissociation constants (Kd), association and dissociation rates (kon and koff), and inhibitor constants (Ki) for a variety of receptors. We develop our radioligands to the highest specific activity possible and provide high purity resulting in low non-specific binding products. Each of our ultra-pure radiolabeled compounds is fully characterized for pharmacological action and validated in binding assays.

Radiochemicals remain the most sensitive method for probing binding biology; yielding unprecedented sensitivity gives results that technicians and scientists can trust. For over 50 years, PerkinElmer has been a leading supplier of New England Nuclear (NEN) radiochemicals, liquid scintillation cocktails, vials and nuclear counting detection instruments.

References for NEX242:

  1. Terstappen, G., Pula, G., Carignani, C., Chen, M.X., Roncarati, R. (2001), Pharmacological characterisation of the human small conductance calcium-activated potassium channel hSK3 reveals sensitivity to tricyclic antidepressants and antipsychotic phenothiazines, Neuropharmacology, 40 (6): 772-783.
  2. Schetz, J., Anderson, P. (1995), Pharmacology of the high-affinity apamin receptor in rabbit heart, Cardiovascular Research, 30 (5): 755–762.


Detection Method Radiometric
Fresh Lot Days Fourth Monday of odd months
Label Position Nominally Labeled
Molecular Weight 2151.0
Product Brand Name NEN Radiolabeled Ligands
Radioisotope I-125
Radionuclide 125I
Receptor Type SK channels
Shipping Condition Ambient
Special Ordering Information This is a radioactive product - shipping address must have a license to receive radioactive materials.
Therapeutic Area CNS & Neurologic
Unit Size 25 µCi

Resources, Events & More

Resource Type File Name File Format
Technical Note Low Volume Handling Suggestions for Iodine-125 Labeled Compounds PDF  177 KB
Flyer Using the NENSure Packaging System from PerkinElmer PDF  447 KB