IPG-4 AM, Catalog: B3144

Alternate Names Potassium (K⁺) indicator; IPG-4 membrane permeable; IPG-4 acetoxymethyl ester; Fluorescent Potassium indicator.

Appearance Red-orange powder

Molecular Weight 1333

Purity ≥ 95%

Solubility Soluble in DMSO

Storage Conditions -20ºC

Shipping Conditions Gel Pack

Usage For Research Use Only! Not For Use in Humans.

Handling Do not take it internally. Wear gloves and a mask when handling the product! Avoid contact by all modes of exposure.

IPG-4 is a yellow-green, fluorescent, intracellular potassium (K⁺) indicator with Ex/Em: 525 nm/545 nm and a high-sensitivity to detect small changes in K⁺ concentration. It is a small, synthetic fluorochrome which incorporates a K⁺-binding moiety. When K⁺ binds, the quenching is relieved, and the fluorescence dramatically increases. IPG-4 has a higher affinity (Kd = 7 mM) than IPG-1 (Kd = 50 mM) and IPG-2 (Kd = 18 mM). It is appropriate for conditions where there may be large changes in intracellular K⁺ (e.g. highly active synapses) or as an extracellular K⁺ sensor. IPG-4 AM is the membrane permeable form of the potassium indicator. Masking the negative charge using non-polar, ester-linked moieties (AM ester) allows the molecule to enter cells through passive diffusion. Once inside the cell, ubiquitous intracellular esterase enzymes promote rapid hydrolysis of the AM ester leaving the active, highly polar form of the indicator trapped inside the cell. IPG-4 is compatible with a wide variety of detectors including fluorescent microscopes, plate readers, flow cytometers and fluorescent indicator-doped solid-state sensors.