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Technical documents: SDS CoA Datasheet

Product overview

Purity >98%
Customer comments

Absolute satisfaction not only with item received, but especially with communication. This product (CNQX) meets our expectation and description as declared on websites. Communication was immediate and fast. Item came second day after purchase has been done, firmly packed. Unrivaled prices, friendly approach! Verified customer, National institute of mental health Czech Republic

Another quality compound! CNQX from Hello Bio works great in our experiments and at a price that is definitely nice! We continue to be impressed with the value we get from this company. Verified customer, University of South Carolina

Description Potent, competitive AMPA / kainate receptor antagonist
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Figure 1. CNQX inhibition of evoked and spontaneous glutamate mediated EPSCs in mouse cortical neuron

The AMPA receptor antagonist CNQX is commonly used at concentrations of 10 µM to inhibit the actions of glutamate acting on AMPARs. CNQX from Hello Bio reduces both spontaneous and evoked EPSCs in cortical neurons at concentrations of 1 µM with full AMPA receptor blockade at 10 µM. For assay protocol, see #Protocol 1 in Application Notes below

Figure 2. Percentage inhibiton of glutamate (30 µM) stimulated increase of Ca2+ fluorescence in HEK293 cells expressing GluK2

See Alt et al., 2004 for methodology and protocol
CNQX: Scientist Approved
CNQX product vial image | Hello Bio

Biological Data

Biological description

Potent and competitive AMPA and kainate receptor antagonist. Also antagonises NMDA receptors at the glycine site. Increases GABAA receptor spontaneous postsynaptic currents (sPSCs). Shows neuroprotective actions. Water soluble, CNQX disodium salt also available.

Application notes

The AMPA receptor antagonist CNQX is commonly used at concentrations of 10 μM to inhibit the actions of glutamate acting on AMPARs.

CNQX from Hello Bio reduces both spontaneous and evoked EPSCs in cortical neurons at concentrations of 1 μM with full AMPA receptor blockade at 10 μM (see Fig 1 above).


#Protocol 1: Evoked and spontaneous excitatory post synaptic currents (EPSCs)

  • Whole cell voltage clamp recordings were obtained from layer V neurons of the mouse prelimbic cortex brain slice.
  • EPSCs were evoked via a stimulating electrode placed in layers II/III delivering a single square (150 μs) pulse every 10 sec at an intensity that gave a reliable EPSC.
  • Neurons were held at -70 to -60 mV (the reversal potential of GABA currents). EPSCs were continuously stimulated and recorded in response to 5 min applications of varying concentrations of CNQX until complete receptor inhibition.
  • Spontaneous EPSCs were recorded before and after addition of CNQX by holding the neuron at -70 mV and recording for 10 sec.
  • Recordings for EPSCs were made in the absence of GABAA-R antagonists.

Solubility & Handling

Storage instructions Room temperature
Solubility overview Soluble in DMSO (100mM)
Important This product is for RESEARCH USE ONLY and is not intended for therapeutic or diagnostic use. Not for human or veterinary use.



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Chemical Data

Purity >98%
Chemical name 6-Cyano-7-nitroquinoxaline-2,3-dione
Molecular Weight 232.16
Chemical structure CNQX  [115066-14-3] Chemical Structure
Molecular Formula C9H4N4O4
CAS Number 115066-14-3
PubChem identifier 3721046
SMILES C1=C(C(=CC2=C1NC(=O)C(=O)N2)[N+](=O)[O-])C#N
Source Synthetic
InChi InChI=1S/C9H4N4O4/c10-3-4-1-5-6(2-7(4)13(16)17)12-9(15)8(14)11-5/h1-2H,(H,11,14)(H,12,15)
MDL number MFCD00069232
Appearance Yellow solid

References for CNQX

References are publications that support the biological activity of the product
  • Dop neuron glutamate cotransmission evokes a delayed excitation in lateral dorsal striatal cholinergic interneurons

    Chuhma et al (2018) eLIFE 7:e39786 : DOI: 10.7554/eLife.39786
  • The calpain inhibitor MDL-28170 and the AMPA/KA receptor antagonist CNQX inhibit neurofilament degradation and enhance neuronal survival in kainic acid-treated hippocampal slice cultures.

    Lopez-Picon FR et al (2006) Eur J Neurosci 23(10) : 2686-94.
  • 6-Cyano-7-nitroquinoxaline-2,3-dione (CNQX) increases GABAA receptor-mediated spontaneous postsynaptic currents in the dentate granule cells of rat hippocampal slices.

    Hashimoto Y et al (2004) Neurosci Lett 358(1) : 33-6.
  • Pharmacological characterization of glutamatergic agonists and antagonists at recombinant human homomeric and heteromeric kainate receptors in vitro.

    Alt et al (2004) Neuropharmacology 46(6) : 793-806
  • 6,7-Dinitro-quinoxaline-2,3-dion and 6-nitro,7-cyano-quinoxaline-2,3-dion antagonise responses to NMDA in the rat spinal cord via an action at the strychnine-insensitive glycine receptor.

    Birch PJ et al (1988) Eur J Pharmacol 156(1) : 177-80.

5 Item(s)

These publications cite the use of CNQX purchased from Hello Bio:
  • The dopamine neuron synaptic map in the striatum.

    Chuhma N et al (2023) Cell reports 42 : 112204
    PubMedID: 36867530
  • Transient developmental increase in cortical projections to amygdala GABAergic neurons contribute to circuit dysfunction following early life stress

    Lauri et al (2022) Biorxiv : https://doi.org/10.1101/2022.04.21.489031
  • Impact of Noise and Spike Initiation Properties on the Encoding and Transmission of Neural Information

    Ezabadi et al (2022) University of Toronto : Thesis
  • Inhibitory inputs to an inhibitory interneuron: Spontaneous postsynaptic currents and GABAA receptors of A17 amacrine cells in the rat retina

    Beltran-Matas P et al (2022) Eur J Neurosci 55(6) : 1442-1470
    PubMedID: 35236011
  • Activation of TRPC1 Channel by Metabotropic Glutamate Receptor mGluR5 Modulates Synaptic Plasticity and Spatial Working Memory

    Lepennetier et al (2018) Front. Cell. Neurosci. https://doi.org/ : 10.3389/fncel.2018.00318

Items 1 to 5 of 7 total