2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:
Pricing and availability is not currently available.

Quality Level

storage temp.


SMILES string




InChI key



2-phenyl-4, 4, 5, 5,-tetramethylimidazoline-1-oxyl 3-oxide (PTIO) has been used as a nitric oxide (NO) scavenger.


25, 100 mg in poly bottle

Biochem/physiol Actions

A stable radical scavenger for nitric oxide; affects NO without affecting NO synthase; has significant inhibitory activity against NO biological actions.
2-phenyl-4, 4, 5, 5,-tetramethylimidazoline-1-oxyl 3-oxide (PTIOs) derivatives react with nitric oxide (NO) to yield the corresponding imino nitroxides (PTIs) and nitrogen dioxide (NO2).

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Hazard Codes


Risk Statement


Safety Statement



NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
Victoria P A Johnstone et al.
Learning & memory (Cold Spring Harbor, N.Y.), 18(10), 625-633 (2011-09-22)
Long-term potentiation (LTP) is an important process underlying learning and memory in the brain. At CA3-CA1 synapses in the hippocampus, three discrete forms of LTP (LTP1, 2, and 3) can be differentiated on the basis of maintenance and induction mechanisms....
Victor Parro et al.
Frontiers in microbiology, 10, 929-929 (2019-05-28)
Potential benthic habitats of early Mars lakes, probably oligotrophic, could range from hydrothermal to cold sediments. Dynamic processes in the water column (such as turbidity or UV penetration) as well as in the benthic bed (temperature gradients, turbation, or sedimentation...
Reactions of PTIO and carboxy-PTIO with *NO, *NO2, and O2-*.
Goldstein S
The Journal of Biological Chemistry, 278 (51), 50949-50955 (2003)
Jiu-Gang Xue et al.
Journal of neurophysiology, 105(6), 2897-2906 (2011-04-08)
N-methyl-D-aspartate (NMDA) receptors (NMDARs) are implicated in synaptic plasticity and modulation of glutamatergic excitatory transmission. Effect of NMDAR activation on inhibitory GABAergic transmission remains largely unknown. Here, we report that a brief application of NMDA could induce two distinct actions...
Christal G Coleman et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 30(36), 12103-12112 (2010-09-10)
Chronic intermittent hypoxia (CIH) is a concomitant of sleep apnea that produces a slowly developing chemosensory-dependent blood pressure elevation ascribed in part to NMDA receptor-dependent plasticity and reduced nitric oxide (NO) signaling in the carotid body. The hypothalamic paraventricular nucleus...

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