PTIO (=2-Phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl) [Stable free radical reagent for the simultaneous determination of NO and NO2 in the atmosphere] TCI A5440

Chemical Identity

Other names: PTIO
CAS No.: 18390-00-6
PubChem: CID 2733513·SID 87563150
Formula: C13H17N2O2
Molecular weight: 233.29 g/mol
Purity: >98.0%(T)

Full identifiers (IUPAC, SMILES, InChIKey)

SMILES: CC1(C([N+](=C(N1[O])C2=CC=CC=C2)[O-])(C)C)C
InChIKey: DYUUGILMVYJEHY-UHFFFAOYSA-N

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TCI A5440, also known as PTIO (2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl), is a stable free radical reagent widely used in environmental and analytical chemistry for the simultaneous detection of nitrogen monoxide (NO) and nitrogen dioxide (NO₂) in the atmosphere. This compound plays a crucial role in laboratory settings where accurate and reliable measurement of trace gases is essential. It is particularly valuable for monitoring air quality and assessing environmental pollution levels. Its unique chemical properties allow it to interact selectively with these gases, making it an indispensable tool for researchers and environmental scientists.

The stability and reactivity of PTIO make it a preferred choice for analytical applications. It maintains its chemical integrity under various conditions, ensuring consistent and reproducible results. Its high sensitivity and specificity enable precise quantification of NO and NO₂, even at low concentrations. Additionally, PTIO does not react with other atmospheric compounds, minimizing interference and enhancing the accuracy of measurements. These characteristics make it a reliable and efficient reagent for both qualitative and quantitative analysis in laboratory environments.

In Indonesian laboratories, PTIO is commonly used in environmental studies, air quality assessments, and public health research. It is particularly relevant for monitoring urban and industrial air pollution, supporting evidence-based environmental policies. Its application in these contexts ensures that scientific data can be used to inform decisions related to pollution control and public health initiatives. The compound’s reliability and performance make it a key component in the analytical toolkit of Indonesian research institutions.

Advantages (TCI brochure)

Spin trap agent that selectively oxidizes NO
Converts NO to NO2

TCI brochures (PDF)

Organic Radical Magnets 2024-11-27 · p. 1
Reactive Oxygen Species (ROS) and Oxidative Stress Research Reagents 2026-04-23 · p. 1
Reagents for Biological Research 2025-03-11 · p. 36

Related TCI products

Environmental Monitoring for detecting NO and NO₂ levels in urban and industrial areas, ensuring accurate data for pollution control strategies.
Air Quality Assessment to evaluate atmospheric composition and identify sources of nitrogen oxides, supporting regulatory compliance.
Public Health Research for studying the impact of air pollution on respiratory health, providing critical data for health policy development.
Atmospheric Chemistry Studies to analyze the behavior of nitrogen oxides in the environment, contributing to climate and environmental science.
Industrial Emissions Testing to measure and monitor emissions from factories and power plants, aiding in environmental impact assessments.

From the TCI brochure

NO concentration determined from the ESR spectrum of PTIO and PTI

Brand	TCI
CAS number	18390-00-6
Molecular formula	—
Purity	—
Category	Materials Science > Magnetic Materials > Organic Radicals
Pack sizes	—
Physical form	—
Storage	Store in a cool, dry place away from light and incompatible materials

PTIO should be stored in a cool, dry environment, away from direct sunlight and sources of heat. It is recommended to keep the reagent in a tightly sealed container to prevent exposure to air and moisture. Due to its chemical nature, it should be handled with care, using appropriate personal protective equipment such as gloves and safety goggles. Avoid contact with incompatible substances to ensure stability and safety. In laboratory settings, PTIO should be stored in a designated chemical storage area that complies with standard safety protocols. Proper labeling and documentation are essential to maintain a safe and organized laboratory environment.

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