4-ヒドロキシ-2,2,6,6-テトラメチルピペリジン1-オキシル フリーラジカル

外観

黄赤色、結晶～結晶性粉末

溶解性

水、エタノール及びアセトンに溶ける。

用途

生体試料のESRスピンラベル化試薬。

用途

TEMPOL（テンポル）正式名称は4-ヒドロキシ-2,2,6,6-テトラメチルピペリジン-1-オキシルという。 TEMPOと同様に、安定なラジカルとして酸化剤や触媒に使われる。TEMPOLの利点はTEMPOに比べて非常に価格が安いことである。TEMPOLはアンモニアとアセトンを濃縮して作られるトリアセトンアミンから合成される。値段が安いため、産業用としても利用されている。 医薬品では、活性酸素の分解を促進する物質となる。TEMPOLは超酸化物の不均化を触媒し、過酸化水素の代謝を促進し、フェントン試薬の体内での発生を抑えるはたらきがある。

使用上の注意

開封後は直ちに窒素を封入して下さい。不活性ガス封入

説明

TEMPOL is a piperidine nitroxide and spin label with superoxide dismutase (SOD) mimetic activity. It inhibits lipid peroxidation in rat liver microsomes with 50% inhibition of microsomal lipid peroxidation (IP₅₀) values of 117, 61, and 381 μM for peroxidation induced by iron plus NADPH, iron plus ascorbate, and t-butylhydroperoxide, respectively. TEMPOL (1 mM) inhibits production of superoxide anions by 92% via a xanthine-xanthine oxidase reaction in vitro. It reduces mean arterial pressure and heart rate in spontaneously hypertensive rats (ED₅₀s = 70 and 63 μmol/kg, respectively) when administered intravenously. TEMPOL is a cell-permeable spin label that has been used to quantify intracellular oxygen in various cell types by electron spin resonance (ESR) spectroscopy.

化学的特性

solid

使用

A free radical scavenger

主な応用

In biochemical research, 4-hydroxy-TEMPO has been investigated as an agent for limiting reactive oxygen species.  It catalyzes the disproportionation of superoxide, facilitates hydrogen peroxide metabolism, and inhibits Fenton chemistry.4-Hydroxy-TEMPO, along with related nitroxides, are being studied for their potential antioxidant properties.On an industrial-scale 4-hydroxy-TEMPO is often present as a structural element in hindered amine light stabilizers, which are commonly used stabilizers in plastics, it is also used as a polymerisation inhibitor, particularly during the purification of styrene. 

一般的な説明

4-Hydroxy-TEMPO is a 4-substituted 2,2,6,6-tetramethylpiperidyl-1-oxy (TEMPO) derivative. It is a low-molecular weight compound and has been proposed as superoxide dismutase mimic.

生物活性

Superoxide scavenger that displays neuroprotective, anti-inflammatory and analgesic effects.