IBOTENIC ACID Chemische Eigenschaften,Einsatz,Produktion Methoden
R-S?tze Betriebsanweisung:
R23/24/25:Giftig beim Einatmen, Verschlucken und Berührung mit der Haut.
R25:Giftig beim Verschlucken.
R40:Verdacht auf krebserzeugende Wirkung.
S-S?tze Betriebsanweisung:
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn m?glich, dieses Etikett vorzeigen).
S38:Bei unzureichender Belüftung Atemschutzger?t anlegen.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S22:Staub nicht einatmen.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Chemische Eigenschaften
Crystalline solid; forms monohydrate; mp151°C (303.8°F) (anhydrous), 145°C (293°F)(monohydrate); soluble in water and alcohol.
Verwenden
Ibotenic acid is a neuroexcitatory amino acid originally isolated from Amanita species that functions as a NMDA and metabotropic glutamate receptor agonist. As a neurotoxin, ibotenic acid is often used to induce brain lesions in animals that model cognitive dysfunctions resulting from neurodegenerative diseases, traumatic brain injury, and stroke.
Definition
A isoxazole which, together with muscimol, is largely responsible for the toxicities of a number of mushrooms including those of the genus Amanita. It is a potent excitatory amino acid.
synthetische
Isolated from the Japanese fly mushroom. The acid can be produced synthetically.
Hazard
Neurotoxic; causes motor depression, ataxia, changes in mood, perceptions and feelings.
Health Hazard
Ibotenic acid is a potent neurologic aminoacid. It exhibits neuroexcitatory activity andcauses sedative actions on spinal neurons.High doses can cause sleep, hallucinations,distorted perceptions, and nausea. In humansthe symptoms above may be manifested fromingestion of 6–8 mg of ibotenic acid.
LD50 value, oral (mice): 38 mg/kg
LD50 value, intraperitoneal (mice): 15 mg/kg.
Biologische Aktivit?t
NMDA and metabotropic glutamate receptor agonist.
l?uterung methode
It has been converted to the ammonium salt (m 121-123o dec) dissolved in H2O, passed through an Amberlite IR 120 resin (H+ form) and eluted with H2O. The acidic fractions are collected, evaporated to dryness and the residue recrystallises from H2O as the monohydrate (m 144-146o). The anhydrous acid is obtained by making a slurry with MeOH, decanting and evaporating to dryness, and repeating the process twice more to give the anhydrous acid (m 151-152o). Recrystallisation from H2O gives the monohydrate. [Nakamura Chem Pharm Bull Jpn 19 46 1971.] The ethyl ester forms needles when crystallised from a small volume of Et2O and has m 78-79o and IR (CHCl3) with
max 35002300 (OH), 1742 (ester C=O), 1628, 1528cm-1, and UV with λmax (EtOH) at 206nm (ε 7,080).
The hydrazide has m 174-175o (from MeOH) with IR (KBr) 1656 (C=O)cm-1.
IBOTENIC ACID Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte