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Radiolysis of aqueous and aqueous-ethanolic solutions of histamine

✍ Scribed by J. Kopoldová; V. Vlasáková

Publisher
John Wiley and Sons
Year
1984
Tongue
French
Weight
333 KB
Volume
21
Category
Article
ISSN
0022-2135

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✦ Synopsis

Abstract

Aqueous solutions of histamine and imidazole were gamma‐irradiated in the absence and presence of ethanol. The protective effect of ethanol on the radiation cleavage of the imidazole ring depends on the pH of irradiated solutions: at neutral pH the presence of ethanol decreases radiation degradation of imidazole skeleton whereas at acidic pH it does not play any protective role. On the contrary in irradiated aqueous‐ethanolic solutions of histamine 2 HCl (pH 4.5) some additional reactions between histamine and products of radiolysis of ethanol, mainly with acetaldehyde, take place leading to the increase of total radiation loss of histamine and to the formation of further radiation products. Similar products were also found in ^3^H preparations of histamine stored in aqueous‐ethanolic solutions. Possible mechanisms of radiation degradation of histamine were discussed.

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