2,5-диметилпиразин

Химические свойства

clear colorless to pale yellow liquid

Вхождение

Reported to be present in bakery products, roasted barley, cocoa products, roasted coffee, dairy products, pork, peanuts, pecans, filberts, popcorn, potato products, rum and whiskey, soy products; a volatile component in roasted filberts and in potato chips; reportedly identified in the fat of cooked beef; also reported found in toasted off-flavors. Also reported in cheeses, butter, boiled eggs, grilled beef, tea, barley, oats, oatmeal, soybeans, heated beans, kohlrabi, shrimp and mushrooms. Also reported found in coffee, potato chips and shrimp

Использование

2,5-Dimethyl pyrazine is used for blending food, nuts and beverage flavors.

прикладной

2,5-Dimethyl pyrazine is held chiefly responsible for the typical flavor of Potato Chips (oil-fried, thin-sliced Potato). It has therefore been manufactured synthetically and is used in the reconditioning of commercial products, such as Potato Chips and the packaging material for same, and also for reconditioning of "instant" coffee.

Подготовка

By the interaction of acrolein and ammonia when heated in glycerol in the presence of ammonium salts; by self-condensation of aminoacetone, followed by oxidation with mercury chloride.

Общее описание

2,5-Dimethylpyrazine is a pyrazine compound that is mainly formed in food products such as cooked rice or roasted peanuts due to the Maillard reaction between sugars and proteins during cooking or roasting process.

Профиль безопасности

Moderately toxic by ingestion and intraperitoneal routes. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx

Методы очистки

Purify it via its picrate (m 150o) which is decomposed with a base (e,g, KOH) and distilled. [Wiggins and Wise J Chem Soc 4780 1956]. [Beilstein 23/5 V 403.]