[Determination of chlorinated hydrocarbons in coffee beans].
Chlorinated hydrocarbons (gamma-HCH, DDT and their analogous metabolites) were determined in coffee beans. Four sorts of green coffee beans and 18 sorts of burnt coffee beans were used in the research. The method was based on extraction of fat and its destruction with concentrated sulphuric acid. Chlorinated hydrocarbons were extracted with n-hexane, separated and quantitatively determined by gas chromatography. The presence of chlorinated hydrocarbons was detected in green coffee beans and, in smaller quantities, in burnt coffee beans. The concentration of chlorinated hydrocarbons was lower in medium and darkly burnt coffee beans than lightly burnt coffee. The level of DDT and its metabolites in final product decreased after coffee burning at higher temperatures. After brewing the grind coffee beans the remains of chlorinated hydrocarbons were detected in coffee-grounds at concentration to those found in coffee beans. Drinking of natural coffee does not influence an increase of intake the chlorinated hydrocarbons by human beings.
Wieczorek
Jolanta
J
Instytut Towaroznawstwa i Oceny Jakości Zywności, Uniwersytet Warmińsko-Mazurski w Olsztynie 10-957 Olsztyn, Pl. Cieszyński 1.
Czyrska
Regina
R
Wieczorek
Zbigniew
Z
Smoczyńska
Krystyna
K
D003069:Coffee / Q000737:chemistry* / Q000145:classification; D003634:DDT / Q000302:isolation & purification; D006358:Hot Temperature; D006843:Hydrocarbons, Chlorinated / Q000302:isolation & purification*
D003069:Coffee; D006843:Hydrocarbons, Chlorinated; D003634:DDT