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http://dx.doi.org/10.12925/jkocs.2013.30.4.790

The Changes of Benzo[${\alpha}$]pyrene Content in Herbal Tea Containing Schizandra chinensis, Astragalus membranaceus, Platycodon grandiflorum and Liriope platyphylla Affected by Roasting Temperature  

Jang, Gi-Hwa (Dept. of Foodservice & Culinary management, Kyonggi University)
Song, Soo-Ik (Dept. of Culinary Art, Daewon University College)
Oh, Sung-Cheon (Dept. of Food & Pharmacy, Daewon University College)
Publication Information
Journal of the Korean Applied Science and Technology / v.30, no.4, 2013 , pp. 790-796 More about this Journal
Abstract
The following is the study result of herbal tea roasted at different temperatures between $80{\sim}140^{\circ}C$. Depending on treatment temperature the water content decreased, some carbonization occurred and crude ash content relatively increased. Also crude protein and crude fat changed little. Benzopyrene content (0.17~0.35ppb) showed a tendency to increase with higher treating temperature. From this result, the $B({\alpha})P$ content differed depending on the treatment temperature and raw materials. In case of roasting, the actual inside temperature is around $200^{\circ}C$ but since the surface temperature of the roaster reaches around $2,000^{\circ}C$ some portion of $B({\alpha})P$ content was presumed to be produced from the area that came in contact with this surface. Solid elution rate of herbal tea showed 0.18~0.35%(w/w) and the rate of solid elution decreased with higher roasting temperature. There was no big change in $80{\sim}110^{\circ}C$ treatment section but the solid elution decreased rapidly in $110{\sim}140^{\circ}C$ section. The reason for decreasing solid elution rate at higher treatment temperature is because the compact inner tissue makes elution difficult.
Keywords
benzo[${\alpha}$]pyrene; roasting; herbal tea; polycyclicaromatichydrocarbons;
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