The Changes of Benzo[α]pyrene in Herbal Teas containing Astragalus membranaceus, Schizandra chinensis, Liriope platyphylla and Platycodon grandiflorum Which are affected by the Puffing Conditions

Abstract

The following study is the result of herbal teas puffed at different temperatures between 140~220℃. Depending on treatment temperatures, the water contents decreased, while some carbonization occurred and crude ash contents relatively increased. Also, the crude protein and crude fat experienced little changes. B(α)P contents (0.16~0.17 ppb) showed little change according to treatment temperatures. From this result, the B(α)P content differed depending on the treatment temperature and raw materials. Solid elution rate figures of the herbal teas ranged from 0.27~0.45% (w/w) and the rate of solid elution increased along with higher puffing temperatures. The reason for the increase in solid elution rates is due to the breakage of cross bridges between the raw materials in the herbal tea which are carbohydrates, proteins, lipids and etc. after treatments of physical changes rather than chemical ones.