Abstract: Compares the effect to block nitrosamin synthesis of extraction of ginkgo leaf with different extractant under the conditions that the solid-to-liquid ratio is 1∶10, extracting temperature is 80℃, extracting time is 60 mins, studies the blocking effect to nitrosamin synthesis and clearance effect to sodium nitrite of ginkgo leaf active material with different concentration extracted by 55％ acetone. The results show the suitable extractant is 55％ acetone, the extraction has relative high function to block nitrosamin synthesis and to clear sodium nitrite. When the solid content is 43.60 mg／mL, the blocking ability to nitrosamin systhesis of ginkgo leaf is 73.02％, and the clearance rate to sodium nitrite is 75.92％.

Key words: ginkgo leaf, sodium nitrite, nitrosamin, disconnecting, scavenging