Influence of fluoride on activity of carboxylesterase and esterase in hemolymph of Bombyx mori

We explored the metabolic mechanism of silkworm (Bombyx mori) to NaF by using the fluoride-tolerant silkworm variety named T6 and the fluoride-sensitive variety named 734 as materials. We fed the silkworm larvae from the first day of fifth instar with mulberry leaves soaked in 50, 100, 200 and 400 mg/kg NaF solutions respectively. Then we examined the activities of CarE and esterase in hemolymph. Results showed that the activity of CarE was 73% to 88% in 734 strain and 72% to 81% in T6 strain compared with control groups, respectively. The CarE activity of two low concentration NaF-treated 734 groups showed extremely significant differences(P