Fig. 6.

Oral exposure to SiO₂NPs partially affected the activities of intestinal digestive enzymes and immune functions. After indicate treatment, the effects of SiO₂NPs on the activities of typical digestive enzymes, including sucrase, lactase, maltase, alkaline phosphatase and γ-glutamyl transferase were shown in (A–E). F Effects of SiO₂NPs on the levels of sIgA in the gut tissues were detected using ELISA assay. G Effects of SiO₂NPs on the DAO contents were determined by ELISA. Data were reported as mean ± S.E.M. Statistical analysis was performed by using independent student-t test. Asterisk * indicated P < 0.05