A methanol extract of the fruits, 0.1 mg/ml, did not suppress interleukin- 8 induction in lipopolysaccharide-activated rat macrophages in vitro (32). A polysaccharide isolated from an aqueous extract of the fruits, Ziziphusarabinan, 500.0 μg/ml, had anti-complementary activity in human serum in vitro (27). Both the n-butanol and diethyl ether extracts of the seeds exhibited anti-inflammatory activity in vitro as assessed by the albuminstabilizing assay (33).