A novel fructan from Atractylodes macrocephala ameliorates ulcerative colitis through gut microbiota-mediated PI3K/Akt signaling - Jiangping Wu; Qiangbao Xu; Yiping Yang; Zhu Yang; Zihan Li; Lingzhi Chen; Yujia Song; Hui Che; Guodong Wang; Qiuyue Lv; Jun Han (Carbohydrate Polymers, 2026)