Optimisation of extraction conditions for polysaccharides from the roots of Isatis tinctoria L. by response surface methodology and their in vitro free radicals scavenging activities and effects on IL-4 and IFN-γ mRNA expression in chicken lymphocytes

- RSM was firstly applied to optimize the extraction conditions for IRPS.
- Enhancing effect of IRPS on chicken lymphocytes was investigated.
- Besides, their in vitro ABTS radicals scavenging activities were also investigated.