Extraction, isolation and identification of four phenolic compounds from Pleioblastus amarus shoots and their antioxidant and anti-inflammatory properties in vitro

•Four phenolic compounds of the shoots of Pleioblastus amarus were isolated and identified for the first time.•All the four compounds showed significant antioxidant capacity.•Compound 2 (3-O-feruloyquinic acid) had strongest antioxidant capacity, but was unstable.•Compound 2 inhibit IL-6, 1L-1β, iNOS, COX-2 and NF-κB production by RAW264.7 cells.