Highlights
• Peptides in walnut dreg proteins are efficiently released by alcalase.
• Alcalase hydrolysate (Al-WPH) inhibits cyclooxygenase-2 (COX-2) activity.
• Four novel peptides (AGFP, FPGA, LFPD, and VGFP) were identified in Al-WPH.
• AGFP, FPGA, LFPD, and VGFP showed potential COX-2 inhibitory activity.
• Walnut dreg protein is an excellent low-cost source of anti-inflammatory peptides.