Abstract:The purpose of this paper was to study the effect of ultra-high pressure treatment on the quality and protein oxidation of Argopecten irradians adductor muscle at 4℃.The fresh samples of A.irradians adductor muscle were stored at-18 ℃ as the control，and other samples of A.irradians adductor muscle were treated with ultra-high pressure（600MPa/5min）and placed at 4 ℃.During the storage，aerobic bacteria count，total volatile basic nitrogen（TVB-N）content，color，carbonyl content and total and reactive sulfhydryl content of myofibrillar protein，and sodium dodecyl sulfate polyacrylamide gel electrophoresis（SDS-PAGE）of A.irradians adductor muscle were determined to investigate the preservation effect of ultra-high pressure on chill storage of A.irradians adductor muscle.The results showed that the aerobic bacteria count and TVB-N content of samples in the control group and the treated group were still within the specified limit after 90 d of storage，and the total color differences（ΔE*）were 7.48 and 25.38，respectively.With the extension of storage time，the carbonyl content in the two groups increased by 9.58 nmol/mg and 9.16 nmol/mg，respectively，whereas the total and reactive sulfhydryl content decreased.In the two groups，the total sulfhydryl content decreased by 10.62 mmol/100 g and 8.60 mmol/100 g，and the reactive sulfhydryl content decreased by 4.73 mmol/100 g and 8.51 mmol/100 g.The results of SDS-PAGE showed that the myofibrillar proteins of samples in the two groups were both degraded during storage.