Objective To screen the Nitric Oxide (NO) decompression fumigation treatment concentration suitable for regulating the oxidative rackness of walnut.

Methods In this study 'Wen185' thin-skinned walnut was taken as the test material with 600, 900, 1200 μL/L NO fumigation concentration as the treatment group, and non-decompression fumigation as the control group (CK). Then the influence of NO fumigation treatment on the indexes related to oxidation rancidity during storage at room temperature was analyzed.

Results The results showed that: Compared with CK, NO vacuum fumigation treatment had a certain inhibition effect on the oxidative rackness of 'Wen 185' thin bark walnut, among which 900 μL/L NO vacuum fumigation treatment had the most obvious effect, which could significantly inhibit the increase of acid value, peroxide value and saponification value during storage at room temperature, and keep the malondialdehyde content, anisidine value and conjugated diene value low, thus maintaining better sensory quality.

Conclusion The findings provide a scientific basis for the application and popularization of the control technology of oxidative rancidity in walnut production.