关键词: 南美白对虾；风味品质；电子鼻；气相色谱-离子迁移谱；偏最小二乘判别分析

Abstract: To investigate the changes in the volatile flavor compounds and the characteristic components responsible for flavor deterioration in the muscle of Litopenaeus vannamei under cold storage, the odor profiles of shrimp stored at 4 ℃ for 0–4 days were quantitatively and qualitatively analyzed using an electronic nose and headspace-gas chromatography-ion mobility spectrometry (HS-GC-IMS). Key flavor compounds were selected based on their relative odor activity values (ROAVs), and differential compounds were analyzed using a partial least squares discriminant analysis (PLS-DA) model. The results showed that the electronic nose sensors W1W, W6S, and W3C exhibited the strongest responses and HS-GC-IMS identified 14 volatile flavor compounds, with aldehydes, ketones, pyrazines, and sulfur-containing compounds markedly accumulating in the late storage period. PLS-DA highlighted abhexone, safranal, acetone, and pentan-1-ol as key volatile compounds. These findings reveal key chemical components contributing to flavor deterioration in cold-stored shrimp, providing a scientific basis for understanding the mechanism of flavor deterioration and developing targeted control strategies.

Key words: Litopenaeus vannamei; flavor quality; electronic nose; gas chromatography-ion mobility spectrometry; partial least squares discriminant analysis