研究水产品为主要贮藏原料的模拟低温冷库(-20℃)中异味物质组成和臭氧对其清除效果,采用顶空固相微萃取结合气相色谱-质谱联用技术和主成分分析法对其进行统计分析.结果表明,在5个模拟低温冷库中检测出异味物质142种,其中链类44种、芳香烃29种、酯类20种、醇类12种、胺类10种、醛类8种、酮类7种、酸类5种、其他类7种.主成分分析结果表明,前4个主成分因子的累积贡献率高达100％,囊括了全部变量的信息.随着臭氧浓度的增加和作用时间的延长,-20℃模拟低温冷库中单体异味物质的含量逐渐降低,其中小分子物质含量下降较快,大分子物质含量下降较慢,芳香烃、链烃、醛类下降比例较大,酸类、酮类化合物则有增加的趋势.对-20℃模拟冷库而言,选择200×10-6～300×10-6的臭氧浓度作用2.5～3.0 h比较合适.%To measure odor compositions in the simulated cold storages of aquatic products (-20 ℃ and the deodorization efficiency of ozone.The odor compositions in the simulated cold storages of aquatic products (-20 ℃) are measured by solid-phase microextraction-gas chromatograph-mass spectrometer (SPEM-GC-MS) and analyzed by principal component analysis (PCA).142 kinds of odor substances are detected in the simulated cold storage of-20 ℃.Including 44 chain hydrocarbon,29 aromatic hydrocarbon,20 esters,12 alcohols,10 amine,8 ketones,7 aldehyde,5 acids and 7 other classes.PCA analysis found that the cumulative contribution rate for the first four principal components factors reached up to 100％,indicating that the odor components are highly correlated in the different simulated cold storages of aquatic products.The deodorization efficiency of ozone is also evaluated ozone exhibited a positive effect on odor elimination in time and dose-dependent manner under all tested cold storages.The content of small molecules decreased rapidly while that of large molecule decreased relatively slow.Aromatic hydrocarbon,chain hydrocarbon and aldehyde reduce in large scale while acids and ketone compounds showed an increasing trend.The optimal ozone concentration and treatment time are 200 × 10-6～300 × 10-6 2.5～3.0 h for-20 ℃ storage tank,respectively.
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