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论文应用1H-NMR研究了葵花籽油65℃贮藏过程中氧化产物(共轭烯、醛类、氧化物、芳香烃、游离酸相对含量)的变化规律,并与低场核磁共振(LF-NMR)弛豫特性中的S21的变化进行了相关性分析。1H-NMR结果表明,在65℃贮藏过程中,油样的初级氧化产物随贮藏时间的延长呈先增加后减小的趋势,与氢过氧化物相比,氢过氧化物-共轭二烯优先降解;次级氧化产物及水解产物如醛、环氧化物、游离脂肪酸等随贮藏时间呈良好指数关系(R2>0.96),芳香烃则随贮藏时间呈先增加后减小的趋势。而LF-NMR检测所得到的油样的S21随贮藏时间延长呈良好的指数增加趋势(R2=0.99)。相关性分析表明,氧化物、游离脂肪酸与S21的相关性最高,模型验证合理可靠。该结果可为研究S21特征峰的表征物质、提高LF-NMR油脂品质判别率提供研究参考及有益思路。
In this paper, the changes of the oxidation products (conjugated ene, aldehydes, oxides, aromatic hydrocarbons, free acid relative content) of sunflower seed oil during storage at 65 ℃ were studied by 1H-NMR. ) Relaxation characteristics of S21 in the correlation analysis. The results of 1H-NMR showed that the primary oxidation products of the samples increased first and then decreased with the extension of storage time at 65 ℃. Compared with the hydroperoxides, the hydroperoxide-conjugated dienes (R2> 0.96). The aromatics first increased and then decreased with the increase of storage time. However, the S21 of oil sample obtained by LF-NMR showed a good exponential increasing trend with storage time (R2 = 0.99). Correlation analysis showed that oxide and free fatty acid had the highest correlation with S21, and the model validation was reasonable and reliable. The results provide a research reference and beneficial ideas for studying the characterization of S21 characteristic peak and improving the discrimination of LF-NMR oil quality.