Identification of Volatile Oxidation Compounds as Potential Markers of Walnut Oil Quality.
Identification of Volatile Oxidation Compounds as Potential Markers of Walnut Oil Quality.
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鉴定挥发性氧化化合物作为核桃油质量的潜在标志。
DOI：
10.1111/1750-3841.14342
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发表时间：
2018
影响因子：
3.9
通讯作者：
D. Pei
中科院分区：
文献类型：
--
作者：
Ye Zhou;Wei Fan;F. Chu;Chengzhang Wang;D. Pei
在60 °C加速贮藏10 d的条件下，研究了3个核桃品种（cvs.三台、香菱、清香）。在所有油样中鉴定出18种挥发性氧化化合物，包括3种醇、11种醛、1种呋喃、1种酮和2种酸。结果表明，2-庚烯醛和1-辛烯-3-醇与过氧化值（PV）、对茴香胺值（p-AnV）和总生育酚残留量（Rtocos）的线性相关性最强。这两种化合物的含量也被证明是PV，p-AnV，和Rtocos的显着变量，根据刀切不确定性检验应用于偏最小二乘法分析。因此，2-庚烯醛和1-辛烯-3-醇可作为核桃油品质的潜在标记物。此外，辛醛和壬醛等油脂衍生物与多不饱和脂肪酸残留量（RPUFAs）的负相关性最强，可用于指示核桃油氧化过程中PUFAs的显著减少。实际应用：如今，核桃在中国已大规模种植。由于核桃中含油60%以上，开发核桃油具有重要意义。挥发物如醛是二次氧化产物。研究其种类和含量的动态变化有助于了解核桃油氧化过程。利用挥发性标记物对核桃油品质的测定也更方便和可预测。本研究为核桃油在线质量控制系统的开发提供了参考。
In this study, a 10-day accelerated storage at 60 °C was carried out to investigate the evolution of volatile profiles of walnut oils from three cultivars (cvs. Santai, Xiangling, Qingxiang). Eighteen volatile oxidation compounds, including three alcohols, 11 aldehydes, one furan, one ketone, and two acids, were identified in all oil samples. Data from the three cultivars were combined and the analysis showed that 2-heptenal and 1-octen-3-ol exhibited the strongest linear correlations with peroxide value (PV), p-anisidine value (p-AnV), and the residual content of total tocopherols (Rtocos ). The contents of both compounds were also proved to be significant variables for PV, p-AnV, and Rtocos , according to the jack-knife uncertainty test applied in partial least squares analysis. Hence, 2-heptenal and 1-octen-3-ol could be used as potential markers of walnut oil quality. Besides, the oleic-derived compounds such as octanal and nonanal were suggested to be used to indicate notable decrease of PUFAs during walnut oil oxidation, since they showed the strongest negative correlations with the residual content of PUFAs (RPUFAs ). PRACTICAL APPLICATION: Nowadays a large-scale planting of walnut has taken place in China. Since walnut contains more than 60% of oil, the development of walnut oil is of great significance. Volatiles such as aldehydes are secondary oxidation products. Study on the dynamic changes of their types and contents could be helpful to understand the process of walnut oil oxidation. The measurement of walnut oil quality could also be more convenient and predictable with the use of volatile markers. Hence, this research provides insights for the future development of online quality control system for walnut oil.