Center for Viticulture & Enology, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
Beijing Food Industrial Research Institute, Beijing 100075, China.
Molecules. 2020 Jan 30;25(3):608. doi: 10.3390/molecules25030608.
Air- and sun-dried raisins from Thompson Seedless (TS) grapes were analyzed under GC/MS to evaluate fatty acids (FAs) and their derived volatile compounds, coming from unsaturated fatty acids oxidation. A total of 16 FAs were identified in TS raisins, including 10 saturated fatty acids (SFAs) and 6 unsaturated fatty acids (USFAs). The contents of C18:0, C15:0, and C16:0 among SFAs and C18:3, C18:2 and C18:1 in USFAs were significantly higher. Furthermore, USFAs such as C16:1 and C20:1 were only identified in air-dried raisins. The principal component analysis showed the increased content of FAs and FA-derived compounds were in air-dried and sun-dried raisins, respectively. Among FA-derived compounds, 2-pentyl furan, 3-octen-2-one, 1-hexanol and heptanoic acid were more potent. This study shows that air-drying is more favorable for the production of fatty acids (SFAs and USFAs), whereas sun-drying is more advantageous in terms of fatty acid-derived volatiles.
无籽葡萄干（Thompson Seedless，TS）经空气干燥和阳光干燥后，采用 GC/MS 进行分析，以评估来自不饱和脂肪酸氧化的脂肪酸（FAs）及其衍生的挥发性化合物。TS 葡萄干中共鉴定出 16 种脂肪酸，包括 10 种饱和脂肪酸（SFAs）和 6 种不饱和脂肪酸（USFAs）。SFA 中的 C18:0、C15:0 和 C16:0 以及 USFA 中的 C18:3、C18:2 和 C18:1 含量较高。此外，空气干燥葡萄干中仅鉴定出 USFA 中的 C16:1 和 C20:1。主成分分析表明，空气干燥和阳光干燥葡萄干中 FAs 和 FA 衍生化合物的含量均增加。在 FA 衍生化合物中，2-戊基呋喃、3-辛烯-2-酮、1-己醇和庚酸的含量更高。本研究表明，空气干燥更有利于生产脂肪酸（SFA 和 USFA），而阳光干燥更有利于生产脂肪酸衍生的挥发性化合物。
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