Abstract
The traditional drying method of Camellia oleifera seeds is sun drying and shade drying. In order to further improve the oil content and production efficiency, light and no light treatment were carried out and the oil quality was compared. The results show that the oil contents of these seeds (light treatment, 37.17 ± 0.68%; no light, 36.15 ± 0.57%) were higher than those obtained from sun-dried (33.15 ± 1.23%) or shade-dried (34.29 ± 0.86%) seeds. Increased oil content after light and no-light treatment was attributed to saturated fatty acids and linoleic acid. Squalene content was 2.82–3.68 times higher than that in Camellia oleifera seed oil treated by sun drying and shade drying. Principal component analysis ranking of the comprehensive score was: sun-dried > no-light-treated > light-treated > shade-dried. Heatmap analysis showed two categories of [sun drying + shade drying] and [light treatment + no-light treatment]. Random forest analysis showed that the strongest factors on seed oil quality were: Δ-7-stigmasterol, α-tocopherol, and β-tocopherol.
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