白花树种子成熟期含油率和脂肪酸变化规律

通过对白花树Styrax tonkinensis多年的观察，其果实成熟期一般在9-10月。为了探索白花树果实成熟期内脂肪酸和含油率的累积变化规律，自2011年8月中旬（10日）起至2011年10月下旬（21日），对标记的白花树果实定期取样（12 d次-1），共取7个批次。经过一系列处理后测定百粒质量、含油率和脂肪酸组成。结果表明:9月下旬（27日）至10月上旬（9日）是白花树果实和种子成熟的拐点时期，这段时期果壳开始干燥脱水，果实内含物迅速累积；随着果实和种子的成熟，饱和脂肪酸的相对含量逐渐下降，而不饱和脂肪酸除了亚油酸显著下降，其他脂肪酸相对含量均缓慢上升。这些结论对果实的采收时间和储藏方式有一定的理论指导意义。图3表2参14

Seed oil production rate and fatty acid content of Styrax tonkinensis during seed maturation

To determine variation in oil production rate and fatty acid content during the nut maturation period （between September and October） of Styrax tonkinensis，seven batches of nuts were collected from samples taken every 12 d from mid-August to late October. After a series of airing and peeling treatments，seeds obtained as a result of threshing were measured for seed hundred-grain weight，oil production rate，and fatty acid content. Results showed that the stage from September 27th to October 9th was the inflection point for nut and seed maturation due to strong variation in nut and seed characteristics. During this stage，nut shells began to dehydrate and dry matter accumulated rapidly. As nuts and seeds matured，saturated fatty acid content declined with content of most unsaturated fatty acids rising gradually. However，linoleic acid content declined sharply. These results have theoretical importance for determining harvest time and appropriate storage techniques for S. tonkinensis nuts.［Ch，3 fig. 2 tab. 14 ref.］