伽羅木醇型土肉桂葉子精油之安定性

伽羅木醇型土肉桂（Cinnamomum osmophloeum ct. linalool）為臺灣原生土肉桂中的一種化學品系，其葉子精油及其主成分S-(+)-Linalool皆具有良好的抗焦慮活性。本研究先分析比較伽羅木醇型土肉桂6個植物部位S-(+)-Linalool之含量；然後為瞭解葉子精油及S-(+)-Linalool之安定性，乃評估乾燥方式及貯藏時間對精油成分含量之變化；最後分析葉子放置不同時間後所釋出S-(+)-Linalool之濃度。首先，本試驗利用超音波輔助微量萃取法（Ultrasound-assisted microextraction, UAME）萃取試樣精油，並以Tenax TA採樣管吸附葉子釋出至空氣中的S-(+)-Linalool，再分別利用GC-MS及GC-FID分析其成分含量。比較6個植物部位S-(+)-Linalool含量之結果顯示，僅葉子含有大量S-(+)-Linalool。另一方面，氣乾與烘乾（30、45及60°C）對葉子精油的化學組成均無顯著影響，主成分皆為S-(+)-Linalool（≥78.6%）；其中，利用60°C烘乾葉子的效率較佳，乾燥所需時間最少（2h），且只需使用少量電能（0.3 kWh）。至於乾燥葉子裝袋貯藏於室內環境6個月後仍保有大量S-(+)-Linalool（21.1-28.4 mg/g leaf）；此外，每克葉碎片（4.76-6.35 mm）及葉粉（0.59-3.36 mm）放置於室溫環境60 min後，釋出之S-(+)-Linalool仍保有能舒緩人體壓力之濃度（9.8 mg m^(-3)g^(-1)）。綜合上述結果得知，伽羅木醇型土肉桂葉子精油及其主成分S-(+)-Linalool的安定性極佳，且葉子磨碎後極具潛力做為未來開發紓壓產品之來源。

關鍵字

乾燥條件；葉子粒徑； S-(+)-伽羅木醇；貯藏時間；超音波輔助微量萃取法

並列摘要

Cinnamomum osmophloeum ct. linalool is one chemotype of the indigenous cinnamon in Taiwan. Both of its leaf essential oil (LEO) and the major component, S-(+)-linalool, possess excellent anxiolytic activities. To compare their S-(+)-linalool content, essential oils (EOs) of six plant parts of C. osmophloeum ct. linalool were first analyzed. Next, drying treatment, storage treatment, and amounts of S-(+)-linalool emitted from leaves with different storage times were evaluated to understand the stability of the LEO and S-(+)-linalool. EOs and S-(+)-linalool emitted from leaves were extracted using ultrasound-assisted microextraction and Tenax TA adsorbents, respectively. The chemical components of EOs and S-(+)-linalool were analyzed using GC-MS and GC-FID. The results from the GC-MS analysis showed that only the leaf contained a large amount of S-(+)-linalool, compared with the other five plant parts. On the other hand, results demonstrated that air drying at ambient temperature and oven drying (30, 45, and 60°C) had no significant effect on chemical composition of the LEO. The major component in the LEOs was all S-(+)-linalool (≥78.6%). Leaves oven-dried at 60°C was found to have better drying treatment efficiency, that required only 2 h and 0.3 kWh The result also showed that dried leaves packaged in polyethylene material retained a large amount of S-(+)-linalool (21.1 -28.4 mg/g leaf) during 6-month storage at ambient temperature. After being crushed, within 60 min both leaf flakes (4.76-6.35 mm) and leaf powders (0.59-3.36 mm) emitted S-(+)-linalool in a concentration higher than 9.8 mg m^(-3) g^(-1)leaf (a known concentration for the stress-relieving activity). Taken together, both LEO of C. osmophloeum ct. linalool and its major component, S-(+)-linalool, had an excellent stability in the leaf. The results also suggested that crushed-leaf may be used as a potential source on the development of stress-relieving products.

並列關鍵字

Drying conditions ； Particle size of leaves ； S-(+)-Linalool ； Storage duration ； Ultrasound-assisted microextraction

國際替代計量

伽羅木醇型土肉桂葉子精油之安定性

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