添加合成抗氧化劑及天然萃取物對痲瘋樹原油在長期貯存下的氧化安定性研究

Stabilization of Jatropha crude oil with synthetic antioxidants and natural extracts for a long-term storage

陳貞汝(Chen-Ju Chen)

指導教授 ： 鍾財王

中原大學/工學院/化學工程研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000381

摘要

本實驗主要針對麻瘋樹原油添加200ppm的合成抗氧化劑沒食子酸丙酯PG(propyl gallate)、丁基羥基苯甲醚BHA(butylated hydroxyanisole)及濃度1600ppm和2400ppm的天然大蒜萃取(garlic extract)、馬鈴薯皮萃取(potato peel extract)、柑橘皮萃取(citrus peel extract)，長時間貯存在25℃和45℃下，每隔三個月觀察其酸價(acid value)、氧化安定值(rancimat induction period)、含水量(water content)及折射率(refraction index)的變化情形。
發現在25℃及45℃的保存環境下，添加1600ppm和2400ppm天然萃取大蒜的油品有較低的酸價，且在25℃環境的長期貯存下，添加天然大蒜萃取的氧化安定值超過了合成抗氧化劑丁基羥基苯甲醚BHA，且抗氧化程度接近合成抗氧化劑沒食子酸丙酯PG；而添加天然大蒜萃取及馬鈴薯皮萃取，油品的氧化安定值達10小時以上，超過合成抗氧化劑丁基羥基苯甲醚BHA的抗氧化能力；在含水量及折射率等參數的變化上，則沒有太大的差異。
添加天然柑橘皮萃取雖然有較低的酸價值，但是氧化安定值僅些微高於歐盟標準6小時，且因本身材料的含水量高，因此添加在麻瘋樹原油中做抗氧化測試，並沒有出色的抗氧化效力。而和添加200ppm的合成抗氧化劑比較，添加天然萃取物的效果已可以達到添加合成抗氧化劑的抗氧化程度。
因此本實驗結果顯示，添加天然大蒜萃取及天然馬鈴薯皮萃取在麻瘋樹原油中，可以維持一定的氧化安定性，且效果和市面上常見的合成抗氧化劑相當，另外，馬鈴薯皮還有廢物再利用的優點，若是尋找替代合成抗氧化劑，維持麻瘋樹原油的安定性，天然大蒜萃取及馬鈴薯皮萃取皆具有良好的潛力。

關鍵字

抗氧化劑 ； 麻瘋樹

並列摘要

This research focus on Jatropha crude oil adding 200ppm synthetic antioxidants PG (propyl gallate), BHA (butylated hydroxyanisole), and 1600ppm, 2400ppm natural garlic extract, potato peel extract, citrus peel extract during a long-term storage at 25℃ and 45℃. The different parameters, such as acid value, rancimat induction period, water content and refraction index were tested every three months.
During a long-term storage at 25℃ and 45℃, the antioxidant activities of adding 1600ppm and 2400ppm garlic extract has lower acid value, and storage at 25℃, the antioxidant activity of Jatropha crude oil with garlic extract even exceeds that of adding BHA, and the oxidation stability almost reach the degree of adding PG. The oxidation stability of crude oil adding garlic extract and potato peel extract are over 10 hours, and are higher than adding synthetic antioxidant, BHA. But in other parameters, like water content or refraction index, there’s no evidence change.
Jatropha crude oil with citrus peel extract also has lower acid value, but the oxidation stability almost reaches 6 hours, and the water content is high. So it’s not a good material to be antioxidants instead of synthetic antioxidants.Compare with 200ppm synthetic antioxidants, the antioxidant effect of natural extract nearly reach the level of synthetic antioxidants.
And potato peel is a waste material, so it’s better to use garlic extract and potato peel extract instead of using synthetic antioxidants to prolong the shelf-life of oil.

並列關鍵字

Jatropha crude oil ； Antioxidants

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