以往常用來添加於易氧化、異構化且具熱敏感性的β-胡蘿蔔素商品中之人工抗氧化劑－二丁基羥基甲苯(butylated hydroxytoluene, BHT)都是在其製為成品後才添加，故本研究擬以一套半流動式高壓相平衡實驗裝置來量測β-胡蘿蔔素固體在超臨界二氧化碳中的平衡溶解度數據，並以BHT作為共溶質，在不同的溫度壓力條件下，分別量測雙成份與多成份系統之溶解度數據，由所得的實驗數據探討以BHT作為共溶質來提高超臨界二氧化碳對β-胡蘿蔔素之萃取率的可行性，並嘗試用以締合定律(association law)與局部密度(local density)觀念為基礎的熱力學模式來進行關聯和計算，以作為在日後延續的研究工作中，欲發展一套分離程序設計所需之最適熱力學計算模式時的參考。
無論一般的有機萃取或超臨界萃取程序，β-胡蘿蔔素都會因氧化或異構化而有損失，因此若能以人工抗氧化劑當作共溶質來提高β-胡蘿蔔素的萃取率，加上其本身的抗氧化性質，則β-胡蘿蔔素的產率將能大幅提高，而本研究的實驗結果雖顯示BHT使β-胡蘿蔔素的溶解度降低，但卻能提供一套方法供日後針對對其他人工抗氧化劑或類胡蘿蔔素的共溶質效應作探討時的參考，以期找到使β-胡蘿蔔素產率提高的最佳共溶質，不過因為法規的關係，人工抗氧化劑的添加量也有一定的比例規定，因此未來在找到β-胡蘿蔔之最佳共溶質的同時，也需藉由進一步對交錯區間及交錯壓力的決定，才能進行分離工作，使產品中的人工抗氧化劑含量符合法規。

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