- 學位論文
未熟成白蘭地成分與其導電度關係之研究
The Relation between Composition and Electrical Conductivity of Non-aged Brandy
摘要
白蘭地為白葡萄酒置於蒸餾鍋進行二次蒸餾所得產物，蒸餾過程中成分所產生之變化會影響白蘭地的品質與香氣；然目前製酒工業中尚缺乏相關之即時監控儀器，因此若探討可應用於蒸餾過程之即時監控方法，將有助於產品品質之穩定及提升。本研究即針對蒸餾過程中未熟成白蘭地之成分與其導電度之變化進行研究，探討將導電度研究應用於製酒工業之可行性。 本研究分為三個部分，第一部分為初蒸過程和複蒸過程中酒液成分與導電度之變化；第二部分測量白葡萄酒、初蒸液、初蒸液(含銅)、複蒸液及複蒸液(含銅)的成分分析。第三部分以未熟成白蘭地成分配製模式溶液，觀察乙醇、醋酸及二氧化硫對酒液導電度之影響。 結果顯示經過二次蒸餾所得之未熟成白蘭地酒精度為73%，非揮發性有機酸、醣類皆被去除，揮發性酸以醋酸為主。蒸餾過程酒液之乙醇、醋酸、二氧化硫含量變化與導電度呈線性關係，因此可利用本實驗之經驗方程式作為酒液蒸餾之即時監測。配製模式白蘭地發現乙醇、醋酸及二氧化硫皆為導電度之影響因子，且醋酸及二氧化硫為提供導電度之物質，乙醇則為抑制導電度之主要成分，故可以利用乙醇、醋酸與二氧化硫之含量來推導模式白蘭地蒸餾過程之導電度。
並列摘要
Brandy is a spirit produced by the distillation of white wine. The traditional distillation process is double distillation in copper stills. The composition change during the distillation process would influence the flavor and quality of brandy. However, no on-line monitoring sensors for improving the quality of brandy have been applied in bandy industry yet. The objective of this study is to develop a method for estimating the content of volatile acids in non-aged brandy by measuring electrical conductivity of the distillate in the distillation process. This study was divided into three parts: the first part was to monitor the change of brandy composition and electrical conductivity in first distillation and second distillation. The second part was to analyze the composition of white wine, brouillis, brouillis-contacted with copper, bonne chauffe and bonne chauffe-contacted with copper. The last part used model solution prepared by non-aged brandy to investigate the effects of ethanol, acetic acid and sulfuric dioxide on the electrical conductivity. The results showed that all organic acids except acetic acid and total sugar were almost completely removed during distilling for the non-aged brandy at 73% ethanol content. Linear correlation was found between electrical conductivity and ethanol content, acetic acid content, or sulfuric dioxide during distillation. The empirical equations were deduced. As an influential factor on, ethanol would reduce the electrical conductivity, whereas acetic acid and sulfuric dioxide would increase it.