Abstract
This study was performed for obtaining optimal extraction conditions to produce peach liqueur containing chitosan. Alcohol content of unsliced fruits was the largest recording 30% after extracting for 8 weeks and those of fruits sliced into four pieces were high recording around 28% after extracting for $6{\sim}8$ weeks. Sugar content was $11{\sim}13^{\circ}Brix$, total acidity was around 0.2% and pH was about 4.8. While soluble solids content was around 2.8% in unsliced fruits with a little change of the content, those of fruits sliced into four pieces were ranged from 2.8% to 3.1% and showing a tendency that longer extraction time increased the content. Brownness of unsliced fruits and fruits sliced into four pieces were $0.33{\sim}0.54$ and $0.56{\sim}0.73$ respectively. Total phenol content showed a similar tendency with brownness and the total phenol content of sliced fruits was higher than that of unsliced fruits by only around 0.2 mg%. When peach liqueur was made by extracting unsliced fruits massively by following conditions set above, methanol content grew with longer extraction time but the difference was not significant and the content was detected to be extremely small recording about 50 ppb. Among organic acids, oxalic, malic and citric acids were found, and fructose, glucose, sucrose and maltose were detected as free sugars. In conclusion, extracting unsliced fruits for 8 weeks as extraction conditions showed an excellent quality in overall for peach liqueur containing chitosan.
키토산을 첨가한 복숭아 리큐르 제조를 위한 최적 침출조건을 설정하였다. 알코올함량은 완과를 8주간 침출시킨 구간에서 30%로 가장 높았고 절편과 구간은 6 및8주간 침출시킨 구간에서 약 28%로 높게 나타났다. 당도는 약 $11{\sim}13^{\circ}brix$, 총산도는 약 0.2%, pH는 약 4.8이었다. 가용성 고형분 함량은 완과 구간에서는 2.8% 전후로 함량변화가 크지 않았고, 절편과 구간에서는 $2.8{\sim}3.1%$로 나타나 침출기간이 길어질수록 고형분 함량이 증가하였다. 갈색도는 완과 구간에서는 $0.33{\sim}0.54$로 나타났고 절편과 구간에서는 $0.56{\sim}0.73$으로 나타나 절편과 구간이 완과 구간에 비해 흡광도 0.2정도 높은 수치를 보였으며 침출기간이 길어질수록 조금씩 증가하였다. 총 페놀함량은 갈색도와 유사한 경향을 보였고, 절편과 구간이 완과 구간에 비해 약 0.2 mg% 높게 나타나 수치적으로는 큰 차이를 보이지 않았다. 상기에서 설정된 완과 구간을 대량 침출시킨 복숭아 리큐르의 메탄올 함량은 침출기간이 길어질수록 증가하였으나 유의적인 차이는 없었고 약 50 ppb로 극미량 검출되었다. 유기산은 oxalic, malic 및 citric acid가 검출되었고, 유리당은 fructose, glucose, sucrose 및 maltose가 검출되었다. 따라서 키토산을 첨가한 복숭아 리큐르는 완과 8주간 침출조건이 전반적으로 품질이 우수하였다.
