안토시아닌 색소가 다량 함유된 자색고구마를 이용하여 음료, 와인을 제조하는 방법과 음료, 와인, 분말, 식초, 색소의 저장기간별 색소 안정성을 구명코자 시험을 수행한 결과를 요약하면 다음과 같다. 1. 자색고구마 음료는 총고형분 15.6%, 당도 $11.8;Brix^{circ}%$, pH 4.1이었고, 와인은 알코올 12.6%, 당도 $7.8;Brix^{circ}%$, pH 4.9이었다. 음료와 와인의 색소 안정성은 4개월 저장 후에도 제조 시와 별다른 차이가 없었다. 2. 자색고구마 90% + 유자 5% + 벌꿀 5%로 조제한 음료가 자색고구마 100%나 자색고구마 80% + 유자 10% + 벌꿀 10%에 비하여 기호도가 높았고, 숙성온도는 $30^{circ}C$에 비하여 $45^{circ}C$가 더 높은 기호도를 보였다. 3. 자색고구마의 분말과 식초, 색소는 4개월 저장 후에도 색도의 변화가 없어 높은 안정성을 보였다.
This study was conducted to develop a processing procedure for soft drink and wine from purple sweetpotato and to determine the color stability of purple sweetpotato anthocyanin pigment after production. Purple sweet potato soft drink was found to have 15.6% of total extraction, $11.8;Brix^{circ}%$ of sugar and pH 4.1, whereas wine had 12.6% of alcohol, $7.8;Brix^{circ}%$ of sugar and pH 4.9.Color stabilities of the soft drink and wine showed little difference after four-month storage from the time right after processing. The public found the soft drink that was made from 90% of purple sweet potato, 5% of citron and 5% of honey, more to their taste, rather than other soft drinks that were either made from 100% purplesweet potato or made from 80% of purple sweet potato, 10% of citron and 10% of honey. The public also found $45^{circ}C$. of fermentation temperature more agreeable than that of $30^{circ}C$. Powder, vinegar and anthocyanin pigment earned from purple sweet potato showed high stability, as they showed no change in color after four months in storage.
