Studies on the Grape Wines (part II) - On the browing methods and the aging

포도주에 관한 연구 (제2보) - 포도주 양조방법 및 숙성촉진에 대하여

The qualities of the grape wines brewed with the varieties of Steuben, Muscat Bailey A, Merlot, Campbell Early and Alden were compared, and studied the mashing methods of the wine with a variety of Muscat Bailey A. and then investigated the aging effects of ultrasonic wave and the baking treatments on the new wines. The results obtained were as follows. 1. Extracts of the new wines brewed with the varieties of Steuben and Alden were 2.55 and 1.88 per cent respectively and the color densities of the wines with Merlot and Alden were 3.5 and 1.05 (optical density) respectively, and the other contents were not significantly different beween varieties. On the Otherhand, the results of sensory test showed that the order of favorite was the wines brewed with Steuben, Muscat Bailey A, Merlot, Campbell Early and Alden. 2. The effect of pasteurization ($55^{\circ}C$, 20 min.) on the inhibition of the growth of undesirable microorganism was appeared almost the same degree as the case of sulfiting (100 ppm), and the pasteurized must was more dense in color but slightly turbid than the case of sulfiting. 3. Glucose syrup was in adequate as a materials for supplemental sugar, and the quality of the new wine further fermented the free-run wine added the alcohol to be a constant alcohol content was almost the same as that of control. 4. Baking at $50^{\circ}C$. for 50 days to t he new wine from 0.45 to 0.65 per cent, and color density was also thicken from 2.8 to 3.17 (O. D). 5. Baking at $40^{\circ}C$. for 50days to the new wine brewed with Muscat Bailey A, increased the ester content of the wine from 0.37 to 0.65 per cent and color density was-also thicken from 3. to 4.2 (O.D). 6. Ultrasonic wave (150 watt, 20Kc) treatment for 10 hours to the new wine brewed with Muscat Bailey A, increased the ester content of the wine from 0.37 to 0.47 per cent.

Steuben. Muscat Baily. A, Merlot, Campbell Early 및 Alden으로 포도주를 시양(試釀)하여 품질을 비교하고 Muscat Baily A를 원료로 몇가지 담금법을 검토하였으며 또한 포도주의 인공적 숙성법을 검토하기 위하여 후발효가 끝난 포도주에 가열처리와 초음파 처리를 하여 다음과 같은 결과를 얻었다. 1. 품종별 포도주 성분에 있어서 Extract는 Steuben이 2.55%, Alden이 1.88%, 색도(O.D)는 Merlot가 3.5, Alden이 1.05였으며 다른 성분에 있어서는 품종간에 별 차이가 인정되지 않았다. 한편 관능검사 결과에 의하면 Steuden과 Muscat Baily A가 가장 양호 하였고 다음으로는 Merlot, Campbell Early, Alden의 순이었다. 2. 포도주 파쇄물료를 $55^{\circ}C$에서 20분간 처리 함으로서 잡균 번식 억제에 있어서 $SO_2$100ppm 첨가구와 같은 효과가 인정 되었으며 가열처리구의 색도는 $SO_2$ 첨가구에 비하여 훨씬 진하였으나 약간의 혼탁이 있었다. 3. 보당(補糖)재료로서 물엿은 부적당 하였으며 주발효가 끝난 포도주에 소정량의 주정을 첨가하여 후발효 시키면 주질은 대조구에 비슷하였다. 4. Campbell Early로 발효시킨 포도주를 $50^{\circ}C$에서 50분간 처리한 결과 총 Ester는 0.45%에서 0.6%로, 색도(O.D)는 2.8에서 3.17로 증가 하였다. 5. Muscat Baily A로 발효시킨 포도주를 $40^{\circ}C$에서 50분간 처리한 결과 총 Ester는 0.37%에서 0.65%로, 색도(O.D)는 3.7에서 4.20으로 증가 하였다. 6. Muscat Baily A를 발효시킨 포도주를 초음파(15watt, 20kc)로 10시간 처리한 결과 총 Ester가 0.3%에서 0.47%로 증가하였다.