LED irradiation이 Muscat bailey A 와인의 발효 및 페놀성 화합물의 변화에 미치는 영향
Changes in Fermentation Properties and Phenolic Contents of Muscat Bailey A Wine by LED Irradiation Treatment
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이 연구에서는 Muscat Bailey A wine 제조에 있어 알코올 발효중 LED hormesis의 영향을 확인하고자 하였다. 453 ± 4 nm, 522 ± 3 nm 파장의 LED를 must에 irradiate하며 발효특성 및 페놀성 화합물 함량과 항산화활성을 control group과 비교하였다. Control group에 비해 LED를 irradiate한group의 유기산 조성 중 Lactic acid 함량이 낮게 나타났는데, 이는 LED 파장의 젖산균 생육 저해 효과에 따른 것으로 사료된다. 발효 중 yeast의 균수증가와 당 소모는 453 ± 4 nm 파장의 blue LED를 irradiate한 group이 다른 group에 비해 발효초기 빠른 경향을 보였으나 3일 후에부터는 다른 group과 큰 차이를 보이지 않았다, 522 ± 3 nm 파장의 green LED는 발효 초기에 다른 group에 비해 높은 항산화 활성을 나타냈다. 이는 LED irradiation이 발효 중 hormesis를 유발하여 yeast의 생육 속도와 발효액 내 생리활성물질을 증가시킨 것으로 사료된다. 위 결과를 통해 와인발효 중LED 자극에 의한 hormesis의 적용 가능성을 확인할 수 있었으며, 향후 LED hormesis가 어떤 기작에 의해 발효중 yeast의 생육속도를 향상시키고 포도 발효액 내의 생리활성물질을 증가시키는지에 대한 추가적인 연구가 필요할 것으로 보인다.
Abstract
There have been several studies on role of hormesis with light stimulation, however, the influence of light on fermentation is still poorly understood. In this study the relationship between LED (light emitting diode) hormesis and ethanol fermentation for Muscat bailey A wine was investigated. Two LEDs, one blue (453 ± 4 nm) and one green (522 ± 3 nm), were used. Both LED groups showed an inhibited production of lactic acid. The blue LED stimulated the growth of the yeast in early stage of the fermentation. Polyphenolic compounds and their antioxidant abilities were significantly increased by the green LED. These results demonstrate that LED irradiation must bring about hormesis and affect the growth rate of yeast in the early stage of the fermentation, and the contents of phytochemicals during fermentation. These findings indicate the possible application of LED hormesis for the wine fermentation. Further studies are needed to understand how LED irradiation induces hormesis effects during the fermentation process.
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