Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Post-harvest LED and UV-B Irradiation Enhance Antioxidant Properties of Asparagus Spears

수확 후 LED와 UV-B 조사에 의한 아스파라거스 순의 항산화 기능 향상

  • Yoo, Nam-Hee (Bureau of Industry Cooperation and Research, Chonbuk National University) ;
  • Jung, Sun-Kyun (Department of Crop Science and Biotechnology, Chonbuk National University) ;
  • Lee, Chong Ae (Institute of Agricultural Science and Technology, Chonbuk National University) ;
  • Choi, Dong-Geun (Department of Horticulture, Chonbuk National University) ;
  • Yun, Song Joong (Department of Crop Science and Biotechnology, Chonbuk National University)
  • 유남희 (전북대학교 산학협력단) ;
  • 정선균 (전북대학교 농업생명과학대학 작물생명과학과) ;
  • 이정애 (전북대학교 농업과학기술연구소) ;
  • 최동근 (전북대학교 농업생명과학대학 원예학과) ;
  • 윤성중 (전북대학교 농업생명과학대학 작물생명과학과)
  • Received : 2016.09.05
  • Accepted : 2016.10.09
  • Published : 2017.04.28
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Abstract

Asparagus (Asparagus officinalis L.) spears were treated with white (color temperature 4,500 k), blue (peak 450 nm), and red (peak 660 nm) light-emitting diodes (LEDs) at a photosynthetic photon flux density (PPFD) of $200{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ for 12 h, and UV-B (280 nm) at 0.5 kJ or 1.0 kJ to determine the effect on agronomic characteristics, antioxidant phytochemicals, and antioxidant activity. The fresh weight, length, and width of spears were not affected by light quality treatments. The free sugars and chlorophyll contents were increased by 9 and 41%, respectively in the UV-0.5 kJ treatments. Among the antioxidant phytochemicals (vitamin C, total phenol, rutin, and total flavonoid), vitamin C was most greatly affected by the light treatments. Vitamin C content was significantly increased in asparagus spears subjected to the white (114%), red (137%), and UV-0.5 kJ(127%) treatments compared to the control. By contrast, rutin, total phenol, and total flavonoid content were increased only in samples subjected to the red and UV-0.5 kJ treatment. Furthermore, antioxidant activity, as measured by DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity, increased in white, red, and UV-0.5 kJ treatments by about 43, 41, and 43%, respectively, compared to the control. These results suggest that postharvest treatment of asparagus spears with red light at $200{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ for 12 h or with UV-B (280 nm) at 0.5 kJ could enhance the functional quality of the asparagus spears by increasing the content of phytochemicals like vitamin C, rutin, total phenolics, and total flavonoids.

아스파라거스의 기능성을 향상시키기 위하여 처리 전 그리고 12시간 암상태로 저장한 아스파라거스를 대조구로 하여 백색(색온도 45,000 k), 청색(peak 450 nm), 적색(peak 660 nm)의 발광다이오드(light-emitting diode, LED)를 이용하여 수확한 아스파라거스 순을 광합성유효광양자속밀도(photosynthetic photon flux density, PPFD) $200{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$의 광으로 12시간 처리하고, UV-B(280 nm)를 0.5kJ 또는 1.0kJ로 처리하여 원예적 특성, 비타민C(total ascorbic acid), 루틴(rutin), 총 페놀(total phenolics) 및 총 플라보노이드(total flavonoids) 함량과 자유기 소거능에 미치는 영향을 조사하였다. 이들 처리는 아스파라거스 순의 생체중, 길이, 직경 등에 변화를 초래하지 않았으며, UV-B0.5kJ에서는 당도와 엽록소 함량이 각각 9%와 41% 증가하였다. 비타민 C, 루틴, 총 페놀 및 총 플라보노이드 등 항산화 성분 중에서 비타민 C 함량은 대조에 비하여 백색광(114%), 적색광 (137%) 및 UV-0.5 kJ(127%) 처리에서 크게 증가하였다. 반면 루틴, 총 페놀 및 총 플라보노이드 함량은 적색광이나 UV-0.5 kJ 처리에서만 대조구에 비하여 증가하였다. 또한 DPPH라디컬 소거능으로 측정한 항산화 활성은 대조구에 비하여 백색광, 적색광 및 UV-0.5kJ 처리구에서 각각 43, 41 및 43% 증가하였다. 이상의 결과는 적색광 12시간 처리나 UV-B 0.5kJ 처리로 아스파라거스 순의 원예적 특성의 변화가 초래되지 않는 상태에서 비타민 C, 루틴, 총 페놀, 총 플라보노이드 등의 함량이 증가되고 자유기 소거능도 향상됨을 의미한다. 따라서 수확한 아스파라서스의 순에 적색광 12시간 또는 UV-B 0.5kJ을 처리하면 채소 또는 음료의 원료로 사용되는 아스파라거스 순의 기능성 품질을 증진시킬 수 있을 것으로 생각된다.

Keywords

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