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Antioxidant Activity of Onion (Allium cepa L.) Peel Extracts Obtained as Onion Byproducts

산업체 적용을 위한 양파껍질 추출물의 항산화활성

  • Received : 2013.11.11
  • Accepted : 2014.02.18
  • Published : 2014.06.30

Abstract

This study investigated the antioxidant activity of onion peels extracted from onion byproducts by hot water treatment. Hot water extraction of freeze dried onion peel powder was analyzed for total polyphenol content, 2,2'-diphenyl-1-picryllhydrazyl (DPPH), and 2,2'-azino-bis(3-ehtylbenzothiazoline-6-sulphonic acid) (ABTS) radical scavenging activities, reducing power, oxygen radical absorbance capacity (ORAC). Total polyphenol content was the highest (233.90 mg/g) in onion peel extract mix with ethanol (OPME-1). The DPPH radical scavenging activity ($IC_{50}$), reducing power, and ORAC obtainbed from onion peel extract mix with ethanol precipitation (OPMPE-1) were the highest at 1.15 mg/mL, 1.69 $A_{700}$, and $318,509{\mu}M\;TE/mL$, respectively. The ABTS radical scavenging activity was the highest at 432.78 mg amino acids (AA) eq/g in the OPM. The results of this study suggest that onion peel extracts have marked antioxidant activity, which can have significant health benefits.

양파가공부산물인 양파껍질을 이용하여 산업체에서 활용 가능한 추출공정으로 다양한 항산화활성 변화를 확인 하였다. 양파껍질 추출물의 총 폴리페놀 함량은 OPME-1에서 233.90 mg/g으로 가장 높게 나타났으며, DPPH법에 의한 항산화활성의 $IC_{50}$값은 OPMPE-1에서 1.15 mg/mL로 가장 높은 radical 소거활성을 나타났다. ABTS에 의한 총 항산화력은 OPM에서 432.78 mg AA eq/g으로 높은 항산화활성을 나타냈으며, 환원력은 OPMPE-1에서 1.69 $A_{700}$으로 높게 나타났고, ORAC 지수는 OPMPE-1에서 $318,509{\mu}M\;TE/mL$로 가장 높게 나타났다. 본 연구결과 실제 산업체에서 양파껍질 추출물을 제조할 때 활용 가능한 추출공정은 여러 번 반복 추출을 하는 것보다 1회 추출만 하는 공정이 항산화 활성 결과 기능성 식품소재 원료로 활용이 더 유리할 것으로 사료된다.

Keywords

References

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