Korean journal of food and cookery science (한국식품조리과학회지)

Korean Society of Food and Cookery Science (한국식품조리과학회)
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Antioxidative and Anti-Diabetes Activity, and Free Amino Acid and Mineral Contents of Beverage with Gugija (Lycii fructus) Extracts

구기자 추출물 함유 음료의 산화방지활성, 항당뇨효과, 유리아미노산과 무기질 함량

  • Lee, Kyong-Ae (Department of Food Science and Nutrition, Soonchunhyang University)
  • 이경애 (순천향대학교 식품영양학과)
  • Received : 2015.04.15
  • Accepted : 2015.04.20
  • Published : 2015.04.30
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Abstract

Free amino acid and mineral analysis of beverages with Gugija (Lycii fructus) extracts performed to determine the antioxidative and anti-diabetes activities of the beverages. The four major free amino acids in the water- or ethanol-extracts of the Gugija beverages were asparagine (115.23, 51.95 mg%), methionine (20.02, 22.07 mg%), aspartic acid (19.65, 13.72 mg%) and taurine (18.64, 22.44 mg%). The mineral contents of the Gugija beverages with water- and ethanol-extracts were in the order K>Mg>Na>Ca>Zn>Fe. Antioxidant activity determined by DPPH and ABTS radical scavenging activity. There was no significant difference in DPPH and ABTS radical scavenging activities between the water-extract beverages and the ethanol-extract beverages, although more phenolics and flavonoids were found in the ethanol-extract beverage. Higher anti-${\alpha}$-glucosidase activity was observed in the ethanol-extract beverage compared to acabose, which was used as the control and is an inhibitor of ${\alpha}$-glucosidase, suggesting that the Gugija beverage with ethanol extract could be a potential hypoglycemic agent.

구기자의 물추출물 및 50% 에탄올추출물을 이용한 음료의 유리아미노산, 무기질, 산화방지효과, ${\alpha}$-glucosidase 저해활성을 분석하였다. 두 음료에는 6종의 필수 아미노산(isoleucine, leucine, lysine, methionine, threonine, valine)을 포함한 15종의 유리아미노산과 6종의 유도체 등 21종의 아미노산 및 그 유도체가 분석되었다. 물추출물 이용음료와 에탄올추출물 이용음료의 주요 유리 아미노산은 asparagine(115.23, 51.95 mg%), methionine(20.02, 22.07 mg%), aspartic acid (19.65, 13.72 mg%), taurine (18.64, 22.44 mg%)이었으며 무기질은 K(438.80, 426.40 mg%)이 가장 많이 함유되어 있었으며 Mg>Na>Ca>Zn>Fe 순이었다. 산화방지효과는 DPPH 라디칼 소거능과 ABTS 라디탈 소거능으로 측정하였다. 에탄올추출물 이용음료는 물추출물 이용음료에 비해 폴리페놀, 플라보노이드 함량이 높았으나 두 음료의 DPPH 라디칼 소거능과 ABTS 라디칼 소거활성에는 유의적 차이가 없었다. 에탄올추출물 이용음료는 대조군인 acabose에 비해 높은 ${\alpha}$-glucosidase activity 저해활성을 나타내어 혈당저하 효과가 확인되었다. 따라서 50% 에탄올 추출물이 물추출물보다 음료 제조에 적합한 것으로 생각된다.

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