시판 비파나무잎차의 영양성분 및 항산화 활성
Nutritional Components and Antioxidant Activities of Commercial Loquat(Eryobotrya japonica) Leaf Tea
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본 연구에서는 시판 비파나무잎차의 영양성분 분석 및 열수 추출물을 이용하여 항산화 효과를 조사하였다. 일반성분은 수분 5.34%, 조단백 8.38%, 조지방 13.26%, 가용성 무질소물 46.21%, 조섬유 19.24% 및 조회분 7.57%순으로 함유하고 있었다. 비타민 C 함량과 총페놀 함량은 각각 0.47 mg/100 g 및 42.55 mg/g이였다. 무기성분은 Ca, K 및 Mg 순으로 높게 나타났으며, 그 함량은 각각 1,624.01, 1,099.66 및 192.70 mg/100g이었다. 비파나무잎차의 아미노산 분석 결과 glutamic acid (565.98 mg/100 g)가 가장 높게 함유되었고, 반면 가장 낮은 함량은 cystine (12.97 mg/100 g)이였다. 시판 비파나무잎차 열수 추출물 농도 1,000 μg/mL를 기준으로 했을 때 각각 86.87%와 98.14%의 ABTS 및 DPPH 라디칼 소거활성을 보였으며, 환원력과 ferric reducing antioxidant power (FRAP)는 농도 의존적 항산화 활성을 보였다. 따라서 시판 비파나무잎차는 항산화제와 같은 기능성 식품 소재로 이용가능성이 높을 것으로 생각된다.
Abstract
Nutritional components and antioxidant activities of commercial loquat leaf tea (CLLT) were evaluated. Proximate compositions were as follows; moisture 5.34%, crude protein 8.38%, crude fat 13.26%, nitrogen free extract 46.21%, crude fiber 19.24% and crude ash 7.57%, respectively. Ascorbic acid and total phenolics content of CLLT was 0.47 mg/100 g and 42.55 mg/GAE g, respectively. Mineral elements were Ca 1,624.01 mg/100 g, K 1,099.66 mg/100 g, and Mg 192.70 mg/100 g, respectively. Amino acid contents of CLLT were very rich in glutamic acid 565.98 mg/100 g and deficient in cystine 12.97 mg/100 g. The 2,2'-azino-bis (3-ethylbenzthiazoline-6- sulfonic acid) diammonium salt (ABTS), 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activities of hot water extract from CLLT were 72.51% and 90.11%, respectively at a concentration of 1,000 μg/mL. Reducing power and ferric reducing antioxidant power (FRAP) of hot water extract from CLLT were increased in a dose dependent manner. Therefore, these results suggest that the hot water extract of CLLT possess antioxidant activities and thus it has great potential as a source for functional food such as natural antioxidant.
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