• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.119-119
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• 2018

국화과(Compositae) 다년생 초본인 곰취속(Ligularia)은 국내에 약 9종이 자생하는 것으로 알려져 있으며, 이 중 곰취 (L. fischeri (Ledeb.) Turcz.)와 곤달비 (L. stenocephala (Maxim.) Matsum. & Koidz.)는 잎을 생체로 식용하는 대표적인 산채자원으로 최근 웰빙 채소의 소비가 증가하면서 곰취와 곤달비를 비롯한 다양한 산채자원에 대한 생리활성 연구가 다수 수행되고 있다. 본 연구에서는 동일 기간에 수확한 국내 각 지역에서 재배 생산되는 곰취와 곤달비의 온수추출물($45^{\circ}C$)을 대상으로 총 페놀 및 플라보노이드 함량을 분석 비교하였다. 총 페놀함량은 Folin-Ciocalteu법으로 측정하였고, 8.08-19.06 mg gallic acid equivalent (GAE)/g dry weight의 함량을 나타냈다. 또한 총 플라보노이드 함량은 Aluminum chloride법으로 측정하였으며, 4.01-18.91 mg quercetin equivalent(QE)/g dry weight 범위에서 값이 확인되었다. 통계 분석 결과, 총 페놀함량은 곰취와 곤달비 종간에 차이가 없었으나 폴라보노이드 함량의 경우, 통계적 유의차를 보이며 곤달비의 평균 플라보노이드 함량이 상대적으로 더 높은 것으로 확인되었다. 한편, 총 페놀함량에서는 곰취와 곤달비 모두 재배 지역 간에 차이를 보였으나 총 플라보노이드 함량은 곰취 개체(지역) 간 차이가 거의 없는 것으로 나타났다. 본 연구결과는 곰취와 곤달비 외 기타 산채자원들을 활용한 건강기능식품 개발 연구의 기초자료로 활용될 수 있으며, 추후 구체적인 생리활성 연구와 형태적으로 매우 유사한 두 종간 명확한 기원정립 연구가 함께 이루어진다면 재배 생산 유통 안전성을 높여 농가 소득 증대 효과를 기대할 수 있을 것이다.

• Journal of the Korean Applied Science and Technology
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• v.34 no.1
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• pp.173-182
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• 2017

This study was conducted to investigate the change of Aaster scaber antioxidative activity, total phenolic compounds and flavonoids during the blanching processes. With two parameters such as blanching time and temperature, response surface methodology and central composite design was used to study the combined effect of blanching time (90 to 162 sec) and blanching temperature (75 to $99^{\circ}C$). We found that antioxidative activity, total phenolic compounds and flavonoids during the blanching processes were influenced by blanching temperature and time. Within process condition, total phenolic compounds and flavonoids were extracted 3.00 - 35.48 mg/g and 2.35 - 8.38 mg/g, respectively. DPPH radical scavenging activity was 42.10 - 67.14%. The change of total phenolic compounds, flavonoids, and DPPH radical scavenging activity was dependent of blanching temperature more than time. The total phenolic compounds was increased as temperature rise, but flavonoids not. However, DPPH radical scavenging activity was increased during the blanching process.

• Food Science and Preservation
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• v.13 no.4
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• pp.501-505
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• 2006

This study was carried out to investigate the antioxidative activity and cytotoxicity on human KB cell of extract from Rhododendron mucronulatum flower, and also to determine the contents of total polyphenol and flavonoid. The methanol extract of Rhododendron mucronulatum flower was fractionated with various solvents such as hexane, chloroform, ethyl acetate, butanol and water. The DPPH radical scavenging activities of ethyl acetate fraction had stronger activity than other fractions. So, antioxidative substances of ethyl acetate fraction were crude purified by silica gel column chromatography. The DPPH radical scavenging activities of crude purified fraction 2 and 3 were more than 90% at 40 ppm. In the presence of $100{\mu}g/mL$, growth inhibition on human KB cell by WST-1 assay showed 81.2% in chloroform fraction and 74.6% in hexane fraction. The contents of total polyphenol and flavonoid of ethyl acetate traction were 32.70% and 20.30%, respectively, The antioxidative activity showed correlation with total polyphenol and flavonoid contents.

• Korean Journal of Food Science and Technology
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• v.52 no.1
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• pp.54-59
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• 2020

The inconsistent methods of harvest, identification, and preparation of brown algae samples make it difficult to compare the results of certain measurements across different studies, such as total phenolic contents (TPC), total flavonoid contents (TFC), and total antioxidant capacities (TAC). Therefore, this study aims to systematically measure and compare TPC, TFC, and TAC in 10 types of standardized brown algae extracts provided by the Bio-Resource Information System of Korea. Among the ten brown algae extracts, Ishige foliacea exhibited the highest levels of TPC and TAC, followed by Sargassum nigrifolium. TAC was measured by the following four assays: ABTS, DPPH, superoxide radical scavenging activities, and ferric reducing antioxidant power. TAC was found to be positively correlated with TPC (p<0.05) but not TFC, indicating that Ishige foliacea and Sargassum nigrifolium have potential use as marine antioxidative food material.

• Journal of Plant Biotechnology
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• v.44 no.1
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• pp.35-41
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• 2017

One of the most important species, Brassica rapa encompasses a variety of commercial vegetables, such as the Chinese cabbage, pak choi and oilseed crops. The LP08 of yellow sarson (Brassica rapa ssp, tricolaris) have a distinct morphology, with yellow seed color and a unique tetralocular ovary. LP21 of pak choi (Brassica rapa ssp, chinensis) have a dark brown seed color and bilocular ovary. In this study, we generated double haploid plants by crossing the LP08 (maternal variety) and LP21 (paternal variety), using microspore culture. A total of 66 accessions with various morphological characteristics were used for content analysis of flavonoids. The three flavonoids, quercetin, naringenin and kaempferol, showed differing contents in the two crossing parents. The Chinese cabbage type 'Chiifu' was used as the control. The highest accumulation of total flavonoids was observed in LP08. The lowest mean total flavonoids were found in 'Chiifu'. Among the 66 DH accessions, the quercetin contents of 18 accessions showed higher content than LP08. Kaempferol content was also high, and was found to be 79.7% of the total flavonoid content. Naringenin content was low at 2.8%, and was not detected in 22 accessions. Interestingly, the quercetin content positively correlated with the kaempferol content. These results can be used to identify genetic locus and genes related to useful traits. Phenotypic analysis of 66 DH accessions can further be used for natural selection of good breeding materials in B. rapa.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2023.04a
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• pp.65-65
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• 2023

제주도에서 재배되어 온 재래귤 5종(당유자, 유자, 청견, 하귤, 팔삭) 부위별 에탄올 추출물의 총 폴리페놀 함량 측정, 총 플라보노이드 함량 측정, DPPH radical 소거 활성 실험을 실시하였다. 총 폴리페놀 함량의 경우, 5종 재래귤(당유자, 유자, 청견, 하귤, 팔삭) 부위별 에탄올 추출물 가운데 당유자의 외피(244.84mg/g)와 중피(200.70mg/g) 처리구에서 폴리페놀 함량이 가장 높았다. 총 플라보노이드 함량의 경우, 총 폴리페놀의 함량 측정에서와 마찬가지로 5종 재래귤(당유자, 유자, 청견, 하귤, 팔삭) 부위별 에탄올 추출물 가운데 당유자의 외피에서 102.12mg/g으로 가장 높았으며, 청견과 하귤, 팔삭의 플라보노이드 함량은 폴리페놀 처리구와 같이 당유자 처리구보다 적게 나타났다. DPPH radical 소거 활성의 경우, 총 폴리페놀 함량과 총 플라보노이드 함량 측정의 결과에 같은 경향으로 5종 재래귤(당유자, 유자, 청견, 하귤, 팔삭) 부위별 에탄올 추출물 가운데 당유자의 외피(79.39%)와 중피(70.73%)에서 가장 양호한 항산화 활성을 나타내었다. 이러한 결과들로부터 당유자의 두꺼운 과피 구조인 외피와 중피에 에센셜 성분인 limonene, myrcene, β-ocimenes 등과 같은 향기성분들의 영향으로 생각되어 앞으로 이에 대한 연구가 더 필요하리라 생각된다.

• Journal of Nutrition and Health
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• v.48 no.6
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• pp.496-506
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• 2015

Purpose: The purpose of this study was to estimate dietary flavonoids intake of Korean adolescents. Methods: Using data from the 2007-2012 Korean National Health and Nutrition Examination Survey, a total of 3,957 subjects aged 12-18 were included in this study. We estimated individual daily intake of total flavonoid and six flavonoid classes including flavonols, flavones, flavanones, flavan-3-ols, anthocyanidins, and isoflavones by linking food consumption data with the flavonoids in the commonly consumed food database. The distribution of sociodemographic, health-related, and dietary factors according to flavonoids intake was examined. Results: Average dietary flavonoids intake of the study subjects was 195.6 mg/d in girls, and 189.4 mg/d in boys. The highest flavonoids intake group consumed significantly more fiber, vitamin C, legumes, fruits, and vegetables (p < 0.01) and less fat, grains, meats and dairy foods than other lower consumption groups (p < 0.001). Dietary flavonoid intake showed negative correlation with waist circumference and systolic blood pressure (p < 0.05). Conclusion: This study provided basic data for estimation of flavonoids intake of Korean adolescents. Further research will be required for analysis of the association of flavonoids intake and health-related factors such as cardiovascular risk factors.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.04a
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• pp.83-83
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• 2018

최근 매실나무를 기주로 한 겨우살이의 인공재배에 성공함에 따라, 식 의약품과 화장품의 소재 및 산업화 가능성을 확인하기 위해 80% 에탄올 및 증류수 초음파추출물의 총 폴리페놀 플라보노이드 함량 및 DPPH free radical 소거능을 측정하였다. 경기도 남양주시에서 인공재배한 매실나무겨우살이(동결건조) 및 강원도 홍천에서 채취한 자연산 굴참나무겨우살이(열풍건조, $30^{\circ}C$, 7day)의 80% 에탄올, 증류수 초음파추출물에 대한 총 폴리페놀 및 플라보노이드함량 그리고 DPPH free radical 소거능을 측정한 결과, 시료의 농도에 비례하여 총 폴리페놀과 플라보노이드 함량 그리고 DPPH free radical 소거능이 증가하였다. 총 폴리페놀 함량은 매실나무겨우살이의 80% 에탄올 추출물이 5,000ppm에서 $192.63{\mu}g/ml$로 가장 많았으며, 굴참나무겨우살이의 물 추출물이 100ppm에서 $4.86{\mu}g/ml$로 가장 낮고 매실나무겨우살이가 모든 용매에서 더 많은 폴리페놀을 함유한 것으로 확인되었다. 총 플라보노이드 함량은 굴참나무겨우살이의 80% 에탄올 추출물이 5,000ppm에서 $83.59{\mu}g/ml$로 가장 높았으며, 매실나무겨우살이 물 추출물이 $4.6{\mu}g/ml$로 가장 낮았고 굴참나무겨우살이가 모든 용매에서 더 많은 플라보노이드를 함유한 것으로 확인되었다. DPPH free radical 소거능은 80% 에탄올 추출물 5,000ppm에서 매실나무겨우살이 81.75%로 시료 중 가장 높았고, 굴참나무겨우살이 물 추출물 100ppm이 3.55%로 가장 낮음을 확인할 수 있었다. 본 연구 결과에 따르면, 겨우살이를 초음파추출법으로 추출할 때, 80% 에탄올 초음파추출물이 더 많은 폴리페놀을 함유하여 80% 에탄올 추출물이 물 추출물보다 비교적 적합하였다. 80% 에탄올로 초음파추출 하였을 때 동결건조 한 매실나무겨우살이가 열풍건조한 자연산 굴참나무겨우살이보다 더 많은 폴리페놀을 함유하고 있고, 더 높은 DPPH free radical 소거능을 보여줌에 따라 식 의약품 그리고 화장품의 소재화 및 산업화의 가능성이 높음을 확인할 수 있었다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.43 no.9
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• pp.1349-1356
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• 2014

This study investigated the biological activities of 70% methanol extracts from black chokeberry and blueberry by measuring DPPH, superoxide anion and ABTS radical scavenging activities, metal chelating effect, reducing power, and nitrite scavenging activity. Extraction yields of black chokeberry and blueberry were 62.90% and 67.09%, respectively. Total polyphenol and total flavonoid contents were 117.20 mg/g and 32.50 mg/g for black chokeberry and 42.26 mg/g and 26.39 mg/g for blueberry, respectively. Black chokeberry had higher antioxidant activity than blueberry. DPPH and ABTS radical scavenging activities, nitrite scavenging activity, and metal chelating effect of black chokeberry were 98.29%, 96.68%, 97.64%, and 91.33%, respectively, at a concentration of 5 mg/mL, which were equal to those of ascorbic acid (positive control). These results suggest that black chokeberry has potent biological activities, and in the future, the availability of black chokeberry will increase in the field of value added food products.

• Korean Journal of Food Science and Technology
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• v.44 no.3
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• pp.337-342
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• 2012

The purpose of this study was to investigate total polyphenols, total flavonoid, and DPPH radical scavenging activity in 26 species of Korean natural plants and 14 species of medicinal plant extracts. The plant containing the highest total polyphenols and total flavonoids were Plantago asiatica, and Lespedeza cuneata G. Don, respectively. The content of polyphenols and flavonoids in natural plants was the highest in Lespedeza cuneata G. Don, which also demonstrated high DPPH radical scavenging activity. In medicinal plant extract, Saururus chinensis (Lour.) Baill and Artemisiae Asiaticae Herba had the highest level of total polyphenols (194.60 and 203.92 mg/g extract, respectively) and DPPH radical scavenging activity. Diospyros kaki Thunb and Dryopteris crassirhizoma did not contain high levels of total polyphenols (112.98, 121.46 mg/g extract, respectively) and flavonoids (46.10, 58.69 mg/g extract respectively), but DPPH radical scavenging activity was relatively high. Further study regarding plants that exhibit higher total polyphenols, total flavonoid, and DPPH radical scavenging activity is needed.