• Culinary science and hospitality research
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• v.21 no.5
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• pp.171-179
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• 2015

This study was conducted to investigate the antioxidant activity and the bioactive compounds found in 70% ethanol extracts taken from Sanguisorbae officinalis L. leaves(SO) cultivated in Korea. The extracts were tested for their total phenolic contents (TPC), total flavonoid contents (TFC), phenolic compounds, and antioxidative activities using various in vitro assay such as DPPH, ABTS radical scavenging activity, FRAP activity, and reducing power. The TPC and TFC were found to be $119.3{\pm}1.54mg$ gallic acid and $59.6{\pm}1.43mg$ rutin at mg of 70% ethanol extracts, respectively. Catechin was the major material among the phenolic compounds in SO extracts. The DPPH radical scavenging activity, ABTS radical scavenging activity, FRAP activity, and reducing power of SO extracts were increased in a dose-dependent manner. These results suggest that SO extracts could be considered as a good source of natural antioxidants and functional food ingredient.

• Journal of the Korean Society of Food Science and Nutrition
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• v.38 no.6
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• pp.807-811
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• 2009

In this study, the antioxidant compounds and antioxidant activities of Geumjong brown rice were measured to evaluate functional properties and to compare with white rice and Chuchung brown rice. The content of polyphenolics, flavonoids and $\gamma$-oryzanol were measured by spectrophometric methods and tocopherol and tocotrienol analyses were carried out by HPLC. ABTS and DPPH radical scavenging activity and reducing power were used to measure antioxidant activity. The extraction yield of Chuchung white rice, Chuchung brown rice, and Geumjong brown rice were 1.5, 2.3, and 3.5%, respectively. The high level of antioxidant activity (69.77 mg TEAC/100 g) and total polyphenolic content (69.1 mg gallic acid equivalents/100 g) were found in Geumjong brown rice, whereas the reducing power of Geumjong brown rice was lower than that of Chuchung brown rice.

• Journal of Applied Biological Chemistry
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• v.62 no.2
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• pp.167-172
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• 2019

In vitro antioxidant effect of 50% ethanol extract from Napier grass (Penninsetum purpureum) was investigated. The yield and polyphenol content of the Napier grass extract were $6.3{\pm}0.35%$ and $79.6{\pm}3.65{\mu}g$ gallic acid equivalents/mg-extract, respectively. Antioxidant ability of the Napier grass extract such as fee radical and cation radical scavenging activities, reducing power, nitrite scavenging activity, and lipid peroxidation inhibitory activity proportionally increased as concentration of the extract increased. $EC_{50}$ values of the Napier grass extract for free radical scavenging, cation radical scavenging, reducing power, and nitrite scavenging were 1,930.0, 350.0, 840.0, and $1,470.0{\mu}g/mL$, respectively. In the presence of $85.0{\mu}g/mL$ of the Napier grass extract, lipid peroxidation was potently inhibited by 74.6%.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.04a
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• pp.107-107
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• 2019

Millets are provided considerable amounts of nutrients and gluten-free cereal products and their rich non-nutritional compounds having proven health benefits, especially phenolic compounds. The aim of present investigation was to determine phenolic composition and antioxidant and SOD activity of three different millet of genetic resources namely, foxtail, proso and finger millet. Phenolic compounds were extracted from dehulled grain of genetic resources using methanol and examined for their total phenolic content (TPC), antioxidant activities and superoxide dismutase (SOD)-like activity. The TPC range of hog millet, finger millet and finger millet range from 3.3 to 25.1, 11.1 to 29.0 and 3.8 to 94.3 gallic acid equivalent (GAE)mg/g, respectively. Most of TCP content in dehulled millet grains was distributed from 10 to 20 gallic acid equivalent (GAE)/g, but two accessions of finger millet (IT235690 and 235689) were showed over than 90. The antioxidant activities were measured by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity. Finger millet and hog millet showed 26.4% and 26.7% in the mean of DPPH scavenging activity percentage, but foxtail millet was 13%. The finger millet showed the higher value than hog and foxtail millet in superoxide dismutase (SOD)-like activity. Particularly, two accessions of finger millet (IT235690 and 235689) showed the highest phenolic content and antioxidant activities among the used millet genetic resources and will be primary resources for finger millet breeding to develop the appropriate breeding strategies.

• Journal of Convergence for Information Technology
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• v.11 no.4
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• pp.186-193
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• 2021

Ciona intestinalis and Ciona savignyi have been designated as hazardous species because they have caused great damages as they appeared in ports, ships, and farms in Korea in large amount. Therefore, in terms of using them, the possibility of use as cosmetic ingredients was examined. C. intestinalis and C. savignyi were treated with 70% ethanol to make an extract and then their antioxidant activity was measured. C. intestinalis and C. savignyi showed 71.80% and 21.40% of DPPH at 20mg/mL of extract, respectively. ABTS was 95.47% and 27.53%, while nitric oxide production inhibitory ability was 97.47% and 88.90%, respectively. Total phenol content was 0.081 and 0.041 mg gallic acid/mg extract, respectively. As a result, C. intestinalis showed somewhat higher antioxidant activity than C. savignyi. It is confirmed that these extracts are animal-derived antioxidants that can be used as cosmetic materials.

• Journal of the Korean Society of Food Science and Nutrition
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• v.45 no.11
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• pp.1685-1690
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• 2016

Xanthine oxidase (XO) inhibitors play an important role in the treatment of gout and many other diseases related to superoxide anion metabolism. In this study, four commercial fruit juices and three vinegars were evaluated for their inhibitory activity of XO (XOI), as well as contents of organic acids by HPLC with UV detection. Five different organic acids were detected in commercial samples: acetic acid and malic acid were the most prominent in vinegars and fruit juices, respectively. The vinegars showed high XOI activity (33.8~64.9%) related to the great concentration of acetic acid ($R^2=0.7192$). The presence of acetic acid in vinegar could be responsible for its XOI effect.

• Journal of the Korean Wood Science and Technology
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• v.15 no.4
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• pp.59-63
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• 1987

As the production of chestnuts from chestnut trees has been increased annually in the past several years in this country, developing the utilities of chestnut bur has been considered as one of main research problems. Therefore. in this paper, the chemical components were analysed to find a way of utilizing the chestnut bur. It was proved that chestnut bur is abundant in extractives (hot water 16.0%, 1%-NaOH 40.6%) and tannin content (16.5%). Of the tannin, the soluble tannin (3.2%) content is higher than condensed tannin (2.2%), and gallic acid content(3.3-3.9%) is slightly higher than ellagic acid(2.8-3.0%), For more effectively utilizing as a tannin resources, the chestnut bur should be collected immediately after yield of chestnuts, maybe in October every year.

• Journal of Forest and Environmental Science
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• v.23 no.1
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• pp.1-4
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• 2007

The bark of Juglans mandshurica Maxim. was collected, extracted with acetone-$H_2O$ (7:3, v/v), fractioned with n-hexane, $CH_2Cl_2$ and EtOAc, then each fraction was freeze-dried to give some powders. A portion of the EtOAc (28.4 g) fraction was chromatographed on a Sephadex LH-20 column eluting with a series of MeOH-$H_2O$ and EtOH-hexane mixture. Four gallotannins, gallic acid (1), ellagic acid (2), 1,2,4,6-tetra-O-galloyl-${\beta}$-D-glucose (3) and 1,2,3,4,6-penta-O-galloyl-${\beta}$-D-glucose (4), have been isolated from the EtOAc fraction Their structures were elucidated on the basis of chemical evidence and spectrometric analysis such as NMR and MS. The antioxidant activities on each fraction and the isolated gallotannins were evaluated by DPPH radical scavenging test.

• Preventive Nutrition and Food Science
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• v.16 no.4
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• pp.328-332
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• 2011

After preparation of acetone, ethanol, methanol, and water extracts (10 g/300 mL) of dried persimmon (Diospyros kaki cv. Fuyu) flower-buds, total phenolic contents (TPC), 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity (RSA), 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) RSA, reducing power (RP), and tyrosinase inhibitory activity of the extracts were evaluated. The methanol extracts produced the highest TPC (113.39 mg gallic acid equivalents/g), DPPH RSA ($IC_{50}=40.25\;{\mu}g/mL$), ABTS RSA ($IC_{50}=58.17\;{\mu}g/mL$) and RP ($IC_{50}=69.43\;{\mu}g/mL$) activities while the water extracts generated the lowest values. The ethanol extract showed the highest tyrosinase inhibitor activity (88.90%) at a concentration of 1 mg/mL. These results indicated that persimmon flower-buds may be a useful source of natural antioxidants.

• The Korean Journal of Food And Nutrition
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• v.29 no.1
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• pp.58-64
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• 2016

This study was conducted to investigate the health effects of the general components of acorns in animals. In Korea, acorns have been used as food material in the form of acorn starch. Acorns contain tannin, gallic acid, digallic acid, and gallotannin. Therefore, the health effects of acorns as functional food are actively being studied. The chemical composition of acorns may vary according to the harvest time, region, and breed. Acorns have excellent antioxidant properties and might be beneficial in controlling hyperlipidemia, obesity, cardiovascular disease, and dementia, as well as strengthening immune competence. Further study is necessary to better understand the benefits of acorns, as it is expected to represent a large part of the food industry.