• 한국작물학회지
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• 제49권2호
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• pp.82-88
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• 2004

The objective of this study was to determine the role of storing years with the variation of total phenol and individual phenolic compounds in soybean (Glycine max L.) seeds. The total phenol content varied from 0.36 to 0.42% over four years, with the highest value (0.42%) found at storage for two and three years. Among the nine soybean varieties examined, Daweonkong had the highest total average phenol content (0.58%). The total content of 11 phenolics varied from 730.0 to 1812.8 $\mu\textrm{g}\;\textrm{g}^{-1}$ over storage for four years, and the highest concentration (1812.8 $\mu\textrm{g}\;\textrm{g}^{-1}$) was found at storage for two years. Myeongjunamulkong (1465.4 $\mu\textrm{g}\;\textrm{g}^{-1}$) had the highest mean content among the nine soybean varieties. The total content of 11 phenolic compounds measured in this study occupied from 20.96 to 47.73% of the total phenol contents. The highest total phenol contents were in seeds with black coats (5279.4 $\mu\textrm{g}\;\textrm{g}^{-1}$), while the highest concentration of individual phenolic compounds were in seeds with green coats (1419.5 $\mu\textrm{g}\;\textrm{g}^{-1}$). Our study suggests that it may be feasible to improve soybean varieties with high functional substances such as phenolic compounds.

• 한국응용과학기술학회지
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• 제33권3호
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• pp.521-528
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• 2016

The antioxidant activity of 70% methanol, 70% ethanol and chloroform-methanol (CM, 2:1, v/v) extracts from turmeric (Curcuma longa L.) was investigated in this study. The antioxidant potential of various extracts of turmeric was evaluated by using different antioxidant tests, namely DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity, ABTS [2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt] radical scavenging activity, ferric reducing antioxidant power and ${\beta}$-carotene bleaching assays as well as total phenol content and total flavonoid content. All extracts exhibited abundant total phenol content, total flavonoid content and strong antioxidant activity. Particularly, higher activity was exhibited by CM extract with $46.32{\pm}0.35mgCAE/g$ and $15.58{\pm}0.39 mgQE/g$ of total phenol content and total flavonoid content. Generally, antioxidant activity of various extracts from turmeric increased in the following order: 70% methanol extract, 70% ethanol extract and CM extract, respectively. Results suggested that turmeric could be widely used as a source of antioxidant and a kind of functional material in food.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.290-290
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• 2017

Rice (Oryza sativa L.) is one of the most consumed staple food crop which is energy source as carbohydrate and also is considered as the important antioxidant sources including various phenolic compounds. According to the increasing demand of healthy life, the concern to antioxidant also is increasing because of its health-promoting effect. Phenolic compounds are one of the plant secondary metabolites class, which shows various benefits to preventing or treating chronic diseases. In this study, we have measured the total phenol content from total 647 rice samples using the Floin-Ciocalteau method, and then were selected 30 rice genetic resources classified with high, middle, and low group on the basis of total phenol content. The average of the total phenol content of each group was high-group ($6892.9{\pm}488.5{\mu}g\;GAE/g$) > middle-group ($1428.1{\pm}76.0{\mu}g\;GAE/g$) > low-group ($97.6{\pm}11.4{\mu}g\;GAE/g$). The selected rice samples were analyzed with LC-MS/MS to find the composition and concentration of individual phenolic in rice grain. High-group and middle-group contained large amounts of protocatechuic acid and (+)-catechin whereas low-group showed limited amount. Among high-group samples, rice samples with black pericarp color (IT 174089, IT 220079, and IT 259958) had high content of peonidin-3-O-glucoside. Further, these black rice samples were special since polydatin, rarely found stilbenoid in rice grain, was detected. Overall, both the sum of phenolic acid and the sum of flavonoid were high-group > middle-group > low-group. Also, each group exhibited different phenolic compositions; high-group consisted of flavonoid more than phenolic acid, middle-group and low-group was comprised of phenolic acid rather than flavonoid, and non-pigmented rice was composed by fully phenolic acid. The total phenol content had positive relationships with the sum of phenolic compound (r = 0.64), the sum of flavonoid (r = 0.74) at the significance level of p < 0.0001. In addition, protocatechuic acid and quercetin showed positive correlation with above phenolic composition parameters; in order, r = 0.98, 0.65 for protocatechuic acid and r = 0.73, 0.78 for quercetin (p < 0.0001). In conclusion, the total phenol content assay showed the possibility of utilization as a phenolic composition indicator in rice grain. Also, this result was suggested study pigment on other material.

• 동아시아식생활학회지
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• 제24권6호
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• pp.853-861
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• 2014

우리밀과 수입밀로 쿠키, 머핀, 바게트를 제조하여 총 페놀 함량, 항산화 효과, 단백질 소화도를 비교하였다. 또한 쿠키와 머핀 제품에 천년초와 홍화씨를 첨가하여 총 페놀 함량, 항산화 효과 및 단백질 소화도에 미치는 영향을 연구하였다. 천년초의 첨가는 우리밀 쿠키 및 머핀의 80% methanol 추출물에서 총 페놀 함량 및 항산화 효과를 증가시켰으나, 유의적인 차이는 보이지 않았다. 홍화씨 첨가는 우리밀 쿠키의 80% ethanol과 80% methanol 추출물의 총 페놀 함량을 유의적으로 증가시켜 기능성 소재의 첨가가 쿠키의 품질 특성을 향상시키는 결과를 보여주었다. 우리밀과 수입밀로 만든 쿠키, 머핀, 바게트의 80% ethanol 추출물에서 우리밀로 만든 머핀의 총 페놀 함량이 4.53 mg QE/g으로 가장 높게 나타나, 수입밀로 만든 머핀보다 약 1.5배 높게 나타났다. 80% methanol 추출물은 수입밀 바게트가 우리밀 바게트보다 약 1.2배 높게 나타나 용매에 따라 다른 경향을 나타냈다. 80% ethanol 추출물과 80% methanol 추출물의 총 페놀 함량을 비교하면 ethanol 추출물이 모든 시료에서 높은 총 페놀 함량을 보여, 우리밀에서 더 높은 총 페놀 함량을 나타냈다. 우리밀과 수입밀의 ethyl acetate 추출물의 항산화 효과는 유의적인 차이는 나타나지 않았으나, 머핀의 80% methanol 추출물은 우리밀이 수입밀보다 2.4배 가량 높은 항산화 효과를 나타냈다. 그 결과, 추출 용매에 따라 차이는 있으나, 우리밀 제품이 수입밀 제품보다 높은 항산화 효과를 가진다고 추정된다. 단백질 소화도에서 우리밀과 수입밀을 비교해 보면 모든 제품에서 유의적인 차이를 보이지 않았다. 결과적으로 단백질 소화도와 같은 품질 특성은 우리밀이 수입밀의 품질과 유사하며, 항산화 효과와 총 페놀 함량은 우리밀 제품이 우수한 결과를 보여 기능성 면에서 우수한 밀 품종이라고 사료된다.

• International Journal of Industrial Entomology and Biomaterials
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• 제9권2호
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• pp.255-259
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• 2004

Post-infectional biochemical changes due to Xanthomonas campestris pv. mori (Xcm) infection in five elite mulberry varieties viz., $S_1$, $S_{1635}$, $V_1$, RF $S_{175}$ and JRH was studied under inoculated condition. It was revealed that total soluble sugar and protein content was significantly declined in all the varieties due to X. campestris infection. Total phenol content was at par prior to inoculation in all varieties, but it was significantly increased in $S_1$, RF $S_{175}$, $S_{1635}$ and JRH 7 days after inoculation. The correlation coefficient (r) between total soluble sugar and total phenol content was found positive (r = 0.825) and statistically significant. Similarly, correlation coefficient (r) between total soluble protein and phenol content was found positive (r = 0.897) and statistically significant. The present study indicates that X. campestris infected leaves are nutritionally inferior in quality and the duration of phenol production in a mulberry variety play decisive role on disease resistance.nce.

• 생약학회지
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• 제38권1호
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• pp.90-94
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• 2007

This study was examined the chemical components and total phenol content in acorn powders of Korea and China. Korea acorn powder produced from consists of 6.85% crude protein, 3.57% crude fat and 3.33% crude ash. China acorn powder consists of 1.83% crude protein, 0.41% crude fat and 0.40% crude ash. The composition of unsaturated fatty acid of Korea acorn powder was slightly lower than China acorn powder, but there was no significant difference. The amino acid content of Korea acorn powder was higher than that of China acorn powder. Total phenol content of that Korea acorn powder was 20 mg/g, and that China acorn powder was 3.2 mg/g.

• 한국응용과학기술학회지
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• 제33권1호
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• pp.186-194
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• 2016

Consumption of fruits and vegetables has been conducted to be effective in the prevention of chronic diseases. In this study, 70% methanol, 70% ethanol and chloroform-methanol mixture (CM, 2:1, v/v) were used as solvents in the extraction of apple peels. The total phenol content, total flavonoid content and antioxidant activity of various extracts were investigated using in vitro assays. The extract obtained by 70% methanol showed the highest total phenol content ($20.87{\pm}0.17mgCAE/g$), ABTS [2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt] radical scavenging activity and ferric reducing antioxidant power. However, 70% ethanol extract possessed the strongest antioxidant activity assayed by DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity and ${\beta}$-carotene bleaching method. And CM extract was found to show the highest total flavonoid content with the value of $9.26{\pm}0.06mgQE/g$. These results indicated that apple peels can be used in dietary applications with a potential to reduce oxidative stress.

• Journal of Nutrition and Health
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• 제51권6호
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• pp.599-606
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• 2018

Purpose: Various plants, herbal medicines, and marine foodstuffs have been used in kimchi preparation to improve its overall quality. Teff, which is rich in minerals and starches, facilitates stable blood glucose levels and is well-suited for use in gluten-free products; hence, it can be used to reinforce the mineral composition of kimchi. In this study, we probed the antioxidant activities of hydrolysates prepared by treatment of brown teff with three proteases under different conditions. Methods: The mineral composition of brown teff was determined by inductively coupled plasma spectrophotometry-mass spectrometry, and we established optimal hydrolysis conditions by determining the total phenol and flavonoid contents of teff hydrolysates obtained using three different proteases (protamax, flavourzyme, and alcalase), two different protease concentrations (1 and 3 wt%), and three different incubation times (1, 2, and 4 h). The antioxidant activity of the hydrolysates was further investigated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity, total antioxidant capacity (TAC), and ferrous reducing antioxidant power (FRAP) assays. Results: Brown teff was rich in I, K, Mg, and Ca, and the highest total phenol content ($24.16{\mu}g/mL$), total flavonoid content ($69.08{\mu}g/mL$), and TAC were obtained for 1 wt% protamax treatment. However, the highest DPPH scavenging activity and FRAP values were observed for hydrolysates produced by alcalase and flavourzyme treatments, respectively. Conclusion: Treatment of brown teff with proteases affords hydrolysates with significantly increased antioxidant activities and high total phenol and flavonoid contents, and these antioxidant activities of teff hydrolysates have the potential to enhance the quality and functionality of kimchi in future applications.

• 한국식품과학회지
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• 제8권2호
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• pp.80-84
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• 1976

Lasoda와 Sebago 두 종류의 감자를 사용하여, 조리 조건을 달리 하여 conventional oven에 $218^{\circ}C$에서와 microwave oven에서 구어내어 껍질을 베끼고 cortex 부분만 취하여 전체 phenol을 분석하였다. 또한 chlorogenic acid와 caffeic acid를 표준으로 하여 thin-layer chromatography로 감자의 phenol화합물을 분석 하였다. Phenol양은 구운 감자보다 생 감자에 더 많았고, Sebago 보다 Lasoda에 많았다. 수분손실은 conventional oven에서 구운 감자에 컸고, microwave oven에서 구운 Lasoda에는 phenol양이 많았다. 또한 phenol양이 많은 Lasoda가 chlorogenic acid도 많았다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2021년도 춘계학술대회
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• pp.137-137
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• 2021

The study of total phenol (TP) content from 700 rice varieties was evaluated using the UV-Vis spectrophotometric method. The calibration curve of serial diluted gallic acid as a standard of this study showed the acceptable performances (R² = 0.999, mean accuracy 90%) and the mean of % relative standard deviation (%RSD: 0.07%) within the range of 7.8 to 1000 ppm concentrations. The mean value of total phenol content from 700 rice varieties was 2723.15 ㎍/g ranged from 55.48 ㎍/g to 9922.23 ㎍/g and the mean %RSD was 2.5%. Furthermore, this study aim was to analyze and profile individual phenolic compounds in the rice genetic resources to construct an integrative database for development of new rice variety with high functionality for health and understanding of phenolics characteristics in the rice grain. Herein, we analyzed selected 100 rice varieties based on high TP content and identified total 15 phenolic compounds by LC-ESI-MS/MS. Among selected 100 rice genetic resources, the phenolic metabolites consisted of higher amount of flavonoid (catechin) and phenolic acid mainly protocatechuic acid. Further research of more selected rice genetic resources would be continued to provide for an integrative phenolics profile of different rice genetic resources.