첫물차 노란잎과 녹색잎 자원의 아미노산 및 카테킨 함량 비교

문두경,권윤숙,이소진,권용희,송은영,김병혁 한국차학회 2023 한국차학회지 Vol.29 No.2

The tea plant leaves at the first harvest time have green, purple, yellow, and white colors. The tea plant with yellow tea leaves contained the albino tea germplasm at the Gurye-gun of Jeollanam-do in Korea. This study compared the chlorophyll, amino acid, and catechin contents at the first harvest time in tea plants with yellow leaf (YL) and green leaf (GL) by transplant and cultivation after cutting from the same site. The chlorophyll content of GL was 3.3 times higher than YL at the one bud two leaves of the first harvest time. The chroma of brightness (L), red (a), and yellow (b) were 1.4, 1.1, and 1.6 times higher in YL than in GL, respectively. On the other hand, the total amino acid was 41.0 ± 1.0 mg/g for YL and 16.0 ± 0.6 mg/g for GL, showing a 2.6 times higher amino acid content in YL than GL. The L-theanine content was also 3.0 times higher in the YL (25.8 ± 0.3 mg/g) than in the GL (8.7 ± 0.4 mg/g). The L-theanine content in the total amino acid was 62.9% for the YL and 54.4% for the GL. The other amino acid contents were 15.1 ± 0.7 mg/g for the YL and 7.3 ± 0.2 mg/g for the GL. The total catechin content was 8.96 ± 0.08 mg/g for the YL and 7.19 ± 1.22 mg/g for the GL. The (-)-epigallocatechin-3-gallate (EGCG) and (-)-epigallocatechin (ECG) contents were higher in the YL than in the GL. Nevertheless, the (-)-epigallocatechin (EGC) content of GL was 1.2 times higher than the YL. In conclusion, the YL is another cultivar compared to the GL because of its different leaf yellow color, high amino acid, and L-theanine contents than GL.

녹차 품종 추출물의 항알레르기 및 항산화 효능 평가

문두경,박샛별,김형돈,최재훈,서경혜,장귀영,이정훈,김동휘,이승은 한국약용작물학회 2018 한국약용작물학술대회 발표집 Vol.2018 No.10

Background : The health-promoting effects of green tea are mainly attributed to its polyphenol content, particularly flavanols and flavonols, which account for 30% of a fresh leaf’s dry weight, but the ingredients of the polyphenol content vary depending on the species. This study was conducted to select some candidates with superior anti-oxidative and anti-allergy effects from among seven cultivars of green tea. Methods and Results : Green tea extracts were prepared by extraction with ethanol and by evaporation of the solvent at low pressure. To evaluate their anti-allergy effect and cell viability, the samples were tested for ß-hexosaminidase inhibitory activity and MTT assay of the RBL-2H3 cells, respectively. The anti-oxidation effects of the samples were analyzed with a DPPH radical scavenging activity. According to the results of the experiment, four extracts including Camelia sinensis var. Kemsull, C. sinensis var. Beachwisull, C. sinensis var. Chamnok and C. sinensis var. Fushun showed effective ß-hexosaminidase inhibitory activity at 12.5, 25, 50, 100 ㎍/㎖. At 50 ㎍/㎖, C. sinensis var. Saemidori had the highest cell viability as 86.1%, and all of the samples showed cell proliferation above 70% at 25 ㎍/㎖. The extract of C. sinensis var. Kemsull showed a 60 - 70% inhibitory effect on the DPPH radical at all of the tested concentrations, whereas the extracts of C. sinensis var. Ryohu, C. sinensis var. Saemidori, C. sinensis var. Yabukita showed lower DPPH inhibition effects at around 10 - 30%. Conclusion : The results of this study indicate that the extracts of C. sinensis var. Kemsull, C. sinensis var. Beachwisull, and C. sinensis var. Chamnok have more prominent anti-oxidation and anti-allergy effects than other cultivars, and thus could be utilized as resources for improving health.

암면배지의 수분제어가 토마토의 생육 및 생산성에 미치는 영향

문두경,김소희,조명환,유인호,류희룡,최경이,권용희,이소진 한국농림기상학회 2018 한국농림기상학회지 Vol.20 No.2

This study was carried out to investigate the effect of plant growth and production of tomato (Lycopersicon Esculentum Mill cv. Tefunis) according to the water content of non-recycled rockwool culture in high-rise tomato greenhouse. Daily irrigation amount was 3.8 times higher in the irrigation control by Integrated Solar Radiation (ISR) than in the Frequency Domain Reflectometry (FDR) sensor. Water content of ISR and FDR was 90-95 and 60-65%, respectively. Plant height and weight of tomato fruit was 1.2-1.9 times longer and 1.2-2.0 times heavier in the ISR than in the FDR sensor, respectively. No significantly differed to sugar content of tomato by treatments. Marketable fruits were the higher 1.3 times in the ISR compared with the FDR sensor. Cracking percentage in the ISR was also the higher 2.0 times compared with FDR sensor. Therefore, Irrigation control by ISR was appropriate to improve of plant growth and production of tomato with non-recycled rockwool culture in greenhouse during long-term cultivation. 고측고 토마토 전용 하우스에서 비순환식 토마토 암면재배 시 배지 내 수분함량이 토마토 ‘데프니스’ 품종의 생육 및 과실의 생산성에 미치는 영향을 보고자 수행하였다. 양액공급량은 일사량제어가 FDR센서 수분제어보다 3.8배 많았다. 일사량제어의 수분함량은 90-95%였고, FDR센서 수분제어의 수분함량은 60-65%였다. 초장의 길이 및 토마토의 과중은 일사량 제어가 FDR센서 수분제어보다 1.2-1.9배 길었고, 1.2-2.0배 무거웠다. 상품과는 일사량 제어가 FDR센서 수분제어보다 1.3배 많았다. 과실의 당도는 처리간 차이가 없었다. 열과 발생량은 일사량 제어가 FDR센서 수분제어보다 2.0배 높았다. 따라서 비순환식 암면배지에서 토마토의 생육 및 생산성을 향상시키기 위해서는 일사량제어가 적당하다고 판단된다.

In Vitro Sugar Accumulation in Juice Sacs of ‘Shiranuhi’ Mandarin

문두경,한승갑,좌재호,김천환,성기철 한국원예학회 2013 원예과학기술지 Vol.31 No.3

To further our understanding of sugar accumulation in ‘Shiranuhi’ mandarin [(C. unshiu × C. sinensis)× C. reticulate], we investigated the patterns of sugar uptake in juice sacs exposed to different concentrations of sucrose, fructose and glucose in vitro. Data was also collected on the change in weight and shape of the in vitro juice sacs over time. Soluble solids content, sugar content and acidity content were highest at 20% sucrose, fructose and glucose solution content; while fructose content was highest at 5% sucrose concentration. Furthermore, the juice sac’s fresh weight was highest at 5% sucrose and lowest at 20% fructose content. The shape of the juice sacs also differed in different sugar concentration and type. Overall, sucrose,fructose and glucose content in juice sacs increased with the sugar concentration. These results suggest that sugar translocation into juice sacs is actively induced by high sugar concentration in the medium. Thus, it can be concluded that sugar and acid accumulation in juice sacs increased with sugar concentration in vitro culture.

Effect for using thienothiophene spacers of quinacridone based polymer

문두경,김효열,최민희,한용운 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

During the past decade, bulk heterojunction (BHJ) polymer solar cells (PSCs) have been the focus of both scientific research and industrial application, because of their potential applications in large area, lightweight, flexible photovoltaic devices through low-cost solution-processable techniques. We designed and synthesized a of D-π-A copolymer based on quinacridone (QC) donor unit and benzooxadiazole (BO) acceptor unit bridged thienothiophene. Thienothiophene (TT) bridge is propitious to enhance both hole mobility and photovoltaic performance of the D-π-A copolymers. In this study, we synthesized a new thieno [3,2-b]thiophene bridged D-π-A copolymer, PQCDttBO, using suzuki coupling reaction. The synthesized polymer is showed physical, optical, electrochemical and photovoltaic properties.

플렉시블 유기 전자 소자를 위한 비정질 투명전극

문두경 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

최근 유기 전계 발광소자 (organic light emitting diode, OLED), 유기태양전지(organic photovoltaic, OPV), 유기 박막 트랜지스터 (organic-thin film transistor, OTFT) 등의 플렉시블 전자소자에 대한 요구가 커지면서, 핵심 부품인 플렉시블 투명전극에 대한 산업계의 관심이 증가하고 있다. 현재, 디스플레이, 태양전지 분야에서 인듐 주석 산화물(indium tin oxide, ITO)이 투명전극으로 주로 사용되고 있다. ITO는 우수한 광투과성, 전기전도성을 보이지만, 휘거나 굽혔을 때, 깨지기 쉽고, 플라스틱 기판의 유리전이 온도 이상의 고온 공정이 수반되기 때문에, 플렉시블 유기 전자 소자의 투명전극으로 사용하기 어렵다는 한계를 보인다. 이에 본 발표에서는, 연구팀에서 개발한 비정질 플렉시블 투명전극 소재와 이를 OLED, OPV 등의 유기 전자 소자에 적용하여 플렉시블 유기 전자 소자를 구현한 연구성과를 소개한다.

유기태양전지의 소재 및 연구 동향

문두경 한국공업화학회 2008 한국공업화학회 연구논문 초록집 Vol.2008 No.1

PE 및 PP 수급 동향

문두경,Mun, Du-Gyeong (사)한국포장협회 2006 包裝界 Vol.161 No.-

Plant Growth and Fruit Quality as Affected by Canopy Locations in ‘Shiranuhi’ Mandarin

문두경,좌재호,문영열,성기철,김천환,안율균 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.5

Fruit quality (soluble solids and acidity) and growth properties of fruiting branches in different canopy positions (upper, middle, and lower) of ‘Shiranuhi’ mandarin [(C. unshiu × C. sinensis) × C. reticulate] trees were determined during fruit maturation. Length, diameter, and number of leaves per fruiting branch increased in order from the upper, through the middle, to the lower parts of the canopy. Fruit diameter, fruit weight, pulp weight and pulp thickness were also highest in the upper part. Transverse sections of stem end protrusions in fruit from the upper, middle, and lower parts of the tree canopy were 37.3 ± 2.3 mm, 33.2 ± 0.2 mm and 32.1 ± 0.4 mm, respectively. Soluble solid content increased during fruit maturation at all locations within the canopy and was highest in the upper part. Likewise, acid content decreased with fruit maturity and was lowest in the lower part. These results suggested that harvesting be staggered starting with fruit from the upper part of the canopy as part of crop management in ‘Shiranuhi’ mandarin for direct effect on fruit quality.

Sugars and Organic Acid Contents in Different Parts of Juice Sacs in ‘Shiranuhi’ Mandarin Fruit at Harvest

문두경,고상욱,성기철,현해남 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.6

Sugar and organic acid contents in different parts of juice sacs in ‘Shiranuhi’ mandarin ([Citrus unshiu × C. sinensis] × C. reticulata) fruit were determined at harvest. Total sugar and sucrose contents increased from the center parts outwards of juice sacs, while reducing sugar (fructose and glucose) contents increased inwards from the outer to central parts. Sucrose/hexose ratios ranged from 1.31 to 1.59 in different parts of juice sacs, with the central parts showing the lowest ratios. Citric acid content was the highest whereas malic and oxalic acid contents were the lowest in the central parts of juice sacs. These results suggest that sugar accumulation in the central parts of juice sacs in ‘Shiranuhi’ mandarin fruit continues in the radial direction up to the latest stages of maturation.