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이무열,신소림,박선희,김나래,장영득,이철희,Lee, Moo-Yeul,Shin, So-Lim,Park, Seon-Hee,Kim, Na-Rae,Chang, Young-Deug,Lee, Cheol-Hee 한국자원식물학회 2009 한국자원식물학회지 Vol.22 No.4
This study was conducted to develop functional sprout vegetables with antioxidant effects using seeds of Arctium lappa. The seeds germinated vigorously under light at $25^{\circ}C$, reaching germination rate of 82% within 4 days. Germinated seeds were placed under darkness at various temperatures to force growth in length, and it was demonatrated that $20^{\circ}C$ was optimum temperature. Greening treatment reduced growth in length, but promoted growth of cotyledons. Harvested A. lappa sprout vegetables maintained freshness longer at $10^{\circ}C$, rather than $4^{\circ}C$. Ventilation holes in storage containers had no effects on storage periods. Antioxidant activity of vegetable that received greening treatment for 1-3 days was investigated, and it was shown that free radical scavenging effects and ferrous ion chelating effects was higher than those of commercially available brocoli, cauliflower, pea and bean sprout. Contents of total polyphenol and flavonoid were also higher, especially by 3 day greening. The longer the treatment, the more the inhibition on peroxidation of linoleic acid. Sprout vegetable of A. lappa had higher antioxidant activity compared with adult plant. In conclusion, sprout vegetable of A. lappa has great potentiality for use as one of sprout vegetables. 우엉 종자를 이용하여 항산화 기능성 새싹채소를 개발하기 위하여 실험을 수행하였다. 우엉 종자는 $25^{\circ}C$ 명조건에서 발아가 가장 왕성하였으며, 4일만에 82%가 발아하였다. 발아 종자를 암조건에서 재배한 결과, $20^{\circ}C$에서 길이 생장이 가장 왕성하였다. 녹화처리는 새싹의 길이생장을 억제하였으나, 자엽의 길이 및 부피생장을 촉진하였다. 수확 후 예냉하여 포장한 우엉 새싹채소는 $4^{\circ}C$보다 $10^{\circ}C$에서 저장할 때 저장 기간이 증가되었다. 포장용기의 통기구는 저장 기간에 영향을 주지 않았다. 0, 1, 2, 3일 녹화처리한 새싹채소의 항산화 활성을 분석한 결과, 우엉 새싹채소의 radical 소거능 및 ferrous ion chelating 효과는 시판중인 브로컬리, 적채, 완두의 새싹채소 및 콩나물보다 우수하였다. 총 폴리페놀 및 플라보노이드의 함량 또한 우수하였으며, 특히 3일 녹화시킨 우엉 새싹채소에서 가장 높은 함량을 보였다. 지질과산화 억제활성은 녹화처리가 길어질수록 우수하였다. 우엉 새싹채소는 우엉의 성체 잎줄기 보다 항산화 효과가 우수하였다. 따라서 우엉 새싹채소는 기능성 채소로써 이용가치가 높은 것으로 생각된다.
이무열,김형준,정관영,한아름,곽상규,김범준,오준학 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Sensors based on organic field-effect transistor (OFETs) platform have attracted great interest owing to their high potentials in light-weight, flexibility, and large area electronics. However, organic semiconductors have critical drawback to become a ‘practical’ sensor; poor resistance of organic semiconductors in common organic solvents. For this drawback, OFET-based sensors have been only demonstrated with vapor- and aqueous-phase analytes. Herein, we demonstrate the highly sensitive and selective OFET-based sensors based on solvent-resistant semiconducting layers. The cross-linked P3HT-azide copolymer has been introduced to increase the chemical resistance of the devices toward organic solvents. Various sensing demonstration were conducted by using various liquid-phase organic solvents and pH solutions.
이무열,홍자연,이은광,이해랑,박철희,이원오,이제욱,오준학 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
There is growing interest in sensors based on organic field-effect transistor (OFET) platform due to its use as wearable electronic devices. Although textile is one of the strong candidates for wearable electronics because of its high flexibility, textile is hard to be utilized as the substrate because of its high surface roughness. Herein, we report highly flexible photosensors based on a buffered textile substrate. Electrospun organic nanofibers were used as active layer for the sensors. As a result, textile-based OFETs showed high electrical performance and mechanical stability with low bending radius (~ 1.0 mm). Furthermore, photoresponsive characteristics of the devices have been investigated under irradiation of various wavelengths. The results showed possibility of application for our devices toward the wearable photosensors.
이무열,김형준,장한빛,박종민,김범준,오준학 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Organic field-effect transistors (OFETs) have recently attracted great interest due to their various advantages for next-generation electronics, such as flexibility, light-weight, and low cost. However, conjugated polymer suffers from poor stability when it exposed to external environmental factors, which limits their practical applications. The poor chemical resistance of organic semiconductors in electronics is a significant drawback which needs to be improved for their applications such as chemical sensors that could detect chemical species via direct contact. Herein, azide functional group was introduced at the side chain to facilitate both the enhancement of resistance toward liquidphase organic solvents and maintenance of the charge transport characteristics through UV cross-linking. The cross-linked polymerbased OFETs showed excellent solvent resistant properties upon the exposure of organic solvents.
이무열,김형준,정관영,한아름,박종민,곽상규,김범준,오준학 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
An organic field-effect transistor (OFET)-based sensors have been demonstrated for sensing various types of analytes including chemicals, biological species, light, and pressure. In general, however, conjugated polymers suffer from poor chemical resistance toward liquid-phase organic solvents, which limits their practical applications to commercial electronic devices. Herein, we demonstrate solvent-resistant OFETbased sensors using cross-linkable organic semiconductor. Calixarene derivatives have been adopted to increase the sensitivity and selectivity of the OFET-based sensors. Various liquid-phase organic solvents have been tested successfully, and reliable sensing responses have been obtained. Our findings demonstrate a novel methodology for the fabrication of high-performance organic sensors and extend the practical applications of OFET-based sensors.