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습식방사를 통한 밀 글리아딘 섬유 제조에 머캅토에탄올이 미치는 영향
곽효원,윤나경,이다정,이기훈,Kwak, Hyo Won,Yun, Na Kyong,Lee, Da Jeong,Lee, Ki Hoon 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.3
Wheat gliadin is an ethanol-soluble fraction of wheat protein. It has several intramolecular disulfide bonds, which are cleavable by reductants such as 2-mercaptoethanol. We added 2-mercaptoethanol into the dope solution prepared by dissolving wheat gliadin in DMSO. The dope solution was spun into an acetone/methanol coagulation bath. The viscosity of the dope solution was increased and the spinnability was also improved by the addition of 2-mercaptoethanol. A maximum draw ratio of 3.5 was achieved with the addition of 2-mercaptoethanol whereas, that of non-added fiber was only 2. Furthermore, the mechanical properties of the fiber were slightly improved by the addition of 2-mercaptoethanol. These positive effects are due to the increase of chain entanglement by the cleavage of intramolecular disulfide bonds.
Monitoring of phase separation between silk fibroin and sericin using various dye system
곽효원,이기훈 한국잠사학회 2015 International Journal of Industrial Entomology Vol.30 No.1
Understanding the interactions between fibroin and sericin is crucial in solving the mechanismof silk spinning. In this study, various commercially available dyes were used to monitor theinterface between fibroin and sericin during the gelation of fibroin. The phase separationbetween fibroin and sericin could be observed by the addition of azo dyes over a certainmolecular weight. Furthermore, the addition of the dyes to the sericin layer showed vividphase separation over addition to the fibroin layer
Chromium(VI) Adsorption Behavior of Silk Sericin Beads
곽효원,양예솔,김무곤,이정윤,윤혜성,김민화,이기훈 한국잠사학회 2013 International Journal of Industrial Entomology Vol.26 No.1
Silk sericin (SS) has been fabricated into beads using a 1 M LiCl/DMSO solvent and utilizedas a heavy metal adsorbent. Among the various heavy metals, we targeted Cr(VI) foradsorption using SS beads and found that its adsorption depended on the coagulant usedfor the fabrication of the SS beads. When methanol was used as a coagulant, the beads hada better adsorption capacity than when ethanol was used except at pH 1. The adsorptionbehavior of Cr(VI) on the SS beads followed the BET isotherm. The maximum adsorptioncapacity was 33.76 mg/g at pH 2. The adsorption of Cr(VI) was confirmed by FT-IR and EDSanalyses. Finally, the desorption was carried out using NaOH solution, and it was found that73.19% of the adsorbed Cr(VI) could be detached.