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친환경 계면활성제 Potassium Cocoyl Glycinate (PCG)가 알칼리 전처리된 백합나무의 효소 당화에 미치는 영향
민병철(Byeong-Cheol Min),정수빈(Subin Jeong),송우용(Woo-Yong Song),성현아(Hyun-A Seong),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2018 펄프.종이기술 Vol.50 No.1
Potassium cocoyl glycinate (PCG) as a green surfactant was used to evaluate the possibility to substitute petrochemical surfactants for productivity improvement of enzymatic hydrolysis. Yellow poplar (Liriodendron tulipifera L. ) was subjected to NaOH (0.1%, 1.0% and 10.0%) pretreatment at 121°C for 60 min. Pretreated substrate (5.0% w/v) was hydrolyzed by enzyme under the variety PCG concentrations up to 0.3%. The optimum dose of PCG was around 0.03% at which it resulted in the highest total sugar production for all pretreatment conditions. The total sugar production of pretreated yellow poplar with 0.1%, 1.0% and 10.0% of NaOH increased from 2.3, 20.1, 20.8 g/L to 7.7, 25.7, 31.8 g/L under 0.03% of PCG concentration at 72 h hydrolysis. The effect of PCG to improve enzymatic hydrolysis was significantly promising as compared to other researches applying surfactants for hydrolysis. In conclusion, application of PCG was a promising alternative to replace petrochemical surfactants in enzymatic hydrolysis processes due to the high sugar production and positive influence on the ecosystem.
셀룰로오스 분해 능력을 갖는 세균의 셀룰로오스 나노 섬유 현탁액 오염 방지를 위한 첨가제 탐색
송우용(Woo-Yong Song),박태현(Tae Hyeon Park),전소영(Soyoung Juhn),성현아(Hyun-A Seong),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.4
To prevent cellulase-containing bacterial contamination in cellulose nanofibril suspension, addition of preservatives in suspension was investigated. Without preservatives, viscosity was drastically decreased 74.8% by S. xylosus and 78.1% by B. subtilis. With more than 1.2% of phenoxyethanol addition, there was no bacterial contamination with small viscosity decrease. With 1.2% of 1,2-hexanediol addition, there was bacterial contamination observed by microscopic obervation and viscosity decrease. With 1.6% of 1,2-hexanediol addition, there was small bacterial contamination but no viscosity decrease. In case of sodium azide addition, this was less effective as preservatives than phenoxyethanol or 1,2-hexanediol.
나노 입도 분석기를 사용한 셀룰로오스 나노섬유의 폭과 크기 측정
송우용(Woo-Yong Song),전소영(Soyoung Juhn),곽지혜(Ju Hye Gwak),신수정(Soo-Jeong Shin),성현아(Hyun-A Seong) 한국펄프·종이공학회 2019 펄프.종이技術 Vol.51 No.1
Applications of cellulose nanofibril are highly dependent on its dimension (length and width). Quick and easy methods for measuring cellulose nanofibril dimensions are critical in process quality control. A nanoparticle size analyzer (Dynamic laser scattering) was applied for cellulose nanofibril characterization and two distinct peak areas were observed as one was its width (2-50 nm) and another was its length (100-500 nm). The width and length of the nanofibril from the nanoparticle analyzer were lower than those of TEM image analysis but each samples showed a similar trend between nanoparticle analyzer and TEM image analysis. Thus, the dynamic laser scattering nanoparticle analysis is recommended as a quality control tool for cellulose nanofibril making process for estimation of its length and width.