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과열증기처리 반탄화 추출물의 항산화 효과 검증에 관한 연구
오근혜(Geun Hye Oh),남정빈(Jeong Bin Nam),양승민(Seung Min Yang),정원희(Won Hee Joung),정진산(Jin San Jeong),신종민(Jong Min Shin),강석구(Seog Goo Kang) 한국펄프·종이공학회 2018 펄프.종이기술 Vol.50 No.2
The antioxidant properties of the extracts from torrefied wood subjected to superheated steam treatment were investigated. Total polyphenolics, total flavonoids, DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging activity, reducing power, and FRAP (Ferric reducing antioxidant power) were determined to evaluate antioxidant activity. The total polyphenol content was 879.67±40.41 ㎎/mL at a concentration of 25 g/mL when the extract was subjected to a temperature of 300℃ for 10 min, and 759.67±25.17 ㎎/mL at a concentration of 25 g/mL at 350℃ for 10 min. The value of at 300℃ was 15.79% higher than that obtained at 350℃. Total flavonoid content was 111.18±3.55 ㎎/mL at a concentration of 25 g/mL at 300℃ for 10 min, and 80.58±2.58 ㎎/mL at a concentration of 25 g/mL at 350℃ for 10 min. The value at 300℃ was 37.97% higher than that obtained at 350℃. For the DPPH free radical scavenging activity, the highest scavenging activity was observed at a concentration of 6 g/mL. DPPH free radical scavenging activity at a concentration of 6 g/mL at 300℃ for 10 min was 89.83±0.03%, whereas at 350℃ for 10 min at the same concentration, it was found to be 87.99±0.1%. The value at 300℃ was 2.09% higher than that obtained at 350℃. Reducing power was determined to be 3.59±0.04 at a concentration of 25 g/mL at 300℃ for 10 min, and 2.92±0.1 at a concentration of 25 g/mL at 350℃ for 10 min. The value at 300℃ was 22.94% higher than that obtained at 350℃. FRAP was 1742±37 μM at a concentration of 25 g/mL at 300℃ for 10 min, and 1106±8 μM at a at 350℃ for 10 min. At 300℃, the FRAP value was 57.50% higher than that obtained at 350℃. Based on these results, we suggest that torrefied wood treated with superheated steam can be used in various applications because of its effective antioxidant properties.
양승민(Seung Min Yang),이현재(Hyun Jea Lee),남정빈(Jeong Bin Nam),오근혜(Geun Hye Oh),이석언(Seok Eon Lee),강석구(Seog Goo Kang) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.6
This study was conducted to investigate the feasibility of using positively charged torrefied wood flour (TWF) from an damaged wood by pest for raw material of pellet and particle boards. The positively charged torrefied wood flour was evaluated for zeta potential to measure surface charge, removal efficiency of turbidity, optical density, chlorophyll-a, PO4-P as algal bloom remover. The zeta potential of the algal bloom was negatively charged. But The samples prepared through the surface modification treatment exhibited a positive zeta potential of -0.2 mV ~ 31.2 mV. The addition of positively charged torrefied wood flour reduced the turbidity from 83.8 ntu at the initial time to 10 ntu after 8 hours. Optical density results were similar to turbidity. The removal rate of chlorophyll-a was 92% after 8 hours. The removal rate of dissolved phosphorus, which is a cause of algal bloom, was 6.5% for activated carbon and 10% for TWF C-PAM 3 wt%. Therefore, the usefulness as algal bloom remover was confirmed through the results of the removal rate turbidity, optical density, chlorophyll-a, and PO₄-P.
국산 낙엽송으로 제조한 에코우드포트(Eco Wood pots)의 식물 생장 효과에 관한 연구
오근혜(Geun Hye Oh),김희진(Hee-jin Kim),양승민(Seong-min Yang),남정빈(Jeong Bin Nam),강석구(Seog-goo Kang) 한국가구학회 2018 한국가구학회지 Vol.29 No.1
The purpose of this study was to develop wood pots for create Optimum environment of plant growth using unused wood. to prove this, we examined the effects of cycle of water supply and nutrient concentration in wood pots on plant germination rate and growth factors (leaf number, stem diameter and length). The results are as follows. 1) The growth rate was higher at once of 2 days watering period. This suggests that the growth of the plants was better than that of the less water because the larch pots itself has the water retention capacity inside. 2) Germination rate and growth rate were better than other treatment groups when the concentration of nutrient solution was 0.5%. 3) Nitrogen, available phosphoric acid, and potassium showed higher contents than the nutrient - treated soil at 0.5% concentration of nutrient solution. This indicates that the nutrient solution absorbed from the larch affected the soil and plant growth in the inside.
반탄화 목분을 이용한 계면활성제의 흡착 및 생태독성에 관한 연구
이석언(Seok Eon Lee),오영환(Young Hwan Oh),이학주(Hak Joo Lee),한현조(Hyun Jo Han),남정빈(Jeong Bin Nam),양승민(Seung Min Yang),강석구(Seog Goo Kang) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.6
The area with damaged wood by pest in Korea currently covers about 10.1 thousand hectares, which is annually increasing. In this study, an application possibility of torrefied wood flour made from those damaged wood as a water treatment agent has been examined as compared with activated carbon, the existing one. Torrefied wood flour has been manufactured out of damaged wood by pest under the condition of high heat treatment, and an experiment with surfactant on the effect of water treatment has been conducted using to the torrefied wood flour through this study. While surfactant is a major cause of water pollution, it is being used in various ways such as medicine, detergent and agricultural chemicals, which brings about many social problems. In the experiment, adsorbent was mixed with C-PAM, torrefied wood flour and activated carbon in a ratio of ten to one respectively. Also, activated carbon, a current water treatment agent, was to be used as comparative material. Biodegradability, adsorption performance according to the change of concentration, and ecotoxicity value of surfactant has been tested in this study to figure out its possibility as an adsorbent. It has been confirmed that the surfactant degraded by about 90% within 15 days. In the light of the change in concentration of surfactant, both torrefied wood flour and activated carbon have the adsorption capacity as surfactant. It appeared that the adsorption performance of torrefied wood flour was about 20% higher than that of activated carbon when its dosage condition was 2%. In addition, the TU value in ecotoxicity from the filtrate of the processed torrefied wood flour with the highest adsorption. In conclusion of the study, it has been confirmed that, based on the result of ecotoxicity value and adsorption performance of surfactant, torrefied wood flour has an application possibility as a water treatment agent which can replace activated carbon.