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Two-stage 산 처리에 의한 목질계 바이오매스로부터 푸르푸랄 생산과 회수
신경진 ( Gyeong Jin Shin ),정소연 ( So Yeon Jeong ),이홍주 ( Hong Joo Lee ),이재원 ( Jae Won Lee ) 한국목재공학회 2015 목재공학 Vol.43 No.1
In this study, we investigated optimal reaction conditions for furfural production from lignocellulosic biomass by two-stage acid treatment. Furfural produced by this method was recovered using XAD-4 resin. Oxalic and sulfuric acid were used as catalysts for the first stage of treatment. The concentration of xylose in the hydrolysate obtained from the first stage was 18.86 g/ℓ with oxalic acid and 19.35 g/ℓ with sulfuric acid. The concentration of oligosaccharide was relatively high when sulfuric acid was used. Maximum yield of furfural, that is, 55.10% (6.71 g/ℓ), was obtained when oxalic acid was used for the first stage and 0.1 mℓ of sulfuric acid was used for the second stage of treatment for 90 min. Furfural production yield increased with increasing the reaction time. Most of the furfural produced by this two-stage treatment method was recovered using XAD-4 resin.
목질계 바이오매스로부터 생산된 바이오에탄올 투과증발 과정에서 발생한 투과증발 잔류물의 항산화 활성
신경진 ( Gyeong Jin Shin ),정소연 ( So Yeon Jeong ),이홍주 ( Hong Joo Lee ),이재원 ( Jae Won Lee ) 한국목재공학회 2015 목재공학 Vol.43 No.6
In this study, we produced bioethanol from the original hydrolysate obtained during oxalic acid pretreatment of lignocellulosic biomass. The bioethanol was separated and concentrated by pervaporation and the residue after pervaporation was evaluated for its antioxidant activity. Xylose (37.28 g/ℓ) was the major product in the original hydrolysate. The original hydrolysate contained acetic acid, furfural and total phenolic compounds (TPC) as fermentation inhibitors. Acetic acid was removed by electrodialysis (ED), and 12.21 g/ℓ of bioethanol was produced from ED-treated hydrolysate. The TPC of ethyl acetate extracts from the residue obtained (OA-E) during pervaporation was 86.81 mg/100 g (extract). The IC50 values of DPPH and ABTS radical scavenging activities, and reducing power of OA-E were 0.87 mg/mℓ, 0.85 mg/mℓ, and 0.59 mg/mℓ, respectively. Sugar degradation products and the phenolic compounds in OA-E were determined by GC-MS.
에탄올 생산 향상을 위한 발효저해물질 제거와 리그닌 유래 발효저해물질이 에탄올 발효에 미치는 영향
엄민 ( Min Um ),신경진 ( Gyeong-jin Shin ),이재원 ( Jae-won Lee ) 한국목재공학회 2016 목재공학 Vol.44 No.3
In this study, ethanol was produced from a biomass hydrolysate that had been treated by electrodialysis (ED) and Amberlite XAD resin to remove fermentation inhibitors. Most of the acetic acid (95.6%) was removed during the ED process. Non-ionizable compounds such as total phenolic compounds, 5-hydroxymethyl furfural, and furfural were effectively removed by the XAD resin treatment. Ethanol production was improved when the ED-treated hydrolysate was treated with XAD-4 resin for a short reaction time. The highest ethanol production from ED-treated hydrolysate was 6.16 g/ℓ (after 72 h of fermentation) when the treatment with XAD-4 resin was for 5 min. Among the ligninderived fermentation inhibitors tested, syringaldehyde in low concentrations (1 and 2 mM) in the hydrolysate increased ethanol production, whereas a high concentration (5 mM) inhibited the ethanol production process. A synthetic medium containing syringaldehyde and ferulic acid was prepared to investigate the synergistic effect of inhibitors on ethanol fermentation. Ethanol production decreased in the mixture of 1 mM syringaldehyde and 1 mM ferulic acid, implying that the effect of ferulic acid on ethanol fermentation is comparable to that of syringaldehyde.