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Shabina Yeasmin,Chul-Hawn Kim,J-Y Lee,M. I. Sheikh,H-J Park,S-H Kim,G-C Kim,J-W Kim 한국펄프·종이공학회 2011 한국펄프·종이공학회 학술발표논문집 Vol.2011 No.4
The experiment was conducted to evaluate the different NaOH pretreatment concentrations (0.25%, 0.50%, 0.75%, and 1.00%) on enzymatic saccharification (with cellulase, and β-glucosidase) and fermentation (by Saccharomyces cerevisiaeKCCM 11304) for bioethanol production from rice straw and rice husk. Pretreatment of rice straw and rice husk were conducted under both natural and powder state to observe the potentiality of the biomass condition (natural and powder state). In this study, glucose and ethanol production were increased with the increase of NaOH percentage for both rice straw and rice husk (natural and powder state). For rice straw, the highest amount of glucose was obtained in 1.00% NaOH pretreatment (0.81 g g?¹ in a natural, and 0.63 g g?¹ in a powder state pretreatment). Similarly, for rice husk, the highest amount of glucose was obtained in 1.00% NaOH pretreatment (0.47 g g?¹ in a natural, and 0.46 g g?¹ lin a powder state pretreatment). However, 0.75% NaOH pretreatment resulted in glucose yield near about 1.00% NaOH pretreatment for both rice straw and rice husk (natural and powder state). On the other hand, for rice straw, the highest amount of ethanol was obtained in 1.00% NaOH pretreatment (0.36 g g?¹ in a natural, and 0.31 g g?¹ in a powder state pretreatment). In addition, for rice husk, the highest amount of ethanol was also obtained in 1.00% NaOH pretreatment (0.24 g g?¹ in a natural, and 0.23 g g?¹ in a powder state pretreatment). Moreover, 0.75% NaOH pretreatment resulted in ethanol yield near about 1.00% NaOH pretreatment for both rice straw and rice husk (natural and powder state). It was confirmed that higher amount of NaOH use is cost effective. Moreover, higher amount of glucose and ethanol was observed when powder was prepared after pretreatment. So 0.75% NaOH pretreatment in a natural state is supposed to be suitable for enzymatic saccharification and fermentation for bioethanol production.
Sabina Yeasmin,Il Jun Kwon,Dong Jun Kwon,Jungeon Lee,Jeong Hyun Yeum,Byung Chul Ji,Jae Min Park,Seong Baek Yang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
In this study, pullulan (PULL) nanocomposite films containing tempo cellulose nanofibrils (TOCNs) and Agnanoparticles were successfully prepared using a solution casting technique in aqueous solutions. X-ray diffraction resultsand optical microscopy images revealed the coexistence of Ag and PULL/TOCNs blend matrix as well as the uniformdistribution of Ag nanoparticles. The Fourier-transform infrared data showed that a good interaction occurred betweenTOCNs, Ag, and PULL matrix; the prepared composite film showed improved characteristics including higher tensilestrength, thermal stability, water barrier properties and reduced moisture susceptibility compared to a neat PULL film. Inaddition, the prepared film is biodegradable and possesses antimicrobial characteristics. These excellent properties clearlyindicate that this type of ternary nanocomposite film may have prospective food packaging and medical application.
Conversion of bioethanol from old paper money bill by separate hydrolysisand fermentation
Shabina Yeasmin,Chul-Hawn Kim,Mominul Islam Sheikh,Hyun-Jin Park,Sung-Ho Kim,Jee-Young Lee 한국펄프·종이공학회 2010 한국펄프·종이공학회 학술발표논문집 Vol.2010 No.10
Paper money billis believed to be one of the mostpromising feedstock for near-term commercial application oftechnology for converting cellulosic raw materials intocommodity products. In this study, we conducted saccharification of waste papermoney using cellulase and β-glucosidase enzyme. Finally, we carried fermentation of paper money glucose by Saccharomyces cerevisiae KCCM 11304. By the separate hydrolysis and fermentation, we got 0.65 ㎎/g ethanol. Paper money can be used for simultaneous saccharification and fermentation.
Benzylideneacetone and other phenylethylamide bacterial metabolites induce apoptosis to kill insects
Mollah Md. Mahi Imam,Yeasmin Fatema,김용균 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
Xenorhabdus and Photorhabdus are entomopathogenic bacteria that can induce immunosuppression against target insects by suppressing eicosanoid biosynthesis, leading to fatal septicemia. These bacteria can synthesize and release secondary metabolites such as benzylideneacetone (BZA) and other phenylethylamide compounds that can inhibit phospholipase A 2 (PLA 2 ) and shut down eicosanoid biosynthesis. However, insecticidal activities of these bacterial metabolites remain unclear. Thus, the objective of this study was to assess cytotoxicities of BZA and seven other bacterial metabolites to insect cells. These eight bacterial metabolites exhibited significant cytotoxicities against an insect cell line Sf9 at micromolar range. Especially, BZA and cPY were highly potent at low micromolar range. When these eight bacterial metabolites were injected to hemocoels of Spodoptera exigua larvae, they significantly decreased total count of hemocytes. In Sf9 cell line and hemocytes, these bacterial metabolites induced cell membrane blebbings, apoptotic vesicles, and genomic DNA fragmentation. Terminal deoxyribonucleotidyl transferase nick end translation assay showed that these bacterial metabolites caused significant DNA breakages in cells in a dose-dependent manner. However, a pan caspase inhibitor treatment significantly rescued the cell death induced by these bacterial metabolites. Cytotoxicities of these bacterial metabolites were highly correlated with their insecticidal activities. These results indicate that the insecticidal activities of the bacterial metabolites may be induced by their apoptotic activities against hemocytes and other insect cells. Taken together, these results suggest that phenylethylamide compounds might have potential as novel insecticides.