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- 저자 : Masahide Yasuda (검색결과 2 건)
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Masahide Yasuda,Yasuyuki Ishii,Kazuyoshi Ohta 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.6
Recently Napier grass (Pennisetum purpureumSchumach) has been recognized to meet the requirement oflignocellulosic bioethanol production, because it has lowlignin-content and a relatively high herbage mass per yearand per area. Therefore, pretreatment, saccharification, andfermentation processes for ethanol production from Napiergrass have been extensively studied. As pretreatmentmethod, acid, alkali, PBHW (pressurized batch hot water),and LMAA (low-moisture anhydrous ammonia) pretreatmentswere reviewed. As saccharification and fermentationprocess, saccharification followed by co-fermentation ofhexose and pentose, simultaneous saccharification andfermentation (SSF) followed by pentose fermentation,simultaneous saccharification and co-fermentation (SSCF)process were proposed. The SSCF was most advantageousprocess since the SSCF can prevent contamination risks ofother microorganism and can construct simple processingprocedure. An example of ethanol production from Napiergrass was a combination process of LMAA-pretreatmentwith SSCF which was performed for of LMAA-treatedNapier grass at 36°C for 96 h using cellulase, xylanase,Saccharomyces cerevisiae, and Escherichia coli KO11. The ethanol yield reached 74.1%. Thus, Napier grass wasthought to be a promising biomass for ethanol production.
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Shiragami, Tsutomu,Onitsuka, Dai,Matsumoto, Jin,Yasuda, Masahide Korean Society of Photoscience 2014 Rapid communication in photoscience Vol.3 No.4
Visible-light irradiation of MeCN solution containing di(hydroxo)metallo(tetraphenyl)porphyrin complex $(tppM(OH)_2$: 1a; $M=Sb(V)^+Br^-$, 1b; $M=P(V)^+Cl^-$, 1c; M=Ge(IV)) and 2-mercaptoethanol (2-ME) as a substrate under aerated condition gave bis(2-hydroxyethyl)disulfide (2-HEDS) as an oxidative product of 2-ME. It is indicated that the oxidation of 2-ME should proceed with a photocatalytic process by 1, because the turn over number (TON) for the formation of 2-HEDS was over unit. The TON was determined to be 642 as a maximum value when 1a was used as a sensitizer. The formation of 2-HDES was extremely slow under argon atmosphere. The fluorescence of 1 was not quenched by 2-ME at all, and the free energy change (${\Delta}G$) with electron transfer (ET) from 2-ME to excited triplet state of $1(^31^*)$ was estimated as a negative value. The quenching rate constant ($k_r$) of $^31^*$ by 2-ME, obtained by the kinetics for the formation of 2-HEDS, strongly depends on ${\Delta}G$. These findings indicate that 1-sensitized oxidation was initiated by photoinduced ET from 2-ME to $^31^*$ to generate both radical cation of 2-ME ($2-ME^{+\bulle}$) and porphyrin radical anion ($1^{-\bulle}$), resulting that the formation of 2-HEDS can be proceeded by the dimerization of $2-ME^{+\bulle}$, and through a catalytic cycle due to returning to 1 by the ET from $1^{-\bulle}$ to molecular oxygen.
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