巻号一覧
22 巻 (1997)
- 6 号 p. 292-
- 5 号 p. 224-
- 4 号 p. 172-
- 3 号 p. 120-
- 2 号 p. 74-
- 1 号 p. 2-
22 巻, 3 号
選択された号の論文の7件中1～7を表示しています
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八島 栄次, 岡本 佳男1997 年 22 巻 3 号 p. 120-125
発行日: 1997/05/01
公開日: 2011/03/04
ジャーナル フリーPhenylcarbamate derivatives, particularly, tris (3, 5-dimethylphenylcarbamate) s of cellulose (CD-MPC) and amylose (ADMPC) are very effective chiral stationary phases (CSPs) for high-performance liquid chromatography (HPLC) and can resolve many racemates including drugs. These polysaccharide derivatives have a merit that affords a film (membrane), which can preferentially adsorb one of the enantiomers. The CDMPC membrane can be used as a solid-membrane for the enantioselective permeation of racemic oxprenolol. Moreover, CDMPC can be utilized as a chiral moving belt for the continuous and preparative enantioseparation of oxprenolol.抄録全体を表示PDF形式でダウンロード (1022K) -
青木 俊樹, 金子 隆司, 及川 栄蔵1997 年 22 巻 3 号 p. 126-134
発行日: 1997/05/01
公開日: 2011/03/04
ジャーナル フリーSeveral new polymers for optical resolution membranes were synthesized and enantioselective permeabilities of the polymer membranes were examined for various racemates using four methods, that is, concentration-driven permeatiom (CP), pressure-driven permeation (Δ P), pervaporation (PV), and evapomeation (EV). (+) -Poly (1- (dimethyl (10-pinanyl) silyl) -1-propyne) ((+) -poly (DPSP)) membranes showed high enantioselective permeabilities in CP for various racemates and low permeation rates, which were improved by using PV or EV. (-) -Poly (2- (dimethyl (10-pinanyl) silyl) norbornadiene) had a higher permeability than (+) -poly (DPSP). High and stable enantioselective permeations were observed through the graft copolymers with (-) -oligo (methyl (10-pinanyl) siloxane) as the grafts. Polymers having a chiral main chain showed enentioselective permeability抄録全体を表示PDF形式でダウンロード (1135K) -
大井 尚文1997 年 22 巻 3 号 p. 135-144
発行日: 1997/05/01
公開日: 2011/03/04
ジャーナル フリーSeparation methods by chromatography and by use of membranes are useful for the enantiomer preparation respectively. The chiral discrimination in both methods is based on the diastereomeric association between the chiral selector and enantiomers in the separation process. Accordingly chiral selectors used as stationary phases for the chromatography are usually available for the separation by use of the membrane. For example, the membranes containing chiral crown ethers, β-cyclodextrin, poly (amino acid) etc. have good capability of separating enantiomers.
Generally chromatographic method is prefer the separation in a small amount of enantiomer, and membrane systems have potential as a tool for large, continuous, preparative scale enantiomer separation.抄録全体を表示PDF形式でダウンロード (1126K) -
青木 隆史1997 年 22 巻 3 号 p. 145-148
発行日: 1997/05/01
公開日: 2011/03/04
ジャーナル フリーThis paper describes that the optically active moieties, ((S) -sec-butylacrylamide (BAAm)), in N-isopropylacrylamide (IPAAm) copolymer chains affected the phase transition behavior and resulted in lower critical solution temperature (LCST) changes responding to foreign tryptophan (Trp). Copolymerization of (S) -sec-BAAm and IPAAm were carried out in DMF at 70°C for 25 h using AIBN. The copolymer was water-soluble and showed the characteristic LCST near 27°C. LCSTs of PIPAAm chains are affected by hydrophobic or hydrophilic nature of comonomers. Since sec-BAAm is insoluble in water, the component exhibited hydrophobic property. Therefore, poly ((S) -sec-BAAm-co-IPAAm) showed lower LCST as compared with that of PIPAAm. The LCSTs of the copolymer in the presence of L-Trp weve higher than those in the absence of the amino acid. It was understood that the optically active moieties in the copolymer stereospecifically interact with L-Trp, relatively enhancing hydrophilic property of the polymer chains. The copolymer increased the LCSTs in response to increasing L-Trp concentration. Hydrogels consisting of these comonomers will exhibit reversible swelling/ deswelling behavior in response to L-amino acids such as L-Trp. The polymers with the optically active moieties demonstrate the chiral discrimination to L-amino acids and are also good candidates to perform chiral separation.抄録全体を表示PDF形式でダウンロード (646K) -
Jun-ichiro Izumi, Masakazu Yoshikawa, Toshio Kitao1997 年 22 巻 3 号 p. 149-154
発行日: 1997/05/01
公開日: 2011/03/04
ジャーナル フリーMolecularly imprinted polymeric membranes were prepared from cellulose acetate (CA), which acetyl content was 40%, by applying the alternative molecular imprinting technique. The Boc-L-Glu imprinted polymeric membranes thus obtained recognized L-Glu in preference to D-Glu from racemic Glu mixtures. Enantioselective electrodialysis was attained with the present membranes, and L-Glu was preferentially permeated, reflecting their adsorption selectivity. The present study suggests that the molecularly imprinted CA membranes are applicable to the optical resolution of racemic amino acids.抄録全体を表示PDF形式でダウンロード (726K) -
牛越 健一, 長尾 衛, 松本 幹治1997 年 22 巻 3 号 p. 155-164
発行日: 1997/05/01
公開日: 2011/03/04
ジャーナル フリーThe following results were obtained in the experiments to improve the treated water quality at a combination system with two reverse osmosis systems, called “Double-pass Reverse Osmosis System”. (1) The installation of degasifier to reduce CO2 gas in raw water, gave a remarkable improvement of product water. (2) H2SO4 and Ca(OH)2 were used as the alternates of HCl and NaOH, respectively, to reduce pH value for preventing scaling and to convert CO2 to HCO3 or CO3 ion. (3) The electrolized cathode water was used instead of injecting alkali reagent such as NaOH for CO2 convertion, and resulted in the reduction of ion increace, which was expected to improve product water quality.抄録全体を表示PDF形式でダウンロード (1145K) -
栗原 優, 房岡 良成, 南口 尚士, 斗内 利夫1997 年 22 巻 3 号 p. 165-168
発行日: 1997/05/01
公開日: 2011/03/04
ジャーナル フリーA new crosslinked fully aromatic polyamide ultra low pressure composite reverse osmosis (RO) membrane (UTC-70UL) which can be used at around 0.75MPa, has been developed. UTC-70UL has approximately two times higher water flux than low pressure RO membrane (UTC-70) keeping the high solute rejection of UTC-70. SUL-G series element is spiral-wound element for brackish water desalination using UTC-70UL membrane, which has high productivity and high solute rejection same as the conventional element (SU-700 series spiral-wound element using UTC-70 membrane) at ultra low pressure 0.75MPa. SUL-GP series element is spiral-wound element especially designed for ultrapure water production, which has high productivity and high solute rejection and start-up characteristic better than that of conventional element (SU-700P series spiral-wound element) at ultra low pressure 0.75MPa.抄録全体を表示PDF形式でダウンロード (390K)
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