Zinc(II) complexes of alpha-amino acids and their derivatives with a Zn(N2O2) coordination mode were found to have in vitro insulinomimetic activity as estimated the inhibition free fatty acid release isolated rat adipocytes treated epinephrine. It was revealed that activities zinc(II) over-all stability constants (log beta) less than 10.5 are higher those ZnSO4 VOSO4. The high blood glucose level KK-Ay mice type 2 diabetes mellitus lowered by daily intraperitoneal injections complex,...

Abstract Twelve new amino acid derivatives/Zn(II) complexes were prepared by the reactions of ZnSO4 and nine tetradentate ligands, Gly, Ala, Val, Leu, Ser His derivatives three pentadentate Asp derivatives. The X-ray structure analysis [Zn3(N-pyridylmethyl-His)3(H2O)2](ClO4)3·2H2O revealed formation a trinuclear complex, in which ligands two water molecules coordinate to Zn(II), but complex an aqueous solution is present as monomeric ion. Several Zn(II) found have vitro insulinomimetic...

Silver nanoclusters in poly(methyl methacrylate) (Ag/PMMA) were prepared by bulk polymerization of methyl methacrylate with radical initiators the presence silver(I) trifluoroacetate (AgTfa), followed a period heating. To compare influence type initiator on formation Ag nanoclusters, 2,2'-azobisisobutyronitrile (AIBN) and benzoyl peroxide (BPO) chosen as initiators. On basis characterization solid sols Ag/PMMA thus prepared, it was revealed visible spectroscopy TEM that size nanoparticles...

Abstract Silver nanoclusters in poly(methyl methacrylate) (Ag/PMMA) were prepared by bulk polymerization of MMA with radical initiators (AIBN or BPO) the presence silver(I) trifluoroacetate, followed a period UV irradiation. It was revealed that any Ag/PMMA samples both shows plasmon absorption peak at ca. 420 nm, whereas an additional 340 nm found exclusively for those BPO.

In vitro insulinomimetic activities of Zn(II) complexes with three natural products, betaine, L-lactic acid, and D-(−)-quinic acid (qui), were found in rat adipocytes treated epinephrine terms the inhibition free fatty release. Based on results, blood glucose lowering effect KK-Ay mice type 2 diabetes mellitus was observed by daily i.p. injections a monomeric zinc(II) complex, Zn(qui)2, for 13 d.

Abstract Three N,N′-ethylenebis(l-amino acid) ligands have been obtained simultaneously with three α,α′-(1,4-piperazinediyl)bis[(S)-alkanoic acid] and four N,N′-ethylenedipeptide products, by reacting a mixture of l-histidine methyl ester l-aspartic acid dimethyl glyoxal in the presence sodium cyanotrihydroborate methanol. Europium(III) complexes were useful as chiral NMR shift reagents for some unprotected natural α-amino acids substrates neutral aqueous solution, characterized large...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular species formed by the reaction of copper(I) trifluoroacetate with alkenes and benzene in solid liquid stateNaohisa Yanagihara, Jose Antonio Sampedro, Casillas V. Rodolfo, Quintus Fernando, Tetsuya OguraCite this: Inorg. Chem. 1982, 21, 2, 475–479Publication Date (Print):February 1, 1982Publication History Published online1 May 2002Published inissue 1 February...

In this work we have synthesized silver nanoparticles in Poly (methyl methacrylate) (PMMA). This was achieved by polymerizing the mixture of monomer and corresponding metal compound, followed post-heating treatment. The linear absorption coefficient samples measured using a spectrophotometer, where an peak at 420 nm observed. grows up shifts as function concentration radical initiator. refractive index Fresnel equations agrees with previous reported results. nonlinear properties were...

Abstract Three Zn(II) complexes with nicotinamide(na), nicotinemethylamide(nma), and nicotineethylamide(nea) were found to have in vitro insulinomimetic activities. X-ray structure analysis of [Zn(nea)2(H2O)2(SO4)]n showed that each nitrogen atom two nea molecules locates trans, the water oxygen sulfates coordinate a ion, forming an octahedral geometry Zn(N2O4) unit inorganic polymer crystal. The na, nma, exhibited higher activities, respective IC50 values (50% inhibition concentration...

Abstract Structurally constrained ethyl (2S)-3-(4-hydroxyphenyl)-2-{[(3S)-3-(imidazole-4-yl)-methyl]-2-oxo-piperazine-1-yl}propionate (N,N′-ethylene-bridged-(S)-histidyl-(S)-tyrosine ester, eHY-OEt) was obtained by a one-pot reaction from (S)-histidine methyl ester and (S)-tyrosine with glyoxal. Four ligands, (Boc-Gly-eHY-OEt (HL1), Boc-Gly-eHY-NH2 (HL2), Ac-eHY-OEt (HL3), Ac-eHY-NH2 (HL4), where Boc-Gly is t-butyloxycarbonyl-glycyl Ac acetyl) were derived eHY-OEt. Also, corresponding...

Abstract Thermal shrinkage of highly hot‐drawn and quenched poly(methyl methacrylate) polycarbonate bisphenol A were measured. PMMA shows three‐step thermal under suitable experimental conditions above its glass transition temperature ( T g ). Polycarbonate exhibits four kinds molecular relaxation associated with around . The effect hot‐drawing quenching on shrinking behavior is discussed. Almost all the relaxations are observed origins discussed in relation so‐called 11 transitions polymers.

L-3,4-dihydroxyphenylalanine (L-DOPA) is one of the important secondary metabolites plants and has been used for various purposes, such as in clinical treatment Parkinson's disease dopamine-responsive dystonia. In plants, L-DOPA a precursor many alkaloids, catecholamines, melanin; synthesis pathway similar to that mammals. acts an allelochemical, role several biological processes, stress response metabolism, plants. widely well dietary supplement or psychotropic drug, understanding...

A simple, easy, and environmentally benign new technology consisting of a two-step process is proposed for the chemical recycling fluoropolymers.

Abstract Lanthanum trifluoride (LaF3) has been obtained as the final product of thermal decomposition corresponding trifluoro-methanesulfonate [La(OTf)3]. The processes up to 600 °C were characterized by means TG, DTA, XRD and MS. It was revealed that over all reaction scheme for proceeds follow: La(OTf)3→ LaF3 + 3SO2 CO2 CF3OCF3.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver complex of poly(methylphenylsiloxane) as the active component for separation aliphatic, olefinic, and aromatic hydrocarbons by gas chromatographyAna Maria. Soto, Naohisa. Yanagihara, Tetsuya. OguraCite this: Anal. Chem. 1991, 63, 11, 1178Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June...

Abstract Characterization of Ag nanocluster in poly(methyl methacrylate), PMMA, and kinetic observation on the polymerization MMA presence silver(I) complex have been investigated. On basis these studies, it was revealed that growing polymer radical is responsible for reduction ion heat-treatment appears to play an important role agglomeration formation cluster.

Abstract Nylon-6 and nylon-6,6 were subjected to oxidative degradation with NO2 in supercritical CO2. It was found that valuable short-chain α,ω-diacid mixture could be obtained good yield under relatively mild conditions.