共查询到20条相似文献,搜索用时 37 毫秒
1.
Kurt Kalcher Ivan Svancara Marijo Buzuk Karel Vytras Alain Walcarius 《Monatshefte für Chemie / Chemical Monthly》2009,140(8):861-889
Abstract An overview of the use of electrochemical sensors made from heterogeneous carbon materials (carbon paste electrodes, screen-printed
carbon electrodes) in the field of food analysis is presented. Sensors for inorganic and organic analytes as well as biosensors
are summarized.
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2.
Michael Petz 《Monatshefte für Chemie / Chemical Monthly》2009,140(8):953-964
Abstract Optical biosensors based on surface plasmon resonance are increasingly used to detect and (semi)quantify residues and contaminants
in food. This review provides an overview of the methods published in this field since the year 2003. Such biosensors have
mostly been applied to veterinary drug residues, like aminoglycosides, beta-agonists, cephalexin, chloramphenicol, fluoroquinolones,
levamisole, nicarbazin, nitroimidazoles, penicillins, ractopamine, sulfonamides, tetracyclines, and tylosin in milk, egg,
honey, prawn, muscle, liver and kidney. Only a few methods have been published on pesticide residues, mycotoxins, phycotoxins,
polychlorinated biphenyls and surfactants. These procedures are described with regard to biological recognition element, type
of sensor chip, immobilisation procedure, sample extraction and clean-up, crossreactivity, nonspecific binding, matrix interference,
chip regeneration, assay formats, calibration, validation and instrumentation.
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3.
Subramanian Viswanathan Hanna Radecka Jerzy Radecki 《Monatshefte für Chemie / Chemical Monthly》2009,140(8):891-899
Abstract Food analysis has become a very important and interesting area of research because of the rapid expansion of food trade and
highly increased mobility of today’s populations. Food quality control is essential both for consumer protection and also
for the food industry. Application of the electrochemical biosensors in the field of food analysis is promising. This review
covers the recent developments and issues in electrochemical biosensors for food analysis, such as ease of preparation, robustness,
sensitivity, and realization of mass production of the detection strategies. This review also emphasizes the current development
of electrochemical biosensors combined with nanotechnology.
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4.
Miki Hasegawa Shunsuke Kunisaki Hideki Ohtsu Franz Werner 《Monatshefte für Chemie / Chemical Monthly》2009,140(7):751-763
Abstract On ultra-thin films, Tb(III) shows polarized ff-emission in the visible wavelength region induced by intramolecular energy
transfer from the photoexcited organic ligand, such as phenanthroline. Pr(III) causes polarized ππ* emission from the chromophore
in the ultra-thin film (Langmuir–Blodgett film). Here, the unique optical properties of molecular devices with lanthanide
complexes are summarized.
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5.
Dmitry A. Sibgatulin Dmitry M. Volochnyuk Aleksander N. Kostyuk Sergey P. Ivonin Andriy V. Lapandin 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):639-643
Abstract The reaction of push–pull enamines with 1,2-biselectrophilic phenylglyoxal was investigated. Phenylglyoxal was found to react
depending on the structure of the push–pull enamine, affording either a hydroxyalkylation product at the methyl group or the
cyclic product via participation of the methyl group and the β-carbon of the enamine.
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6.
Madhukar N. Jachak Sandeep M. Bagul Bhausaheb K. Ghotekar Raghunath B. Toche 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):655-662
Abstract A series of (2E)-3-(1-chloro-6-methoxy-3,4-dihydronaphthalen-2-yl)-1-(4-aryl)prop-2-en-1-ones (chalcones) have been synthesized by a new
synthetic route. The 3-pyridinecarbonitrile derivatives were synthesized by the Michael reaction of malononitrile (in base)
and aroylacetonitriles (in acid) with chalcones in one pot. The fluorescent properties and quantum yields of these compounds
were studied.
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7.
Amin Rostami Sadegh Rahmati Ardeshir Khazaei 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):663-667
Abstract Molecular iodine generated in situ from Fe(NO3)3·9H2O/NaI acts as a highly efficient catalyst for tetrahydropyranylation of various alcohols and phenols with 3,4-dihydro-2H-pyran in almost quantitative yields. The reaction occurs rapidly in dichloromethane at room temperature, and use of toxic
molecular iodine is avoided.
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8.
S. Makarem A. R. Fakhari Ali A. Mohammadi 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):645-649
Abstract Electrochemical oxidation of 2,3-dimethylhydroquinone has been studied in the presence of β-diketones as nucleophiles in aqueous
solution using cyclic voltammetry and controlled-potential coulometry. The results indicate that the derivatives of 2,3-dimethylhydroquinone
participate in a Michael addition reaction to form the corresponding benzofuran derivatives. The electrochemical synthesis
has been successfully performed at pH 7.0 and E = 0.1 V versus an Ag|AgCl|KCl (3 M) in an undivided cell in good yield and purity.
Graphical Abstract
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9.
Issa Yavari Rahimeh Hajinasiri S. Zahra Sayyed-Alangi 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):205-207
Abstract 1-Ethyl-3-methylimidazolium bromide was used as a green recyclable alternative to volatile organic solvents for KOH catalyzed
three-component synthesis of diethyl alkylsulfanylmethylmalonates from aldehydes, diethyl malonate, and alkylthiols.
Graphical Abstract A synthesis of diethyl alkylsulfanylmethylmalonates catalyzed by KOH in an ionic liquid
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10.
Adel A.-H. Abdel-Rahman Ahmed E.-S. Abdel-Megied Hamed M. Abdel-Bary Abdel-Aleem H. Abdel-Aleem Emad M. I. Morcy Mohamed T. Shabaan 《Monatshefte für Chemie / Chemical Monthly》2009,140(5):559-564
Abstract A series of peptide derivatives conjugated with N1-protected tryptophan residue was synthesized. The prepared compounds were tested for antimicrobial activity against four
different bacterial species displaying different degrees of antibacterial activities or inhibitory actions.
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11.
Nagnnath D. Kokare Devanand B. Shinde 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):185-188
Abstract Aromatic aldoximes were converted to the corresponding nitriles in good to excellent yields by employing phosphoric acid diethyl
ester 2-phenylbenzimidazol-1-yl ester as reagent. The method was equally effective for oximes bearing electron-donating and
electron-withdrawing substituents.
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12.
Marco Rupprich Clemens Decristoforo Barbara Matuszczak 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):405-407
Abstract In contrast to the results presented in a previous report, the direct conversion of alcohols to alkyl fluorides with triphenylphosphine
and potassium fluoride in CCl4/DMF under mild conditions failed.
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13.
An atomistic simulation study of oxygen-vacancy migration in perovskite electrolytes based on LaGaO3
Abstract Static lattice simulation techniques were used to calculate the energetic barriers for oxygen-vacancy migration in the perovskite-type
oxide LaGaO3 substituted with alkaline earth cations. The calculated migration energies are found to vary with the number and size of
the substituting cations in the immediate neigbourhood of the migrating defect. It is argued that not only the size but also
the charge of the cations constituting the saddle-point configuration play a role in determining the migration energy.
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14.
Sara Tombelli Marco Mascini Barbara Scherm Gianni Battacone Quirico Migheli 《Monatshefte für Chemie / Chemical Monthly》2009,140(8):901-907
Abstract In this work, we report on the development of a DNA-based piezoelectric biosensor specific for the detection of an amplicon
of the aflD gene of Aspergillus flavus and A. parasiticus. Expression of this gene is consistently correlated with a strain’s ability to produce aflatoxins that are considered very
potent liver carcinogens in various animal species and humans. The DNA biosensor has been characterized with synthetic oligonucleotides
and amplicons. Moreover, it has been applied to the analysis of real samples consisting of amplicons of DNA extracted from
flours and feed contaminated with A. flavus and A. parasiticus.
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15.
Ch. Sree Lakshmi H. Rehaman Adari Bhaskar Rao 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):611-613
Abstract The enzymatic cyclization of phenoxyacetylcyanomethylenetriphenylphosphorane derivatives using pre-treated baker’s yeast cells,
a rapid one-pot assembly of heteromacrocyclic compounds, is described.
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16.
Enrique Ruiz-Trejo José-Francisco Gómez-García 《Monatshefte für Chemie / Chemical Monthly》2009,140(9):1031-1039
Abstract In the search of new materials for solid oxide fuel cells, a study of the structure and electrical conductivity of Mg-doped
and nominally pure CeNb3O9-δ was undertaken. This material exhibits an orthorhombic crystal structure as determined by Rietveld refinement. Through a
combined study of 4-point DC and AC impedance spectroscopy, it was determined that the material presents oxygen ion conductivity,
electron conductivity and electron-hole conductivity according to the partial pressure of oxygen and temperature in agreement
with a simple defect chemistry model. Finally, some experiments seem to indicate the presence of proton conduction.
Graphical Abstract
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17.
Jian-Feng Zhou Gui-Xia Gong Kun-Bo Shi Yu-Lan Zhu 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):651-654
Abstract A facile procedure for the synthesis of quinoxalines is being reported starting from 3-(2-bromoacetyl)coumarins or 3-(2-bromobutanoyl)coumarins
and substituted o-phenylenediamines. The reactions were carried out under catalyst-free and microwave irradiation conditions producing the
title compounds in moderate to excellent yields in a short time with easy workup. The structures of all new compounds have
been confirmed on the basis of their IR, 1H NMR, 13C NMR, and HRMS data.
Graphical Abstract
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18.
Do-Min Lee Gullapalli Kumaraswamy Kee-In Lee 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):73-78
Abstract Catalytic transfer hydrogenation of α-tosyloxyarylketones mediated by a chiral rhodium complex using an azeotropic mixture
of formic acid/triethylamine afforded the corresponding 1-arylethanediol monotosylates in excellent yield with high enantioselectivity.
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19.
Abstract One-pot, three-components synthesis of 2,4,6-triarylpyridines and 5-unsubstituted-3,4-dihydropyrimidin-2(1H)-ones was performed under solvent-free conditions using molecular iodine as the catalyst in moderate to good product yields.
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20.
Abstract A polymer-supported Lewis acid catalyst was prepared and found to be extremely efficient for the preparation of imidazole
derivatives via three-component condensation of benzil, aldehydes, and ammonium acetate under mild conditions. The catalyst
is stable and can be easily recovered and reused at least four times without any loss of activity.
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