Monatshefte Fur Chemie最新文献_第10页

Thermal degradation assessment of canola and olive oil using ultra-fast gas chromatography coupled with chemometrics. 超快速气相色谱-化学计量学评价菜籽油和橄榄油的热降解。

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2017-01-01 Epub Date: 2017-07-01 DOI: 10.1007/s00706-017-1968-y

Tomasz Majchrzak, Martyna Lubinska, Anna Różańska, Tomasz Dymerski, Jacek Gębicki, Jacek Namieśnik

{"title":"Thermal degradation assessment of canola and olive oil using ultra-fast gas chromatography coupled with chemometrics.","authors":"Tomasz Majchrzak, Martyna Lubinska, Anna Różańska, Tomasz Dymerski, Jacek Gębicki, Jacek Namieśnik","doi":"10.1007/s00706-017-1968-y","DOIUrl":"https://doi.org/10.1007/s00706-017-1968-y","url":null,"abstract":"Abstract: Oil blending is often used to enhance the properties of vegetable oils. The admixture of a more thermally stable oil makes the resulting blend more suitable for use in frying. A new method of quality assessment of vegetable oils used in frying is presented in this paper. In this method, ultra-fast gas chromatography coupled with flame ionization detector and chemometrics is employed. Principal component analysis was used for data processing. The results obtained with this method were compared with the results of the Rancimat test and sensory evaluation. It is demonstrated that the addition of olive oil improves the stability of rapeseed oil, and also changes its flavour and aroma profile. In addition, it was found that ultra-fast GC coupled with chemometrics is an effective tool for the assessment of the quality of edible oils. The proposed method does not require sample preparation, and the total time of analysis is less than 2 min.Graphical abstract: ","PeriodicalId":18766,"journal":{"name":"Monatshefte Fur Chemie","volume":"148 9","pages":"1625-1630"},"PeriodicalIF":1.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00706-017-1968-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35283997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Formation of potentially toxic carbonyls during oxidation of triolein in the presence of alimentary antioxidants. 在食物抗氧化剂存在的情况下，三油酸氧化过程中形成潜在有毒的羰基。

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2017-01-01 Epub Date: 2017-10-19 DOI: 10.1007/s00706-017-2036-3

Marini Damanik, Michael Murkovic

{"title":"Formation of potentially toxic carbonyls during oxidation of triolein in the presence of alimentary antioxidants.","authors":"Marini Damanik, Michael Murkovic","doi":"10.1007/s00706-017-2036-3","DOIUrl":"10.1007/s00706-017-2036-3","url":null,"abstract":"Abstract: A relation between oil uptake and cancer as well as induction of hepatic inflammation was shown earlier. It is discussed that the main oil oxidation products-hydroperoxides and carbonyls-might be the reason for the mentioned diseases. In this manuscript quantitative determination of aldehydes which are formed during oxidation of triolein-as a model substance-using the Rancimat 679 is described. The oxidation of 11 g of triolein is carried out at 120 °C sparging air with a flow of 20 dm3/h for 10 h. A series of aliphatic aldehydes starting from hexanal to decanal as well as decenal was identified by LC-MS/MS and quantified as DNPH derivatives. In addition, the total amount of carbonyls was determined. Based on the calibration with hexanal, all other dominant substances were in the similar concentration range with maximum concentrations of 1.6 µmol/cm3 of hexanal, 2.3 µmol/cm3 of heptanal, 2.5 µmol/cm3 of octanal, 3.2 µmol/cm3 of nonanal, 4.0 µmol/cm3 of decanal after 6 h. The total amount of carbonyls reached a maximum after 6 h being 27 µmol/cm3 for triolein without antioxidant. The results of this investigation will be a basis for further toxicological studies on oxidized oils.Graphical abstract: ","PeriodicalId":18766,"journal":{"name":"Monatshefte Fur Chemie","volume":"148 12","pages":"2031-2035"},"PeriodicalIF":1.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00706-017-2036-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35296185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Increase in electron scattering length in PEDOT:PSS by a triflic acid post-processing. 三乙酸后处理后PEDOT:PSS中电子散射长度的增加。

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2017-01-01 Epub Date: 2017-03-31 DOI: 10.1007/s00706-017-1973-1

Dominik Farka, H Coskun, P Bauer, D Roth, B Bruckner, Petr Klapetek, N Serdar Sariciftci, P Stadler

{"title":"Increase in electron scattering length in PEDOT:PSS by a triflic acid post-processing.","authors":"Dominik Farka, H Coskun, P Bauer, D Roth, B Bruckner, Petr Klapetek, N Serdar Sariciftci, P Stadler","doi":"10.1007/s00706-017-1973-1","DOIUrl":"https://doi.org/10.1007/s00706-017-1973-1","url":null,"abstract":"Abstract: A stringent limitation in many optoelectronic devices, such as solar cells and light emitting diodes, is the intrinsic need for a transparent electrode. Uniting relevant aspects, indium tin oxide (ITO) is often the material of choice, however, alternatives are sought and being in particular found in conductive polymers. In this work, we present a novel doping strategy to arrive at highly conducting polymeric material based on poly-3,4-ethylenedioxythiophene (PEDOT). Based on commercial high conductivity PEDOT:PSS (Clevios PH 1000), and a post processing with aqueous triflic acid delivers a material that is both transparent and of low resistivity (5.23 × 10-4 Ω cm). Furthermore, this material retains its conductive character over a large temperature range, indicating metallic behaviour. This is further supported by positive magnetoconductance effects at low temperatures (1.8-10 K) and extended mean free paths of the conduction electrons are observed-evidencing for a metallic state in this polymer.Graphical abstract: ","PeriodicalId":18766,"journal":{"name":"Monatshefte Fur Chemie","volume":"148 5","pages":"871-877"},"PeriodicalIF":1.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00706-017-1973-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34954715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Electrochemical determination of closantel in the commercial formulation by square-wave adsorptive stripping voltammetry. 方波吸附溶出伏安法测定商业配方中氯桑特的电化学含量。

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2017-01-01 Epub Date: 2016-10-28 DOI: 10.1007/s00706-016-1862-z

Mariola Brycht, Agnieszka Nosal-Wiercińska, Karolina Sipa, Konrad Rudnicki, Sławomira Skrzypek

{"title":"Electrochemical determination of closantel in the commercial formulation by square-wave adsorptive stripping voltammetry.","authors":"Mariola Brycht, Agnieszka Nosal-Wiercińska, Karolina Sipa, Konrad Rudnicki, Sławomira Skrzypek","doi":"10.1007/s00706-016-1862-z","DOIUrl":"10.1007/s00706-016-1862-z","url":null,"abstract":"Abstract: In this paper, the square-wave adsorptive stripping voltammetric (SWAdSV) determination of the veterinary drug closantel using a renewable silver amalgam film electrode (Hg(Ag)FE) is presented. As observed in SWAdSV, closantel provided one well-shaped reduction peak suitable for analytical purposes at potential ca. -1.4 V in the Britton-Robinson (B-R) buffer at pH 7.0. At optimal conditions, the SWAdSV response of Hg(Ag)FE for determining closantel was linear over two concentration ranges of 5.0 × 10-8 to 2.0 × 10-7 mol dm-3 and 2.0 × 10-7 to 1.2 × 10-6 mol dm-3 with a detection limit of 1.1 × 10-8 mol dm-3. In addition, a relevance of the developed SWAdSV method was successfully verified by the quantitative analysis of closantel in the commercial formulation Closamectin Pour-On with satisfactory results (RSD = 5.8%, recovery = 101.8%). The results showed that the developed procedure can be adequate for screening purposes. Also, the electrochemical behavior of closantel was characterized by cyclic voltammetry, and it was found that closantel exhibited a quasi-reversible behavior with cathodic peak on the forward scan at ca. -1.4 V and anodic peak on the reverse scan at ca. -1.35 V vs. Ag/AgCl in B-R buffer, pH 7.0. As the obtained results showed that the electrode mechanism of closantel is controlled by the adsorption, the effect of adsorption was studied using the electrochemical impedance spectroscopy technique.Graphical abstract: ","PeriodicalId":18766,"journal":{"name":"Monatshefte Fur Chemie","volume":"148 3","pages":"463-472"},"PeriodicalIF":1.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00706-016-1862-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34856866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Progress on lead-free metal halide perovskites for photovoltaic applications: a review. 光伏无铅金属卤化物钙钛矿研究进展

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2017-01-01 Epub Date: 2017-03-08 DOI: 10.1007/s00706-017-1933-9

Sebastian F Hoefler, Gregor Trimmel, Thomas Rath

{"title":"Progress on lead-free metal halide perovskites for photovoltaic applications: a review.","authors":"Sebastian F Hoefler, Gregor Trimmel, Thomas Rath","doi":"10.1007/s00706-017-1933-9","DOIUrl":"10.1007/s00706-017-1933-9","url":null,"abstract":"Abstract: Metal halide perovskites have revolutionized the field of solution-processable photovoltaics. Within just a few years, the power conversion efficiencies of perovskite-based solar cells have been improved significantly to over 20%, which makes them now already comparably efficient to silicon-based photovoltaics. This breakthrough in solution-based photovoltaics, however, has the drawback that these high efficiencies can only be obtained with lead-based perovskites and this will arguably be a substantial hurdle for various applications of perovskite-based photovoltaics and their acceptance in society, even though the amounts of lead in the solar cells are low. This fact opened up a new research field on lead-free metal halide perovskites, which is currently remarkably vivid. We took this as incentive to review this emerging research field and discuss possible alternative elements to replace lead in metal halide perovskites and the properties of the corresponding perovskite materials based on recent theoretical and experimental studies. Up to now, tin-based perovskites turned out to be most promising in terms of power conversion efficiency; however, also the toxicity of these tin-based perovskites is argued. In the focus of the research community are other elements as well including germanium, copper, antimony, or bismuth, and the corresponding perovskite compounds are already showing promising properties.Graphical abstract: ","PeriodicalId":18766,"journal":{"name":"Monatshefte Fur Chemie","volume":"148 5","pages":"795-826"},"PeriodicalIF":1.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00706-017-1933-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34955283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 360

Aerosol-assisted CVD of thioether-functionalised indium aminoalkoxides. 硫醚功能化铟氨基醇氧化物的气溶胶辅助气相沉积。

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2017-01-01 Epub Date: 2017-06-02 DOI: 10.1007/s00706-017-1980-2

Felix Biegger, Felix Jungwirth, Michael Stanislaus Seifner, Christoph Rameshan, Sven Barth

引用次数: 4

Crosslinking of floating colloidal monolayers. 漂浮胶体单层的交联。

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2017-01-01 Epub Date: 2017-06-20 DOI: 10.1007/s00706-017-1997-6

Steffen Kurzhals, Michael Süss, Jelena Pejovic, Peter D J van Oostrum, Erik Reimhult, Ronald Zirbs

引用次数: 1

First chemo-enzymatic synthesis of the (R)-Taniguchi lactone and substrate profiles of CAMO and OTEMO, two new Baeyer–Villiger monooxygenases 首次化学酶合成(R)-谷口内酯和CAMO和OTEMO的底物谱，两种新的Baeyer-Villiger单加氧酶

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2016-12-21 DOI: 10.1007/s00706-016-1873-9

Florian Rudroff, Michael J. Fink, Ramana Pydi, U. Bornscheuer, M. Mihovilovic

引用次数: 10

Efficient preparation of 2-nitroimidazole nucleosides as precursors for hypoxia PET tracers 2-硝基咪唑核苷作为缺氧PET示踪剂前体的高效制备

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2016-12-07 DOI: 10.1007/s00706-016-1874-8

P. Křížková, A. Wieczorek, F. Hammerschmidt

引用次数: 1

Recent advancements on the use of 2-methyltetrahydrofuran in organometallic chemistry 2-甲基四氢呋喃在有机金属化学中的应用进展

IF 1.8 4区化学

Monatshefte Fur Chemie Pub Date : 2016-12-07 DOI: 10.1007/s00706-016-1879-3

Serena Monticelli, L. Castoldi, I. Murgia, Raffaele Senatore, Eugenia Mazzeo, Judith Wackerlig, E. Urban, T. Langer, Vittorio Pace

引用次数: 61