Evaluierung einer Pestizid‐Multimethode für Kreuzkümmel mittels LC‐MS/MS mit QuEChERS und der Enhanced Matrix Removal – Lipid Aufreinigung (EMR‐Lipid)

2021 ◽  
Vol 75 (S2) ◽  
Author(s):  
I. Brand ◽  
J. Kroschwald ◽  
G. Witt
Keyword(s):  
Matrix Removal

Multiresidue determination of 19 anabolic steroids in animal oil using enhanced matrix removal lipid cleanup and ultra-performance liquid chromatography–tandem mass spectrometry

2021 ◽  
Author(s):  
jiafeng yu ◽  
Decheng Suo ◽  
Xiaoyong Lei ◽  
Yang Li ◽  
Guangyu Lin ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Anabolic Steroids ◽  
Ultra Performance Liquid Chromatography ◽  
Tandem Mass ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
Matrix Removal ◽  
Multiresidue Determination

A method for automated and sensitive analysis of 19 anabolic steroids (AS) in animal oil using enhanced matrix removal lipid (EMR-Lipid) cleanup and ultra-performance liquid chromatography–tandem mass spectrometry (UPLC–MS/MS) was...

Flexible Nanoporous Materials by Matrix Removal from Cylinder-Forming Diblock Copolymers

Nano Letters ◽  
2021 ◽  
Author(s):  
Hongyun Xu ◽  
Han Xiao ◽  
Christopher J. Ellison ◽  
Mahesh K. Mahanthappa
Keyword(s):  
Diblock Copolymers ◽  
Nanoporous Materials ◽  
Matrix Removal

Determination of multi-element concentrations at ultra-low levels in alternating magnetite and pyrite by HR-ICP-MS using matrix removal and preconcentration

2016 ◽  
Vol 127 ◽  
pp. 237-246 ◽  
Author(s):  
Wenjun Li ◽  
Changle Wang ◽  
Bingyu Gao ◽  
Yating Wang ◽  
Xindi Jin ◽  
...  
Keyword(s):  
Element Concentrations ◽  
Icp Ms ◽  
Matrix Removal ◽  
Low Levels

scholarly journals Separation of Arsenic and Selenium Species by Capillary Zone Electrophoresis in a Coated Capillary

1999 ◽  
Vol 82 (6) ◽  
pp. 1587-1593 ◽  
Author(s):  
Natalia G Vanifatova ◽  
Boris Y Spivakov ◽  
Juergen Mattusch ◽  
Rainer Wennrich
Keyword(s):  
Capillary Zone Electrophoresis ◽  
Sensitivity Enhancement ◽  
Selenium Species ◽  
Long Term Stability ◽  
Zone Electrophoresis ◽  
Electrophoresis Method ◽  
Capillary Zone ◽  
Matrix Removal

Abstract A capillary zone electrophoresis method was developed for the determination of 8 arsenic and selenium species in a polymer-coated capillary. Large-volume stacking with matrix removal was used for sensitivity enhancement. The entire analysis time was only a few minutes. The experimental sensitivity enhancement for 7 species was found to be near its theoretical value. Coating capillaries for long-term stability in alkaline buffer electrolytes was also investigated.

scholarly journals The Effect of Hydrofluoric Acid Concentration and Heat on the Bonding to Lithium Disilicate Glass Ceramic

2016 ◽  
Vol 27 (6) ◽  
pp. 727-733 ◽  
Author(s):  
Daniel Sundfeld ◽  
Lourenço Correr-Sobrinho ◽  
Núbia Inocêncya Pavesi Pini ◽  
Ana Rosa Costa ◽  
Renato Herman Sundfeld ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Ceramic ◽  
Hydrofluoric Acid ◽  
Lithium Disilicate ◽  
Resin Cement ◽  
Glassy Matrix ◽  
Etching Time ◽  
Sem Images ◽  
Matrix Removal ◽  
Post Hoc

Abstract The aim of this study was to evaluate the effects of hydrofluoric acid (HF) concentration and previous heat treatment (PHT) on the surface morphology and micro-shear bond strength (mSBS) of a lithium disilicate glass ceramic (EMX) to resin cement. One hundred four EMX specimens were randomly assigned to two groups (n=52) according to the HF concentration: 5% and 10%. A new random distribution was made according to the PHTs (n=13): control (no PHT); previously heated HF (70 °C); previously heated EMX surface (85 °C); the combination of heated HF + heated EMX surface. The etching time was set at 20 s. All EMX blocks were silanated and received a thin layer of an unfilled resin. Five resin cement cylinders were made on each EMX surface using Tygon tubes as matrices, and then stored for 24 h at 37 °C. One random etched EMX sample from each group was analyzed using field-emission scanning electron microscopy (FE-SEM). The data were subjected to two-way ANOVA and multiple comparisons were performed using the Tukey post hoc test (a=0.05). For the control groups, 5% HF showed statistically lower mSBS values when compared to 10% HF (p<0.05). PHT increased the mSBS values for 5% HF, yielding statistically similar results to non-PHT 10% HF (p<0.05). FE-SEM images showed increased glassy matrix removal when PHT was applied to HF 5%, but not to the same degree as for 10% HF. PHT has the potential to improve the bond strength of 5% HF concentration on lithium disilicate glass ceramic.

scholarly journals Continuous online determination of 226Ra in liquid effluents using automated column chromatography-ICP-MS

2015 ◽  
Vol 93 (11) ◽  
pp. 1226-1231 ◽  
Author(s):  
R. Douglas Evans ◽  
Andrei Izmer ◽  
Karima Benkhedda ◽  
Andrew Toms ◽  
Angelo Fernando ◽  
...  
Keyword(s):  
Flow Injection ◽  
Limit Of Detection ◽  
Sample Volume ◽  
Injection System ◽  
Automatic Integration ◽  
Icp Ms ◽  
On Line ◽  
Flow Injection System ◽  
Matrix Removal ◽  
Control Column

A measurement system capable of continuous on-line matrix removal, pre-concentration and analysis of 226Ra using pre-packed columns coupled to a flow injection system and an ICP-MS was developed. Full instrumental control of both the ICP-MS and the flow injection system provided automatic integration of the transient signals. The flow injection system was programmed to control column conditioning, sample loading, column rinsing, analyte elution and column cleaning operations employing appropriate solutions. The application of this system to the 226Ra analysis of an industrial liquid effluent was demonstrated. Using this particular instrument together with pre-concentration and matrix removal procedures, a limit of detection of 5.4 fg L−1 (2 mBq L−1) and a method detection limit of 16.2 fg L−1 (6 mBq L−1) were achieved for the measurement of 226Ra using a 25 mL sample volume. Total time for sample handling and analysis is approximately 10 minutes. The concentration of 226Ra in a discharged effluent sample was 0.73 pg L−1 (27 mBq L−1), which is in good agreement with the value of 0.81 pg L−1 (30 mBq L−1) measured using conventional alpha counting techniques.

Surgery for Cholesteatomatous Labyrinthine Fistula

2017 ◽  
Vol 126 (3) ◽  
pp. 205-215 ◽  
Author(s):  
John Lim ◽  
Anupriya Gangal ◽  
Michael Brian Gluth
Keyword(s):  
Hearing Preservation ◽  
Quality Level ◽  
Level Of Evidence ◽  
Labyrinthine Fistula ◽  
Published Evidence ◽  
Size Grade ◽  
Matrix Removal ◽  
The Individual ◽  
Hearing Outcomes

Objective: There is uncertainty regarding the ideal surgical management of cholesteatomatous labyrinthine fistulae. The objective was to review the published evidence to determine whether a difference exists in hearing outcome for cholesteatoma matrix removal or matrix exteriorization. Data Sources: Systematic MEDLINE and Web of Science searches identified publications describing hearing results after cholesteatoma matrix removal or matrix exteriorization. Review Methods: Three reviewers appraised the studies for quality, level of evidence, and extracted data. Fistula characteristics such as single-site, multisite, size, grade, and follow-up time were extracted for subanalyses, and when appropriate, data were pooled for statistical analysis. Results: Twenty-eight articles met inclusion criteria, and the level of evidence was judged no better than level 3b. There was no difference in hearing preservation detected between matrix removal and exteriorization (87% for matrix removal, 95% CI, 0.82-0.90; 95% for exteriorization, 95% CI, 0.85-0.98). An analysis of the individual cohort studies that compared these groups directly did not show a difference in calculated odds ratio (OR), 0.96 (95% CI, 0.66-1.40). Conclusion: The level of evidence on which to base surgical decision making related to cholesteatomatous labyrinthine fistula is poor, and the data do not demonstrate significant differences in hearing outcomes based on surgical technique.

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