Organic Dots Embedded in Mesostructured Silica Xerogel as High-Performance ECL Emitters: Preparation and Application for MicroRNA-126 Detection

2019 ◽  
Vol 12 (3) ◽  
pp. 3945-3952 ◽  
Author(s):  
Ting-Ting Tu ◽  
Yan-Mei Lei ◽  
Ya-Qin Chai ◽  
Ying Zhuo ◽  
Ruo Yuan
Keyword(s):  
High Performance ◽  
Silica Xerogel ◽  
Mesostructured Silica

Dispersions of Transition-Metal-Based Phases in Mesostructured Silica Matrixes: Preparation of High-Performance Catalytic Materials

ChemInform ◽  
2005 ◽  
Vol 36 (33) ◽  
Author(s):  
Miron V. Landau ◽  
Leonid Vradman ◽  
Adi Wolfson ◽  
P. Madhusudhan Rao ◽  
Mordehay Herskowitz
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Mesostructured Silica ◽  
Catalytic Materials

scholarly journals Mesostructured Silica-Coated Magnetic Nanoparticles to Extract Six Opium Alkaloids in Poppy Seeds Prior to Ultra-High-Performance Liquid Chromatography-Tandem Mass Spectrometry Analysis

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1587
Author(s):  
Gema Casado-Hidalgo ◽  
Damián Pérez-Quintanilla ◽  
Sonia Morante-Zarcero ◽  
Isabel Sierra
Keyword(s):  
High Performance ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Mass Spectrometry Analysis ◽  
Reference Level ◽  
Human Consumption ◽  
Spectrometry Analysis ◽  
Mesostructured Silica ◽  
Opium Alkaloids ◽  
Poppy Seeds

In recent years, health authorities have become increasingly concerned about preventing consumer exposure to opium alkaloids present in Papaver somniferum L. poppy seeds. In this study, a simple, rapid and efficient method has been optimised to determine all main opioids in poppy seeds (morphine, codeine, thebaine, papaverine, noscapine and oripavine) by UHPLC-QqQ-MS/MS. For this purpose, solid-liquid extraction (SLE) of samples was optimised and six magnetic adsorbent materials with a core of Fe3O4 coated with amorphous and mesostructured silica, both functionalised with octadecyl-silane or octyl-silane were characterised and evaluated for magnetic solid-phase extraction (MSPE). The material with the best results was non-functionalised mesostructured silica and, with it, the MSPE procedure was optimised. This method was validated and used to quantify six opioids in 14 edible seed samples (eleven poppy seeds and three seed mixes). Considerable amounts were found (1.5–249.0 mg/kg morphine, <0.2 µg/kg–45.8 mg/kg codeine, <2.4 µg/kg–136.2 mg/kg thebaine, <0.2 µg/kg–27.1 mg/kg papaverine, <0.2 µg/kg–108.7 mg/kg noscapine and <240 µg/kg–33.4 mg/kg oripavine), exceeding maximum limits established in some EU countries and the reference level of morphine in the EU. Furthermore, in some commercial samples for human consumption, inadequate labelling was found because significant amounts of alkaloids were detected even though Papaver rhoeas L. seeds were declared on the product label.

Dispersions of transition-metal-based phases in mesostructured silica matrixes: preparation of high-performance catalytic materials

2005 ◽  
Vol 8 (3-4) ◽  
pp. 679-691 ◽  
Author(s):  
Miron V. Landau ◽  
Leonid Vradman ◽  
Adi Wolfson ◽  
P. Madhusudhan Rao ◽  
Mordehay Herskowitz
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Mesostructured Silica ◽  
Catalytic Materials

scholarly journals Simultaneous Determination of Furanic Compounds and Acrylamide in Insect-Based Foods by HPLC-QqQ-MS/MS Employing a Functionalized Mesostructured Silica as Sorbent in Solid-Phase Extraction

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1557
Author(s):  
Lorena González-Gómez ◽  
Sonia Morante-Zarcero ◽  
Damián Pérez-Quintanilla ◽  
Isabel Sierra
Keyword(s):  
Solid Phase Extraction ◽  
High Performance ◽  
Solid Phase ◽  
Dietary Exposure ◽  
Good Alternative ◽  
Careful Study ◽  
Phase Extraction ◽  
Novel Foods ◽  
Mesostructured Silica ◽  
Cereal Bars

Insect-based products are novel foods (NF) that merit careful study. For this reason, in this work a method has been developed for the simultaneous analysis of four food processing contaminants (FPC), acrylamide (AA), 5-hydroxymethylfurfural, (HMF), 5-methylfurfural (MF) and furfural (F), in insect-based products (bars, crackers and flours) by high-performance liquid chromatography coupled to triple quadrupole mass spectrometry (HPLC-QqQ-MS/MS). The method consisted of a solid-liquid extraction (SLE) with acidified water, followed by solid-phase extraction (SPE), using 100 mg of a sorbent based on mesostructured silica with a large pore functionalized with amino groups (SBA-15-LP-NH2). The analytical method was properly optimized and validated in a representative bar sample of pineapple & coconut with cricket flour (Ins-B-Pine-Coco) showing good accuracy, with recoveries ranging from 70–101% for the four analytes and adequate precision (RSD < 9%). Good linearity (R2 ≥ 0.995) and low method quantification limits for AA (between 1.3–1.4 µg/g), F (between 7.9–8.8 µg/g), MF (between 3.1–6.5 µg/g) and HMF (between 1.5–3.3 µg/g) were also obtained in all samples studied. The proposed method was successfully applied in eleven insect-based foods. Results revealed that insect-based bars can be a good alternative to traditional cereal bars to reduce dietary exposure to HMF; but, in order to reduce the exposure to AA, alternative formulations must be evaluated in the design of innovative insect-based crackers.

High‐performance thermal insulator based on polymer foam and silica xerogel

2021 ◽  
Author(s):  
Xiao Yuan Chen ◽  
Shinsuke Nagamine ◽  
Masahiro Ohshima ◽  
Denis Rodrigue
Keyword(s):  
High Performance ◽  
Silica Xerogel ◽  
Polymer Foam ◽  
Thermal Insulator

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

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