Recent Developments in Solid-Phase Extraction for Near and Attenuated Total Reflection Infrared Spectroscopic Analysis

Huck, Christian W.

doi:10.3390/molecules21050633

Cited by 14 publications

(9 citation statements)

References 100 publications

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“…15 Another, more conclusive hypothesis is, however, that the amount of water sorption is related to the PMMA's porosity. 17,18 Since monitoring the process of water absorption and desorption might derive new strategies for maximizing the denture base resin stability, it has been the aim of this study to investigate the water absorption/desorption and homogeneity using near-infrared (NIR) 19 and mid-infrared (MIR) spectroscopy, attenuated total reflection (ATR) 20,21 and imaging 22 spectroscopy, respectively. Infrared (IR) spectroscopy provides a noninvasive, yet fast analysis of given properties.…”

Section: Introductionmentioning

confidence: 99%

“…[41][42][43] In ATR-IR spectroscopy, the polymeric sample is pressed onto an internal reflection element (IRE) so that the evanescent field penetrates at least a few micrometers into the polymer of interest showing high signal-to-noise (S/N) ratio. 20 Infrared imaging spectroscopy takes advantage of the principle of a hyperspectral cube containing a threedimensional (3D) spectral and spatial data set with a spatial resolution down to approximately 2 mm in combination with ATR (ATR imaging). 44 Additionally, this technique does not require the application onto the sample for measurement.…”

Section: Introductionmentioning

confidence: 99%

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Novel Molecular Spectroscopic Multimethod Approach for Monitoring Water Absorption/Desorption Kinetics of CAD/CAM Poly(Methyl Methacrylate) Prosthodontics

Wiedemair¹,

Mayr²,

Wimmer³

et al. 2016

Appl Spectrosc

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Water absorbed to poly(methyl methacrylate) (PMMA)-based CAD/CAM (computer-assisted design/computer-assisted manufacturing) prosthodontics can alter their properties including hardness and stability. In the present contribution, water absorption and desorption kinetics under defined experimental conditions were monitored employing several supplementary and advanced Fourier transform infrared (FT-IR) spectroscopic techniques in combination with multivariate analysis (MVA). In this synergistic vibrational spectroscopic multimethod approach, first a novel near-infrared (NIR) diffuse fiber optic probe reflection spectroscopic method was established for time-resolved analysis of water uptake within seven days under controlled conditions. Near-infrared water absorbance spectra in a wavenumber range between 5288-5100 cm (combination band) and 5424-5352 cm (second overtone) were used establishing corresponding calibration and validation models to quantify the amount of water in the milligram range. Therefore, 14 well-defined samples exposed to prior optimized experimental conditions were taken into consideration. The average daily water uptake conducting reference analysis was calculated as 22 mg/day for one week. Additionally, in this study for the first time NIR two-dimensional correlation spectroscopy (2D-COS) was conducted to monitor and interpret the spectral dynamics of water absorption on the prosthodontics in a wavenumber range of 5100-5300 cm. For sensitive time-resolved recording of water desorption, a recently developed high-temperature, high-pressure FT-IR reaction cell with water-free ultra-dry in situ and operando operation was applied. The reaction cell, as well as the sample holder, was fully made of quartz glass, with no hot metal or ceramic parts in the vicinity of the high temperature zone. Applying a temperature gradient in the range of 25-150 ℃, mid-infrared (MIR) 2D-COS was successfully conducted to get insights into the dynamic behavior of O-H (1400-1800 cm) absorption bands with increasing temperature over time and the release of CO (2450 cm) from the polymers. In addition, an ATR FT-IR imaging setup was optimized in order to investigate the surface homogeneity of the PMMA-based resins with a spatial resolution to 2 µm. From this vibrational spectroscopic multimethod approach and the collection of several analytical data, conclusions were drawn as to which degree the surface structure and/or its porosity have an impact onto the amount of water absorption.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Molecular Spectroscopic Multimethod Approach for Monitoring Water Absorption/Desorption Kinetics of CAD/CAM Poly(Methyl Methacrylate) Prosthodontics

Wiedemair¹,

Mayr²,

Wimmer³

et al. 2016

Appl Spectrosc

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show abstract

“…What is equally important, NIR spectroscopy – and in wider context, vibrational spectroscopy – still requires to be used in hyphenation with other tools of analytical chemistry. 22 The powerful methods such as chromatography (gas, liquid, also coupled to the ultra-sensitive detectors), mass spectrometry and their combined usage provide the reference analyses without which spectroscopic methods would not be successful. However, the mentioned methods often remain prohibitively expensive and unfeasible for many of potential uses.…”

Section: The Synergy Of Nir Spectroscopy With Other Methods In Accompmentioning

confidence: 99%

The essential role of omni-capable research laboratories in advancing analytical spectroscopy

2019

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Contemporary analytical methods meet variety of demands originating from a magnitude of directions. This article reviews the current challenges and development trends unfolding at the frontier of analytical chemistry. A magnitude of research articles, conference meetings, and disseminations at scientific symposia take place nowadays. These figures rapidly increase on a year-to-year basis and the analytical strategies become increasingly diverse. Consequently, further advance depends on progressive improvements in the exchange of knowledge and boundary-crossing research. This fact highlights the fundamental role of multidisciplinary research laboratories in pushing the horizon in capabilities of novel methods of analysis. The advances in developing advanced analytical strategies at that accommodate a number of approaches and the resulting integrated analytical strategies are overviewed here.

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“…The extraction materials frequently used in SPE columns are the chemically bonded silica and the porous polystyrene . However, both of these two types of materials have distinct shortcomings, for instance, alkaline instability of silica, demand for an activating solvent, and incompletely extraction for some compounds . Therefore, it is essential to explore a novel extraction substrate.…”

Section: Introductionmentioning

confidence: 99%

β‐Cyclodextrin‐modified three‐dimensional graphene oxide‐wrapped melamine foam for the solid‐phase extraction of flavonoids

Hou

Niu

et al. 2018

J of Separation Science

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A new three-dimensional graphene oxide-wrapped melamine foam was prepared and used as a solid-phase extraction substrate. β-Cyclodextrin was fabricated onto the surface of three-dimensional graphene oxide-wrapped melamine foam by a chemical covalent interaction. In view of a specific surface area and a large delocalized π electron system of graphene oxide, in combination with a hydrophobic interior cavity and a hydrophilic peripheral face of β-cyclodextrin, the prepared extraction material was proposed for the determination of flavonoids. In order to demonstrate the extraction properties of the as-prepared material, the adsorption energies were theoretically calculated based on periodic density functional theory. Static-state and dynamic-state binding experiments were also investigated, which revealed the monolayer coverage of flavonoids onto the β-cyclodextrin/graphene oxide-wrapped melamine foams through the chemical adsorption. H NMR spectroscopy indicated the formation of flavonoids-β-cyclodextrin inclusion complexes. Under the optimum conditions, the proposed method exhibited acceptable linear ranges (2-200 μg/L for rutin and quercetin-3-O-rhamnoside; 5-200 μg/L for quercetin) with correlation coefficients ranging from 0.9979 to 0.9994. The batch-to-batch reproducibility (n = 5) was 3.5-6.8%. Finally, the as-established method was satisfactorily applied for the determination of flavonoids in Lycium barbarum (Goji) samples with relative recoveries in the range of 77.9-102.6%.

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Recent Developments in Solid-Phase Extraction for Near and Attenuated Total Reflection Infrared Spectroscopic Analysis

Cited by 14 publications

References 100 publications

Novel Molecular Spectroscopic Multimethod Approach for Monitoring Water Absorption/Desorption Kinetics of CAD/CAM Poly(Methyl Methacrylate) Prosthodontics

Novel Molecular Spectroscopic Multimethod Approach for Monitoring Water Absorption/Desorption Kinetics of CAD/CAM Poly(Methyl Methacrylate) Prosthodontics

The essential role of omni-capable research laboratories in advancing analytical spectroscopy

β‐Cyclodextrin‐modified three‐dimensional graphene oxide‐wrapped melamine foam for the solid‐phase extraction of flavonoids

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