Fourier transform infrared resonance spectroscopy-attenuated total

Simple and rapid spectroscopic methods, such as front-face fluorescence, attenuated total reflectance Fourier-transform infrared and nuclear magnetic resonance spectroscopies, have a great potential for investigation of the structure of fats in dairy products and of the relation between structure and texture. Although fluorescence, infrared and NMR spectroscopies are techniques, the theory and methodology of which have been exploited extensively in studies in both chemistry and biochemistry, the usefulness of these spectroscopies for molecular studies has not been yet fully recognized in food science. Fluorescence, infrared and NMR spectroscopies coupled... [Pg.705]

Surface modification of polyvinyl chloride films, both plasticised and unplasticised, using amino thiophenol in dimethyl formamide and water mixtures, was examined using attenuated total reflection fourier transform infrared spectroscopy, Raman spectroscopy and nuclear magnetic resonance spectroscopy. Reaction kinetics, and the amount of dioctyl phthalate plasticiser leached out during the reaction were determined. Surface selectivity and degree of modification was found to depend on reaction time. 19 refs. [Pg.51]

Increasing lA concentration in copol5mierization results in lower viscosities (Fig. 1.14). lA content of copol5miers was determined using Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR) and nuclear magnetic resonance (NMR) spectroscopies. The absoption bands at 1628 and 1730 cm due to C=0 stretching vibrations in carboxylic acid showed an increase... [Pg.38]

The stmctural and conformational analysis of proteins adsorbed to solid surfaces is difficult because most common analytical methods are not compatible with the presence of the interacting solids. With recent developments in instrumentation and techniques, our understanding of protein adsorption behavior has improved considerably [4, 14]. The most commonly used techniques include attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), radiolabeling techniques, immunofluorescence enzyme-linked immunosorbent assay (ELISA), ellipsometry, circular dichroism (CD) spectroscopy, surface plasmon resonance (SPR), and amide HX with nuclear magnetic resonance (NMR). Atomic force microscopy (AFM) and scanning... [Pg.266]

Spectroscopic techniques can be applied for monitoring conversion. Nuclear-magnetic resonance (NMR) and Fourier-transform infrared (FTIR) can be applied as offline techniques. However, spectroscopic techniques are arguably most attractive if they can be applied online. For example, attenuated total reflectance (ATR) FTIR has been applied to monitor the copolymerization of butyl acrylate and vinylacetate (Jovanovic Dube, 2003). Raman spectroscopy, in combination with a self-modelling curve-resolution technique, has... [Pg.162]

Several spectroscopic techniques have been apphed to determine surfactants in cosmetics with different aims conventional infrared spectroscopy (IR) and nuclear magnetic resonance (NMR) for qualitative analysis near infrared spectroscopy (NIR) and attenuated total reflectance Fourier transformed infrared spectroscopy (ATR-FTIR) for quantitative analysis atomic absorption spectroscopy (AAS) to determine specific surfactants. Mass... [Pg.300]

Silicone elastomers are covalently crosslinked networks with an effective infinite molecular weight and are, as such, insoluble and intractable. Consequently the interrogative spectroscopic and imaging methodologies that may be employed to probe such a network structure are almost wholly confined to the solid state. Surface vibrational spectroscopies attenuation total reflectance Fourier transform infrared (ATR-FTIR) and resonance Raman spectroscopy... [Pg.153]

A number of techniques have been employed that are capable of giving information about amorphous phases. These include infrared spectroscopy, especially the use of the attenuated total reflection (ATR) or Fourier transform (FT) techniques. They also include electron probe microanalysis, scanning electron microscopy, and nuclear magnetic resonance (NMR) spectroscopy. Nor are wet chemical methods to be neglected for they, too, form part of the armoury of methods that have been used to elucidate the chemistry and microstructure of these materials. [Pg.359]

Hsu and Marshall identified dyes in solid poly(methylmethylacrylate) by laser desorption Fourier Transform Ion Cyclotron Resonance Mass Spectrometry. Accurate mass measurements identified several red and orange dyes in untreated poly(methmethacrylate) at an order of magnitude lower (0.1%) than obtained by infrared attenuated total reflectance spectroscopy (1 - 2%). [Pg.95]