The Analysis of Edible Oils Using ATR FTIR
6 Sept 2017Edible oils are a series of related natural compounds differing in their degree of unsaturation and chain length. Chemically, these compounds are esters of various fatty acids with a single trifunctional alcohol (glycerol), and are hence called triglycerides. The degree of unsaturation of an edible oil is considered an important factor in its suitability as a food product and this application note - involving six different types of natural oil - shows how infrared spectroscopy can be complementary to traditional techniques for analyzing such oils. It is comparatively easy to identify absorbance bands that can be assigned to C-H vibrations in both saturated and unsaturated compounds. Peak height or area measurements allow the degree of unsaturation to be measured.
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Gateway HATR multiple reflection ATR
Specac LtdSpecac’s Gateway™ ATR Accessory Kit is an economical multi-reflection horizontal ZnSe ATR accessory. With high-performance transfer optics and anti-reflection coated ZnSe crystals as standard, high optical throughput is achieved to facilitate an excellent standard of FTIR ATR spectral data. The Gateway™ ATR Accessory Kit consists of: an optical unit; a trough top-plate with a 45° angle ZnSe crystal; a flat top-plate with a 45° angle ZnSe crystal; and, a clamp assembly. The trough top-plate is used for liquids and pastes analysis, and the flat top-plate and clamp assembly are used for solids and powders analysis. This accessory is simple to install and use in a wide range of spectrometer systems. A wide range of interchangeable crystal ATR top-plates and sampling accessories can be used on the Gateway™ ATR Accessory optical unit to provide unrivaled multi-reflection ATR sampling versatility. These allow the Gateway™ ATR Accessory to be configured for the analysis of all types of samples (for example: solids, films, pastes, liquids) under a range of conditions (for example: static or flow conditions, and heating applications up to 200°C). All of the accessories are factory aligned. All top-plates are fitted as standard with a 6 reflection ZnSe ATR crystal with a 45° angle of incidence, but other crystal materials and incident angles are available on request. The Gateway™ ATR Accessory is a Benchmark™ baseplate compatible accessory. Features and Benefits: • High optical throughput • Easy alignment • Purgeable optics • Extensive range of optional top-plates • Replaceable crystals