Search results for "Ratio method"

showing 2 items of 2 documents

Qualitative and quantitative thermoluminescence analysis on irradiated oregano

2007

Abstract Thermoluminescence (TL) dosimetry is one of the physical methods used for the identification of irradiated food, suitable for foods from which silicate minerals can be extracted. The aims of the present work were to apply the TL analysis for a qualitative identification of irradiated oregano, and to set up a quantitative procedure to estimate the original treatment dose on the sample. The experimental results show that the TL analysis allows to distinguish irradiated oregano even seven months after the treatment. The additive dose procedure gives a rough estimation of the treatment dose, but can be helpful when the TL ratio method is unsatisfactory.

Food irradiationMaterials scienceThermoluminescenceRadiochemistryThermoluminescenceSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Qualitative analysisTreatment doseRatio methodDetection of irradiated foodDosimetryFood irradiationIrradiationQuantitative analysis (chemistry)Food ScienceBiotechnologyFood Control
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Computerized Interpretation of H P L C Chromatogramms by Means of Absorbance Ratio Method and Derivative Spectroscopy

1985

As in other chromatographic processes it is the aim of high pressure liquid chromatography (HPLC) to identify the components of a mixture, whereby there may be some information on the class of substances in question. The analytical procedure can shortly be desribed as follows. The mixture is injected in a mobile phase (solvent) and passes a column where the separation takes place. The separated components leave the column at different retention times. A following detection device generates a signal as a function of concentration (chromatographic peak). Usually the components are identified by relating retention times of external standards to the times of occurence of chromatographic peaks. …

SolventAbsorbanceChromatographyChemistryRatio methodPhase (matter)Analytical chemistryHigh-performance liquid chromatographyDerivative spectroscopyInterpretation (model theory)
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