Search results for "AREs"
showing 10 items of 1717 documents
Sweeteners determination in table top formulations using FT-Raman spectrometry and chemometric analysis
2004
Abstract A partial least squares (PLS) Fourier transform Raman spectrometry procedure based on the measurement of solid samples contained inside standard glass vials, has been developed for direct and reagent-free determination of sodium saccharin and sodium cyclamate in table top sweeteners. A classical 22 design for standards was used for calibration, but this system provides accuracy errors higher than 13% w/w for the analysis of samples containing glucose monohydrate. So, an extended model incorporating glucose monohydrate (23 standards) was assayed for the determination of sodium saccharin and sodium cyclamate in all the samples. Mean centering spectra data pre-treatment has been emplo…
Investigating semi-hard cheese aroma: Relationship between sensory profiles and gas chromatography-olfactometry data
2012
Abstract The purpose of this study was to investigate semi-hard cheese aroma by explaining sensory characteristics of cheese by gas chromatography–olfactometry (GC–O) data obtained via intensity ratings. Sensory (13 odour attributes) and GC–O profiles obtained by trained panels were carried out on seven non-processed semi-hard cheeses. Intensity scores for significant sensory attributes and significant odour-active compounds were analysed by partial least squares to determine correlations between these datasets. A total of nine sensory attributes and 15 odour-active molecules significantly discriminated between the cheeses. There were strong correlations (89% of the sensory data was explain…
Identification of compounds responsible for the odorant properties of aromatic caramel
2012
Aromatic caramel results from the heat treatment of sugars under specific temperature conditions. Because of its richness in aroma compounds and its pleasant organoleptic properties, caramel is widely used in the food industry. However, the composition of the volatile odorant fraction has not been completely elucidated. The aim of this work was thus to identify the volatile odorant compounds responsible for caramel sensory properties using a multivariate statistical technique. Four aromatic caramels differing in terms of their carbohydrate composition and cooking process were chosen. Odorant compounds were screened by gas chromatography–olfactometry (GC-O) and identified by GC–mass spectrom…
Determination of lecithin and soybean oil in dietary supplements using partial least squares-Fourier transform infrared spectroscopy.
2008
Lecithin and soybean oil in dietary supplements were determined by Fourier transform infrared spectrometry transmission measurements in dichloromethane in combination with a partial least squares (PLS) regression. Two different PLS models were developed, using 16 synthetic mixtures of analytes in dichloromethane, making measurements in the spectral range from 931.8 to 1252.3 cm(-1) for lecithin and from 911.4 to 1246.9 cm(-1) and 1695.3 to 1774.5 cm(-1) for soybean oil. Seven products from the Spanish market with lecithin concentrations between 21.1% and 99.1% and soybean oil concentrations between 0% and 37.2% were analyzed by the proposed method and the data was compared to a chromatograp…
Simultaneous Kinetic Determination of Carbamate Pesticides after Derivatization withp-Aminophenol by Using Partial Least Squares
1996
Abstract A method has been developed for the fast spectrophotometric determination of propoxur, carbaryl, and ethiofencarb in water samples using injection analysis in the stopped-flow mode. The method is based on the reaction between p -aminophenol and the phenolic compounds obtained from the pesticides, after a previous hydrolysis with 0.05 M NaOH at room temperature for 15 min. The partial least-squares treatment of the spectrophotometry kinetic data provides a simultaneous determination of the three carbamate pesticides assayed with a relative accuracy error lower than 5% in complex mixtures also containing formetanate, which is only partially hydrolyzed under the experimental condition…
Biopartitioning micellar chromatography to pedict mutagenicity of aromatic amines
2007
[EN] Mutagenicity is a toxicity endpoint associated with the chronic exposure to chemicals. Aromatic amines have considerable industrial and environmental importance due to their widespread use in industry and their mutagenic capacity. Biopartitioning micellar chromatography (BMC), a mode of micellar liquid chromatography that uses micellar mobile phases of Brij35 in adequate experimental conditions, has demonstrated to be useful in mimicking the drug partitioning process into biological systems. In this paper, the usefulness of BMC for predicting mutagenicity of aromatic amines is demonstrated. A multiple linear regression (MLR) model based on BMC retention data is proposed and compared wi…
Metaforas Cicerona darbā Epistulae ad Familiares
2020
Maģistra darba Metaforas Cicerona darbā Epistulae ad Familiares mērķis ir izpētīt metaforu lietojumu un nozīmi Cicerona pilsoņu kara laikā rakstītajās vēstulēs. Darbā tiek analizētas vēstules trīs adresātu grupās – ģimene, draugi un politiskas personas. Darba teorētiskā daļa tiek balstīta uz antīko teorētiķu atziņām par metaforu un tās nozīmi, kā arī mūsdienu zinātniskās literatūras avotos esošajā informācijā gan par metaforu, gan par epistolāro žanru un Cicerona epistolāro mantojumu. Pētījuma praktiskajā daļā tiek analizēta metaforu dažādība atkarībā no adresāta un vēstules tematikas. Metaforas tiek iedalītas, izmantojot Dž. Leikofa un M. Džonsona piedāvāto metaforu klasifikāciju – struktu…
Usage assignment of the residence in the cases of familiar crises: commentary on the article 6 Valencian Law of familiar relations
2015
En este trabajo se analiza la regulación valenciana respecto a la atribución del uso de la vivienda familiar, tomando en consideración las sentencias dictadas en aplicación del art. 6 de la Ley de relaciones familiares. In this paper we study the Valencian regulation with regard to the assignment of the usage of the familiar residence, taking in consideration the judgments dictated in application of the article 6 law of familiar relations.
Fine del mondo e censura. Su La mafia non è più quella di una volta di Franco Maresco
2021
L'articolo indaga le forme del cinema politico contemporaneo, soffermandosi sull'ultimo film di Franco Maresco: La mafia non è più quella di una volta.
Influence of smoking upon the postoperative course of lower third molar surgery
2006
Our objective was to determine whether smoking influences the postoperative course (pain and trismus) of lower third molar surgery, with a clinical evaluation of surgical wound condition and analysis of the possible differences between smokers and nonsmokers. The study subjects were randomly distributed into two groups (smokers and nonsmokers) and subjected to lower third molar extraction in the Unit of Oral and Maxillofacial Surgery (Madrid Complutense University, Spain). The study variables were trismus after 7 days, the intensity of pain and the need for rescue medication during a period of one week. The surgical wound was also assessed (color, presence of plaque, etc.). Two cases of pos…