Search results for "SPME"

Chromatographic fingerprint of the volatile fraction of rare Hedera helix honey and biomarkers identification

2018

Hedera helix (Irish ivy) honey is a very rare food product used in Ireland. The composition of the volatile fraction of this unique honey was studied for the first time using three different extraction procedures (SPE, USE and HS–SPME) and analyzed with gas chromatography and mass spectrometry. As expected, the use of combined techniques resulted in the identification of the detailed composition of honey volatiles. Identified constitutes belongs to the different chemical classes. The presence of 4(1H)-quinolinone, myrtenal and phenylacetonitrile was proposed as biomarkers of the botanical origin of ivy honey. Moreover, they are not widely widespread among honeys of different botanical origi…

Analysis of furan in toasted coffee by HS/SPME-GC-MS

2008

STUDY OF VOLATILE COMPONENTS OF TEN VARIETIES OF SALVIA BY SPME-GC/MS AND GENERAL DISCRIMINANT ANALYSIS

2011

Applicazioni di spettrometria di massa in campo alimentare: analisi di olii di oliva tramite HPLC-Ms e HS-SPME-GC-MS

2008

Comparison between Different Techniques for Volatiles Analyses in Coriander (Coriandrum sativum L.)

2011

Although many papers have been devoted to the study of Coriander fruits aromatic pattern, many differences show up according not only to the provenience of seeds, but also to the analytical methods chosen. In our work, samples from one Coriander small-seeded biotype has been analysed, verifying the differences between (1) the oil extracted by means of a Soxhlet apparatus (2) the same oil sampled by means of HS-SPME and (3) the HS-SPME on the roughly ground seeds, all analysed by direct injection in the GC-MS. The volatile composition detected by means of HS-SPME on oil resembles tightly that performed on Soxhlet extract. With respect to the direct injection, the HS-SPME shows a higher sensi…

Analysis of furan in coffee of different provenance by head-space solid phase microextraction gas chromatography-mass spectrometry: effect of brewing…

2009

A simple, sensitive and accurate method for the analysis of furan in roasted coffee has been used based on headspace-solid-phase micro-extraction (HS-SPME) coupled to gas chromatography-mass spectrometry (GC-MS). The extraction was performed using 75-microm carboxen/polydimethylsiloxane fiber. Ionic strength, extraction time and temperature, and desorption time were assessed as the most important parameters affecting the HS-SPME procedure and d(4)-furan was used as the internal standard. The linearity range was in the range 0.0075-0.486 ng g(-1); the LOD and LOQ calculated using the signal-to-noise ratio approach were 0.002 and 0.006 ng g(-1), respectively. The inter- and intra-day precisio…

New strategies for improving the sustainability of analytical methods in different matrices

2021

El concepto “sostenible” apareció en los años 70 con el objetivo de relacionar el desarrollo económico y la conservación de los ecosistemas. La palabra sostenibilidad se debe al informe Brundland realizado en 1987 en el marco de la Comisión de las Naciones Unidas para el Medio Ambiente. Este informe advirtió sobre las consecuencias ambientales negativas del desarrollo económico y la globalización, tratando de ofrecer soluciones a los problemas derivados del crecimiento demográfico y la industrialización. Particularizando en la Química, el calificativo sostenible aporta un enfoque holístico, que establece políticas y objetivos medibles para un proceso continuo de mejora. En este contexto, la…

La Tecnica della microestrazione in fase solida (SPME) per l'analisi quantitativa e qualitativa dei feromoni sessuali degli insetti fitofagi: il caso…

2002

Improving the On-Line Extraction of Polar Compounds by IT-SPME with Silica Nanoparticles Modified Phases

2018

In the present work the extraction efficiency of in-tube solid-phase microextraction (IT-SPME) for polar herbicides has been evaluated using extractive capillaries coated with different polymeric sorbents. For this purpose, aqueous solutions of herbicides with a wide range of polarities, including some highly polar compounds (log Kow < 1), have been directly processed by IT-SPME coupled on-line to capillary liquid chromatography with UV-diode array detection. For extraction, commercially available capillary columns coated with polydimethylsiloxane (PDMS) and polyetilenglicol (PEG)-based phases have been used, and the results have been compared with those obtained with a synthesized tetra…

Multivariate approach to reveal relationships between sensory perception of cheeses and aroma profile obtained with different extraction methods

2014

A new and original statistical approach was used to compare the effectiveness of 4 different methods to analyse aroma compounds of seven different commercial semi-hard cheeses with regard to their orthonasal sensory perception. Four extraction methods were evaluated: Purge and Trap, Artificial Mouth, Solid-Phase Microextraction (SPME) and Solvent-Assisted Flavour Evaporation (SAFE). Among the headspace methods, Artificial Mouth gave the closest representation of the studied product space to the sensory perception one. The SAFE method was complementary to the dynamic headspace methods, as it was very efficient in extracting the heavy molecules but less efficient for extracting the most volat…