Coacervative extraction of Ochratoxin A in wines prior to liquid chromatography/fluorescence determination

García-Fonseca, Sergio; Ballesteros‐Gómez, Ana; Rubio, Soledad; Pérez‐Bendito, Dolores

doi:10.1016/j.aca.2007.11.002

Cited by 44 publications

(17 citation statements)

References 31 publications

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“…Besides the immunoaffinity clean-up [29, 99, 112, 190, 192, 193], conventional SPE is used [31, 112, 194, 196]. Other sample preparation approaches are sometimes applied, such as on-line SPE [118], extract cleaning with lead hydroxyacetate [134], solid-phase microextraction [126, 191] and coacervative extraction [130]. In spite of clean-up, coeluting substances may appear in the chromatograms when dealing with complicated matrix [190].…”

Section: Methodsmentioning

confidence: 99%

“…Rarely, other sample preparation methods are also used, such as immunofiltration for DON [128] and AFB1 determination [44], diphasic dialysis extraction for PAT determination [129], coacervative extraction for simultaneous extraction and concentration of OTA in wines [130], use of supported liquid membrane for OTA determination [131] and capillary fused silica columns as the traps for the extraction of T-2 toxin from aqueous solutions [132]. Only individual applications are reported so far, but some may find wider application in the future.…”

Section: Sample Preparation and Pre-concentrationmentioning

confidence: 99%

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An Overview of Conventional and Emerging Analytical Methods for the Determination of Mycotoxins

Cigić

Prosen

2009

IJMS

179

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Abstract:Mycotoxins are a group of compounds produced by various fungi and excreted into the matrices on which they grow, often food intended for human consumption or animal feed. The high toxicity and carcinogenicity of these compounds and their ability to cause various pathological conditions has led to widespread screening of foods and feeds potentially polluted with them. Maximum permissible levels in different matrices have also been established for some toxins. As these are quite low, analytical methods for determination of mycotoxins have to be both sensitive and specific. In addition, an appropriate sample preparation and pre-concentration method is needed to isolate analytes from rather complicated samples. In this article, an overview of methods for analysis and sample preparation published in the last ten years is given for the most often encountered mycotoxins in different samples, mainly in food. Special emphasis is on liquid chromatography with fluorescence and mass spectrometric detection, while in the field of sample preparation various solid-phase extraction approaches are discussed. However, an overview of other analytical and sample preparation methods less often used is also given. Finally, different matrices where mycotoxins have to be determined are discussed with the emphasis on their specific characteristics important for the analysis (human food and beverages, animal feed, biological samples, environmental samples). Various issues important for accurate qualitative and quantitative analyses are critically discussed: sampling and choice of representative sample, sample preparation and possible bias associated with it, specificity of the analytical method and critical evaluation of results.

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Section: Methodsmentioning

confidence: 99%

Section: Sample Preparation and Pre-concentrationmentioning

confidence: 99%

An Overview of Conventional and Emerging Analytical Methods for the Determination of Mycotoxins

Cigić

Prosen

2009

IJMS

179

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“…Below this range, only a fraction of the decanoic acid was incorporated to the coacervate and, as a result, the recovery decreased. 35 The decrease of extraction recovery at higher volumes of ethanol is probably due to the dissolution of a portion of the coacervate and Ag-DTZ complex in ethanol-water bulk solution. Therefore, 600 µL of ethanol was selected as the optimum volume.…”

Section: Effect Of the Coacervate Compositionmentioning

confidence: 99%

“…In consequence, high extraction efficiencies can be achieved using low coacervate volumes which results in high concentration factors. Detailed studies on coacervation process of various alkanoic acid reverse micelles in miscible binary mixtures of water and a variety of protic and aprotic solvents and their potential for the extraction have been reported by Ruiz et al 29 This new separation/preconcentration technique has been used for the extraction of various contaminants such as bisphenols in different matrices, [31][32][33][34] ochratoxin A, 35 carcinogenic polycyclic aromatic hydrocarbons 36 prior to their determination by liquid chromatography, and arsenic 37 by electrothermal atomic absorption spectrometry. To the best of our knowledge, there is no previous literature report on the use of supramolecular solvent made up of decanoic acid reversed micelles and FAAS technique for the preconcentration and determination of silver ions in real samples.…”

Section: Introductionmentioning

confidence: 99%

Decanoic Acid Reverse Micelle-Based Coacervates for Microextraction of Silver in Natural Waters Prior to Flame Atomic Absorption Spectrometry Determination

Shokouhifar¹,

Hosseini²,

Jamali³

et al. 2016

Journal of the Brazilian Chemical Society

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In the present work, a novel, simple, and efficient method for the determination of silver in natural water samples was developed. The method is based on the extraction of silver with coacervate made up of decanoic acid reverse micelles and the subsequent determination by flame atomic absorption spectrometry (FAAS). Dithizone was used as a chelating agent. To obtain the best extraction results, some experimental parameters (such as coacervate composition, pH, concentration of chelating agent, and ionic strength) affecting the extraction efficiency were investigated and optimized. Under optimum conditions, the calibration curve was linear in the concentration range of 5-200 µg L -1 , with the correlation coefficient (r) equal to 0.995. The limit of detection and the enrichment factor were 1.6 µg L -1 and 15, respectively. The method was successfully applied to the analysis of silver in natural water samples.

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“…Recoveries between 85 and 100% were obtained. 139 Another recent approach to the problem is based on the use of solid-phase extraction of ochratoxin A from wine with a binding hexapeptide. 140 A hexapeptide library was prepared by combinatorial synthesis: from the library, a hexapeptide showing high affinity toward OTA was selected and used to prepare an immunoaffinity-like stationary phase to develop a solid-phase extraction method for OTA quantification.…”

Section: Winementioning

confidence: 99%

Sampling Techniques for the Determination of Mycotoxins in Food Matrices

Galaverna

Dall’Asta

2012

Comprehensive Sampling and Sample Preparation

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Coacervative extraction of Ochratoxin A in wines prior to liquid chromatography/fluorescence determination

Cited by 44 publications

References 31 publications

An Overview of Conventional and Emerging Analytical Methods for the Determination of Mycotoxins

An Overview of Conventional and Emerging Analytical Methods for the Determination of Mycotoxins

Decanoic Acid Reverse Micelle-Based Coacervates for Microextraction of Silver in Natural Waters Prior to Flame Atomic Absorption Spectrometry Determination

Sampling Techniques for the Determination of Mycotoxins in Food Matrices

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