Application of MALDI-TOFMS Combined with Partial Least Square Regression for the Determination of Mercury and Copper in Canned Tuna, Using ... View Full Text


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Article Info

DATE

2018-04-30

AUTHORS

Manuel Mendez Garcia, Kazimierz Wrobel, Alejandra Sarahi Ramirez Segovia, Eunice Yanez Barrientos, Alma Rosa Corrales Escobosa, Oracio Serrano, Francisco Javier Acevedo Aguilar, Katarzyna Wrobel

ABSTRACT

In this work, a procedure for the determination of mercury and copper in canned tuna samples is presented, based on the extraction of their respective dithizone complexes and quantification by conventional MALDI-TOFMS with the aid of partial least square regression (PLS2). Methanolic dithizone solution (1 ml, 0.01% m/v) containing Ag(I) as internal standard was added to the calibration solutions and to the acid-digested samples (5 ml, pH 3); copper, mercury, and silver complexes were extracted to cyclohexane (1.5 ml), and after evaporation, the residues were re-constituted in acetone (100 μl). The samples were prepared by dried droplet crystallization with α-cyano-4-hydroxycinnamic acid. The experimental and MALDI-TOFMS instrument operating conditions were set up under criteria of as high as possible detectability and repeatability. When univariate calibration was carried out using the most intense ion of Cu or Hg complex normalized by internal standard, determination seemed feasible yet precision of the results was poor. Taking baseline-corrected spectra in m/z range 560–725, PLS2 model was constructed for the prediction of two elements with the method quantification limits 63 μg kg−1 for Cu and 75 μg kg−1 for Hg, respectively. For different brands of canned tuna, the results obtained by MALDI-TOFMS combined with PLS2 and by ICP-MS were in good agreement. The proposed procedure is an attractive alternative for the determination of trace metals in foods because of the procedural simplicity, micro-scale dimension, high speed of data acquisition/processing, and the cost of instrument operation lower as compared to any atomic spectrometry technique. More... »

PAGES

2835-2846

References to SciGraph publications

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  • 2016-05-31. Identification of metal species by ESI-MS/MS through release of free metals from the corresponding metal-ligand complexes in SCIENTIFIC REPORTS
  • 2014-03-21. Recent methodological advances in MALDI mass spectrometry in ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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  • 2011-04-01. Recent directions of electrospray mass spectrometry for elemental speciation analysis in ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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  • 2014-04-02. Determination of rhenium and osmium complexes by surface-assisted laser desorption/ionization coupled to Orbitrap mass analyzer in ANALYTICAL AND BIOANALYTICAL CHEMISTRY
  • 2014-11-30. Molybdenum and Copper in Four Varieties of Common Bean (Phaseolus vulgaris): New Data of Potential Utility in Designing Healthy Diet for Diabetic Patients in BIOLOGICAL TRACE ELEMENT RESEARCH
  • 2002-06-12. Small molecule analysis by MALDI mass spectrometry in ANALYTICAL AND BIOANALYTICAL CHEMISTRY
  • 1996-01-01. Electrospray ionization of copper—glycine solutions in JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
  • 2005-04-18. Solvent Sublation Using Dithizone as a Ligand for Determination of Trace Elements in Water Samples in MICROCHIMICA ACTA
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    23 schema:description In this work, a procedure for the determination of mercury and copper in canned tuna samples is presented, based on the extraction of their respective dithizone complexes and quantification by conventional MALDI-TOFMS with the aid of partial least square regression (PLS2). Methanolic dithizone solution (1 ml, 0.01% m/v) containing Ag(I) as internal standard was added to the calibration solutions and to the acid-digested samples (5 ml, pH 3); copper, mercury, and silver complexes were extracted to cyclohexane (1.5 ml), and after evaporation, the residues were re-constituted in acetone (100 μl). The samples were prepared by dried droplet crystallization with α-cyano-4-hydroxycinnamic acid. The experimental and MALDI-TOFMS instrument operating conditions were set up under criteria of as high as possible detectability and repeatability. When univariate calibration was carried out using the most intense ion of Cu or Hg complex normalized by internal standard, determination seemed feasible yet precision of the results was poor. Taking baseline-corrected spectra in m/z range 560–725, PLS2 model was constructed for the prediction of two elements with the method quantification limits 63 μg kg−1 for Cu and 75 μg kg−1 for Hg, respectively. For different brands of canned tuna, the results obtained by MALDI-TOFMS combined with PLS2 and by ICP-MS were in good agreement. The proposed procedure is an attractive alternative for the determination of trace metals in foods because of the procedural simplicity, micro-scale dimension, high speed of data acquisition/processing, and the cost of instrument operation lower as compared to any atomic spectrometry technique.
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    31 Hg
    32 Hg complexes
    33 ICP-MS
    34 MALDI-TOFMS
    35 Methanolic dithizone solution
    36 PLS2
    37 PLS2 model
    38 TOFMS instrument operating conditions
    39 acetone
    40 acid
    41 acid-digested samples
    42 acquisition/processing
    43 agents
    44 agreement
    45 aid
    46 alternative
    47 applications
    48 atomic spectrometry techniques
    49 attractive alternative
    50 baseline-corrected spectra
    51 brands
    52 calibration
    53 calibration solutions
    54 canned tuna
    55 canned tuna samples
    56 complexes
    57 complexing agent
    58 conditions
    59 conventional MALDI-TOFMS
    60 copper
    61 cost
    62 criteria
    63 crystallization
    64 cyano-4-hydroxycinnamic acid
    65 data acquisition/processing
    66 detectability
    67 determination
    68 determination of mercury
    69 different brands
    70 dimensions
    71 dithizone
    72 dithizone complex
    73 dithizone solution
    74 droplet crystallization
    75 elements
    76 evaporation
    77 extraction
    78 food
    79 good agreement
    80 high speed
    81 instrument operating conditions
    82 instrument operation
    83 intense ions
    84 internal standard
    85 ions
    86 least squares regression
    87 mercury
    88 metals
    89 method quantification
    90 micro-scale dimensions
    91 model
    92 operating conditions
    93 operation
    94 partial least squares regression
    95 possible detectability
    96 precision
    97 prediction
    98 procedural simplicity
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    110 simplicity
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    113 spectrometry techniques
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