Front-face fluorescence spectroscopy: A new tool for control in the wine industry

Airado‐Rodríguez, Diego; Durán-Merás, Isabel; Galeano-Dı́az, Teresa; Wold, Jens Petter

doi:10.1016/j.jfca.2010.10.005

Cited by 129 publications

(86 citation statements)

References 27 publications

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“…The presence of other fluorescent compounds including aromatic amino acids (tyrosine and phenylalanine) and water-soluble vitamins B 2 and B 6 was also reported in apples (Christensen et al 2006;Feliciano et al 2010;Wu et al 2007). Based on the published data, the emission of vitamins B 2 and B 6 and of the products of the non-enzymatic browning should be expected rather in the intermediate range, while the aromatic amino acids should emit in the short-wavelength range (Airado-Rodríguez et al 2011;Christensen et al 2006). The longerwavelength band with a very low intensity with the maximum at 655 nm corresponds to chlorophyll (Christensen et al 2006).…”

Section: Resultsmentioning

confidence: 82%

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Screening of Antioxidant Properties of the Apple Juice Using the Front-Face Synchronous Fluorescence and Chemometrics

et al. 2016

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Fluorescence spectroscopy is gaining increasing attention in food analysis due to its higher sensitivity and selectivity as compared to other spectroscopic techniques. Synchronous scanning fluorescence technique is particularly useful in studies of multi-fluorophoric food samples, providing a further improvement of selectivity by reduction in the spectral overlapping and suppressing light-scattering interferences. Presently, we study the feasibility of the prediction of the total phenolics, flavonoids, and antioxidant capacity using front-face synchronous fluorescence spectra of apple juices. Commercial apple juices from different product ranges were studied. Principal component analysis (PCA) applied to the unfolded synchronous fluorescence spectra was used to compare the fluorescence of the entire sample set. The regression analysis was performed using partial least squares (PLS1 and PLS2) methods on the unfolded total synchronous and on the single-offset synchronous fluorescence spectra. The best calibration models for all of the studied parameters were obtained using the PLS1 method for the single-offset synchronous spectra. The models for the prediction of the total flavonoid content had the best performance; the optimal model was obtained for the analysis of the synchronous fluorescence spectra at Δλ = 110 nm (R 2 = 0.870, residual predictive deviation (RPD) = 2.7). The optimal calibration models for the prediction of the total phenolic content (Δλ = 80 nm, R 2 = 0.766, RPD = 2.0) and the total antioxidant capacity (Δλ = 70 nm, R 2 = 0.787, RPD = 2.1) had only an approximate predictive ability. These results demonstrate that synchronous fluorescence could be a useful tool in fast semiquantitative screening for the antioxidant properties of the apple juices.

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Section: Resultsmentioning

confidence: 82%

“…The SyF spectra of catechin and epicatechin, to our best knowledge, have not been reported previously. Based on excitation and emission properties of these compounds, they should rather contribute to the short-wavelength emission in the SyF spectra (Airado-Rodríguez et al 2011).…”

Section: Resultsmentioning

confidence: 99%

Screening of Antioxidant Properties of the Apple Juice Using the Front-Face Synchronous Fluorescence and Chemometrics

et al. 2016

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“…It also has been successfully used for measuring fluorescing compounds in samples with very large absorbances. 27,28 The LS-50B spectrofluorometer (Perkin Elmer, UK) has a fiber optic accessory cable for front-face fluorescence detection. Figure 1(b) shows the positioning of the optical fiber on top of the microfluidic platform.…”

Section: A Simple Front-face Fluorescence Detection For Microfluidic mentioning

confidence: 99%

Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water

et al. 2018

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A microfluidic method with front-face fluorometric detection was developed for the determination of total inorganic iodine in drinking water. A polydimethylsiloxane (PDMS) microfluidic device was employed in conjunction with the Sandell-Kolthoff reaction, in which iodide catalyzed the redox reaction between Ce(IV) and As(III). Direct alignment of an optical fiber attached to a spectrofluorometer was used as a convenient detector for remote front-face fluorometric detection. Trace inorganic iodine (IO3 -and I -) present naturally in drinking water was measured by on-line conversion of iodate to iodide for determination of total inorganic iodine. On-line conversion efficiency of iodate to iodide using the microfluidic device was investigated. Excellent conversion efficiency of 93 -103% (%RSD = 1.6 -11%) was obtained. Inorganic iodine concentrations in drinking water samples were measured, and the results obtained were in good agreement with those obtained by an ICP-MS method. Spiked sample recoveries were in the range of 86%(±5) -128%(±8) (n = 12). Interference of various anions and cations were investigated with tolerance limit concentrations ranging from 10 -6 to 2.5 M depending on the type of ions. The developed method is simple and convenient, and it is a green method for iodine analysis, as it greatly reduces the amount of toxic reagent consumed with reagent volumes in the microfluidic scale.

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“…Recently, it has been shown that excitation-emission matrix (EEM) fluorescence spectroscopy and three-way statistical methods, concretely Parallel Factor Analysis (PARAFAC) can be used for distinguishing between wine samples of different appellations, or between wine samples obtained with different ageing procedure (Airado-Rodrıguez et al, 2011). At first, excitation-emission matrices (EEMs) were obtained and examined with the aim of identifying the main families of fluorescent compounds.…”

Section: Food Analysismentioning

confidence: 99%

Current Achievement and Future Potential of Fluorescence Spectroscopy

Al-Rawashdeh¹

2012

Macro to Nano Spectroscopy

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Front-face fluorescence spectroscopy: A new tool for control in the wine industry

Cited by 129 publications

References 27 publications

Screening of Antioxidant Properties of the Apple Juice Using the Front-Face Synchronous Fluorescence and Chemometrics

Screening of Antioxidant Properties of the Apple Juice Using the Front-Face Synchronous Fluorescence and Chemometrics

Microfluidic Analysis with Front-Face Fluorometric Detection for the Determination of Total Inorganic Iodine in Drinking Water

Current Achievement and Future Potential of Fluorescence Spectroscopy

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