Limits...
Sensing free sulfur dioxide in wine.

Monro TM, Moore RL, Nguyen MC, Ebendorff-Heidepriem H, Skouroumounis GK, Elsey GM, Taylor DK - Sensors (Basel) (2012)

Bottom Line: These processes and others consume the SO(2) over time, resulting in wines with little SO(2) protection.This approach adapts a known colorimetric reaction to a suspended core optical fiber sensing platform, and exploits the interaction between guided light located within the fiber voids and a mixture of the wine sample and a colorimetric analyte.We have shown that this technique enables measurements to be made without dilution of the wine samples, thus paving the way towards real time in situ wine monitoring.

View Article: PubMed Central - PubMed

Affiliation: Institute for Photonics & Advanced Sensing and School of Chemistry & Physics, The University of Adelaide, Adelaide, SA 5005, Australia. tanya.monro@adelaide.edu.au

ABSTRACT
Sulfur dioxide (SO(2)) is important in the winemaking process as it aids in preventing microbial growth and the oxidation of wine. These processes and others consume the SO(2) over time, resulting in wines with little SO(2) protection. Furthermore, SO(2) and sulfiting agents are known to be allergens to many individuals and for that reason their levels need to be monitored and regulated in final wine products. Many of the current techniques for monitoring SO(2) in wine require the SO(2) to be separated from the wine prior to analysis. This investigation demonstrates a technique capable of measuring free sulfite concentrations in low volume liquid samples in white wine. This approach adapts a known colorimetric reaction to a suspended core optical fiber sensing platform, and exploits the interaction between guided light located within the fiber voids and a mixture of the wine sample and a colorimetric analyte. We have shown that this technique enables measurements to be made without dilution of the wine samples, thus paving the way towards real time in situ wine monitoring.

Show MeSH
Calibration curve from 1–100 ppm using 7.8 × 10−4 mol/L PRA working solution in fiber 1. Data points not included in the calibration curve are shown as the hollow data points.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3472855&req=5

f9-sensors-12-10759: Calibration curve from 1–100 ppm using 7.8 × 10−4 mol/L PRA working solution in fiber 1. Data points not included in the calibration curve are shown as the hollow data points.

Mentions: The calibration curve for fiber 1 was plotted and is depicted in Figure 9. Some of the absorbance readings were higher than expected, possibly due to particulates settling on or near the fiber core and giving incorrect (high) readings, these results are illustrated (hollow data points), although they were not used to determine the line of best fit. Based on this, the solutions in subsequent measurements were filtered prior to filling the fiber. For the remaining data points in the range of sulfite solutions tested, good linearity was demonstrated (R2 = 0.9773).


Sensing free sulfur dioxide in wine.

Monro TM, Moore RL, Nguyen MC, Ebendorff-Heidepriem H, Skouroumounis GK, Elsey GM, Taylor DK - Sensors (Basel) (2012)

Calibration curve from 1–100 ppm using 7.8 × 10−4 mol/L PRA working solution in fiber 1. Data points not included in the calibration curve are shown as the hollow data points.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472855&req=5

f9-sensors-12-10759: Calibration curve from 1–100 ppm using 7.8 × 10−4 mol/L PRA working solution in fiber 1. Data points not included in the calibration curve are shown as the hollow data points.
Mentions: The calibration curve for fiber 1 was plotted and is depicted in Figure 9. Some of the absorbance readings were higher than expected, possibly due to particulates settling on or near the fiber core and giving incorrect (high) readings, these results are illustrated (hollow data points), although they were not used to determine the line of best fit. Based on this, the solutions in subsequent measurements were filtered prior to filling the fiber. For the remaining data points in the range of sulfite solutions tested, good linearity was demonstrated (R2 = 0.9773).

Bottom Line: These processes and others consume the SO(2) over time, resulting in wines with little SO(2) protection.This approach adapts a known colorimetric reaction to a suspended core optical fiber sensing platform, and exploits the interaction between guided light located within the fiber voids and a mixture of the wine sample and a colorimetric analyte.We have shown that this technique enables measurements to be made without dilution of the wine samples, thus paving the way towards real time in situ wine monitoring.

View Article: PubMed Central - PubMed

Affiliation: Institute for Photonics & Advanced Sensing and School of Chemistry & Physics, The University of Adelaide, Adelaide, SA 5005, Australia. tanya.monro@adelaide.edu.au

ABSTRACT
Sulfur dioxide (SO(2)) is important in the winemaking process as it aids in preventing microbial growth and the oxidation of wine. These processes and others consume the SO(2) over time, resulting in wines with little SO(2) protection. Furthermore, SO(2) and sulfiting agents are known to be allergens to many individuals and for that reason their levels need to be monitored and regulated in final wine products. Many of the current techniques for monitoring SO(2) in wine require the SO(2) to be separated from the wine prior to analysis. This investigation demonstrates a technique capable of measuring free sulfite concentrations in low volume liquid samples in white wine. This approach adapts a known colorimetric reaction to a suspended core optical fiber sensing platform, and exploits the interaction between guided light located within the fiber voids and a mixture of the wine sample and a colorimetric analyte. We have shown that this technique enables measurements to be made without dilution of the wine samples, thus paving the way towards real time in situ wine monitoring.

Show MeSH