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Development of Colorimetric Sensor Array for Instant Determination of Sodium Metabisulfite in Dried Longan

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Abstract

Sodium metabisulfite has been used as a pretreatment chemical to prevent the gradual discoloration and to slow down the spoilage process of dried longan. The excessive use of this sulfiting agent can result in allergic reactions, particularly for sulfite-sensitive people. In this research study, a colorimetric strip was fabricated to determine the concentration of sodium metabisulfite in dried longan. The detection was based on reactions of a series of colorimetric reagents including four different Fuchsine compounds and an Ellman’s regent. The maximum change of color was observed 3 min after the reactions. To perform a quantitative analysis, the image of the strip was captured using a commercial scanner, and it was converted into an RGB color model to be digitally analyzed by chemometrics. Using partial least square (PLS) regression, the calibration range (5.00–250.00 mg/kg) provided R2 and Q2 values of 0.994 and 0.908, respectively. The limits of detection and quantitation were 5.48 and 16.6 mg/kg, which were sensible for the detection of the sulfiting agent in dried longan samples. The developed colorimetric strip was applied to determine the concentration of metabisulfite in dried longan fruit purchased from local markets in Chiang Mai, Thailand. The results agreed well with the findings obtained from the standard reference method. The developed strip could be an alternative solution for rapid, simple, and low-cost detection of the sulfiting agent in dried agricultural products, where test results could be instantly obtained without the requirement of sophisticated analytical instruments.

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Funding

This research was supported by Thailand Research Fund (TRF, Grant No. MRG6280041) and partially supported by Chiang Mai University. The Center of Excellence for Innovation in Chemistry (PERCH-CIC), Ministry of Higher Education, Science, Research and Innovation, is also gratefully acknowledged.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand

    Chanida Krongchai, Jaroon Jakmunee & Sila Kittiwachana

  2. Environmental Science Research Center (ESRC), Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand

    Jaroon Jakmunee & Sila Kittiwachana

  3. Center of Excellence for Innovation in Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand

    Sila Kittiwachana

Authors
  1. Chanida Krongchai
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  2. Jaroon Jakmunee
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  3. Sila Kittiwachana
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Correspondence to Sila Kittiwachana.

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Chanida Krongchai declares that she has no conflict of interest. Jaroon Jakmunee declares that he has no conflict of interest. Sila Kittiwachana declares that he has no conflict of interest.

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Krongchai, C., Jakmunee, J. & Kittiwachana, S. Development of Colorimetric Sensor Array for Instant Determination of Sodium Metabisulfite in Dried Longan. Food Anal. Methods 13, 1717–1725 (2020). https://doi.org/10.1007/s12161-020-01797-1

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  • DOI: https://doi.org/10.1007/s12161-020-01797-1

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