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Potassium Sorbate Residue Levels and Persistence in Citrus Fruit as Detected by a Simple Colorimetric Method

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URI
http://hdl.handle.net/20.500.11939/5670
DOI
10.1021/jf900070k
Derechos de acceso
openAccess
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Author
Montesinos-Herrero, Clara; Smilanick, Joseph L.; Hurley, J. Michael; Palou, Lluís
Date
2009
Cita bibliográfica
Montesinos-Herrero, C., Smilanick, J.ph L., Hurley, J. Michael, Palou, L. (2009). Potassium Sorbate Residue Levels and Persistence in Citrus Fruit as Detected by a Simple Colorimetric Method. Journal of Agricultural and Food Chemistry, 57(9), 3458-3463.
Abstract
A colorimetric method that employed extraction of the macerated fruit, followed by a reaction with 2-thiobarbituric acid, was used to quantify potassium sorbate residues in citrus fruit. A recovery of more than 90% in oranges and lemons was obtained. Potassium sorbate residues determined by this method and a standard high-performance liquid chromatography (HPLC) method were similar. Residues were proportionate to the potassium sorbate concentration in the treatment solution. In oranges stored at 15 degrees C, following the potassium sorbate treatments, residues declined initially rapidly and later more slowly, until residues stopped declining after 6 days. A brief double-dip rinse in tap water applied immediately after immersion of lemons in a 2% (wt/vol) potassium sorbate removed more than 90% of the potassium sorbate residue. The influence of high-pressure water washing (HPWW) on potassium sorbate residues in potassium-sorbate-treated fruit was determined. Potassium sorbate residues were more effectively reduced by rinsing oranges than lemons.
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