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Analysis of Sulfites in Shrimp Using Rapid Distillation Followed by Redox Titration 1
Marian V Simpson1, W Steven Otwell1, Maurice R Marshall1
1Food Science and Human Nutrition Department and Department of Statistics, University of Florida, IFAS, Gainesville, Florida 32611.
Abstract:
The use of rapid steam distillation followed by redox iodine titration provides a rapid and accurate determination of total sufite residual in shrimp. Values obtained for sulfite-treated shrimp using the rapid distillation method gave comparable results to those of the officially recognized Monier-Williams method. Values for the rapid distillation method ranged from 6 to 212 ppm while those of the Monier-Williams procedure ranged from 6 to 241 ppm for untreated and treated shrimps, respectively. Statistical analysis using two-sample Student's t-test indicated that there were no significant differences (p>0.05) for residual levels below 100 ppm but the values obtained by the rapid distillation method and the Monier-Williams procedure were significantly different (p<0.05) at concentrations near and above 100 ppm.
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