Dried Fruit

SKU: 33817-S

$26.25USD or lower Each

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If you've ever shopped for dried fruit such apples, you may have noticed that some bins have ones that appear to be unblemished while others are quite brown. The unblemished (unoxidized) sliced, dried may have been dipped into a sulfite preservative solution. Indigo® test strips can detect sulfite on dried fruit from 10 to 500ppm; see directions below for testing the surface of a dried fruit.

Here's what one customer had to say: "...stunned by the accuracy...tested heavily sulfited dry fruit...was 10ppm and it was dead on." Read the full review on Google.

Details Specs Reviews
Details

You can test dried fruits for sulfite easily by first wetting the suflite test strip pad with water (distilled or deionized ideally). The, press against the food item & compare to the color chart. If free sulfite is present above 10ppm, the pad will change color.

Because the sulfite preservative is only on the surface, you need to take the entire weight (mass) of the fruit into consideration. Read more in our blog on what the 10ppm level really means.

The presence of sulfites may be listed on food labels as: sulfur dioxide, potassium bisulfite, potassium metabisulfite, sodium bisulfite, sodium metabisulfite, or sodium sulfite.

For those interested in the chemistry of how these strips work, please refer to this pdf which explains the theory of how free sulfite is detected.

Related information or images
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Specifications

This Indigo® test strip indicates the presence of sulfite ion in increments of 10, 50, 100, 250, and 500ppm after 15 seconds.

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Sulfite Test Strips 0-500ppm Stability Statement Indigo Sulfite Test Strips 0-500ppm Certificate of Analysis Indigo Sulfite Test Strips 0-500ppm SDS
Reviews (2)
2023-10-27

Test strips worked as described, including the red wine citric acid method. I first did some comparisons using sulfites in water. Dipping the strips and the citric acid method gave the same result, albeit a little lower than expected. Solution was mixed to 100 ppm and both strips showed about 75. Used a similar technique on red wine, although dipping does not work. Wine with no sulfites showed zero. Added and got similar readings to the water results. Thanks for the great product and the citric acid trick.

2021-01-22

Great place for a hard to find product. Excellent price! Quick shipping.

— Quality Control
— Indigo:

Thanks for letting us know. This might interest you since you are in quality control: Can 10ppm of Sulfite & Quat Really Mean Zero?

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