Are your frozen vegetables with sauces, seasonings, or dehydration processes that may contain hidden sulfites? Find out fast with Indigo® 10-500 ppm sulfite test strips.
Frozen vegetables are widely regarded as a clean, additive-free off-season. food choice. But many are processed moer than most people know. Frozen vegetables those sold with seasoning packets, sauces, breading, or stir-fry blends, may contain sulfites in their flavoring or preservative ingredients. Vegetables such as sweet potatoes and some root vegetables undergo dehydration or drying before freezing and are treated with sulfites to prevent browning. These products are not consistently labelled & create a risk for sensitive consumers and compliance challenges for food manufacturers, distributors, and professional kitchens.
| Factor | Indigo® Sulfite Test Strips | Certified Laboratory Analysis |
|---|---|---|
| Result time | Under 2 minutes | Days to weeks |
| Cost per test | Cents per strip | $50 – $200+ |
| Equipment needed | None | Specialized lab instruments |
| Detection range | 10 – 500 ppm | Full quantitative range |
| Accuracy | Semi-quantitative (screening) | Quantitative / precise |
| Best for | Incoming ingredient checks, production batch screening, frozen product QC | Regulatory submissions, supplier audits, label verification (see Documentation as well) |
| Used where | Receiving dock, production floor, commercial kitchen | Off-site laboratory |
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.
Great place for a hard to find product. Excellent price! Quick shipping.
Thanks for letting us know. This might interest you since you are in quality control: Can 10ppm of Sulfite & Quat Really Mean Zero?