The strips have been tested on red wine, white wine, homogenized whole milk, cultured buttermilk, almond milk, yogurt, beer, apple juice, lemonade, grape juice, orange juice, cranberry juice, lime and lemon juice.
Very dark purple indicates that the diluted sample concentration is greater than 500 mg/L. To obtain a more accurate concentration, the sample should be further diluted and retested. For example, if the sample was diluted 5×, try diluting 21×.
We offer exact volume transfer pipettes as an accessory. For samples requiring a 21× dilution, order the 20 µL transfer pipettes (TP20). For samples requiring a 5× dilution, order the 100 µL transfer pipettes (TP100).
Previously, we have tested the QQLLAC test strips with greek yoghurt and buttermilk. Since yoghurt is a solid sample, it cannot be diluted in the same way as liquids, so sample spoons with defined volumes were used to measure the amount of sample to dilute in water. If you have access to a scale, you can also weigh out your sample. Our yoghurt required a 5x dilution, but different samples may vary.
The color on the strip should be uniform. Sometimes the strip will not develop a uniform color if the sample is too acidic, and I suspect that this is your problem. In this case, you can either dilute your sample further than 5x, or if you have access to pH measuring equipment and a strong base like NaOH, you can adjust the pH of your sample to ~7 and rerun the sample.
Yes, unused reagents can be stored according to the assay protocol. The strips should be kept in a dry, cool location and protected from light.
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If you or your labs do not have the equipment or scientists necessary to run this assay, BioAssay Systems can perform the service for you.
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Please email or call 1-510-782-9988 x 2 to request assay service.
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Delivery: 2-5 days (US)
Storage: RT upon receipt
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