The researchers tested honey, pancake and corn syrup, soy sauce, soy milk and tofu purchased in the Philadelphia, US metropolitan area.
Find the full published survey here
Samples of honey (sixty nine), pancake and corn syrup (twenty six), soy sauce (twenty eight), soy milk (eleven), and tofu (twenty) purchased in the Philadelphia, US metropolitan area in 2014 were analyzed for glyphosate residue using ELISA testing.
The minimum limit of quantification (LOQ) of the method were determined for honey, pancake syrup, and corn syrup to be 15 ppb; soy sauce, soy milk, and tofu 75 ppb. This means that even if the results were negative for some products they could have also contained glyphosate at levels under the minimum limit.
Glyphosate residues above the minimum limit of quantification were not found in pancake and corn syrup, soy milk, and tofu.