Chromotropic Acid Detection Of Corn Gluten Meal

- Jul 18, 2018-

Protein sperm (urea-formaldehyde polymers) are decomposed to produce formaldehyde under the action of sulfuric acid, and formaldehyde and chromotropic acid produce a purple substance. Starch, protein, sugar and ammonium do not interfere with this reaction. Take 0.1-0.2g samples in a dry 50ml beaker, add about 1ml chromotropic acid (1g/l concentrated sulfuric acid solution), in the electric stove carefully micro-heat to just produce micro-smoke, remove the beaker, add 10ml water, if the solution turns purple, then the sample contains protein essence, is a fake and inferior product.