Designing and application of test strip for fast detecting nitrate in food
Test strip for fast detecting nitrate in food was designed and applied in several vegetables. With 4.5% N-1-naphthylethylenediamin dihydrochloride, 7.5% sulfanilic acid and 15% tartaric acid mixed by the volume 1∶1∶1 as the color-developing reagent, the qualitative filter paper used for the test strip carrier and zinc powder used for the reducer, the test strip was made successfully and used to detect nitrate levels in several vegetables compared with state standard method. The result indicated that the color-developing reagent and zinc powder could react to and fast detect nitrate. The designed test strip could detect the nitrate in food faster and had higher precision and sensitivity, smaller volume and lower cost, therefore would have huge potential for development.