Dry Chemical Test Kits

Dry Chemical Colorimetric Assay

Dry Chemical Colorimetric Assay, based on Enzyme Reaction Chemistry colorimetric principle, are chemical testing process, which is different from the immuno interaction between antigen and antibody.

During the test, the fixed chemical reagents will solve into the liquid specimen, which will react specifically with the target analyte of the test kit. The newly developed compound then causes a visually detectable color change in the test pad. The different concentration of the analyte in the liquid specimen causes different degree of color changes. By comparing the resulting colors with the standard color chart attached to the test kit, the concentration of the target analyte can be estimated.

This technique is widely used in medical diagnostics, and urine reagent strip is one typical application. In the urine test strips, certain quantities of different chemical reagent(s) are fixed in up to 14 pads along a plastic back lining. The color changes can also be read with urine analyzer, an instrument which actually is a reflectance photometer that analyzes areas on the urine strip and displays the results in clinically meaningful units. The other common application of chemical colorimetric assay is alcohol test strip.