Described here is a test strip for detection of melamine, comprising: a support configured for capillary flow of a fluid sample from a first end of the support to a second end of the support that is downstream from the first end; a conjugation pad disposed adjacent to the first end of the support and including nanoparticles configured for suspension in the sample flowing past the conjugation pad, the nanoparticles configured to produce a colorimetric effect when exposed to melamine; and a test portion downstream of the conjugation pad and including a molecular recognition agent immobilized on the support and having an affinity for melamine.
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