The monitoring of insulin is of great relevance for the management of diabetes, the detection of pancreatic islet-cell malfunction, the definition of hypoglycemia, and the diagnosis of insulinoma.
Radioimmunoassay (RIA) and enzyme-linked immunosorbent assay (ELISA) are the two conventional methods for determining insulin. However, these methods needed long procedure, specific machine for determination. The objective of this study is to develop an immunochromatographic strip for insulin using anti-insulin polyclonal antibodies (pAbs). This self-assembled immunochromatographic strip was convenient, rapid, low price and no machine needed in clinical diagnosis. The colloidal gold was made from the chloroauric acid ( HAuCl4 ) and labeled anti-insulin pAbs with 25 nm of colloidal gold. This insulin immunochromatographic strip prepared could determine for 0.01-100 µg/mL of insulin and no cross-reaction. Moreover, this strip could be applied to determine mouse serum samples, and the detection time was approximately 3-5 min.
