Abstract
Recently, gold nanoparticles have been widely used as a good labeling substance. Subsequently, increasing concern has been paid to immunogold labeling technique because it is simple, highly sensitive, and rapid to perform in immunoassay. This paper discusses the basic principle, preparation methods, and recent developments of immunogold labeling technique. In addition, the new application and prospects of immunogold labeling technique in compost detection were proposed based on the application in immunoassay and environmental determination.