Biosensors and chemical sensors are essentialnto unlimited range of applications, includingnhealthcare: detection of biological, chemical,nand toxic agents: environmental monitoring;nagriculture and food analysis. This book, addressesnthe fundamental in development of biosensor andnchemical sensor which includes immobilization ofnbio or chemical markers, labelling strategies andnmodification of transducers (electrochemical andnoptical). This book also includes detail fabricationnand characterisation of immunosensor, DNAnbased biosensor. Food related sensors are alsonreviewed at the end of this book. Topics arencovered in a comprehensive fashion, with easynto follow presentation style for the benefit of thenreaders. This book can serve as a comprehensivenresource for biosensor and chemical sensor fornbeginners