“…The first analytical PEDDs have been developed for photometric measurements as dedicated, economic, and miniaturized optoelectronic devices useful for conventional measurement with the use of cuvettes as well as for the use in flow analysis format (dedicated flow-through detectors for flow injection analysis (FIA), SIA, MCFA, and HPLC). Such photometric devices have been successfully applied for determination of selected metal ions [ 1 – 9 ], ammonia [ 10 ], inorganic anions [ 11 – 15 ], total organics [ 16 ], quinine [ 17 ], hemoglobin [ 18 ], creatinine [ 19 ], and proteins [ 20 ] as well as for enzyme activity assays [ 21 – 23 ]. Only recently, Nwankire et al [ 24 ] have reported on PEDD-based microfluidic analysis system allowing blood assay of five analytes important for liver diagnostics (albumin, total and direct bilirubin, alkaline phosphatase, and γ-glutaral transferase).…”