A coloring composition containing a dis-azo compound or poly-azo compound which contains two or more substituents having a pKa value in water of -i0 to 5 and which has an oxidation potential more positive than 0.8 V (vs SCE), and an inkjet recording ink composition containing the coloring composition and an inkjet recording method wherein an image is formed on an image-receiving material containing a support having provided thereon an ink receiving layer containing a white inorganic pigment particle, using the inkjet recording ink composition.

 
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> Use of microfluidic systems in the electrochemical detection of target analytes

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