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Colorimetric sensing of bisulphate ion (HSO3-) by calix[4]-conjugate protected Ag-nanoparticles

 

This invention relates to a method of detecting the presence of bisulfite ions in a sample.  A solution containing silver nanoparticles coated in a conjugate of diamine tetra sulphonato calix[4]arene changes its colour from orange yellow to bright orange red immediately in the presence of HSO3- ions

Indian patent application no. 1089/MUM/2011

Inventors: C P Rao, Amitabha Acharya