This work presents the synthesis and characterization of biopolymer pectin-based polymer electrolyte. Proton conducting polymer electrolytes consisting of pectin as host polymer and ammonium nitrate (NH4NO3) as complexing salt in different compositions have been prepared by solution casting technique using distilled water as solvent and characterized by FTIR, AC impedance spectroscopy and UV-Visible spectral analyses. The FTIR analysis reveals complexation behaviour of the electrolytes. The

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... c conductivity of pure pectin is found to be 5.15×10-9 S cm-1 at ambient temperature. The highest conductivity of 6.64×10-5 S cm-1 has been obtained for the polymer electrolyte with 70 mol% pectin and 30 mol% NH4NO3 at ambient temperature. The conductivity of the electrolyte increases with increasing temperature for all compositions. UV-Visible analysis indicates that the bandgap energy decreases with the addition of NH4NO3.