Fig. (1) UV-Visible spectra of SNPs samples at different plant extract (A) A1, (B) A2, (C) A3, (D) A4; UV-Visible spectra of SNPs samples at substrate concentration (E) 1mM (F) 2mM (G) 3mM; UV-Visible spectra of SNPs samples at different temperature (H) 30 °C (I) 40 °C (J) 50 °C (K) 60 °C and (L) 70 °C Labels in figure A, B, C, D, E and F indicates absorption spectra at different time intervals i.e. 0 min, 1/2, 1 , 2 , 4 , 24 Hrs respectively.