Schiff Bases of Istain: Antiglycation Activity

Schiff bases of isatin 1-20 were synthesized and tested for their antiglycation potential. Compound 6 showed 77% inhibition with an IC50= 177.2 ± 0.4 μM, which is an excellent antiglycation activity, if compared with standard aminoguanidine having 85.69% inhibition with an IC50 value 268.7 ± 12.4 μM. Compound 3 showed 71.3% inhibition with an IC50 = 675 ± 0.12 μ/M, which is moderately active antiglycation agent. Although compounds 1, 2, 5, 7-15, and 17- 19 demonstrated over 50% inhibition in preliminary screening, but found inactive when further evaluated for their IC50 values. However, compounds 4, 16, 20, and parent isatin showed less than 50% inhibition and considered to be completely inactive. The structures of all the synthesized compounds were determined by spectroscopic analysis, including UV, IR, mass and 1H-NMR spectrometry. All compounds gave satisfactory elemental analysis.