6 amino 1 3 dimethyluracil

Cs (1.0–3.0 × 10⁵ g mol⁻¹ molecular weight and 98% degree of deacetylation) was made from the shell of shrimps and crabs Pandalus borealis and purchased from Acros Organics (USA). ZnONPs (product No. NCZ4701, powder, and 20 nm particle size) were supplied by nanochemazone (Canada). Epichlorohydrin was obtained from PanReac. AppliChem-ITW Reagent (USA). 6-Amino-1,3-dimethyluracil, benzaldehyde, 2-chlorobenzaldehyde, 4-chlorobenzaldehyde, 2-methoxybenzaldehyde, formaldehyde, and 2-nitrobenzaldehyde were purchased from Sigma-Aldrich (Germany). XTT (2, 3-bis [2-methyloxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide) was obtained from Sigma (St. Louis, MO, USA).

Chitosan (1.0–3.0 × 10⁵ g mol ⁻¹ and 98% deacetylation degree) was obtained from (Morris Plains, NJ, USA). Benzaldehyde and epichlorohydrin were purchased from PanReac. AppliChem-ITW Reagent (Darmstadt, Germany). 6-Amino-1,3-dimethyl uracil was supplied by Sigma-Aldrich (Munich, Germany). Congo red dye (CR) dye (Figure 1) was supplied by Winlab (Leicestershire, UK). The other chemicals and solvents were obtained from Sigma-Aldrich (Munich, Germany).