Normally chitosan is insoluble in water, but soluble in some aqueous acidic solutions. The most widespread solvent to dissolve chitosan is 1% acetic acid (as a reference) at a pH near 4. 
Ag NP suspensions were synthesized from silvercontaining glass powder (BSP21, silver content 1 wt%) and glucose aqueous solution. Chitosan solution (10 mg/mL) was prepared by mixing 0.1 g chitosan. Chitosan solution (100 μL, 10 mg/mL) was mixed with Ag NP solution. 

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