Okay heres my problem. I cannot find this procedure online, can someone please help me?
Confirmatory Test for Chitosan Reagents and materials: Iodine/Potassium iodide (0.2 g iodine are added to 100 ml of a potassium iodide solution, w(KI) = 5%) and sulfuric acid = 1%
Small amount of chitosan powder was dissolved in water using a test tube. Distilled water was placed in half of another test tube. Then mix the dissolved chitosan solution in the distilled water test tube. 2-3 drops of Iodine/Potassium iodide was added. The mixture was then acidified with 3-6 drops of sulfuric acid. The solution was mixed using a stirring rod. After the addition of Iodine/Potassium iodide, the precipitate turned dark brown. On the addition of sulfuric acid, the dark brown color turned to dark purple. This indicates the presence of chitosan (Lande et al., 2015).