Seliwanoff’s test is used to differentiate between keto sugar and aldo sugar. PRINCIPLE: Carbohydrates are converted to furfural derivatives by dilute HCl. Only furfural derivatives of keto-hexoses condense with Resorcinol to form a cherry red complex. This test is positive for sugar (Keto) when it gives cherry red colour complex. REAGENTS: 1. Seliwanoff’s Reagent: i. … [Read more...]