Stachyose are non-reducing sugar. Non-reducing sugar does not reduce Fehling's solution and Tollens reagent.

What type of sugar is Stachyose?

Stachyose is a tetrasaccharide consisting of sucrose having an alpha-D-galactosyl-(1->6)-alpha-D-galactosyl moiety attached at the 6-position of the glucose. It has a role as a plant metabolite and a mouse metabolite. It is a raffinose family oligosaccharide and a tetrasaccharide.

Is sorbitol a non-reducing sugar?

Alditols and polyols, from other sugars, are sweet materials and sorbitol, xylitol, mannitol, maltitol, lactitol and isomalt are used commercially in food. These substances are also known as sugar alcohols, they are not reducing sugars and do not contribute to the Maillard reaction.