PRINCIPLE
Residual sugars in the solution discolor the Fehling liquor at boiling point. The Fehling liquor is titrated in a manner that 10ml are discolored by 0.05g of invert sugar (glucose and fructose).
The Fehling method provides an easy and economical solution to accurately determine the quantity of residual sugar in wines. This kit includes a system to immediately reduce the sample to a colorless compound with a syringe and a hotplate stirrer. The heating time (after pre-heating) is about 3 minutes.