Verification of fructose as hydroxymethylfurfural



resorcin GSGESUND.gif (476 Byte) Xn  GSUMWELT.gif (758 Byte) N    R 22-36/38-50     S (2)-26-61

hydrochloric acid 30-33%  GSATZEND.gif (935 Byte) C    R 34-37     S (1/2)-26-45

Instead of resorcin one can also use 1-naphthol (see literature).

Equipment needed

test tube
burner (preferably alcohol)

Test procedure


The diluted residue can be discharged into the drainage.


Due to the seperation of water fructose 5 -(hydroxymethyl)furfural is formed. This reacts with resorcin along with a renewed seperation of water to form the colorant shown below, as well as isomers of this. The formation of furfural derivates, upon which this verification is based, succeeds under these conditions only with certain ketoses.

fructosen.gif (1713 Byte)


DSCN0434.JPG (176013 Byte)

Verification of fructose


Derived from p. 203, [4]

Concerning the use of 1-naphthol as a detection agent: to be added, [3]