What is the byproduct of the synthesis of sucrose from the two monosaccharides glucose and fructose?

https://en.wikipedia.org/wiki/Disaccharide

note in that:

" ...... The joining of simple sugars into a double sugar happens by a condensation reaction, which involves the elimination of a water molecule from the functional groups only. ...."

The byproduct of the synthesis of sucrose from glucose and fructose is water (H2O). When glucose and fructose undergo a condensation reaction, their hydroxyl (-OH) groups combine, resulting in the formation of a glycosidic bond between them. As a result, a molecule of water is released as a byproduct. This process, known as dehydration synthesis or condensation reaction, is a common way for monosaccharides to form disaccharides like sucrose.