Trehalulose
Template:Distinguish Template:Chembox Trehalulose is a disaccharide made up of a molecule of fructose bound to a molecule of glucose. Like isomaltulose, it is a structural isomer of sucrose that is present in small quantities in honey.[1] It makes up 50% of sugars in the honeydew of silverleaf whiteflies[2][3] and is synthesised from sucrose by some bacteria,[4][5] such as Protaminombacter rubrum.[6][1] Because the anomeric carbon of the fructose moiety is not involved in the glycosidic bond, it is a reducing sugar.[6]
Physiology
Because the fructose and glucose molecules are linked by a 1,1 glycosidic bond, which is more stable than the 1,2 glycosidic bond in sucrose, it is broken down more slowly than sucrose in the small intestine, giving it a lower glycemic index.[6] This more stable bond also means that it cannot be utilised by Streptococcus mutans, and it is therefore non-cariogenic.[7]
Properties
Unlike isomaltulose, trehalulose strongly resists crystallisation, and forms an amorphous solid when dried. Its sweetness relative to sucrose has been estimated as between 0.4[8] and 0.7.[9]
It has a specific rotation of °.[1]
Honey from stingless bees
In 2020 researchers at the University of Queensland found that some species of stingless bee in Australia, Malaysia, and Brazil produce honey containing between 13% and 44% trehalulose rather than the usual glucose and fructose. The university's findings supported the long-standing claims of Indigenous Australian people that native honey is beneficial for human health.[10][11] In 2021 the same researchers discovered that the bees convert all sucrose from nectar into trehalulose.[12]