Psicose

D-Psicose (C6H12O6), also known as D-allulose, or simply allulose, is a low-calorie epimer of the monosaccharide sugar fructose, used by some major commercial food and beverage manufacturers as a low-calorie sweetener. First identified in wheat in the 1940s, allulose is naturally present in small quantities in certain foods.

Psicose
Names
IUPAC name
Psicose
Systematic IUPAC name
(3R,4R,5R)-1,3,4,5,6-Pentahydroxyhexan-2-one
Other names
D-Allulose; D-Psicose; D-Ribo-2-hexulose; Pseudofructose
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.008.182
MeSH psicose
UNII
  • InChI=1S/C6H12O6/c7-1-3(9)5(11)6(12)4(10)2-8/h3,5-9,11-12H,1-2H2/t3-,5-,6+/m1/s1 Y
    Key: BJHIKXHVCXFQLS-PUFIMZNGSA-N Y
  • InChI=1/C6H12O6/c7-1-3(9)5(11)6(12)4(10)2-8/h3,5-9,11-12H,1-2H2/t3-,5-,6+/m1/s1
    Key: BJHIKXHVCXFQLS-PUFIMZNGBH
  • O=C([C@H](O)[C@H](O)[C@H](O)CO)CO
Properties
C6H12O6
Molar mass 180.156 g·mol−1
Melting point 58 °C (136 °F; 331 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

The U.S. Food and Drug Administration (FDA) has accepted a petition for Generally Recognized As Safe (GRAS) for allulose as a sugar substitute in various specified food categories. Because it is absorbed and metabolized differently from other sugars, the FDA has exempted allulose from the listing of total and added sugars on the Nutrition and Supplement Facts labels, but requires its weight listing as a carbohydrate, with 0.4 kcal/g (about 1/10 the calories of ordinary carbohydrates).

Studies have shown the commercial product is not absorbed in the human body the way common sugars are and does not raise insulin levels, but more testing may be needed to evaluate any other potential side effects. In 2020, the U.S. FDA accepted the conclusion by Samyang that the maximum tolerable consumption for a 60 kg adult was 33 to 36 grams per day.

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