CHAPTER 16: Unit 3.Carbohydrates Physical Properties

Carbohydrates Physical Properties

Monosaccharides

D-Monosaccharides Texture/Color Freezing Point in oC Boiling Point in oC Density
In g/mL
Solubility
D – Galactose White Powder 168 – 170 Decomposes 1.50 Soluble in Water and Pyridine
D – Glucose White Powder 148 Decomposes 1.54 Water soluble
D – Fructose White Powder 119 – 122 Decomposes 1.60 Water soluble

Disaccharides

Disaccharides Texture/Color Freezing Point in oC Boiling Point in oC Density
In g/mL
Solubility
D- Maltose White Powder 160 – 165 Decomposes 1.54 Water-soluble
D – Lactose White Powder 252 (anhydrous) Decomposes 1.525 Water-soluble
Sucrose White Powder Decomposes at
186
Decomposes 1.587 Water-soluble

Polysaccharides

Disaccharides Texture/Color Freezing Point in oC Boiling Point in oC Density
In g/mL
Solubility
Starch: Amylose White Powder 150 then Decomposes Decomposes 1.54 Hot Water insoluble
Starch: Amylopectin White Powder Decomposes Decomposes 1.25 Hot Water soluble
Glycogen White Powder >300 Decomposes >1.0 Water and Slightly in Alcohol
Cellulose White Powder 260–270 then Decomposes Decomposes 1.50 Water-insoluble

Monosaccharides

D-Monosaccharides Molecular Formula Molar Mass in g/mol
D – Galactose C6H12O6 180.16 g/mol
D – Glucose C6H12O6 180.16 g/mol
D – Fructose C6H12O6 180.16 g/mol

Disaccharides

Disaccharides Molecular Formula Molar Mass in g/mol
D- Maltose C12H22O11 342.3 g/mol
D – Lactose C12H22O11 342.3 g/mol
Sucrose C12H22O11 342.3 g/mol

Polysaccharides

Disaccharides Molecular Formula Molar Mass in g/mol
Starch: Amylose C14H26O11 370.35 g/mol
Starch: Amylopectin C30H52O26 828.7 g/mol
Glycogen ‎C24H42O21 666.58 g/mol
Cellulose (C6H10O5)n 162.14 g/mol per glucose unit