Maltose

Maltose

α-Maltose

β-Maltose
Names
IUPAC name
4-O-α-D-Glucopyranosyl-D-glucose
Systematic IUPAC name
(3R,4R,5S,6R)-6-(hydroxymethyl)-5-{[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}oxane-2,3,4-triol
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.000.651
EC Number
  • 200-716-5
KEGG
UNII
  • InChI=1S/C12H22O11/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17/h3-20H,1-2H2/t3-,4-,5-,6+,7-,8-,9-,10-,11?,12-/m1/s1 Y
    Key: GUBGYTABKSRVRQ-PICCSMPSSA-N Y
  • InChI=1S/C12H22O11/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17/h3-20H,1-2H2/t3-,4-,5-,6+,7-,8-,9-,10-,11?,12-/m1/s1
  • Key: GUBGYTABKSRVRQ-PICCSMPSSA-N
  • O([C@H]1[C@H](O)[C@@H](O)C(O)O[C@@H]1CO)[C@H]2O[C@@H]([C@@H](O)[C@H](O)[C@H]2O)CO
Properties
C12H22O11
Molar mass 342.297 g·mol−1
Appearance White powder or crystals
Density 1.54 g/cm3
Melting point 160 to 165 °C (320 to 329 °F; 433 to 438 K) (anhydrous)
102–103 °C (monohydrate)
1.080 g/mL (20 °C)
+140.7° (H2O, c = 10)
Hazards
Safety data sheet (SDS) External MSDS
Related compounds
Related
Sucrose
Lactose
Trehalose
Cellobiose
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

Maltose (/ˈmɔːltoʊs/ or /ˈmɔːltoʊz/), also known as maltobiose or malt sugar, is a disaccharide formed from two units of glucose joined with an α(1→4) bond. In the isomer isomaltose, the two glucose molecules are joined with an α(1→6) bond. Maltose is the two-unit member of the amylose homologous series, the key structural motif of starch. When beta-amylase breaks down starch, it removes two glucose units at a time, producing maltose. An example of this reaction is found in germinating seeds, which is why it was named after malt. Unlike sucrose, it is a reducing sugar.

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