Carboxymethyl modification of konjac glucomannan affects water binding properties

Carbohydr Polym. 2015 Oct 5:130:1-8. doi: 10.1016/j.carbpol.2015.05.001. Epub 2015 May 11.

Abstract

The water binding properties of konjac glucomannan (KGM) and carboxymethyl konjac glucomannan (CMKGM) are important for their application in food, pharmaceutical, and chemical engineering fields. The equilibrium moisture content of CMKGM was lower than that of KGM at the relative humidity in the range 30-95% at 25°C. The water absorption and solubility of CMKGM in water solution were lower than that of KGM at 25°C. Carboxymethyl modification of KGM reduces the water adsorption, absorption, and solubility. Both carboxymethylation and deacetylation could confer hydrophobicity for CMKGM. These data provide the basis for expanding CMKGM application.

Keywords: Carboxymethyl konjac glucomannan; Konjac glucomannan; Water adsorption; Water binding; Water solubility.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylation
  • Adsorption
  • Hydrophobic and Hydrophilic Interactions
  • Mannans / chemistry*
  • Mannans / metabolism*
  • Solubility
  • Water / metabolism
  • X-Ray Diffraction

Substances

  • Mannans
  • carboxymethyl konjac glucomannan
  • Water
  • (1-6)-alpha-glucomannan