Hydrogen bonding in maltooligomer-glycerol-water matrices: Relation to physical state and molecular free volume

Mina Roussenova, Jean Christophe Andrieux, M. Ashraf Alam, Job Ubbink

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We use Fourier Transform Infra Red (FTIR) Spectroscopy to explore the effects of water and glycerol on the hydrogen bonding of low water content maltooligomer matrices by monitoring the shifts in the position of the peak associated with the fundamental stretching vibration of the hydroxyl groups, νOH. Changes in hydrogen bonding are investigated in relation to the physical state and the molecular packing of the maltooligomer matrices, which are measured by Positron Annihilation Lifetime Spectroscopy (PALS). In the concentration range studied (0-20 wt.%), glycerol acts as an anti-plasticizer whereby it reduces the average molecular hole size, vh, while modulating the hydrogen bond network of the carbohydrate matrices. Depending on the level of hydration, water can cause anti-plasticization or plasticization of the maltooligomer-glycerol matrices. For water contents below ∼5 wt.%, water acts as an anti-plasticizer, whereby it reduces vh and we measure a reduction νOH. At higher water contents, water acts as a plasticizer, causing a systematic increase in vh, while νOH continues to decrease as a function of increasing water content.

Original languageEnglish (US)
Pages (from-to)566-575
Number of pages10
JournalCarbohydrate Polymers
Volume102
Issue number1
DOIs
StatePublished - Feb 15 2014
Externally publishedYes

Keywords

  • Anti-plasticization
  • Hydrogen bonding
  • Maltooligomers
  • Molecular packing
  • Plasticization
  • Positron annihilation

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