1H NMR study of amylose films plasticised by glycerol and water

Riitta Partanen, Vanessa Marie, William MacNaughtan, Pirkko Forssell (Corresponding Author), Imad Farhat

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

Amylose–glycerol films prepared by casting from solution were hydrated to different water contents. Wide-angle X-ray diffraction analysis suggested that the films were partially crystalline and contained the B polymorph. At a given hydration level, the presence of glycerol did not affect the extent of crystallinity or polymorphism of amylose. Proton NMR relaxometry was used to study the effects of water and glycerol on the molecular mobility of amylose. Spin–spin and spin-lattice relaxation parameters suggested a step change in the mobility of amylose when sufficient plasticiser, water and glycerol, was added to decrease the glass transition temperature (Tg) such that it became equal to or smaller than the observation temperature (T), i.e. (TTg)≥0. The mobility of amylose probed through the properties of the rapidly decaying component of the spin–spin relaxation varied with temperature in an identical fashion for films in the glassy state regardless of their composition. In the rubbery state, the mobility of amylose increased with increasing glycerol and water contents, i.e. with increasing (TTg). The mobility of amylose in the glassy state was best assessed through the spin-lattice relaxation times which suggested that at a given (TTg), the addition of glycerol leads to a decreased mobility probably through its well documented antiplasticising role. The findings were discussed in relation to documented changes in important physical properties of amylose films such as elongation and gas permeability.
Original languageEnglish
Pages (from-to)147 - 155
Number of pages9
JournalCarbohydrate Polymers
Volume56
Issue number2
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

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Amylose
Glycerol
Nuclear magnetic resonance
Water
Spin-lattice relaxation
Polymorphism
Water content
Gas permeability
Plasticizers
Hydration
Relaxation time
X ray diffraction analysis
Elongation
Protons
Casting
Physical properties
Crystalline materials
Temperature
Chemical analysis

Keywords

  • Amylose
  • Molecular mobility
  • NMR relaxation
  • Glass transition

Cite this

Partanen, R., Marie, V., MacNaughtan, W., Forssell, P., & Farhat, I. (2004). 1H NMR study of amylose films plasticised by glycerol and water. Carbohydrate Polymers, 56(2), 147 - 155. https://doi.org/10.1016/j.carbpol.2004.01.001
Partanen, Riitta ; Marie, Vanessa ; MacNaughtan, William ; Forssell, Pirkko ; Farhat, Imad. / 1H NMR study of amylose films plasticised by glycerol and water. In: Carbohydrate Polymers. 2004 ; Vol. 56, No. 2. pp. 147 - 155.
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Partanen, R, Marie, V, MacNaughtan, W, Forssell, P & Farhat, I 2004, '1H NMR study of amylose films plasticised by glycerol and water', Carbohydrate Polymers, vol. 56, no. 2, pp. 147 - 155. https://doi.org/10.1016/j.carbpol.2004.01.001

1H NMR study of amylose films plasticised by glycerol and water. / Partanen, Riitta; Marie, Vanessa; MacNaughtan, William; Forssell, Pirkko (Corresponding Author); Farhat, Imad.

In: Carbohydrate Polymers, Vol. 56, No. 2, 2004, p. 147 - 155.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - 1H NMR study of amylose films plasticised by glycerol and water

AU - Partanen, Riitta

AU - Marie, Vanessa

AU - MacNaughtan, William

AU - Forssell, Pirkko

AU - Farhat, Imad

PY - 2004

Y1 - 2004

N2 - Amylose–glycerol films prepared by casting from solution were hydrated to different water contents. Wide-angle X-ray diffraction analysis suggested that the films were partially crystalline and contained the B polymorph. At a given hydration level, the presence of glycerol did not affect the extent of crystallinity or polymorphism of amylose. Proton NMR relaxometry was used to study the effects of water and glycerol on the molecular mobility of amylose. Spin–spin and spin-lattice relaxation parameters suggested a step change in the mobility of amylose when sufficient plasticiser, water and glycerol, was added to decrease the glass transition temperature (Tg) such that it became equal to or smaller than the observation temperature (T), i.e. (T−Tg)≥0. The mobility of amylose probed through the properties of the rapidly decaying component of the spin–spin relaxation varied with temperature in an identical fashion for films in the glassy state regardless of their composition. In the rubbery state, the mobility of amylose increased with increasing glycerol and water contents, i.e. with increasing (T−Tg). The mobility of amylose in the glassy state was best assessed through the spin-lattice relaxation times which suggested that at a given (T−Tg), the addition of glycerol leads to a decreased mobility probably through its well documented antiplasticising role. The findings were discussed in relation to documented changes in important physical properties of amylose films such as elongation and gas permeability.

AB - Amylose–glycerol films prepared by casting from solution were hydrated to different water contents. Wide-angle X-ray diffraction analysis suggested that the films were partially crystalline and contained the B polymorph. At a given hydration level, the presence of glycerol did not affect the extent of crystallinity or polymorphism of amylose. Proton NMR relaxometry was used to study the effects of water and glycerol on the molecular mobility of amylose. Spin–spin and spin-lattice relaxation parameters suggested a step change in the mobility of amylose when sufficient plasticiser, water and glycerol, was added to decrease the glass transition temperature (Tg) such that it became equal to or smaller than the observation temperature (T), i.e. (T−Tg)≥0. The mobility of amylose probed through the properties of the rapidly decaying component of the spin–spin relaxation varied with temperature in an identical fashion for films in the glassy state regardless of their composition. In the rubbery state, the mobility of amylose increased with increasing glycerol and water contents, i.e. with increasing (T−Tg). The mobility of amylose in the glassy state was best assessed through the spin-lattice relaxation times which suggested that at a given (T−Tg), the addition of glycerol leads to a decreased mobility probably through its well documented antiplasticising role. The findings were discussed in relation to documented changes in important physical properties of amylose films such as elongation and gas permeability.

KW - Amylose

KW - Molecular mobility

KW - NMR relaxation

KW - Glass transition

U2 - 10.1016/j.carbpol.2004.01.001

DO - 10.1016/j.carbpol.2004.01.001

M3 - Article

VL - 56

SP - 147

EP - 155

JO - Carbohydrate Polymers

JF - Carbohydrate Polymers

SN - 0144-8617

IS - 2

ER -