Journal of the American Oil Chemists' Society

, Volume 87, Issue 2, pp 133–145 | Cite as

Effect of Cooling Rate on the Structural and Moisture Barrier Properties of High and Low Melting Point Fats

  • Claire Bourlieu
  • Valérie Guillard
  • Mariana Ferreira
  • Hugh Powell
  • Baltasar Vallès-Pàmies
  • Stéphane Guilbert
  • Nathalie Gontard
Original Paper

Abstract

The effect of three cooling rates (rapid, intermediate and slow CR) on the moisture barrier properties and on the physical state of acetylated and high melting point hydrophobic self-supported moisture barriers has been investigated. The selected CR were representative of industrial processing conditions and the selected barrier materials of common effective GRAS substances (acetomonopalmitin, white beeswax, two commercial blends of beeswax and acetylated glycerides and a blend of palmitic/stearic acids). Variations of CR affected crystallisation kinetics, SFC in an extend depending on the fat chemical composition and degree of undercooling, crystal size and ratio of polymorphs present in the materials. It did not have major influence on the contact angles with water measured at the surface of the materials and on the mass–volume area properties of the material. The resultant effect on the macroscopic moisture barrier properties of the materials were evaluated using water vapour permeability (WVP) measurements. The CR had no significant effect on the WVP, except for one blend of acetylated fat and beeswax for which a slow CR may have favoured the healing of imperfections. The variations of WVP between all materials and CRs were mainly attributed to variation in materials polarity using multivariable analysis.

Keywords

Lipid barriers Water vapour permeability Cooling rate X-ray diffraction Solid fat content Mass–volume area related properties 

Abbreviations

AMP

Acetomonopalmitin

CR

Cooling rate

dapp

Apparent density

dtrue

True density

GRAS

Generally recognised as safe

MP

Melting point

P/S

Palmitic/stearic acid blend

RH

Relative humidity

SEM

Scanning electron microscopy

SFC

Solid fat content

W/A

Wax/acetic acid ester of mono and diglycerides

WVP

Water vapour permeability

XRD

X-ray diffraction

List of symbols

A

Area of exposed film

α, β′, β

Hexagonal, orthorhombic and triclinic subcell lateral packings

d

Interplanar crystal lattice distance

Δs

Slope of water weight versus time

e

The film thickness

ε

Porosity

k

Avrami constant

M

Molecular mass of water

n

Avrami exponent or index of crystallisation

p°

the saturating water vapour pressure of water at constant considered temperature

aw

Water activity

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Copyright information

© AOCS 2009

Authors and Affiliations

  • Claire Bourlieu
    • 1
    • 4
  • Valérie Guillard
    • 1
    • 5
  • Mariana Ferreira
    • 1
  • Hugh Powell
    • 2
  • Baltasar Vallès-Pàmies
    • 3
  • Stéphane Guilbert
    • 1
  • Nathalie Gontard
    • 1
  1. 1.UMR 1208 Ingénierie des Agropolymères et Technologies Emergentes, CIRAD, INRA, Montpellier SupAgro, Université Montpellier 2MontpellierFrance
  2. 2.Science GroupNestlé Product Technology Centre,York (Nestec York Ltd)YorkUK
  3. 3.Liquid ProductsNestlé Research CenterLausanneSwitzerland
  4. 4.UMR 1253 STLORennesFrance
  5. 5.UMR IATE, Université de Montpellier II, Bat 15. 4° étage CC 023Cedex 05 MontpellierFrance

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