Application of the Williams–Landel–Ferry model to the viscosity–temperature relationship of Australian honeys

The rheological behaviour of nine unprocessed Australian honeys was investigated for the applicability of the Williams-Landel-Ferry (WLF) model. The viscosity of the honeys was obtained over a range of shear rates (0.01-40 s(-1)) from 2degrees to 40 degreesC, and all the honeys exhibited Newtonian behaviour with viscosity reducing as the temperature was increased. The honeys with high moisture were of lower viscosity, The glass transition temperatures of the honeys, as measured with a differential scanning calorimeter (DSC), ranged from -40degrees to -46 degreesC, and four models (WLF. Arrhenius, Vogel-Tammann-Fulcher (VTF), and power-law) were investigated to describe the temperature dependence of the viscosity. The WLF was the most suitable and the correlation coefficient averaged 0.999 +/- 0.0013 as against 0.996 +/- 0.0042 for the Arrhenius model while the mean relative deviation modulus was 0-12% for the WLF model and 10-40% for the Arrhenius one. With the universal values for the WLF constants, the temperature dependence of the viscosity was badly predicted. From non-linear regression analysis, the constants of the WLF models for the honeys were obtained (C-1 = 13.7-21.1: C-2 = 55.9-118.7) and are different from the universal values. These WLF constants will be valuable for adequate modeling of the rheology of the honeys, and they can be used to assess the temperature sensitivity of the honeys. (C) 2002 Elsevier Science Ltd. All rights reserved.

[1]  An-I Yeh,et al.  Expansion of Rice Pellets: Examination of Glass Transition and Expansion Temperature , 2000 .

[2]  Chris D. Rielly,et al.  Chemical Engineering for the Food Industry , 1991 .

[3]  B. Bhandari,et al.  Glass transition in Australian honeys , 2001 .

[4]  J. Baust,et al.  Investigation of vitrification by nuclear magnetic resonance and differential scanning calorimetry in honey: a model carbohydrate system , 1990 .

[5]  P. Lillford,et al.  The glassy state in foods , 1993 .

[6]  M. Peleg.  On the use of the WLF model in polymers and foods. , 1992, Critical reviews in food science and nutrition.

[7]  James Freeman Steffe,et al.  Rheological Methods in Food Process Engineering , 1992 .

[8]  C. E. Lupano.  DSC study of honey granulation stored at various temperatures , 1997 .

[9]  Y. Roos.  Phase Transitions in Foods , 1995 .

[10]  E. Crane.  Honey. A comprehensive survey , 1978, Medical History.

[11]  J. Changying,et al.  General rheological model for natural honeys in China , 1998 .

[12]  John R. Mitchell,et al.  The effect of sugars on the extrusion of maize grits: I. The role of the glass transition in determining product density and shape , 1996 .

[13]  C. C. Seow,et al.  Plasticizing-Antiplasticizing Effects of Water on Physical Properties of Tapioca Starch Films in the Glassy State , 2000 .

[14]  Theodore P. Labuza,et al.  Evaluation of food moisture sorption isotherm equations part I: Fruit, vegetable and meat products , 1985 .

[15]  J. Thoen,et al.  Glass transition temperature of honey as a function of water content as determined by differential scanning calorimetry. , 1999, Journal of agricultural and food chemistry.

[16]  S. Ring,et al.  KINETIC ASPECTS OF THE GLASS-TRANSITION BEHAVIOUR OF MALTOSE-WATER MIXTURES , 1991 .

[17]  S. Debon,et al.  Annealing of maize starch , 2000 .

[18]  Paul Chen,et al.  Pulse NMR study of glass transition in maltodextrin , 1999 .

[19]  R. Landel,et al.  The Temperature Dependence of Relaxation Mechanisms in Amorphous Polymers and Other Glass-Forming Liquids , 1955 .

[20]  Christopher W. Macosko,et al.  Rheology: Principles, Measurements, and Applications , 1994 .

[21]  L. Slade,et al.  Beyond water activity: recent advances based on an alternative approach to the assessment of food quality and safety. , 1991, Critical reviews in food science and nutrition.

[22]  Michael C. Williams,et al.  Volumetric interpretation of viscosity for concentrated and dilute sugar solutions , 1981 .

[23]  M. Peleg.  Glass transition and the physical stability of food powders , 1993 .

[24]  J. Ferry.  Viscoelastic properties of polymers , 1961 .

[25]  J. Chirife,et al.  Water activity, water glass dynamics, and the control of microbiological growth in foods. , 1996, Critical reviews in food science and nutrition.

[26]  M. Peleg.  On modeling changes in food and biosolids at and around their glass transition temperature range. , 1996, Critical reviews in food science and nutrition.

[27]  B. Bhandari,et al.  Rheology of selected Australian honeys , 1999 .

[28]  B. Bhandari,et al.  Rheology and crystallization kinetics of honey: Present status , 1999 .

[29]  Rosana G. Moreira,et al.  Moisture desorption model for nonpareil almonds , 1989 .

[30]  B. Cuq,et al.  Characterisation of Glass Transition of Durum Wheat Semolina using Modulated Differential Scanning Calorimetry , 2001 .

[31]  P. Sopade.  CRITERIA FOR AN APPROPRIATE SORPTION MODEL BASED ON STATISTICAL ANALYSIS , 2001 .

[32]  B. Bhandari,et al.  Use of an Arrhenius Model to Predict Rheological Behaviour in some Australian Honeys , 2000 .

[33]  P. Sporns,et al.  Crystal Control In Processed Liquid Honey , 1991 .

[34]  R. Parker,et al.  THE VISCOSITY OF SUPERCOOLED FRUCTOSE AND ITS GLASS TRANSITION TEMPERATURE , 1990 .

[35]  V. Y. Grinberg,et al.  The plasticizing effect of water on proteins, polysaccharides and their mixtures. Glassy state of biopolymers, food and seeds , 2000 .