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Comparison of rheological models for determining dark chocolate viscosity

Afoakwa, Emmanuel Ohene and Paterson, Alistair and Fowler, Mark and Vieira, Joselio (2008) Comparison of rheological models for determining dark chocolate viscosity. International Journal of Food Science and Technology, 44 (1). pp. 162-167. ISSN 0950-5423

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Abstract

Parameters in chocolate rheology, namely shear viscosity and yield stress, are important in manufacture and directly influenced by product particle size distribution (PSD) and composition. The Casson model was the standard confectionery industry strategy to quantify rheological properties of molten chocolate until in 2000, the International Confectionery Association recommended the use of interpolation data to describe viscosity. The two strategies are compared and correlated in defining rheological properties of molten dark chocolates prepared using different PSD, fat and lecithin content. Rheological parameters were determined using a shear rate-controlled rheometer and data examined using correlation, regression and principal component analyses to establish their inter-relationships. Correlation and regression analyses showed high correlation (r = 0.89-1.00) and regression coefficients (R2 = 0.84-1.00). The newer International Confectionery Association technique gave higher correlation and regression coefficients than the Casson model, but multivariate principal component analysis showed that the two models were highly related and either could effectively quantify dark chocolate viscosity parameters.

Item type: Article
ID code: 16013
Keywords: chocolate composition, particle size distribution, shear viscosity, yield stress, Therapeutics. Pharmacology, Pharmacy and materia medica, Microbiology, Food Science, Industrial and Manufacturing Engineering
Subjects: Medicine > Therapeutics. Pharmacology
Medicine > Pharmacy and materia medica
Science > Microbiology
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Related URLs:
    Depositing user: Ms Ann Barker-Myles
    Date Deposited: 03 Feb 2010 10:07
    Last modified: 05 Sep 2014 02:29
    URI: http://strathprints.strath.ac.uk/id/eprint/16013

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