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Diffusing wave spectroscopy investigations of acid milk gels containing pectin

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Abstract

The influence of the polysaccharide pectin on the gelation of acidified milk is studied in concentrated, undiluted, quiescent systems, primarily using diffusing wave spectroscopy. For pectins with a low degree of methylesterification (DM), interactions with milk-serum calcium yielded precipitated polysaccharide aggregates, even without acidification, that subsequently did not interact with casein micelles. However, high DM fine structures do not interact significantly with serum-calcium and absorb onto casein micelles as the pH is reduced below 5. A limited surface coverage of high DM pectin facilitates efficient bridging which enhances the rate of micelle aggregation and subsequent gelation and produces a clear signature in the shape of the measured MSD. The work highlights the fact that the behaviour of pectin in milk systems depends not only on the interaction of different polymeric fine structures with casein micelles, but also to a large extent on the interactions with calcium.

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Acknowledgement

The authors acknowledge the financial support from the MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand) for the PhD scholarship of R.R. Vincent and from Fonterra and FRST for the PhD scholarship of A. Cucheval. The authors would also like to thank the Manawatu Microscopy Centre, in particular Dr Dmitry Sokolov, for his assistance with the confocal microscopy. Dr. PJB Edwards is thanked for assistance with the NMR measurements.

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Authors and Affiliations

  1. Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand

    A. Cucheval, R. R. Vincent, Y. Hemar & M. A. K. Williams

  2. MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington, New Zealand

    R. R. Vincent, Y. Hemar & M. A. K. Williams

  3. Fonterra Research Centre, Palmerston North, New Zealand

    A. Cucheval & D. Otter

Authors
  1. A. Cucheval
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  2. R. R. Vincent
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  3. Y. Hemar
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  4. D. Otter
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  5. M. A. K. Williams
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Correspondence to M. A. K. Williams.

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Cucheval, A., Vincent, R.R., Hemar, Y. et al. Diffusing wave spectroscopy investigations of acid milk gels containing pectin. Colloid Polym Sci 287, 695–704 (2009). https://doi.org/10.1007/s00396-009-2012-5

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  • DOI: https://doi.org/10.1007/s00396-009-2012-5

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