The effects of chocolate shell particle size were investigated by means of its influence on rate of oil migration
and fat bloom development. The particle size of the non-fat particles in the chocolate, i.e. sugar and
cocoa particles was varied between 15, 22 and 40 lm. A novel set of analytical techniques was used and
by combining migration results with surface topology results clear differences could be observed
between the samples. At 23 C storage the samples with a particle size of 15 lm showed higher rate of
oil migration and further, the earliest development of fat bloom at the surface. This could be observed
both macroscopically and microscopically. Thus, it appears as a larger specific surface area of the nonfat
particles facilitates migration of filling oil, possibly due to a more heterogeneous and coarser crystal
network with higher permeability. Molecular diffusion cannot explain the level of oil migration observed
and, thus, convective flow is assumed to be an important contribution in addition to the molecular
diffusion.
The effects of chocolate shell particle size were investigated by means of its influence on rate of oil migrationand fat bloom development. The particle size of the non-fat particles in the chocolate, i.e. sugar andcocoa particles was varied between 15, 22 and 40 lm. A novel set of analytical techniques was used andby combining migration results with surface topology results clear differences could be observedbetween the samples. At 23 C storage the samples with a particle size of 15 lm showed higher rate ofoil migration and further, the earliest development of fat bloom at the surface. This could be observedboth macroscopically and microscopically. Thus, it appears as a larger specific surface area of the nonfatparticles facilitates migration of filling oil, possibly due to a more heterogeneous and coarser crystalnetwork with higher permeability. Molecular diffusion cannot explain the level of oil migration observedand, thus, convective flow is assumed to be an important contribution in addition to the moleculardiffusion.
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