Cocoa-butter long spacings and the memory effect

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Abstract

Depending on the maximum temperature before cooling, cocoa butter recrystallizes in the β(V) and/or β(VI) phase. In order to obtain structural information on the seed material initiating this recrystallization process, experiments with cocoa butter were performed at a small-angle X-ray scattering station. Crystallization of cocoa butter at various crystallization temperatures provided long d-spacing values (d>45 Å) that can be attributed to the polymorphic phases. From the recrystallization experiments it is concluded that the seeds initiating rapidstarting recrystallization have an 1,3-distearoyl-2-oleoylglycerol-dominated triple chain-length packing. Furthermore, the β(VI) phase of cocoa butter seems to adopt a similar packing. The seed crystals that initiate the slow-starting recrystallization and result in the β(V) phase are likely to be different from those giving the β(VI) phase.