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Impact of aging on the phase behavior of cocoa butter and copra oil blends. Impact du vieillissement sur le comportement de phase des mélanges de beurre de cacao et d'huile de coprah
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International audience. Aging of cocoa butter (CB)/copra oil (CO) binary blends (noted CB/CO) is investigated through a multitechnique approach. Indeed, the phase behavior of non-aged and 30 days-aged cocoa butter/copra oil binary blends (CB/CO) at 4°C is studied, using a combination of Nuclear Magnetic Resonance (NMR), Differential Scanning Calorimetry (DSC) and X-Ray Diffraction (XRD). During subsequent heating from 4°C to 40°C, solid fat content depression between 15°C and 20°C is shown with NMR, with the most pronounced occurring at two different compositions for the non-aged (60% CO addition in CB) and for the 30 days-aged mixtures (80% CO addition in CB). In agreement, DSC exposes melting enthalpy and melting temperature depression for the aged-blend 80/20 CB/CO. XRD highlights fat interactions at the nanoscopic scale and allows the precise attribution of polymorphic transitions perceived with DSC. The melt-mediated transformation of CB crystals from β' 2-2L to β 2-3L is shown in non-aged blends containing 0% to 10% of CO in CB, whereas it is shown to occur in blends containing 0% to 60% CO in CB for the 30 days aged-blends. As a result of this study, all the results obtained with the various methods are used to build the very first complete pseudo-phase diagram of 4°C-aged CB/CO blends, it highlights the shift of the eutectic points after 30 days of storage. We think that such a fundamental work can bring new understanding of a well-known issue as encountered in chocolate-based products storage.
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