Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin

Investigating the Principles of Recrystallization from Glyceride Melts

“…After 24 h of storage, only the β-form of the lipid can be detected. Interestingly, the β′-form cannot be detected, a fact which is in accordance with the literature (29). Two reasons have been proposed for this: on the one hand, the melting of the β′-form is strongly suppressed by the recrystallization of the β-form which hinders its detection, and on the other hand, there is evidence that the α-form can directly transform to the β-form.…”

“…The XRPD patterns of tristearin are depicted in Fig. 2e, f. The freshly resolidified sample exhibited only the α-form of the lipid, as indicated by the sole peak at 21.4° (29). The same results could be found for the samples stored at room temperature over 48 days.…”

“…Samples stored at 40°C exhibited solid-state transformations during storage. As for tripalmitin, no peaks indicating the β′-form (peaks at 21.1°and 23.3°) can be observed as discussed above (29)…”

“…2c, d. The freshly resolidified sample exhibits only the pure α-form, as indicated by the peak at 21.4° (29). During the storage at room temperature (Fig.…”

“…The freshly resolidified sample of trilaurin exhibits several peaks which can be related to different polymorphic forms. Peaks at 19.4°a nd 23.1°are due to the β-form, whereas the peak at 21.1°c orresponds to the β′-form (29). After 24 h of storage at room temperature, only the stable β-form can be detected using both DSC and XRPD (Figs.…”