Coconut oil crystallization on tripalmitin and tristearin seed crystals with different polymorphs
2020
This study evaluates
the influence of the polymorphs of triacylglycerol
(TAGs) seed crystals on the crystallization of coconut oil (CO) using
seeding techniques. Tripalmitin (PPP) and tristearin (StStSt) with
three polymorphs (α, β′, and βα forms) were used as the seed materials. β form seed crystals
were prepared by transforming in the solid state from the α
form (βα) and by annealing TAG powder (βann). The CO crystallization on the TAG seed crystals was observed
at 20 °C using differential interference contrast microscopy
and synchrotron radiation X-ray diffraction. The seed crystals with
different polymorphs of PPP and StStSt promoted the nucleation of
the β′ form of CO by heterogeneous nucleation. The seed
crystals with the β′ form were the most effective accelerators,
indicating that polymorphic matching between seed crystals and CO
strongly induced the nucleation of CO by epitaxial growth. A longer
TAG fraction (such as LMP, PPP, etc., L is lauric acid, M is myristic
acid) of CO probably grew on the surface of the βann seed via the template effect with the same orientation as the seed.
These results indicate that the seed crystal polymorphs significantly
affect the efficiency of CO crystallization. Efficient seedings can
be used to improve the physical properties of CO via fractionation.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
18
References
1
Citations
NaN
KQI