Effect of polyglycerol esters additive on palm oil crystallization using focused beam reflectance measurement and differential scanning calorimetry

Abstract

The effect of 0.1-0.7% (w/w) of polyglycerol esters (PGEmix-8) on palm oil crystallization was studied using focused beam reflectance measurement (FBRM) to analyze the in-line changes of crystal size distribution during the crystallization. FBRM results show that 0.1-0.5% (w/w) of PGEmix-8 did not significantly affect nucleation but slightly retarded crystal growth. The use of 0.7% (w/w) additive showed greater heterogeneous nucleation compared to those with lower dosages of additive. Crystal growth was also greatly reduced when using 0.7% (w/w) dosage. The morphological study indicated that the palm oil crystals were smaller and more even in size than when more additive was added. Isothermal crystallization studies using differential scanning calorimetry (DSC) showed increased inhibitory effects on palm oil crystal growth with increasing concentration of PGEmix-8. These results imply that PGEmix-8 is a nucleation enhancing and crystal growth retarding additive in palm oil crystallization at 0.7% (w/w) dosage.

Influence of Polyglycerol Ester Additive on Palm Oil Fractionation in Relation to the Crystal Size Distribution

“…Firstly, 700 g of RBDPO and the additive was loaded into the reactor that was equipped with a glass anchor agitator, stirred at a rate of 30 rpm. The same temperature program as the previous study was applied in this study (Saw et al, 2017). The oil mixture was first heated to 70°C to fully melt and homogenise the additive and the oil.…”

“…The effect of PGEmix-8 on palm oil crystallisation was studied in the previous article (Saw et al, 2017). The article concluded that PGEmix-8 additive greatly affected crystallisation of palm oil by enhancing nucleation and retarding crystal growth, which resulted in the formation of smaller and even size crystals (Saw et al, 2017).…”

“…The study showed that 0.7% (w/w) PGEmix-8 promotes nucleation by creating additional heterogeneous nuclei. The study concluded that the additive greatly affected the crystal size distribution during palm oil crystallisation, leading to the formation of a huge quantity of smaller and more even sized crystals as compared to the control (Saw et al, 2017). Such changes in crystal size distribution may affect the fractionation process of palm oil.…”

“…In our previous study, the influence of polyglycerol esters (PGEmix-8) additive on palm oil isothermal crystallisation was studied using Focused Beam Reflectance Measurement (FBRM) and Differential Scanning Calorimeter (DSC) (Saw et al, 2017). The study showed that 0.7% (w/w) PGEmix-8 promotes nucleation by creating additional heterogeneous nuclei.…”

Influence of Fatty Acid Moieties of Sorbitan Esters on Polymorphic Occurrence of the Palm Mid‐Fraction

“…The effects of an emulsifier on fat crystallization are dependent on the structure of the emulsifier (Rizzo, Norton, & Norton, ; Wang et al, ), the chain length of the fatty‐acid moieties (Basso et al, ; Chaleepa, Szepes, & Ulrich, ; Chen, Zhang, Bi, & Cheong, ; Sonwai, Podchong, & Rousseau, , ), and whether the fatty acid is saturated or unsaturated (Fredrick, Foubert, Van De Sype, & Dewettinck, ; Maruyama et al, ). Crystallization conditions, the concentration of emulsifiers (Basso et al, ; Kim & Marangoni, ; Maruyama et al, ; Rizzo et al, ; Saw, Hishamuddin, Chong, Yeoh, & Lim, ; Shimamura, Ueno, Miyamoto, & Sato, ; Verstringe, Danthine, Blecker, Depypere, & Dewettinck, ), and the cooling rate (Shimamura et al, ) also influence the crystallization process of fats.…”