Effect of storage temperature and duration on rheological and thermal characteristics of superolein oleogels

• Main Authors: Saw, Mei Huey, Lim, Wen Huei, Yeoh, Chee Beng, Tan, Chin Ping
• Format: Article
• Language: English
• Published: Malaysian Palm Oil Board 2023
• Online Access: http://psasir.upm.edu.my/id/eprint/107533/1/EFFECT-OF-STORAGE-TEMPERATURE-AND-DURATION-ON-RHEOLOGICAL-AND-THERMAL-CHARACTERISTICS-OF-SUPEROLEIN-OLEOGELS.pdf; http://psasir.upm.edu.my/id/eprint/107533/; https://jopr.mpob.gov.my/effect-of-storage-temperature-and-duration-on-rheological-and-thermal-characteristics-of-superolein-oleogels/
• Institution: Universiti Putra Malaysia

The study was conducted to investigate the effects of storage temperature and duration on the rheological and thermal characteristics of superolein oleogels derived from 3% w/w of polyglycerol behenic acid ester (PBA), 3% w/w of sunflower wax (SFW) and 8% w/w of fully hydrogenated palm-based monoacylglycerols (MGHO). The results indicated that the storage modulus (G’), loss modulus (G”) and critical stress values were much higher for all the oleogels when stored at 5°C. At 15°C, the rheological parameters for SFW and MGHO oleogels were gradually increased during storage. From the thermal analysis, the peak intensity at approximately 20°C also gradually increased during storage, demonstrating the marked increase in the rheological parameters were due to the crystallisation of the triacylglycerol (TAG) in the superolein during the three-day storage. This effect was not observed for PBA oleogels, showing that the PBA inhibited or delayed crystallisation of the superolein molecules at 15°C. However, an extended storage study revealed that the PBA actually delayed and did not inhibit the crystallisation of the superolein. At 25°C, all the oleogels were highly unstable with poor thermal and rheological properties. The results suggested that 15°C was a more suitable temperature for the storage of superolein oleogels.