THE EFFECT OF VIRGIN COCONUT OIL CONTENT ON THE RHEOLOGICAL PROFILE OF VIRGIN COCONUT OIL-BASED LAMELLAR LIQUID CRYSTAL OF MIXED TWEEN 80:BRIJ 30 SYSTEM

  • Nor Ain Mohamed Arifin
  • Wan Rusmawati Wan Mahamod
  • Norlaili Abu Bakar
  • Norhayati Hashim
  • Norzakiatul Husna Isnolamran
  • Siti Aisyah Shamsudin
Keywords: SAXS, Lamellar Liquid Crystal, Virgin Coconut Oil, Rheological Analysis

Abstract

The health advantages of virgin coconut oil (VCO) and the diversity of its biological characteristics have garnered considerable attention recently. Nevertheless, scientific research on VCO-based applications is still under-reported particularly in Malaysia. This study aimed to investigate the effect of VCO content on the rheological profile of virgin coconut oil-based lamellar (V-Lα) liquid crystal systems of Tween80:Brij30/H2O/VCO. In addition, the influence of mixed surfactant to water (MS/W) ratio also investigated. V-Lα samples formulated using the titration method. The formation of lamellar liquid crystals confirmed based on the existence of birefringence texture and the appearance of two recurring scattering peaks in the SAXS spectrum. The rheological study shows that V-Lα samples exhibit the shear-thinning behaviour of pseudoplastic materials with a yield stress range of 11.4 – 50.0 Pa. The effects of VCO content and MS/W ratio was mutually significant on rheological profiles of V-Lα. The pseudoplastic properties of the La structure increased with increasing VCO content for samples with lower MS/W (0.56/0.44) while the pseudoplastic properties weakened with increasing MS/W especially at high VCO (10 wt%) content. These rheological findings of the V-Lα will open greater application opportunities in industries, especially pharmaceuticals, because of the uniqueness of lamellar liquid crystals that can mimic lipid skin bilayers and the health benefit of VCO.

Published
2021-12-20
Section
Original Research Articles