Antiphotooxidative Effect of Ascorbic Acid Microemulsion in Virgin Coconut Oil

Abstract

This study was intended to determine the effectiveness of ascorbic acid microemulsion for inhibiting photooxidation of virgin coconut oil (VCO). The ascorbic acid microemulsion was prepared by mixing ascorbic acid, deionized water, surfactant mixture, and VCO as continuous phase. Ascorbic acid microemulsion at 50, 100, 150, 200, or 250 ppm was dispersed into VCO. The same level of ascorbyl palmitate, TBHQ (tertiary butylhydroquinone), and BHA (butylated hidroxyanisole) were added into VCO and used for comparison. All of these samples were subsequently subjected to photooxidation under fluorescent light exposure (4,000 lux) for up to 8 hours at room temperature (30 ± 1 °C). Peroxide values and p-anisidine values of photooxidized samples were measured at 1 hour interval. The result indicated that at the level of 250 ppm, ascorbic acid which was included into the microemulsion system effectively inhibited photooxidation of VCO in comparison with the other antioxidants. This study confirmed that a highly hydrophilic singlet oxygen quencher (SOQ) such as ascorbic acid can be successfully incorporated into the microemulsion system and the addition of ascorbic acid microemulsion effectively inhibited photooxidation of VCO during storage under fluorescent light.

Design of Novel Tricaprylin-Incorporated Multi-Layered Liposomal System for Skin Delivery of Ascorbic Acid with Improved Chemical Stability

“…As previously reported, Vit C dissolved in aqueous media is principally degraded into dehydroascorbic acid and subsequently into 2,3-diketogulonic acid [ 33 ]. The irradiation of light in aqueous media resulted in the generation of reactive oxygen species [ 34 ], which accelerated the degradation of Vit C. For instance, under 4000 lx of fluorescent light exposure, the oxidation of Vit C in the microemulsion system gradually increased [ 35 ]. In addition, Vit C content (mg/L) in pasteurized milk stored under 1100, 2400, and 5800 lx of light irradiation was decreased from 12.93 mg/L to 8.38, 7.70, and 7.09 mg/L, respectively [ 36 ].…”

Evaluation and Optimization of Water-in-Oil Microemulsion Using Ternary Phase Diagram and Central Composite Design

“…One of the prerequisites for a stable microemulsion system is the selection of appropriate surfactant mixtures (surfactant and co-surfactant). Surfactant molecule improves thermodynamic stability (lowering Gibbs free energy) by providing layer around oil (o/w system) or water (w/o system) droplets and hence, its proper selection and composition of has been the foremost criteria [8][9][10].…”

Long wavelength undulations dominate dynamics in large surfactant membrane patches

“…Microemulsions are in use for a plethora of applications ranging from drug delivery 1,2 to enhanced oil recovery, [3][4][5][6] to food design. [7][8][9] Bicontinuous microemulsions for example can be used for cleaning of soils 10 and clay has been used in a wide range of applications but primarily for refining different types of oils from vegetables to minerals. 11 They have been studied for as long as 50 years, especially their interesting phase behaviors [12][13][14] but it only recently became feasible to study the near-surface dynamics of isolated membranes with a scattering technique called grazing incidence neutron spin echo spectroscopy (GINSES).…”