Understanding the Influence of Encapsulating Matrix on the Physical and Thermal Properties of Oregano Essential Oil Powder

Abstract

In this study, the influence of blends of carbohydrates on the physical and thermal properties of oregano essential oil micro particles was evaluated. Powders were produced by spray drying using different wall materials: gum Arabic (GA), modified starch (MS) and maltodextrin (MD). The micro particles were characterized by morphology, moisture content, water activity, particle size distribution, particle mean diameter, poly dispersity index, glass transition temperature (Tg) and thermal stability. The partial replacement of GA by MS or a mixture of MS and MD resulted in micro particles with lower moisture content. The results showed that micro particles with GA had higher values of Tg (97.02 °C), indicating more physical stability. However, the use of MS and MD results in a slight reduction of Tg. TGA results showed that the nature of wall materials have considerable effect on the thermal degradation of micro particles. Thermal analysis revealed the potential of application of these carbohydrates for substitution of GA.

Microencapsulation of Phenolic Extract from Sea Grape (Coccoloba uvifera L.) with Antimutagenic Activity

“…Weight loss in this step agrees with MC's results. The second weight variation (168.5 and 328 °C) was associated with the depolymerization process, thermal degradation of the wall material of microparticles, and extract decomposition [33,37] . The weight loss was higher in microparticles with extract (84.66±0.03 %) in comparison with microparticles without extract (79.10±0.05 %, Figure 2 b ).…”

“…Due to the increment in inlet air temperature produces droplet surface hardening [31] and accelerates evaporation rate, resulting in less droplet shrinkage and, as a consequence, a less dense powder [32] . In addition to this, the polymerization degree of wall materials also affects the bulk density value of a powder [33,34] …”

Functionalized biomaterials based on poly(vinyl alcohol) and chitosan as a vehicle for controlled release of cabreuva essential oil

“…In this sense, the combination of wall materials is an adequate procedure to protect the active agent, as well as to obtain more stable particles. [ 23 ]…”

“…In this sense, the combination of wall materials is an adequate procedure to protect the active agent, as well as to obtain more stable particles. [23] On the other hand, an important property of films loaded with EOs is their capacity to act as a device of controlled release, which represents an advantage from the biomedical point of view. Although diverse works exist dedicated to the controlled release of EOs from polymer matrix, [24][25][26] there is no comprehensive evaluation of the kinetics of the release process.…”

ATR-FTIR-MIR Spectrometry and Pattern Recognition of Bioactive Volatiles in Oily versus Microencapsulated Food Supplements: Authenticity, Quality, and Stability

“…The adsorption on the matrix surface stabilizes the volatile components against inadequate temperature, humidity, and oxygen [ 31 ]. Microencapsulation became a common technique for obtaining pharmaceuticals and dietary supplements, also being used for targeted medical therapies [ 32 , 33 , 34 , 35 ].…”