Effect Of Wall Material Research Articles

Fabrication, characterization and simulated gastrointestinal digestion of sea buckthorn pulp oil microcapsule: effect of wall material and interfacial bilayer stabilization.

Sea buckthorn (Hippophae rhamnoides L.) pulp oil is rich in functional components; however, low water solubility and stability limit its applications. This study fabricated sea buckthorn pulp oil microcapsules using whey protein isolate (WPI), soy protein isolate (SPI), sodium caseinate (NaCN), gum arabic (GA), starch sodium octenylsuccinate (OSAS) and SPI mixed with chitosan (CHI). The influences of these wall materials on physicochemical properties, release behavior and digestibility were explored. Protein-based wall materials (WPI, NaCN, SPI) demonstrated lower bulk densities due to their porous structures and larger particle sizes, while GA and OSAS produced denser microcapsules. Encapsulation efficiency was the highest for protein-based microcapsules (79.41-89.12%) and the lowest for GA and OSAS. The surface oil percentage of protein-based microcapsules (1.41-4.40%) was lower than that of the other microcapsules. Protein-based microcapsules showed concave and cracked surfaces, while GA and OSAS microcapsules were spherical and smooth. CHI improved reconstitution performance, leading to faster dissolution. During simulated gastrointestinal digestion, protein-based microcapsules released more free fatty acids (FFAs) in the intestinal phase, while CHI-modified SPI microcapsules showed a delayed release pattern due to thicker walls. Protein-based wall materials were more effective for sea buckthorn pulp oil microencapsulation, providing higher encapsulation efficiency, better flow properties and releasing more FFAs. The addition of CHI led to the layer-by-layer self-assembly of the microcapsule wall and resulted in sustained release during in vitro intestinal digestion. These findings suggested the potential of protein-based microcapsules for targeted delivery and improved applications of bioactive oils in the food industry. © 2024 Society of Chemical Industry. Published by John Wiley & Sons Ltd.

Effects of wall material, working fluid, and barriers on performance of a nano flat-plate heat pipe: Molecular dynamics simulation

The use of microscale heat generating or heat transfer equipment with higher capacity and smaller dimensions requires more accurate management and better disposal of their produced heat. This makes the necessity of designing and manufacturing superconductors completely clear. In the meantime, the nano-grooved flat plate heat pipes (FPHP) have gained the industry’s attention. Due to the provision of the conditions for manufacturing devices on a micro scale, it is possible to integrate this type of heat pipe with other microscale devices. In the meantime, understanding their behavior on small scales requires more studies. In this paper, the effect of using barriers to improve the thermal performance of a nano FPHP (1050×220×95Å) is evaluated. Simulations are performed on a molecular scale through molecular dynamics (MD) simulations using LAMMPS® software. Platinum (Pt), copper (Cu), and aluminum (Al) are used for HP’s body. In addition, argon (Ar), water (H2O), and ethanol (EtOH) are used as working fluids. The results show that increasing the number of barriers leads to improved thermal performance. Different cases include different teeth called barriers augmented inside HP are simulated. The combination of Cu-EtOH showed the best thermal performance (about 18% better than other cases). Cubical barriers have more heat flux improvement than conical ones (from 3.5% up to about 10.7%). Among the three fluids used, EtOH leads to a better heat flux (about 6% for Pt and up to 15% for Cu). Using 24 barriers, a very favorable result of 1992 W/cm2 heat flux is achieved. In this case, the minimum heat flux is obtained by using Pt and Ar and is 1609 W/cm2. Using Ar and the cub shape barriers, the highest mass transfer rates for Pt, Cu, and Al are about 35.2%, 38.9%, and 38%, respectively.

Effects of wall materials on the physicochemical properties of spray-dried bitter gourd (Momordica charantia L.) powders

Bitter gourd has numerous health-promoting effects on the human body. However, its use has been greatly limited due to its poor acceptance by consumers, resulting from its strong bitterness. This study investigated the effects of five wall materials, namely, soybean protein isolate, gum arabic, maltodextrin, resistant starch, and a soybean lecithin calcium caseinate mixture, on the physicochemical properties of spray-dried bitter gourd powders. The results showed that all five wall materials reduced the moisture content, water activity, browning degree, agglomeration, and bitterness of the spray-dried bitter gourd powder. Maltodextrin was found to be the most effective at reducing water activity, while soybean protein isolate was best at protecting the colour, and the soybean lecithin calcium caseinate mixture was best at reducing hygroscopicity and masking bitterness. Additionally, all five wall materials improved the preservation of flavonoids, saponins, and vitamin C, with soybean protein isolate being the most effective in improving the total flavonoid retention ratio and the soybean lecithin calcium caseinate mixture being the best in improving the retention ratios of total saponins and vitamin C. The spray-dried bitter gourd powder prepared with soybean protein isolate had the highest antioxidant activity and α-glucosidase inhibitory activity. These results are significant for understanding the relationship between wall materials and the physicochemical properties of spray-dried powder. Additionally, these materials provide bitter gourd product manufacturers with useful guidance for producing high-quality products. Furthermore, the results could provide useful insights for processing fruits with similar product characteristics, thus contributing to the enrichment of food processing knowledge.

Wall material effects in a minimized electron cyclotron resonance ion thruster

Wall material effects in micro-ion thrusters attracts significant research attention with respect to weakening plasma wall loss, and increasing propellant utilization to obtain high-precision and low-thrust of micro-Newton propulsion, as required in new generation space observation missions. In this study, we compare the performance and discharge characteristics of different wall materials, namely, Mo and Al2O3 in a minimized electron cyclotron resonance ion thruster. The results show that the propellant utilization and specific impulse of the ceramic are about three times higher than those of the Mo at a low mass flow rate of 0.03 sccm. In addition, a planar Langmuir probe is used in the discharge chambers, and the results show that the secondary electron emission of Al2O3 effectively reduces the electron temperature, increases the electron density, and results in high efficiency. These results are helpful for improving the performance of micro-ion propulsion devices for microsatellites and space-borne gravitational wave detection missions.

Effect of wall material on lipophilic functional compounds of high oleic palm oil emulsions encapsulated by Refractance Window drying

High-oleic palm oil is a food-grade oil with desirable properties, as it is characterised by having an oleic acid concentration above 50 % and a high vitamin E and provitamin A content. This study investigated the effect of different combinations of two wall materials (whey protein (WP) and Capsul®, a commercial octenyl succinic anhydride modified starch (OSA-MS)) on the concentration of provitamin A, vitamin E and oleic acid, and the physical properties of high oleic palm oil emulsions encapsulated by Refractance Window drying technology. Wall material composition significantly affected (p < 0.05) all response variables, and R2 values were above 0.75 for all responses. Phytonutrient preservation showed its highest at an OSA-MS: WP concentration ratio of 1: 3. Optimal results were achieved (minimum moisture content, water activity and hygroscopicity, and maximum encapsulation efficiency and phytonutrient preservation) at an OSA-MS concentration of 8.13 % and WP concentration of 91.87 %. Flakes were obtained as a solid structure that protects oil's phytonutrients with 94 %, 75 % and 87 % of preservation of oleic acid, vitamin E and carotenoids, respectively. It shows that the wall material combination and encapsulation technique are suitable for obtaining lipophilic functional compounds.

Microencapsulation of organic pomegranate peel extract for a food circular economy: Effects of wall materials on powder functional attributes, antioxidant activity and antimicrobial property against foodborne pathogens

In the present study, the potential of maltodextrin (MT), gum Arabic (GA), and waxy starch (WS) as wall materials for producing functional pomegranate peel extract powder (PPEP) was explored. Utilizing in vitro methodologies, this study aims to investigate the impact of different wall materials on the quality and properties of encapsulated PPEP. The organic pomegranate peel extracts, produced using 70% ethanol, were encapsulated using 10% (1:10, w/v) of the different wall materials before freeze-drying. The resulting PPEPs were characterized based on their technofunctional, physicochemical, morphological, crystallinity, antioxidant, and antimicrobial properties. The GA-encapsulated PPEP demonstrated a FRAP activity of 9 mM TE/100 g DM, which is 1.4-fold higher than the 6.40 mM TE/100 g DM observed in WS-encapsulated PPEP. Similarly, GA-encapsulated PPEP showed a DPPH radical scavenging activity of 11.21 mM TE/100 g DM, 10.7–12.6% higher than WS-encapsulated PPEP. Metabolites, including ellagic acid, punicalin α, punicalin β, and punicalagin α, were significantly higher in MT-encapsulated powder. These results establish the potential of PPEP as a natural antioxidant and antimicrobial agent for food preservation, with GA and MT as favorable wall materials. Future work will explore the synergistic effects of blending GA and MT as wall materials and assess controlled release mechanisms.

Encapsulation of Menthol and Luteolin Using Hydrocolloids as Wall Material to Formulate Instant Aromatic Beverages.

Aromatic plants represent about 0.7% of all medicinal plants. The most common are peppermint (main active ingredient: menthol) and chamomile (main active ingredient: luteolin), which are usually consumed in "tea bags" to make infusions or herbal teas. In this study, menthol and luteolin encapsulates using different hydrocolloids were obtained to replace the conventional preparation of these beverages. Encapsulation was carried out by feeding an infusion of peppermint and chamomile (83% aqueous phase = 75% water - 8% herbs in equal parts, and 17% dissolved solids = wall material in 2:1 ratio) into a spray dryer (180 °C-4 mL/min). A factorial experimental design was used to evaluate the effect of wall material on morphology (circularity and Feret's diameter) and texture properties of the powders using image analysis. Four formulations using different hydrocolloids were evaluated: (F1) maltodextrin-sodium caseinate (10 wt%), (F2) maltodextrin-soy protein (10 wt%), (F3) maltodextrin-sodium caseinate (15 wt%), and (F4) maltodextrin-soy protein (15 wt%). The moisture, solubility, bulk density, and bioavailability of menthol in the capsules were determined. The results showed that F1 and F2 presented the best combination of powder properties: higher circularity (0.927 ± 0.012, 0.926 ± 0.011), lower moisture (2.69 ± 0.53, 2.71 ± 0.21), adequate solubility (97.73 ± 0.76, 98.01 ± 0.50), and best texture properties. Those suggest the potential of these powders not only as an easy-to-consume and ecofriendly instant aromatic beverage but also as a functional one.

An investigation of the effects of wall materials on flame dynamics inside a H2-air micro-combustor

Micro-combustors, which are emerging as portable power sources, have serious flame stabilization issues due to enhanced heat losses. Hydrogen, an eco-friendly alternative to conventional fossil fuels, can be a potential fuel for micro-combustors because of its high calorific value, leading to high energy density. In the present work, numerical simulations of premixed lean (equivalence ratio = 0.5) hydrogen-air flames in a 2 mm wide channel with three different wall materials (glass, steel, and aluminum) were performed. The effects of the wall material on the dynamics of the flames were extensively studied. The walls of the combustor play an important role by conducting heat upstream and facilitating ignition and stabilization of the flame. For different values of wall thermal diffusivity, periodically oscillating flames of varying frequencies ( ∼ 400 − 1200 Hz) and intermittent bursting flames were observed. Time series analysis and modal decomposition of temperature fields were utilized to quantify the flame dynamics and to identify the dominant structures of the flames. A recurrence analysis using the temperature time series data revealed significant differences in flame dynamics, including period-2 oscillations and intermittency, for different wall materials. The underlying physics behind the periodic oscillations and intermittent bursting has been explained.

A NOVEL DESIGN-BASED OPTIMIZATION SOLUTION FOR BUILDING BY SENSITIVITY ANALYSIS

The important objective of a building must be to provide a comfortable environment for people. Heating, ventilation and air conditioning (HVAC) systems provide a comfortable environment, but they are using high energy consumption, therefore, designing an energy-efficient building that balances energy performance and thermal comfort is necessary. To achieve this subject is important to choose the effective parameters for energy performance. This research aim is to produce a methodology for multi-objective optimization of daylight and thermal comfort in order to study the effect of wall material and shading of an office building (Tehran a basic-location). The building simulation was developed and validated by comparing predicted daylight hours and thermal comfort hour based on test and training on Jupiter Notebook (Anaconda3). The sensitivity analysis uses a multiple linear regression (MLR) method. Secondly, optimization is based on a genetic algorithm (GA) with the effective parameters to optimize the daylight and thermal comfort performance. For this, we developed a parametric model using the Grasshopper plugin for Rhino and then use Honeybee and Ladybug plugins to simulate thermal comfort and daylight, at the end use the Octopus engine to find an optimization solution. The result of this paper is essential as a preliminary analysis for shading devices, window-to-wall ratios, and wall construction optimization in the open-plan office.

A study of charging characteristics of binary mixture of polyolefin particles by using horizontal airflow to separate large and small particles

The charging characteristic of the binary mixture of particles is important for understanding the electrostatic discharging behavior of charged particles. However, most studies have focused on the charge polarity of particles rather than the specific charge level. This paper studied the charging characteristic of a binary mixture of polyethylene particles by using horizontal airflow to separate the large and small particles under different mass fractions and the initial charge-to-mass ratios of the small particle, and the effect of wall materials and the size ratios. The results indicate that the large and small particles tend to gain positive and negative charges, respectively, and the positive charge-to-mass ratio of the large particle can be greater than the absolute value of the negative one obtained in fluidizing the large particles alone. Increasing the initial charge-to-mass ratio of small particles and decreasing the size ratio decrease the positive charge level of the large particles. Moreover, the type of the wall material also alters the charge-to-mass ratio of large particles. Based on the single-particle collisional charging experiments, the magnitude and direction of charge transfer in the particle-particle and particle-wall collisional processes are determined.

Energy assessment, economic analysis, and environmental study of an Iranian building: The effect of wall materials and climatic conditions

The selection of external wall materials based on climatic conditions is an effective way to improve building energy performance. Because of the wide variety of commercial materials available for exterior walls, engineers and building designers rarely select these materials based on climatic conditions. In this study, the thermal performance of a building was investigated using Design-Builder software (V4.2.0.054) in three different Iranian climatic zones (hot desert, cold semi-arid, and continental Mediterranean climates) and six common wall materials (AAC block, LECA block, extruded polystyrene). A novel thermoelectric device was used to measure the thermal conductivity of these materials. According to the findings, choosing the right wall materials based on climate conditions can reduce annual heating and cooling loads as well as carbon dioxide emissions by up to 23.2 %, 26.4 %, and 18.5 %, respectively. According to the economic analysis, the payback period time ranges between 1.7 and 17 years, depending on the climatic conditions and the type of exterior walls.

Experimental and numerical study of free-falling streams of particles impacting an inclined surface

This paper presents a detailed experimental and numerical analysis of free-falling particle streams impacting a 45° inclined surface of differing materials. The particles used in this study were glass spheres with average diameters of 136 and 342 µm and a density of 2500 kg/m3. The three mass flow rates considered are 50, 150, and 250 grams per minute (gpm). The effect of wall material on the collision process was also analysed. Special attention was paid to the influence of wall roughness. Therefore, a plate of stainless steel with polished surface, an aluminium sheet, and a Perspex plate with similar properties to those of the rest of the wall sections were used. The experimental data were used to improve and validate a wall collision model in the frame of the Lagrangian approach. A new drag force formula that includes the effects of particle concentration as well as particle Reynolds number was implemented into commercially available codes from CFX4-4 package. It was found that the improved CFD model better predicted the experimental measurements for the particle rebound properties. The rough-wall model in these results showed greater effect on smaller particles than on larger particles. The results also showed that the improved CFD model predicted the velocity changes slightly better than the standard model, and this was confirmed by both the quantitative velocity comparisons and the qualitative concentration plots. Finally, the inclusion of the particle-particle collision was shown to be the dominant factor in providing the dispersion of the particles post collision. Without a sufficient particle-particle collision model, the standard model showed all particles behaving virtually identical, with the main particle stream continuing after the collision process.

Impact of biopolymer-surfactant interactions on the particle aggregation inhibition of β-carotene in high loaded microcapsules: Spontaneous dispersibility and in vitro digestion

The particle aggregation of β-carotene has been a challenge for the development of powdery microcapsules with a high loading. Herein, solvent-free β-carotene high loaded microcapsules based on the wet-milling technique were fabricated by using a complex stabilizer composed of octenyl succinic anhydride modified starch (OSA-starch) and tea saponin (TS). The influence of biopolymer-surfactant interactions on the particle aggregation inhibition of β-carotene in the microcapsules was investigated. The particle size distribution, micromorphology, redispersibility and in vitro digestion of the microcapsules were altered by regulating the addition sequence and the mass ratio of both stabilizers. The optimized β-carotene microcapsule presented a small particle size after rehydration (275.1 nm) with the high encapsulation efficiency and loading capacity (99.04% and 18.87%, respectively). As analyzed by FTIR and XRD, the hydrogen bonding and hydrophobic interactions between β-carotene and wall materials were involved in the amorphization of β-carotene. SEM and CLSM images jointly verified that the biopolymer-surfactant complex retarded the expansion of the microcapsules, and the dents on the surface of microcapsules facilitated the moisture infiltration during rehydration. Moreover, the wall material composition of microcapsules further affected the bioaccessibility of β-carotene during the simulated digestion, and the bioaccessibility of β-carotene was increased from 2.73% to 15.97% due to the enhanced micellization and transport capacity of β-carotene. •Competitive adsorption and hydrophobic effects of wall materials occurred on the particle surface. •The biopolymer-surfactant complexation prevented β-carotene from reaggregation. •The surface irregularity contributed to the spontaneous dispersibility of microcapsules. •The bioaccessibility of β-carotene was improved by adding TS into wall materials.

Investigation of the effect of wall material on the exchange of information between fluid and surface using the hybrid atomistic-continuum method

Investigation of the effect of wall material on the exchange of information between fluid and surface using the hybrid atomistic-continuum method

Transient Heat Transfer Analysis on Composite Solids for Hypersonic Flow Applications

Surface heating rates have the importance in high speed flow due to viscous or aerodynamic heating which leads to enormous rise in surface temperature. Prediction of exact heat transfer rates is essential for design of protection systems for aerodynamic bodies aimed. For the thermal protection system, the aerodynamic Surfaces are generally configured with multiple solids. Hence present study is planned to develop the conjugate heat transfer (CHT) solver for composite solids. A CHT solver is in hypersonic flow environment. Finite volume framework and explicit time stepping have been implemented for both the compressible Navier-Stokes solver and conduction solver. Loose coupling has been established between the above mentioned fluid and solid domain solvers. The following observations were made in the CHT simulations. In the case of hypersonic flows over finite thickness flat plate, considerable difference in surface heat transfer rate has been noticed along the stream wise direction at the solid-fluid interface and also the Effect of wall material on heat diffusion for hypersonic application has been analyzed using loosely coupled CHT solver. The CHT solver has also been implemented for hypersonic flow over composite cylinder. Necessity of insulating material in the region of stagnation point has been realized as the outcome of these studies.&#x0D; HIGHLIGHTS&#x0D; &#x0D; Accurate prediction of Convective heating rates is essential for the design of thermal protection system for hypersonic vehicles&#x0D; In The thermal protection system, the aerodynamic surfaces are generally configured with multiple solids. Hence the present study is planned to develop the conjugate heat transfer (CHT) solver for composite solids&#x0D; The CHT solver has been implemented for hypersonic flow over composite flat plate and cylinder. It has been observed flows over finite thickness flat plate, a considerable difference in surface heat transfer rate has been noticed along the stream wise direction at the solid-fluid interface and the necessity of insulating material in the region of stagnation point has been realized as the outcome of these studies&#x0D; &#x0D; GRAPHICAL ABSTRACT

Effects of Wall Material on Medium-Chain Triglyceride (MCT) Oil Microcapsules Prepared by Spray Drying.

A medium-chain triglyceride (MCT) oil microcapsule was prepared by spray drying. The effects of the wall-material parameters of wall-to-oil ratio (1:1 to 3:1) and type of wall material (gum arabic (GA), whey protein isolate (WPI), and octenyl succinic anhydride (OSA) starch) on the microcapsules were evaluated. The droplet size, size distribution, viscosity, zeta potential, and stability of the emulsions were measured. The spray-dried powder was characterized by its morphology, yield, encapsulation efficiency, and moisture content. The wall material influenced the characteristics of the emulsions and microcapsules. The formulation with a 2:1 wall-to-oil ratio and OSA starch/maltodextrin as the wall material resulted in a small droplet size (0.177 ± 0.002 µm) with high encapsulation efficiency (98.38 ± 0.01%). This formulation had good physical stability over three months under accelerated conditions. Thus, OSA starch/maltodextrin is an appropriate wall material for encapsulating MCT oil.

Nano-encapsulation of sweet basil essential oil based on native gums and its application in controlling the oxidative stability of Kilka fish oil

In line with the application of green techniques in the recovery of bioactive compounds, this research study aimed to evaluate the efficiency of supercritical Co2 and water distillation in the extraction of sweet basil essential oil. In addition, the effect of wall material made of native gums as well as Lepidium sativum (LS), Lepidium perfoliatum (LP), and a combination of both (LP/LS), following freeze-drying method, on Nano-emulsion properties of encapsulated sweet basil essential oil was evaluated. The encapsulation efficiency (EE%), particle size, polydispersity index, zeta potential (ζ), scanning electron microscopy, viscosity, Brix, pH, density, humidity, water activity, and Fourier transform infrared of nano encapsulated powder were studied. The EE of supercritical fluid was significantly higher (6.3%) in contrast to the distillation of water (1.4%). To study the oxidative stability, essential oil of sweet basil in free mode 1%, 5% and 20% (w/w) and in the encapsulated form 20% (w/w) added to Kilka oil and compared with tert-butylhydroquinone (TBHQ) as synthetic antioxidants at 0.01% (w/w). The results showed that sweet basil essential oil had antioxidant activity and reduced the oxidation process. Unlike free essential oil, nanocapsule essential oil (especially with a coating of LP gum) showed better antioxidant activity comparable to that of TBHQ. Thus, encapsulated sweet basil essential oil with LP gum showed promising results in retarding the fish oil oxidation, which can be introduced as a novel natural antioxidant specifically in emulsion, based food systems.

Effect of Wall Material and Inlet Drying Temperature on Microencapsulation and Oxidative Stability of Pomegranate Seed Oil Using Spray Drying.

Pomegranate seed oil is a highly unsaturated fatty acid and liable to be oxidized; hence, oil was encapsulated to protect its bioactive materials and increase shelf life with the most common spray drying technique. Whey protein (WP) alone and in combination with Maltodextrin (MD) in the ratio 1:4 weight was utilized. Feed emulsion, droplet size, encapsulation efficiency (EE), moisture, bulk density, powder morphology, particle size, hygroscopicity, and solubility were also analyzed. The spray drying conditions were applied: inlet temperature 125 to 150°C and outlet 60 to 67°C, airflow rate 40-42 m3/mint, feed rate 5.2 g/m, and pump rate 40%. The shape of particles was spherical and round with dents on their surface. After encapsulation, the oxidative stability was monitored at 60°C for 15 days (8 h daily). The smaller droplet size of the emulsion was obtained at 35% total solid contents. WP alone showed better EE (90%) and oxidative stability than the combination of WP and MD as wall materials.

Effects of Wall Materials on the Structure and Antioxidant Activities of the Bamboo Leaves Flavonoids Microcapsules

In this experiment, the bamboo leaves flavonoids microcapsules were prepared by spray-drying using maltodextrin, arabic gum, gelatin, soy protein isolate and monosaccharide laurate as wall materials. The properties and encapsulation effect of microcapsules prepared by five wall materials were investigated by scanning electron microscope (SEM), laser particle size distribution, physicochemical properties and antioxidant activity. The results showed that microcapsules prepared with arabic gum had the highest encapsulation rate (91.23%±1.00%), the highest stacking density (0.53±0.01 g·cm-3), the lowest resting angle (33.27°±1.20°), and the lowest moisture content (5.55%±0.39%). These microcapsules had good fluidity and storage performance. The particle size distribution resulted in descending order as the following monosaccharide laurate (22.87 μm), soybean protein isolate (15.65 μm), maltodextrin (14.26 μm), gelatin (8.95 μm), and arabic gum (6.96 μm). The results of SEM showed that the microcapsule prepared by arabic gum was spherical and the surface was relatively smooth. The microcapsules prepared by arabic gum had higher antioxidant activity and reducibility in vitro antioxidant activity and reducibility experiments, and its IC50 of DPPH radical scavenging was 364.3 μg/mL. In conclusion, the properties of bamboo leaves flavonoids microcapsules prepared with arabic gum were obviously better than those of other four wall materials microcapsules. The results could provide technical support for the development of more stable functions of the flavonoids of fang bamboo leaves.

The Effect of Wall Material Type on the Encapsulation Efficiency and Oxidative Stability of Fish Oils.

Fish oil is the primary source of long-chain omega-3 fatty acids, which are important nutrients that assist in the prevention and treatment of heart disease and have many health benefits. It also contains vitamins that are lipid-soluble, such as vitamins A and D. This work aimed to determine how the wall material composition influenced the encapsulation efficiency and oxidative stability of omega fish oils in spray-dried microcapsules. In this study, mackerel, sardine waste oil, and sand smelt fish oil were encapsulated in three different wall materials (whey protein, gum Arabic (AG), and maltodextrin) by conventional spray-drying. The effect of the different wall materials on the encapsulation efficiency (EE), flowability, and oxidative stability of encapsulated oils during storage at 4 °C was investigated. All three encapsulating agents provided a highly protective effect against the oxidative deterioration of the encapsulated oils. Whey protein was found to be the most effective encapsulated agent comparing to gum Arabic and maltodextrin. The results indicated that whey protein recorded the highest encapsulation efficiency compared to the gum Arabic and maltodextrin in all encapsulated samples with EE of 71.71%, 68.61%, and 64.71% for sand smelt, mackerel, and sardine oil, respectively. Unencapsulated fish oil samples (control) recorded peroxide values (PV) of 33.19, 40.64, and 47.76 meq/kg oil for sand smelt, mackerel, and sardine oils after 35 days of storage, while all the encapsulated samples showed PV less than 10 in the same storage period. It could be concluded that all the encapsulating agents provided a protective effect to the encapsulated fish oil and elongated the shelf life of it comparing to the untreated oil sample (control). The results suggest that encapsulation of fish oil is beneficial for its oxidative stability and its uses in the production of functional foods.