Ultrasonic Power Research Articles

Two‐Phase Extraction, Structural Characterization of the Polysaccharide from Raspberry Pomace and Its Protection Effects against Erythrocyte Hemolysis

AbstractIn present study, a new polysaccharide (RPP) from raspberry pomace is prepared through ultrasound‐assisted aqueous two‐phase extraction (UAATPE) and purification using two‐step column chromatography, the extraction conditions are optimized by response surface method (RSM). Under the optimal parameters: liquid to material ratio of 80 mL g−1, ultrasonic power of 340 W, and ultrasonic time of 39 min, the yield of the polysaccharides is 11.72 ± 0.05%. RPP with average molecular weight (Mw) of 59 300 Da is composed of six monosaccharides. Nuclear magnetic resonance (NMR) analyses confirmed that RPP contains six main glycosidic linkages including α‐l‐Araf‐(1→, →2)‐α‐l‐Rhap‐(1→, →4)‐β‐d‐Manp‐(1→, →4)‐α‐d‐GalAp‐(1→, →3)‐β‐d‐Galp‐(1→, →4)‐β‐d‐Glcp‐(1→. RPP exhibits remarkable protective effects against H2O2‐induced erythrocyte hemolysis, the generations of reactive oxygen species, and malondialdehyde are inhibited, and the activities of glutathione peroxidase and catalase are effectively enhanced. The current findings proved that UAATPE is an effective method to extract the polysaccharide from raspberry pomace and provides a new idea for the utilization of nutrient‐rich raspberry fruit residue.

The Influence of Coaxial Ultrasound on the Droplet Transfer of High Nitrogen Steel GMAW Process

The nitrogen bubble bursting phenomenon during the welding process of high nitrogen steel (HNS) can lead to unstable droplet transfer and welding process, reducing the quality of weld formation. In this study, a novel approach, ultrasonic-assisted gas metal arc welding (U-GMAW), is proposed to suppress the escape of nitrogen gas during droplet transfer. This study investigates the influence of ultrasound on the metal transfer process during two distinct metal transfer modes: short-circuiting and droplet transfer. Ultrasound has a significant effect on the welding process; as ultrasonic power increases, both the arc length and droplet size decrease, while the droplet transfer frequency increases and the electrical signal stabilizes. Under the experimental conditions of this study, ultrasound has the most effective improvement on the metal transfer behavior when the ultrasonic power reaches 2 kW. Ultrasound enhances the stability of the droplet transfer process, making U-GMAW an effective and novel approach for controlling the droplet transfer behavior of high nitrogen steel.

Mass transfer kinetics of ultrasonic- and vacuum-ultrasonic-assisted static brine of chicken breast (Pectoralis major).

The aim of this study was to investigate the effect of different ultrasound treatment (UT) conditions (Control, UT-150, UT-300, UT-450, Vacuum-UT-150, Vacuum-UT-300, Vacuum-UT-450) on the brining kinetics and meat quality of chicken breast. The results showed that vacuum-ultrasonic-assisted treatment greatly accelerated the transfer of moisture and NaCl, and the highest yield was obtained by ultrasonic power of 450W. The mass transfer kinetics (k1 and k2) were significantly related to vacuum pretreatment and ultrasonic power. The values of k1 for total and moisture weight changes decreased with the increase of ultrasonic power, whereas the values of k2 increased with vacuum pretreatment. The application of ultrasound treatment with vacuum improved the NaCl effective diffusion coefficients (De) from 1.189×10-9 to 1.308-1.449×10-9 m2/s, and the highest De was found with Vacuum-UT-450. The treatment of ultrasound and vacuum can reduce shear force and enhance the water-holding capacity (WHC). According to the analysis of water distribution, vacuum and ultrasound could decrease the T23 values, indicating that the mobility of water decreased. The result of microscopic observation further supported that the disruption of myofibrils was related to the tenderness and WHC changes, which was caused by vacuum and ultrasound treatment. Thus, Vacuum-UT brining could be employed as an emerging technology for improving the efficiency of brining and meat quality of other meat. PRACTICAL APPLICATION: Vacuum-ultrasonic-assisted static brine is an effective and feasible treatment to replace tumbling treatment for maintaining the integrity of the muscle bundles and accelerating the brining rate.

Preparation of DOX-TPP/HA-ss-OA Nanoparticles, Investigation of Drug Release Behavior In Vitro, and Evaluation of Anti-proliferative Activity In Vitro.

This study aimed to develop and characterize DOX-TPP/HA-ss-OA nanoparticles, utilizing the mitochondria-targeting prodrug doxorubicin-triphenylphosphine (DOXTPP) and a reduction-sensitive amphiphilic polymer, hyaluronic acid-disulfide-oleic acid (HAss- OA). The research focused on evaluating the drug release behavior of these nanoparticles under varying glutathione (GSH) concentrations and their anti-tumor activity in vitro. DOX-TPP/HA-ss-OA nanoparticles were prepared using probe ultrasound technology. The study examined the impact of different organic solvents on drug loading capacity and encapsulation efficiency to determine the optimal conditions. A single-factor experimental design was used to optimize the formulation process. Key parameters, including particle size and zeta potential, were measured to assess nanoparticle stability and performance. The dynamic dialysis method was employed to evaluate the reduction-sensitive drug release characteristics in media with different GSH concentrations. The MTT assay was used to analyze the growth-inhibitory effects of the nanoparticles on human breast cancer cells (MCF-7) and drug-resistant cells (MCF-7/ADR). The optimized preparation process for DOX-TPP/HA-ss-OA nanoparticles included a drug dosage of 2.0 mg, an oil-to-water volume ratio of 1:5, ultrasonic power of 500 W, and ultrasonic time of 15 minutes. The nanoparticles had an average particle size of 203.72 ± 2.30 nm and a zeta potential of 25.82 ± 0.58 mV, indicating favorable stability and effective drug delivery properties. The nanoparticles exhibited a slow, sustained release of DOX-TPP in pH 7.4 phosphate buffer solution (PBS) and accelerated release in high GSH concentrations, demonstrating reduction-responsive drug release. In vitro studies showed that DOX-TPP/HA-ss-OA nanoparticles significantly inhibited the proliferation of MCF-7 and MCF-7/ADR cells in a dosedependent manner, with enhanced efficacy compared to free DOX and other formulations. DOX-TPP/HA-ss-OA nanoparticles demonstrate excellent reduction sensitivity, effective tumor cell growth inhibition in vitro, and the ability to overcome drug resistance. Including particle size and zeta potential measurements supports their suitability as drug carriers, highlighting their potential for targeted cancer therapy and further development.

Ultrasonic-assisted DES extraction optimization, characterization, antioxidant and in silico study of polysaccharides from Angelica dahurica Radix

In this study, polysaccharides from Angelica dahurica Radix (ADR) were extracted by using ultrasonic-assisted deep eutectic solvent (DES) extraction method. The DES consist of choline chloride (HBA, hydrogen bonding acceptor) and 1, 4-butanediol (HBD, hydrogen bonding donor) with the molar ratio of 1:3 was proved as the best system for polysaccharides extraction. A Box-Behnken design with three factors and three levels was utilized to optimize ultrasonic power, extraction time and temperature for increased polysaccharides yield. The optimal extraction parameters were determined as follows: DES water content of 20 %, liquid–solid ratio of 10:1 mL/g, ultrasonic time of 21 min, temperature at 60 °C, and ultrasonic power of 435 W. These conditions yielded an extraction rate nearly matching the theoretical predicted value of the response surface model, surpassing the traditional hot water extraction method by 1.33 times and requiring less time. The antioxidant polysaccharides was assessed using DPPH,ABTS and Hydroxyl methods, which indicated that ADRP extracted by ultrasound assisted DES had excellent antioxidant capacity and showed a dose–response relationship with drug concentration. Structural analysis identified ADR polysaccharides as a heteropolysaccharide rich in sugar aldonic acids—namely, fucose, rhamnose, arabinose, galactose and glucose—with molar ratios of 0.47:1.99:17.61:64.76:15.17. The polysaccharides’ number-average molecular weight was determined to be 97.422 kDa, with a weight-average molecular weight of 245.678 kDa. Network pharmacology and molecular docking analysis suggest that the monosaccharides Rha and Ara could potentially interact with the proteins GSR and GSTA1, respectively, indicating that ADRP had good antioxidant potential and could be applied in multiple fields with promising development prospects in the future.

Preparation of CuWO4/Bi2WO6 composite and its sonocatalytic removal of tetracycline by combined persulfate

In this study, CuWO4/Bi2WO6 composites were prepared by the one-pot method and characterized. The sonocatalytic performance of the CuWO4/Bi2WO6 composites was investigated using tetracycline (TET) as a model of organic pollutant, in which the best catalytic performance was achieved by CB-10. When the addition of CB-10 was 1.0 g/L, the ultrasonic power was 500 W, the concentration of TET was 20 mg/L, and the addition of K2S2O8 was 2.7 g/L, the removal rate of TET was achieved 98.77 ± 1.55% after 60 min of ultrasonic irradiation time. The results indicated that the construction of CuWO4/Bi2WO6 Type-II heterojunction could effectively separate the e--h+ pairs generated in the CuWO4/Bi2WO6 composite during the sonocatalytic process, which could significantly enhance the sonocatalytic performance of Bi2WO6. The combination of this sonocatalytic system and K2S2O8 could effectively remove TET. The results of the present paper provide a good basis for the development of novel sonocatalysts and the practical application of sonocatalytic degradation technology in pharmaceutical wastewater purification.

Study on ultrasonic-assisted lapping performance and material removal behavior of diamond/SiC composites

Diamond/SiC composites have emerged as a new generation of highly promising materials for semiconductor packaging due to their excellent thermal conductivity. However, the exceptionally hard diamond and SiC phases in the composites have made precision machining a substantial difficulty. This study specifically explores the utilization of ultrasonic-assisted lapping (UAL) to enhance the machining performance of diamond/SiC composites. The focus is on investigating the effects of UAL on the material removals, including the brittle-ductile transition of sample interfacial diamond at different ultrasonic conditions, as well as the surface morphology of diamond/SiC composites. The removal mechanism of diamond/SiC composites under different machining conditions and the transient impact action of the abrasive were systematically analyzed, taking into account the abrasive size, the mechanical effects of ultrasonic vibration, and the interplay of processing parameters. The experimental results reveal that UAL significantly changes the traditional removal mode of diamond/SiC composites. At a constant rotational speed, the diamond abrasive size in the lapping solution exerts the primary influence on the sample surface morphology, followed by the average power of ultrasonic. Compared to conventional lapping methods, UAL improves the removal rate by 10.3 %, 5.4 %, and 5.3 % for abrasive sizes of 8 μm, 4 μm, and 1 μm, respectively. Optimally, the best surface quality finish of diamond/SiC composites was achieved with a lapping solution containing 4 μm abrasive particles and an average ultrasonic vibrator power of 75 W. This study underscores the potential of UAL to enhance the efficiency and quality of diamond/SiC composite machining.

Ultrasound treatment on commercial pea protein isolates systems: Effect on structure, rheology and gelling properties

Pea protein has attracted great attention due to its capability to meet the growing requirements from consumers for desired nutrition and texture from plant protein. Hence, the current study aimed to investigate the effects of different ultrasonic treatment parameters (power and duration) on the gelling characteristics of commercial pea protein isolates (PPIc). The findings demonstrated that by manipulating the ultrasonic power and treatment duration, great enhancement of the solubility, adhesiveness and formation strength of PPIc gel can be realized. The reduction in particle size was positively correlated with higher power and longer treatment durations. Interestingly, no direct correlation between average particle size, solubility, turbidity, and ζ-potential was observed. Additionally, the ultrasound-modified PPIc in this study exhibited comparable characteristics to laboratory-prepared pea protein isolates, in terms of solubility, water-holding capacity, and gel strength. Overall, manipulating ultrasonic parameters presents a feasible method to customize the texture of pea-protein-based substitute.

Study on 13C MultiCP/MAS ssNMR Analysis of Tobacco Pectin

Background: As one of the most important economic crops, tobacco products have a long history and dominate the development of the world economy. Pectin, as a complex colloidal substance widely present in plant cell walls, its content is an important factor affecting the safety of tobacco smoking. Objective: This study aimed to analyze the content and structure of pectin in tobacco samples Methods: In this study, tobacco pectin was extracted by ultrasonic-assisted ionic liquid extraction, and the 13C MultiCP/MAS NMR spectral analysis of pectin was conducted. Results: The type of extractant, duration of ultrasonication, extraction temperature, and solid-liquid ratio were optimized. Under the conditions of using 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) as the extractant, the solid-liquid ratio of 1:20 g/mL, and the ultrasonic power of 600 w for 30 min at 30°C, the yield of 23.7% of tobacco stem pectin and the purity of 54.2% could be obtained. The optimized MultiCP sequence parameters, with 10 CP cycles of 1.0 ms and the repolarization time of 50 ms could obtain high-resolution spectra within a time of 1.0 h. The C-6 peaks of the pectin in spectra were fitted using the spectral deconvolution technique and calculated the methylesterification (DM) of the tobacco pectin, which was generally less than 50% and belonged to the low methyl esterification pectin. The pectin content of the tobacco sample was calculated using the standard curve method with the addition of dimethyl sulfone (DMS) as an internal reference. The results of this method were consistent with the colorimetric method. Conclusion: The 13C MultiCP/MAS NMR method has the advantages of being green, fast, and accurate and provides a new technical tool for quantitative and qualitative studies of cell wall substances in tobacco samples.

Ultrasound-cellulase synergy for the extraction of total flavonoids from Astragali complanati Semen and its antioxidant properties

The present study was conducted to optimize ultrasound-cellulase synergy extraction (UCSE) process of flavonoids from Astragali complanati Semen (ACS) adopting response surface methodology (RSM). The extraction efficiency of different extraction progress by UCSE under the 240 W and 480 W were compared, and the antioxidant activities were evaluated in vitro. The effects of five independent variables (cellulase addition, liquid-solid ratio, extraction time, extraction temperature, and ultrasonic power) on the extraction efficiency were explored, and four major factors (cellulase addition, liquid-solid ratio, extraction temperature and ultrasonic power) showing great influences were chosen to study their interactions by RSM. The relationships between ultrasound power 240 W and 480 W on substrates and cellulase were further explored by scanning electron microscopy and 3,5-dinitrosalicylic acid (DNS) method, respectively. The antioxidant activities on 1,1-diphenyl-2-picryl-hydrazyl radical (DPPH) and 2,2′-azinobis-(3-ethylbenzthiazoline-6-sulphonate) radical (ABTS+) were evaluated in vitro. The optimal conditions: cellulase addition 930 U/g, liquid-solid ratio 24 mL/g, extraction time 75 min, extraction temperature 64°C and ultrasonic power 234 W, under the adjusted conditions, the extraction rate was 1.937 g/100 g ACS. Ultrasound power 240 W assisted extraction with cellulase improved the extraction efficiency of the antioxidant. From scanning electron microscopy, the substrate particles were finer and the pores were larger under the function of 240 W, and the enzyme activity test further determined that 480 W could reduce the effect of the cellulase. The UCSE extract exhibited great antioxidant activity in vitro, the IC50 of DPPH is 11.851 µg/mL, and of ABTS+ is 23.426 µg/mL.

Delaminated structure of Zn-doped TiO2 coatings induced by ultrasound-auxiliary micro-arc oxidation: the influence of ultrasonic power

In this study, two representative ultrasonic vibration (UV) methods were employed to fabricate Zn-doped TiO2 micro-arc oxidation (MAO) ceramic coatings with enhanced corrosion resistance on pure Ti substrate. On the one hand, the surface morphology and chemistry of the coatings are characterized as partially crystallized hydroxyapatite nanoparticles and amorphous bands rich in Ca, P, Zn, and O. On the other hand, the MAO-modified coatings exhibit much greater corrosion resistance than the bare Ti surfaces, showing a reduction in corrosion current density (icorr) by at least an order of magnitude. However, a key finding is that a lower UV power setting of 360 V (named as the TZ-optimized protocols here) surpasses the higher 900 V (named as the TZ-powerful protocols) in terms of corrosion resistance (i.e. icorr =∼1.47×10−8 A/cm2 vs ∼7.85×10−7 A/cm2, respectively) as well as adhesion strength to the substrate (the critical load of ∼6.4 N vs ∼2.9 N, respectively), which can be attributed to the delaminated structure formed at higher UV powers. This work is expected to remind the potential side effect of such delamination in ceramic coatings produced by UV-assisted MAO processes on Ti-based alloys.

Enhancing Antioxidant Activity from Aquatic Plant Cymodocea nodosa for Cosmetic Formulation Through Optimized Ultrasound-Assisted Extraction Using Response Surface Methodology

This study aimed to enhance antioxidant extraction from the aquatic plant Cymodocea nodosa for cosmetic formulation through optimized ultrasound-assisted extraction using response surface methodology. The optimized conditions—30 min of extraction time, 30% ultrasonic power, and 25% hydro-ethanolic solvent—resulted in a high total phenolic content of 113.07 mg EAG/g DM and antioxidant activity of 67.02%. Chromatographic analysis revealed a rich profile of phenolic compounds, including sinapic acid (0.741 mg/g), myricetin (0.62 mg/g), and quercetin-3-O-rutinoside (0.3 mg/g), demonstrating the extract’s potent therapeutic properties. While the extract exhibited limited anti-inflammatory activity, it showed no cytotoxic effects on RAW 267.4 cells, ensuring its safety for cosmetic applications. The formulated cream maintained stable pH (6.58 to 6.6), consistent viscosity (5966.38 to 5980.6 cp), and minimal color changes over a 30-day period, indicating robust stability across various temperatures (4 °C, 25 °C, and 40 °C). These results confirm the potential of C. nodosa extracts to develop effective, stable, and eco-friendly cosmetic products, offering substantial benefits for skin health and emphasizing the importance of sustainable extraction processes in the cosmetics industry.

2,4-Dinitrotoluene (DNT) Removal Efficiency Using the Sono-photo-fenton Process Combined with Nano Zero Valent Iron (nZVI) Heterogeneous Catalysis

2,4-Dinitrotoluene (DNT) is a highly toxic compound of nitrotoluene group causing negative impacts on mammals, fish, and human health that needs to be treated before discharging. The study aimed to evaluate the affecting factors on efficiency of DNT treatment by Sono-Photo-Fenton process using zero-valent iron catalysts (nZVI), including: pH, intial DNT concentration, nZVI catalyst concentration, hydrogen peoxide concentration, light power, and ultrasonic power. After 20 minutes of Sono-Photo-Fenton reaction, the DNT removal efficiency was 100% with optimal operating conditions as following: pH=3.0, CDNT = 50 mg/L, CH2O2 = 20 mM, CnZVI = 1 mM, UV power of 10 W, ultrasonic power of 80 W.

Performance evaluation of ultrasonic-assisted dynamic ice melting in ice storage systems: An experimental study

This study presents the construction of an ice storage tank equipped with an internal ice-on-coil system. The cooling performance of the ice storage system is enhanced by utilizing the cavitation phenomenon induced by ultrasonic vibration in water. Active water circulation and spraying within the tank enhance cooling efficiency by promoting uniform temperature distribution. An analysis is conducted on the impact of various operating parameters, such as output powers of 200 W, 400 W, and 584 W, frequencies of 40 kHz, 80 kHz, and 120 kHz, and three different placements of the oscillator, on the cooling performance of ultrasonic-assisted static ice melting, dynamic ice melting, and ultrasonic-assisted dynamic ice melting systems. Ultrasonic-assisted static ice melting refers to ice melting with stationary water, while ultrasonic-assisted dynamic ice melting involves water circulation, enhancing heat transfer. The study examines performance indicators like instantaneous cooling rate, cumulative cooling capacity, average cooling rate, melting time, and heat gain by the system. The findings indicate that higher ultrasonic power levels enhance the average cooling rate and reduce the melting time by approximately 50 % and 32.2 %, respectively. However, the frequency does not have a significant effect on the cooling performance. In addition, the ice storage system had a significant increase in cooling rate of 294.87 % when utilizing the ultrasonic-assisted dynamic ice melting system. Furthermore, the melting time was lowered by 71 % in comparison to the static ice melting method. Of all the parameters, the power parameter has the greatest impact. The impact of the ultrasonic oscillator placement parameter is secondary, while the influence of the frequency parameter on the cooling performance is not significant.

Ultrasonic Treatment of Soybean Protein Isolate: Unveiling the Mechanisms for Gel Functional Improvement and Application in Chiba Tofu.

Soybean protein isolate (SPI) cannot meet the needs of modern food production due to various shortcomings. By change of its structural characteristics, its application in the food field may be increased. This study explored the impact of ultrasonic treatment on the structural and gelation properties of the SPI dispersions. By subjecting SPI to ultrasonic treatment at 0-800 W for 10 min, it was found that this treatment significantly reduced the particle size of SPI to 196 nm and caused an increase in its solubility, surface hydrophobicity, and sulfhydryl content as well as significant changes in the protein structure. At an optimal ultrasonic power of 200 W, SPI gels demonstrated an enhanced gelling ability, strength, and water-holding capacity, forming a more uniform and compact structure. Application in Chiba tofu showed that water retention, elasticity, and sensory quality were optimized at 200 W. The findings highlight that a sonication power of 200 W significantly improves the physicochemical and structural properties of SPI, resulting in a denser and more functional gel suitable for Chiba tofu production.

Optimization of White Tea Flavanol Extraction Process by the Ultrasonic‐Assisted Deep Eutectic Solvent Method and Determination of the Antioxidant and Antibacterial Activity

ABSTRACTFlavanols have a variety of health benefits and biological activities and become the hotspot of the food development and research. In this research, flavanols were extracted from white tea by ultrasonic‐assisted deep eutectic solvent (DES) method. High‐performance liquid chromatography was used to determine the content of flavanols. The influence of four factors on the flavanol extraction yield was analyzed by single factor experiments, including deep eutectic solvent mole ratio (the mole of hydrogen bond acceptors: the mole of hydrogen bond donors), solid–liquid ratio (white tea sample weight/g: the volume of DES/mL), extraction time and extraction temperature. On the basis of single factor experiments, the factors which had significant effects on the flavanol extraction yield were further optimized by the response surface test. The results showed that the optimized extraction conditions were as follows: the mole ratio of DES 1: 4 (choline chloride: 1,2‐propanediol), the solid–liquid ratio 1:30, the extraction temperature 56°C, the extraction time 53 min, and the ultrasonic power 341 W. Under the above parameters, the extraction yield of white tea flavanols was 9.63 mg/g. After purification with macroporous resin, antioxidation and antibacterial experiments were carried out. The results showed that the antioxidant and antibacterial effects of white tea flavanols were remarkable. The antibacterial effects performed best on Escherichia coli, followed by Bacillus subtilis and Staphylococcus aureus. The maximum diameter of the antibacterial zone on Escherichia coli was 0.95 ± 0.11 mm. The best radical scavenging rates of OH, ABTS+ and DPPH were 97.1%, 97.5%, and 88.4%, respectively, when the flavanol concentration was 9.5 mg/mL. The conclusions of this research can provide theoretical foundation for the further study of white tea flavanols.

Influence of ultrasonic assistance on the microstructure and friction properties of laser cladded Ni60/WC composite coatings

The effects of different ultrasonic vibration powers on the distribution, phase structure, friction and wear properties of WC reinforced particles in laser melted Ni60/WC composite coatings are investigated. The effects of ultrasonic vibration on the microstructure, elemental distribution, crystal orientation, friction and wear properties of the fused coatings are analyzed. The experimental results show that the deposition of WC particles in the lower and middle parts of the coating is significantly improved after the introduction of ultrasonic vibration during the fusion cladding process. In particular, at 600 W ultrasonic power, not only the distribution uniformity of tungsten carbide particles in the coating is optimal, but also the composite coating shows better wear resistance. However, too much ultrasonic power increases the possibility of particle agglomeration. In addition, although the phase pattern of the coating does not change after ultrasonic vibration, the width of the columnar crystalline region of the coating is reduced, and the coating is covered by a homogeneous lamellar nanoscale eutectic structure with the phase compositions of the γ-(Fe, Ni) and M23C6 phases. The ultrasonic vibration improves elemental segregation of the coating, reduces the large number of precipitated phases in the coating, weakens the grain growth orientation, and relieves the local stress concentration in the coating. In addition, the mechanism of the influence of WC particles on the microstructure evolution and wear resistance of the composite coatings is discussed.

Study of the effect of ultrasonic technology on the extraction of bitumen from bituminous rocks

Background: Nowadays, there are few studies focused on the extraction of targeted products from bituminous rocks. Published research on the on the use of ultrasound for bitumen extraction refers to unconventional technologies. A distinctive feature of the bituminous rocks under study is their exposure at the surface, where they are situated in open areas. Due to various technogenic factors and prolonged atmospheric, light fractions are lost, while the heavier components undergo oxidation. These processes lead to the formation of heavy oils and hard bitumens with complex composition. Aim: To study the effect of ultrasonic technology on the bitumen extraction of from bituminous rocks and to determine the physical and chemical properties of the product obtained. Materials and methods: Thу ultrasonic method has many benefits, in particular energy and water savings, high productivity within a short period of time, and possibility of organizing a mobile unit installation at the production site. The main process parameters includes the determination of the required frequency and power depending on the object of ultrasound technology research. The results of the work have demonstrated that ultrasonic cavitation of bituminous rocks in an alkaline medium increases the degree of bitumen extraction. Results: The physical and chemical properties of bitumen obtained as a result of studying the effect of ultrasonic technology on bitumen extraction from oil-bituminous rocks were determined. Conclusion: The study identified the optimal process parameters based on the specific research object. When selecting the ultrasonic power it was found that clay compounds of bituminous rocks have a direct effect on the extraction of natural bitumen. It was demonstrated that ultrasound technology is a promising and industrially applicable technology for extracting bitumen from the bituminous rocks of the Munaily Mola field.

Optimization of Ultrasonic Extraction, Functional Properties, and Antioxidant Activity of Naematelia aurantialba Polysaccharides

AbstractNaematelia aurantialba (N. aurantialba) is a fungus rich in polysaccharides with medicinal and edible properties. Polysaccharides are the main active components of N. aurantialba; however, their biological activities and functional properties have not been widely explored. In this study, the ultrasonic extraction process for N. aurantialba polysaccharides (NAP) is optimized, and the physicochemical, functional, and antioxidant activities of the homogeneous fraction (NAP) are investigated. The optimal extraction conditions are a liquid–solid ratio of 50 mL g−1, ultrasonic power of 430 W, ultrasonic time of 32 min, resulting in an extraction rate of N. aurantialba polysaccharides of 48.68% ± 0.83%. NAP has a molecular weight of 915 kDa. The monosaccharide composition of NAP is as follows: mannose (59.04% ± 0.12%), xylose (23.89% ± 0.03%), glucuronic acid (14.07% ± 0.24%), galacturonic acid (2.12% ± 0.02%), and glucose (0.76% ± 0.02%). NAP exhibites water and oil retention capacities of 14.62 ± 0.25 g g−1 and 23.73 ± 0.85 g g−1, respectively. Furthermore, NAP demonstrates favorable moisture absorption and retention properties. The results show that NAP has a significantly stronger antioxidant effect, as demonstrated by its concentration‐dependent scavenging of ABTS, DPPH, and hydroxyl radicals.

Recovery of Selenium-Enriched Polysaccharides from Cardamine violifolia Residues: Comparison on Structure and Antioxidant Activity by Different Extraction Methods.

The residues from selenium-enriched Cardamine violifolia after the extraction of protein were still rich in polysaccharides. Thus, the recovery of selenium polysaccharides (SePSs) was compared using hot water extraction and ultrasonic-assisted extraction techniques. The yield, extraction rate, purity, specific energy consumption, and content of total and organic selenium from different SePS extracts were determined. The results indicated that at conditions of 250 W (ultrasonic power), 30 °C, and a liquid-to-material ratio of 30:1 extracted for 60 min, the yield of SePSs was 3.97 ± 0.07%, the extraction rate was 22.76 ± 0.40%, and the purity was 65.56 ± 0.35%, while the total and organic selenium content was 749.16 ± 6.91 mg/kg and 628.37 ± 5.93 mg/kg, respectively. Compared to traditional hot water extraction, ultrasonic-assisted extraction significantly improves efficiency, reduces energy use, and boosts both total and organic selenium content in the extract. Measurements of particle size, molecular weight, and monosaccharide composition, along with infrared and ultraviolet spectroscopy, revealed that ultrasonic-assisted extraction breaks down long-chain structures, decreases particle size, and changes monosaccharide composition in SePSs, leading to lower molecular weight and reduced dispersity. The unique structure of SePSs, which integrates selenium with polysaccharide groups, results in markedly improved antioxidant activity and reducing power, even at low concentrations, due to the synergistic effects of selenium and polysaccharides. This study establishes a basis for using SePSs in functional foods.