Ultrasonics Sonochemistry最新文献_第10页

Numerical investigation of three-dimensional effects of hydrodynamic cavitation in a Venturi tube 文丘里管内流体动力空化三维效应的数值研究

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-30 DOI: 10.1016/j.ultsonch.2024.107122

Dhruv Apte , Mingming Ge , Guangjian Zhang , Olivier Coutier-Delgosha

Hydrodynamic Cavitation (HC) is a highly turbulent, unsteady, multi-phase flow that has been useful in many processing applications like wastewater treatment and process intensification and hence needs to be studied in detail. The aim of this study is to investigate the mechanisms driving HC inside a Venturi tube using numerical simulations. The numerical simulations are conducted in the form of both two-dimensional (2D) and three-dimensional (3D) simulations using the Detached Eddy Simulation (DES) model database to simulate the cavitation–turbulence interplay, and the results are validated against high-fidelity experimental data. Initial 2D calculation results show that though URANS models are able to show unsteady cavitation, they are unable to reproduce the correct cavity morphology while the DES models reproduce the cavity morphology accurately. After extending to 3D simulations and the resulting vorticity budget analysis highlight the cavitation–vortex interactions and show the domination of velocity gradients and the growth and shrinking of the fluid element terms over the baroclinic torque for vortex production. Finally, localized scale comparisons are conducted to evaluate the model’s ability to simulate the cavitation–turbulence interaction. It is observed that the 3D DES simulations are able to predict accurately the cavitation–turbulence interaction on a localized scale for turbulence properties like Reynolds shear stress and Turbulent Kinetic Energy (TKE), emphasizing the 3D effects of turbulence and their influence on the cavitating flow. However, significant discrepancies continue to exist between the numerical simulations and experiments, near the throat where the numerical simulations predict a thinner cavity. Therefore, this study offers new insights on simulating HC and highlights the bottleneck between turbulence model development and accurate simulations of HC to provide a reference for improving modeling accuracy.

流体动力空化（HC）是一种高度湍流、非稳定的多相流，在废水处理和工艺强化等许多加工应用中都非常有用，因此需要对其进行详细研究。本研究的目的是通过数值模拟研究文丘里管内碳氢化合物的驱动机制。数值模拟以二维（2D）和三维（3D）模拟的形式进行，使用分离涡模拟（DES）模型数据库来模拟空化-湍流的相互作用，并将结果与高保真实验数据进行验证。最初的二维计算结果表明，虽然 URANS 模型能够显示非稳态空化，但无法再现正确的空腔形态，而 DES 模型则能准确再现空腔形态。在扩展到三维模拟后，涡度预算分析突出了空化与涡流的相互作用，并表明速度梯度和流体元素项的增长和收缩比产生涡流的巴氏力矩更重要。最后，进行了局部尺度比较，以评估模型模拟空化-湍流相互作用的能力。结果表明，对于雷诺剪应力和湍流动能（TKE）等湍流特性，三维 DES 模拟能够在局部尺度上准确预测空化与湍流的相互作用，强调了湍流的三维效应及其对空化流的影响。然而，数值模拟和实验之间仍然存在巨大差异，在喉部附近，数值模拟预测的空腔更薄。因此，本研究为模拟碳氢化合物提供了新的见解，并强调了湍流模型开发与精确模拟碳氢化合物之间的瓶颈，为提高建模精度提供了参考。

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引用次数: 0

Ultrasound-assisted extraction of triterpenoids from Chaenomeles speciosa leaves: Process optimization, adsorptive enrichment, chemical profiling, and protection against ulcerative colitis 超声波辅助提取Chaenomeles speciosa叶片中的三萜类化合物：工艺优化、吸附富集、化学分析以及对溃疡性结肠炎的保护。

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-30 DOI: 10.1016/j.ultsonch.2024.107136

Mengyang Hou , Jingchun Shi , Chengyuan Lin , Lin Zhu , Zhaoxiang Bian

For the valorization of Chaenomeles speciosa leaves, this study focused on extraction, enrichment, chemical profiling, and investigation of the biological activity of its abundant triterpenoid components. Initially, the total triterpenoids in C. speciosa leaves were extracted by ultrasonic-assisted extraction (UAE) method, with the extraction process optimized through response surface methodology (RSM). Under the optimal conditions of extraction solvent 93 % EtOH, ultrasound power 390 W, extraction time 30 min, extraction temperature 70 °C, liquid-to-solid ratio 25 mL/g, and 2 extraction cycles, the maximum total triterpenoids yield (TTY) reached 36.77 ± 0.40 mg/g. The total triterpenoids in the crude extract were subsequently enriched by X-5 resin column chromatography, resulting in a fourfold increase in purity, reaching 73.27 ± 0.84 %. Thirteen compounds in the triterpenoid-rich fraction (TRF) were identified through UPLC–QTOF-MS/MS, and five major triterpenoids (oleanolic acid, ursolic acid, betulinic acid, maslinic acid, and pomolic acid) were simultaneously quantified by HPLC–QQQ-MS. Furthermore, TRF demonstrated a notable amelioration against dextran sodium sulfate (DSS)-induced ulcerative colitis in mice, indicating its promise as a potent intervention for this condition. In summary, this study will contribute to enhancing the utilization efficiency of Chaenomeles speciosa leaves.

为了提高Chaenomeles speciosa叶片的价值，本研究重点对其丰富的三萜类成分进行了提取、富集、化学分析和生物活性研究。首先，采用超声波辅助萃取法（UAE）提取了Chaenomeles speciosa叶片中的总三萜类化合物，并通过响应面方法（RSM）对萃取过程进行了优化。在萃取溶剂为 93 % EtOH、超声功率为 390 W、萃取时间为 30 min、萃取温度为 70 ℃、液固比为 25 mL/g、萃取循环次数为 2 次的最佳条件下，三萜类化合物总收率（TTY）达到 36.77 ± 0.40 mg/g。随后，粗提取物中的总三萜类化合物经 X-5 树脂柱层析富集，纯度提高了四倍，达到 73.27 ± 0.84 %。通过 UPLC-QTOF-MS/MS，鉴定出富含三萜类化合物的馏分（TRF）中的 13 种化合物，并同时通过 HPLC-QQQ-MS 对五种主要的三萜类化合物（齐墩果酸、熊果酸、白桦脂酸、马斯林酸和坡莫林酸）进行了定量。此外，TRF 对右旋糖酐硫酸钠（DSS）诱导的小鼠溃疡性结肠炎有显著的改善作用，这表明它有望成为一种有效的干预措施。总之，这项研究将有助于提高柴胡叶的利用效率。

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引用次数: 0

Multi-frequency power ultrasound (MFPU) pretreatment of crayfish (Procambarus clarkii): Effect on the enzymatic hydrolysis process and subsequent Maillard reaction 多频功率超声（MFPU）预处理小龙虾（Procambarus clarkii）：对酶水解过程和随后的 Maillard 反应的影响。

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-30 DOI: 10.1016/j.ultsonch.2024.107140

Weiqiang Yan , Zhijun Chen , Chao Zhang , Yao Xu , Chang Han , Ling Yue , Qiulian Kong , Qi Zheng , Wenhui Tian , Baoguo Xu

Crayfish, as a new consumer trend, has become one of the most popular freshwater aquatic foods in China, and its processed product output has been increasing year by year. In this study, the effect of multi-frequency power ultrasound (MFPU) pretreatment in various working modes including mono-, dual- and tri-frequency on the enzymatic hydrolysis and Maillard reaction of crayfish was investigated. Additionally, the underlying mechanism was also explored. Results showed that the degree of hydrolysis (DH) of crayfish was 23.89 %, while it increased to 40.78 % after MFPU pretreatment at 20/40 kHz dual-frequency, indicating that MFPU pretreatment significantly (p < 0.05) enhanced the enzymatic hydrolysis of crayfish. The crayfish protein after MFPU pretreatment exhibited a decrease in α-helix and increase in β-fold content, and the occurrence in the unfolding of the protein structure and alteration of tertiary structure. According to scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses, the MFPU pretreatment resulted in the fragmentation of crayfish protein. During the analyses of subsequent Maillard reaction, the composition and quantity of volatiles detected by the electronic nose and GC–MS indicated that MFPU pretreatment enhanced flavor of the Maillard reaction products. In conclusion, MFPU pretreatment is a promising technology for improving the degree of hydrolysis of crayfish protein and enhancing the flavor of Maillard reaction products.

小龙虾作为一种新的消费趋势，已成为中国最受欢迎的淡水水产食品之一，其加工产品的产量也在逐年增加。本研究探讨了单频、双频和三频等不同工作模式的多频功率超声（MFPU）预处理对小龙虾酶水解和马氏反应的影响。此外，还探讨了其潜在机理。结果表明，小龙虾的水解度（DH）为 23.89%，而在 20/40 kHz 双频下进行 MFPU 预处理后，小龙虾的水解度（DH）增加到 40.78%，表明 MFPU 预处理显著（p

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引用次数: 0

Ultrasound effect on flavor profile of beef jerky produced with partial potassium salt substitute based on GC-IMS technology 基于 GC-IMS 技术的超声波对使用部分钾盐替代品生产的牛肉干风味的影响

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-30 DOI: 10.1016/j.ultsonch.2024.107139

Jian Zhang , Lei Jin , Jianjun Zhou , Chao Ma , Jie Cui , Jinchi Jiang , Wenhui Li , Si Wu , Wangang Zhang , Yonghong Hu

Traditional beef jerky contains a high content of sodium salt while the reduction of sodium usage impairs the flavor of final product. Regarding above issues, this research innovatively applied ultrasound-assisted salts (NaCl and KCl) recombination in the pickling stage of low-sodium beef jerky, and further compared the flavor differences caused by ultrasound by sensory evaluation, E-nose and GC-IMS. Besides, the changes of physicochemical qualities were explored including salts content, color and shear force. Results showed that ultrasound had positive impacts on flavor quality. The 400 W treatment was chosen as an optimal group for flavor improvement which was mainly related with the increased level of 5 aldehydes (nonanal, 3-methylbutanal, heptanal, pentanal and octanal) and the decreased level of 3 ketones (2-butanone, 2-pentanone and 2,3-pentanedione). Simultaneously, ultrasound increased the redness and tenderness of final product. Thus, ultrasound is a promising approach for improving the flavor of low-sodium beef jerky.

传统牛肉干钠盐含量较高，而减少钠盐用量会影响最终产品的风味。针对上述问题，本研究创新性地在低钠牛肉干的腌制阶段应用了超声波辅助盐分（NaCl 和 KCl）重组，并通过感官评价、电子鼻和气相色谱-质谱联用仪进一步比较了超声波造成的风味差异。此外，还探讨了理化质量的变化，包括盐含量、颜色和剪切力。结果表明，超声波对风味质量有积极影响。选择 400 W 处理为最佳风味改善组，这主要与 5 种醛（壬醛、3-甲基丁醛、庚醛、戊醛和辛醛）含量的增加和 3 种酮（2-丁酮、2-戊酮和 2,3-戊二酮）含量的减少有关。同时，超声波增加了最终产品的红度和柔软度。因此，超声波是改善低钠牛肉干风味的一种可行方法。

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引用次数: 0

Circulation process of methyl ester production from pretreated sludge palm oil using CaO/ABS catalytic static mixer coupled with an ultrasonic clamp 使用 CaO/ABS 催化静态混合器和超声波夹钳从预处理过的污泥棕榈油中生产甲酯的循环过程。

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-30 DOI: 10.1016/j.ultsonch.2024.107138

Kritsakon Pongraktham, Krit Somnuk

This study investigates the potential of fused deposition modeling (FDM) three-dimensional (3D) printing techniques for manufacturing catalytic static mixers during biodiesel synthesis. The printed catalytic mixing elements comprises acrylonitrile butadiene styrene (ABS) plastic with 15 wt% calcium oxide (CaO) as a solid catalyst. When the reactants flowed through the CaO/ABS mixing device, the blending and acceleration processes were both significantly impacted. Moreover, their characteristics, performance in biodiesel production, reusability, and economy were analyzed. The effects of methanol to oil (M:O) molar ratio, circulation time, and sonication time on methyl ester (ME) purity were also examined. The results showed that CaO crystals were distributed on the CaO/ABS mixer’s surface, which is crucial for catalytic purposes. During circulation process of ME from pretreated sludge palm oil (PSPO), catalytic static mixer (CSM) and CSM coupled with ultrasound (CSM/US) reactors were employed. The full ultrasonic power of CSM/US reactor of 16 × 400 W (total 6400 W) was operated at 20 kHz frequency. Moreover, the continuous and pulse ultrasonic modes of CSM/US reactor were compared to determine the ME purity and electricity consumption for ME production. For the CSM reactor, 12:1 M:O molar ratio and 8.5 h circulation time were recommended to realize 94.2 wt% ME purity. For the CSM/US reactor, 12:1 M:O molar ratio and 2.25 h circulation time were recommended to achieve 96.5 wt% ME purity. Under the pulsed mode operation, ME purity of 95.09 wt% was achieved, with a reduction in electricity consumption by approximately 37.6 % compared to continuous mode operation. Furthermore, the CaO/ABS catalytic static mixer was determined to be reusable for up to three cycles in both CSM and CSM/US reactors. Thus, CaO/ABS catalytic static mixers assure high purity ME production through FDM 3D printing technology with a CaO solid catalyst.

本研究探讨了熔融沉积建模（FDM）三维（3D）打印技术在生物柴油合成过程中制造催化静态混合器的潜力。打印出的催化混合元件由丙烯腈-丁二烯-苯乙烯（ABS）塑料和 15 wt%的氧化钙（CaO）作为固体催化剂组成。当反应物流经 CaO/ABS 混合装置时，混合和加速过程都受到了显著影响。此外，还分析了它们的特性、在生物柴油生产中的性能、可重复使用性和经济性。还考察了甲醇与油（M:O）摩尔比、循环时间和超声时间对甲酯（ME）纯度的影响。结果表明，CaO 晶体分布在 CaO/ABS 混合器的表面，这对催化作用至关重要。在从预处理污泥棕榈油（PSPO）中提取甲基丙烯酸酯（ME）的循环过程中，采用了催化静态混合器（CSM）和CSM与超声波耦合反应器（CSM/US）。CSM/US 反应器的全超声功率为 16 × 400 W（总功率为 6400 W），频率为 20 kHz。此外，还对 CSM/US 反应器的连续和脉冲超声模式进行了比较，以确定 ME 的纯度和生产 ME 的耗电量。对于 CSM 反应器，建议采用 12:1 的 M:O 摩尔比和 8.5 小时的循环时间，以实现 94.2 wt%的 ME 纯度。对于 CSM/US 反应器，建议采用 12:1 的 M:O 摩尔比和 2.25 小时的循环时间，以实现 96.5 wt%的 ME 纯度。在脉冲运行模式下，ME 纯度达到 95.09 wt%，与连续运行模式相比，耗电量减少了约 37.6%。此外，还确定 CaO/ABS 催化静态混合器可在 CSM 和 CSM/US 反应器中重复使用长达三个周期。因此，CaO/ABS 催化静态混合器通过 FDM 3D 打印技术和 CaO 固体催化剂确保了高纯度 ME 的生产。

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引用次数: 0

Ultrasonication-mediated synthesis of diblock polymer-based nanoparticles for advanced drug delivery systems: Insights and optimization 超声介导合成二嵌段聚合物纳米颗粒，用于先进的给药系统：见解与优化。

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-29 DOI: 10.1016/j.ultsonch.2024.107137

Nagaraja Sreeharsha , Srikruthi Kunigal Sridhar , Asha Bhuvanahalli Rangappa , Prakash Goudanavar , Purushotham Karadigere Nagaraju , Nimbagal Raghavendra Naveen , Predeepkumar Narayanappa Shiroorkar , Afzal Haq Asif , Girish Meravanige , Krishna Swaroop Duddi Sreehari

This study presents the synthesis and optimization of Methylene polyethyl glycol −Polystyrene (mPEG-PS) Diblock (DIP) copolymer-based solid lipid nanoparticles (SLNs) using ultrasonication for advanced drug delivery systems targeting the human immunodeficiency virus (HIV-1). The mPEG-PS block copolymer was synthesized by ring opening polymerization mechanism under nitrogen atmosphere for 24hrs and characterized using Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy and NMR, confirming the formation of DIP polymers. Optimization of SLNs formulation was achieved through a systematic approach, utilizing response surface methodology, optimal conditions for SLNs synthesis were determined, resulting in nanoparticles with a particle size of 198 nm and an entrapment efficiency of 67.42 %. Cell viability assays, quantitative PCR for viral DNA analysis, caspase-3 enzyme assays, and quantitative uptake studies using High Performance Liquid Chromatography (HPLC) provided quantitative insights into the efficacy and biocompatibility of the synthesized nanoparticles. The experimental data demonstrate that nanoparticle treatments significantly influence cellular responses, providing valuable insights into their therapeutic potential and underlying mechanisms. By employing precise experimental methods alongside rigorous analytical techniques, this study enhances our understanding of nanoparticle-based drug delivery systems, particularly in the context of HIV treatment. These findings pave the way for optimizing therapeutic strategies to improve patient outcomes.

本研究介绍了亚甲基聚乙二醇-聚苯乙烯（mPEG-PS）二嵌段（DIP）共聚物的合成和优化，该共聚物基于超声波，可用于靶向人类免疫缺陷病毒（HIV-1）的先进药物递送系统。mPEG-PS 嵌段共聚物是在氮气环境下通过开环聚合机理经 24 小时合成的，傅立叶变换红外光谱（FTIR）和核磁共振对其进行了表征，证实了 DIP 聚合物的形成。通过系统化方法优化了 SLNs 的配方，利用响应面方法确定了 SLNs 合成的最佳条件，最终得到粒径为 198 nm 的纳米颗粒，包埋效率为 67.42%。通过细胞活力测定、定量 PCR 病毒 DNA 分析、Caspase-3 酶测定以及使用高效液相色谱法（HPLC）进行的定量吸收研究，可以定量了解合成纳米粒子的功效和生物相容性。实验数据表明，纳米粒子处理对细胞反应有显著影响，为了解其治疗潜力和潜在机制提供了宝贵的信息。通过采用精确的实验方法和严格的分析技术，这项研究加深了我们对基于纳米粒子的给药系统的了解，尤其是在艾滋病治疗方面。这些发现为优化治疗策略、改善患者预后铺平了道路。

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引用次数: 0

Cutting behaviors of cortical bone ultrasonic vibration-assisted cutting immersed in physiological saline 浸泡在生理盐水中的皮质骨超声振动辅助切割行为。

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-29 DOI: 10.1016/j.ultsonch.2024.107135

Peng Gao , Zhiyu Xu , Xinlong Zhao , Shengqi Li , Min Wang , Linkai Jing , Tao Zan

In orthopedic surgery, cortical bone cutting usually involves washing and cooling with physiological saline. However, how the saline changes the cutting behaviors of bone ultrasonic vibration cutting remains challenging. Hence, this paper simulates the clinical ultrasonic cutting condition in orthopedics to reveal the cutting behaviors of bone ultrasonic vibration orthogonal cutting immersed in physiological saline. The dynamic equation and motion process curves of ultrasonic cavitation bubbles were established. The results showed that the bone cutting immersed in physiological saline significantly improved the surface quality, reduced surface roughness and mechanical damage, and avoided large brittle cracks propagation. In saline immersed cutting, the physiological saline changes the mechanical behaviors of bone materials, resulting in plastic behaviors for the material removal and crack deflection. This study establishes the influence of physiological saline on the ultrasonic vibration cutting performance, providing guidance for orthopedic bone cutting surgery methods.

在骨科手术中，皮质骨切割通常需要用生理盐水清洗和冷却。然而，生理盐水如何改变骨超声振动切割的切割行为仍是一个挑战。因此，本文模拟骨科临床超声切割条件，揭示浸入生理盐水的骨超声振动正交切割的切割行为。建立了超声空化气泡的动态方程和运动过程曲线。结果表明，浸泡在生理盐水中的骨切割能显著改善表面质量，降低表面粗糙度和机械损伤，避免大的脆性裂纹扩展。在生理盐水浸泡切削中，生理盐水改变了骨材料的力学行为，导致材料去除和裂纹偏转的塑性行为。本研究确定了生理盐水对超声振动切割性能的影响，为骨科骨切割手术方法提供了指导。

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引用次数: 0

Okara protein extracted by alternating ultrasonic/alkali treatment and its improved physicochemical and functional properties 通过超声波/碱交替处理提取的奥卡拉蛋白及其改进的理化和功能特性。

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.ultsonch.2024.107129

Lu Tang , Xiaolin Liu , Shiru Bai, Dan Zhao, Xuzhen Guo, Dandan Zhu, Guiying Su, Bei Fan, Bo Wang, Liang Zhang, Fengzhong Wang

Okara protein (OP) is a potential plant-based protein that is beneficial to human health. In this work, an alternating ultrasonic/alkali treatment method with non-continued cavitation and thermal energy output was used to extract protein (AUA-OP) from okara to enhance the functional properties of OP and improve the stability of OP-based emulsions. The purity of AUA-OP was greater than 80%. Compared with traditional (physical-assisted) alkali treatment, FTIR and SDS-PAGE revealed that AUA-OP retained the chemical structure of the protein, but the number of ultrasound-induced exposure sites increased, with increased fluorescence intensity, surface hydrophobicity, and absolute ζ-potential. After alternating ultrasonic/alkali treatment, the protein particles were looser and smaller. In addition, the water/oil holding capacity, EAI, and ESI of AUA-OP further increased. The viscosity of the AUA-OP-stabilized emulsion was also greater. Finally, a 28-day emulsion storage assay revealed that the AUA-OP-stabilized emulsion was stable with a relatively low droplet size and creaming index, indicating great potential for the development of stable protein-based emulsions.

奥卡拉蛋白（OP）是一种对人类健康有益的潜在植物性蛋白。本研究采用非连续空化和热能输出的超声波/碱交替处理方法从秋葵中提取蛋白质（AUA-OP），以增强 OP 的功能特性并提高 OP 乳剂的稳定性。AUA-OP 的纯度大于 80%。与传统的（物理辅助）碱处理相比，傅立叶变换红外光谱和 SDS-PAGE 显示，AUA-OP 保留了蛋白质的化学结构，但超声诱导的暴露位点数量增加，荧光强度、表面疏水性和绝对ζ电位增加。超声波/碱交替处理后，蛋白质颗粒变得更松散、更小。此外，AUA-OP 的持水/持油能力、EAI 和 ESI 进一步提高。AUA-OP 稳定乳液的粘度也更高。最后，28 天的乳液储存试验表明，AUA-OP 稳定乳液具有相对较低的液滴大小和起泡指数，非常稳定，这表明其在开发稳定的蛋白质乳液方面具有巨大潜力。

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引用次数: 0

Antimicrobial and antifouling hyaluronic acid-cobalt nanogel coatings built sonochemically on contact lenses 用声波化学方法在隐形眼镜上形成抗菌防污透明质酸-钴纳米凝胶涂层。

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.ultsonch.2024.107131

Guillem Ferreres , Sílvia Pérez-Rafael , Ester Guaus , Òscar Palacios , Ivan Ivanov , Juan Torrent-Burgués , Tzanko Tzanov

The wearing of contact lenses (CLs) may cause bacterial infections, leading in turn to more serious complications and ultimately vision impairment. In this scenario, the first step is the adhesion of tear proteins, which provide anchoring points for bacterial colonization. A possible solution is the functionalization with an antimicrobial coating, though the latter may also lead to sight obstruction and user discomfort. In this study, adipic acid dihydrazide-modified hyaluronic acid-cobalt (II) (HA-ADH-Co) nanogels (NGs) were synthesized and deposited onto commercial CLs in a single-step sonochemical process. The coating hindered up to 60 % the protein adsorption and endowed the CLs with strong antibacterial activity against major ocular pathogens like Staphylococcus aureus and Pseudomonas aeruginosa, reducing their concentration by around 3 logs. Cytotoxicity assessment with human corneal cells demonstrated viabilities above 95 %. The nanocomposite coating did not affect the optical power and the light transmission of the CLs and provided enhanced wettability, important for the wearer comfort.

佩戴隐形眼镜（CL）可能会引起细菌感染，进而导致更严重的并发症，最终损害视力。在这种情况下，第一步是泪液蛋白的粘附，这为细菌的定植提供了锚点。一种可能的解决方案是使用抗菌涂层进行功能化，但后者也可能导致视力障碍和用户不适。在这项研究中，我们合成了己二酸二酰肼修饰的透明质酸-钴（II）（HA-ADH-Co）纳米凝胶（NGs），并通过单一步骤的超声化学过程将其沉积到商用眼镜上。该涂层阻碍了高达 60% 的蛋白质吸附，并赋予了 CLs 针对金黄色葡萄球菌和绿脓杆菌等主要眼部病原体的强大抗菌活性，使其浓度降低了约 3 个对数值。用人类角膜细胞进行的细胞毒性评估显示，细胞存活率超过 95%。纳米复合涂层不会影响角膜接触镜的光学功率和透光率，还能提高润湿性，这对佩戴者的舒适度非常重要。

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引用次数: 0

Ultrasound-assisted low-sodium salt curing to modify the quality characteristics of beef for aging 超声波辅助低钠盐腌制改变牛肉老化质量特性。

IF 8.7 1区化学 Q1 ACOUSTICS

Ultrasonics Sonochemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.ultsonch.2024.107134

Lei Liu , Fengnan Niu , Yating Xiong , Peng Wang , Xiaoyu Lyu , Zongyun Yang

Meat products for elderly people are high in sodium content and hardness. Thus, the aim of this study is to explore how ultrasound-assisted low-sodium salting improves meat quality and determine the conditions that result in meat tenderness ideal for people aged 65–74 years. The ultrasound-assisted treatment of bovine hip muscle with non-sodium salt (CaCl₂ and C₆H₁₀CaO₆) was adopted, followed by sous vide (SV) cooking (65 ℃ for 8–12 h). Results showed that ultrasound-assisted low-sodium salt curing can considerably reduce the shear force and hardness of beef (P < 0.05), promote the diffusion of Na⁺ (P < 0.05), and increase water content (P < 0.05), consistent with the water mobility results of low-field nuclear magnetic resonance. The tenderized effects were examined by Raman spectroscopy, which showed that the ordered α-helix and β-fold contents of the meat proteins decreased, and disordered β-turn and random coil contents increased after heat treatment with ultrasound-assisted low-sodium salt curing. Scanning electron microscopy revealed that the degree of muscle fiber destruction by ultrasound-assisted low-sodium salt curing combined with heat treatment was higher than that observed after traditional cooking with high amounts of sodium. With regard to tenderness, beef marinated with ultrasound-assisted C₆H₁₀CaO₆ and subjected for 10 h was preferred by people aged 65–74 years. Ultrasound-assisted low-sodium salt curing can improvements on simultaneously reduce the sodium content and enhance the tenderness of meat products for elderly people, and provides an ultrasonic scheme for meat processing using non-sodium salt.

老年人食用的肉制品钠含量高、硬度大。因此，本研究的目的是探讨超声辅助低钠腌制如何改善肉质，并确定适合 65-74 岁人群的肉质嫩度条件。研究采用超声波辅助非钠盐（CaCl2 和 C6H10CaO6）处理牛臀部肌肉，然后进行蒸煮（65 ℃，8-12 h）。结果表明，超声波辅助低钠盐腌制能显著降低牛肉的剪切力和硬度（P < 0.05），促进 Na+ 的扩散（P < 0.05），增加水分含量（P < 0.05），与低场核磁共振的水迁移率结果一致。拉曼光谱对嫩化效果进行了检测，结果表明，经超声辅助低钠盐腌制热处理后，肉类蛋白质的有序α螺旋和β折叠含量降低，无序β匝和无规线圈含量增加。扫描电子显微镜显示，超声波辅助低钠盐腌制和热处理对肌肉纤维的破坏程度高于传统的高钠烹饪。在嫩度方面，65-74 岁的人更喜欢用超声波辅助 C6H10CaO6 腌制 10 小时的牛肉。超声波辅助低钠盐腌制可同时降低钠含量和提高肉制品的嫩度，适合老年人食用，为使用无钠盐的肉类加工提供了超声波方案。

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