Journal of Supercritical Fluids最新文献_第6页

Zeolitic imidazolate framework-8 coating in supercritical carbon dioxide for novel membranes design and the supercritical bridge phenomenon 沸石咪唑酯框架-8涂层在超临界二氧化碳中的新型膜设计和超临界桥现象

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-12-01 DOI: 10.1016/j.supflu.2025.106864

Ashika Dilshani Wackwella Gamage , Hanin Samara , Ewa Lorenc-Grabowska , Mahmoodzia Zamaninia , Ewelina Ksepko , Irena Zizovic

The study investigates Zeolitic imidazolate framework-8 (ZIF-8) coating with adipic dihydrazide (ADH) using supercritical carbon dioxide (scCO₂), with the aim of designing composite membranes that exhibit improved homogeneity and compatibility between the polymer and filler. Two high pressure techniques were applied to modify ZIF-8 particles, comprising supercritical solvent impregnation (SSI) that avoids the usage of any organic solvent, and supercritical assisted impregnation (SAI) in the presence of either water or DMF as a solvent for ADH. The effects of pure scCO₂ on ZIF-8 and its high-pressure hydrolysis were also investigated. The ZIF-8 modification was followed by FTIR, XRD, TGA, BET, and SEM methods. Cellulose acetate-based composite membranes were prepared using modified and pristine ZIF-8 and characterized by SEM/FIB and for hydrogen permeation. The results revealed that the coating of ZIF-8 by SAI and DMF as a solvent for ADH affected the structure of ZIF-8 least. Interestingly, despite the low solubility of ADH in scCO₂, the SSI was successful due to the high affinity of ADH toward ZIF-8, demonstrating a supercritical bridge phenomenon. However, the process affected the BET surface area, particle morphology, and porosity. Composite membranes prepared with a modified filler showed improved homogeneity and reduced hydrogen permeation, qualifying for further studies on the separation of gas mixtures containing hydrogen and carbon dioxide.

本研究利用超临界二氧化碳（scCO2）对己二酰二肼（ADH）包覆沸石咪唑酸骨架-8 （ZIF-8）进行了研究，目的是设计出具有更好的聚合物和填料之间的均匀性和相容性的复合膜。采用了两种高压技术来修饰ZIF-8颗粒，包括避免使用任何有机溶剂的超临界溶剂浸渍（SSI）和在水或DMF作为ADH溶剂存在下的超临界辅助浸渍（SAI）。研究了纯scCO2对ZIF-8及其高压水解的影响。采用FTIR、XRD、TGA、BET和SEM等方法对ZIF-8进行了改性。采用改性的ZIF-8制备了醋酸纤维素基复合膜，并对其进行了SEM/FIB表征和氢渗透表征。结果表明，SAI和DMF作为ADH的溶剂对ZIF-8的结构影响最小。有趣的是，尽管ADH在scCO2中的溶解度很低，但由于ADH对ZIF-8的高亲和力，SSI成功了，证明了超临界桥现象。然而，该工艺影响了BET的表面积、颗粒形态和孔隙率。用改性填料制备的复合膜表现出更好的均匀性和降低的氢渗透，为进一步研究含氢和二氧化碳的气体混合物的分离提供了条件。

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引用次数: 0

From spent coffee residues to sustainable packaging: Zein-based active films produced via supercritical impregnation 从废咖啡渣到可持续包装：通过超临界浸渍生产的基于玉米蛋白的活性薄膜

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-12-01 DOI: 10.1016/j.supflu.2025.106865

Stefania Mottola , Emanuela Drago , Federica Montella , Giuseppe Firpo , Roberta Campardelli , Iolanda De Marco

The reuse of residues from the agri-food industry for the development of active food packaging represents a sustainable alternative that has gained increasing attention in recent years. In this work, active zein films were produced by impregnating them with a multicomponent extract derived from spent coffee grounds – a rich natural source of antioxidants, polyphenols, and other bioactive components – via a sustainable supercritical carbon dioxide technique. This process offers a novel and eco-friendly approach to loading bioactive multicomponent extracts onto biodegradable films. The extracts were obtained via high-pressure and temperature extraction (HPTE), while the zein films were produced using either solvent casting (ZCAS) or electrospinning (ZELC). Supercritical impregnation was employed to load a multicomponent extract into zein films. Process parameters such as temperature and contact time were optimized to maximize impregnation efficiency. The loading, quantified using caffeine as a reference compound, was 0.64 mg caffeine/g film for ZCAS and 0.93 mg caffeine/g film for ZELC. The impregnated zein films exhibited enhanced light barrier properties and antioxidant activity, as confirmed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) analysis, indicating their potential as sustainable, active, and eco-friendly packaging materials. Moreover, the use of spent coffee grounds as a source of active ingredients, combined with zein as the film matrix, provides a novel upcycling strategy. This dual-function approach aligns with current efforts to enhance food system sustainability through innovations in material science and waste valorisation.

利用农业食品工业的残留物开发活性食品包装代表了一种可持续的替代方案，近年来得到了越来越多的关注。在这项工作中，活性玉米蛋白薄膜是通过可持续的超临界二氧化碳技术，用从废咖啡渣中提取的多组分提取物浸渍而成的，咖啡渣是抗氧化剂、多酚和其他生物活性成分的丰富天然来源。该工艺提供了一种新颖而环保的方法，将生物活性多组分提取物装载到可生物降解的薄膜上。采用高压高温萃取法（HPTE）提取玉米蛋白，溶剂铸造法（ZCAS）或静电纺丝法（ZELC）制备玉米蛋白膜。采用超临界浸渍法将多组分提取物装入玉米蛋白膜中。优化了浸渍温度和浸渍时间等工艺参数，使浸渍效率最大化。以咖啡因作为参比化合物进行定量，ZCAS的负载为0.64 mg咖啡因/g膜，ZELC的负载为0.93 mg咖啡因/g膜。经2,2-二苯基-1-吡啶酰肼（DPPH）分析证实，浸渍玉米蛋白薄膜具有增强的光阻隔性能和抗氧化活性，表明其具有作为可持续、活性和环保包装材料的潜力。此外，使用废咖啡渣作为活性成分的来源，结合玉米蛋白作为薄膜基质，提供了一种新的升级回收策略。这种双重功能的方法与目前通过材料科学和废物增值方面的创新来提高粮食系统可持续性的努力相一致。

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引用次数: 0

Enhancing sterilization efficacy: Evaluating bacterial resistance to supercritical CO2 提高灭菌效果：评价细菌对超临界CO2的抗性

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-11-29 DOI: 10.1016/j.supflu.2025.106863

J.S. Zhang , A. Mouahid , C. Crampon , Z.S. Xu , N. Neumann , F. Temelli , M.G. Gänzle , E. Badens

Sterilization using supercritical CO₂ (scCO₂) can be conducted at relatively low temperatures but additive-assisted treatments are often required for the complete inactivation of dried resistant strains. Such treatments have not been validated across a panel of relevant target microorganisms. This study aimed to investigate the bacterial reduction of 16 bacterial strains with known resistance to diverse environmental stressors. The selection included strains of Escherichia coli and Bacillus spp. that are highly resistant to wet heat, the heat resistant Geobacillus stearothermophilus, strains of Salmonella with exceptional resistance to dry heat, and Klebsiella pneumoniae isolates from chlorinated wastewater. Treatment of desiccated cells or endospores with scCO₂ at 11 MPa and 40 °C with 200 H₂O₂ reduced cell counts of most strains by more than 6 log₁₀ (cfu / mL) but cell counts of G. stearothermophilus, Salmonella and K. pneumoniae were reduced by 1 to 4 log₁₀ (cfu / mL). Addition of 200 ppm and 400 ppm peracetic acid increased treatment lethality; treatment with scCO₂ at 11 MPa and 40 °C in the presence of 200 H₂O₂ and 400 ppm peracetic acid reduced cell counts of all strains by more than 6 log₁₀ (cfu / mL). In conclusion, treatment with scCO₂ at 11 MPa and 40 °C in the presence of H₂O₂ and peracetic acid reduces cell counts of resistant target microorganisms. This is particularly relevant for the sterilization of implantable and reusable medical devices and serves as a suitable alternative for sterilizing devices that contain heat-sensitive polymers.

使用超临界CO₂（scCO₂）的灭菌可以在相对较低的温度下进行，但通常需要添加剂辅助处理才能完全灭活干燥的抗性菌株。这些治疗方法尚未在一组相关目标微生物中得到验证。本研究旨在研究16种已知对不同环境胁迫具有抗性的细菌菌株的细菌减少情况。选择的菌株包括对湿热具有高度抗性的大肠杆菌和芽孢杆菌，耐热的嗜脂热地杆菌，对干热具有特殊抗性的沙门氏菌菌株，以及从氯化废水中分离的肺炎克雷伯菌。在11 MPa和40℃条件下，用200 H2O2处理干燥的细胞或内生孢子，使大多数菌株的细胞计数减少6 log10 （cfu / mL）以上，而嗜脂热链球菌、沙门氏菌和肺炎克雷伯菌的细胞计数减少1 ~ 4 log10 （cfu / mL）。加入200 ppm和400 ppm的过氧乙酸可提高处理致死率；在200 H2O2和400 ppm过氧乙酸存在下，scCO2在11 MPa和40°C条件下处理，使所有菌株的细胞计数减少6 log10 （cfu / mL）以上。综上所述，在H2O2和过氧乙酸存在的情况下，在11 MPa和40°C条件下用scCO2处理可减少耐药目标微生物的细胞计数。这与植入式和可重复使用医疗器械的灭菌特别相关，并可作为含有热敏聚合物的灭菌设备的合适替代方案。

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引用次数: 0

Dense membranes for the recovery of solutes from supercritical CO2: A review 从超临界CO2中回收溶质的致密膜研究进展

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-11-24 DOI: 10.1016/j.supflu.2025.106847

Ana Paula Kaucz, Dihia Chabni, Jean-Stéphane Condoret, Jean-Christophe Remigy, Séverine Camy

This review provides a comprehensive and updated analysis of the use of dense polymeric membranes with supercritical carbon dioxide (SC-CO₂) processes, with the target of the recovery of solutes solubilized in SC-CO₂ for energy savings. Based on a systematic literature review, this work categorizes membrane applications into three main operational scenarios, each defined by distinct solute-CO₂-membrane interactions. These scenarios are used as a guiding framework to evaluate membrane materials, process configurations, and performance metrics such as permeance, selectivity, and energy efficiency. Both rubbery and glassy polymers are discussed, with emphasis on their behavior under SC-CO₂ conditions, including plasticization, swelling, and long-term stability. Advanced strategies for mitigating CO₂-induced membrane degradation and enhancing separation performance are also addressed. Although promising, the integration of dense membranes in SC-CO₂ systems remains limited by the lack of long-term performance data and by challenges in scaling up to industrial applications. This review not only summarizes current knowledge but also identifies research gaps and provides perspectives for future developments in this emerging field.

本文综述了超临界二氧化碳（SC-CO2）工艺对致密聚合物膜的应用进行了全面和最新的分析，其目标是回收在SC-CO2中溶解的溶质以节省能源。基于系统的文献综述，本研究将膜的应用分为三种主要的操作场景，每种场景都由不同的溶质-二氧化碳-膜相互作用定义。这些场景被用作评估膜材料、工艺配置和性能指标（如渗透率、选择性和能源效率）的指导框架。讨论了橡胶和玻璃聚合物，重点讨论了它们在SC-CO2条件下的行为，包括塑化，膨胀和长期稳定性。还讨论了减轻二氧化碳诱导的膜降解和提高分离性能的先进策略。尽管前景很好，但由于缺乏长期性能数据和扩大工业应用的挑战，SC-CO2系统中致密膜的集成仍然受到限制。本文不仅总结了目前的知识，还指出了研究差距，并为这一新兴领域的未来发展提供了展望。

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引用次数: 0

Molecular dynamics study on the Widom Line of binary mixture of methane and oxygen system 甲烷-氧二元混合物的分子动力学研究

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-11-24 DOI: 10.1016/j.supflu.2025.106851

Erxing Ren , Xiaoyu Yao , Zhi Yang , Qiaoyan Dong , Jun Shen

Liquid oxygen/liquid methane rockets are currently one of the most mature technologies among heavy-lift launch vehicles. However, the combustion of methane and oxygen is a complex transcritical process. The fluid crosses the Widom line can lead to heat transfer deterioration, thereby affecting the stability of combustion. This paper uses molecular dynamics (MD) simulations to calculate the Widom line of the methane-oxygen binary mixture with component changes and investigates the changes in microscopic structure of the mixture as it crosses the Widom line. The results of radial distribution function (RDF) indicate that the second peak exists in the liquid-like region, and when the binary mixture crosses the Widom line into the gas-like region, the second peaks of both components disappear simultaneously. This research findings provide a method for identifying the Widom line of binary mixtures and assist in engineering the identification of regions where heat transfer deterioration occurs during supercritical processes.

液氧/液态甲烷火箭是目前重型运载火箭中技术最成熟的运载火箭之一。然而，甲烷和氧气的燃烧是一个复杂的跨临界过程。流体越过智能线会导致传热恶化，从而影响燃烧的稳定性。本文采用分子动力学（MD）模拟计算了组分变化的甲烷-氧二元混合物的wiom线，并研究了混合物越过wiom线时微观结构的变化。径向分布函数（RDF）结果表明，第二峰存在于类液区，当二元混合物越过Widom线进入类气区时，两组分的第二峰同时消失。该研究结果为二元混合物的智能线识别提供了一种方法，并有助于在工程上识别超临界过程中发生传热恶化的区域。

引用次数: 0

Towards a sustainable utilization of Tannat grape seeds: Extraction of bioactive compounds through green technologies and waste revalorization 单宁葡萄籽的可持续利用：通过绿色技术和废物再利用提取生物活性化合物

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-11-23 DOI: 10.1016/j.supflu.2025.106850

Carla Bonifacino , Cecilia Dauber , Analía Martínez , Florencia Tourné , Bruno Irigaray , Ignacio Vieitez , Cecilia Abirached

Valorizing wine industry by-products like Tannat grape seeds offers a sustainable path to recover high-value bioactives and reduce environmental impact. This study aims to achieve their comprehensive value-added utilization by comparing extraction methods to obtain bioactive compounds of interest and by characterizing the functional properties of the solid residue remaining after extraction. Three extraction techniques were applied: the conventional Soxhlet method, using either absolute ethanol or hexane, supercritical fluid extraction (SFE) and pressurized liquid extraction (PLE), assessing the effects of temperature and ethanol concentration on extraction yield and antioxidant properties. Under optimal conditions (80 °C and 67 % ethanol), PLE achieved a higher yield than the conventional method, with elevated α-tocopherol content (844.4 ± 15.3 mg/kg mg/kg) and a lipid fraction dominated by polyunsaturated fatty acids, primarily linoleic acid. This fraction showed significant antioxidant capacity as determined by the ABTS and ORAC-FL assays and, in an accelerated oxidation test, increased the induction period of sunflower oil in a concentration-dependent manner, with an effect comparable to that of the synthetic antioxidant BHA. The solid residue generated after PLE was evaluated for its techno-functional properties. It exhibited higher water-holding capacity compared with untreated ground seeds, possibly due to its higher relative fiber content and structural changes induced by processing. Furthermore, the residue retained residual bioactive properties, highlighting its potential as a functional ingredient. Overall, these results support the use of PLE as an efficient strategy for the integral and sustainable utilization of Tannat grape seeds.

对像丹纳特葡萄籽这样的葡萄酒工业副产品进行估价，为回收高价值生物活性物质和减少对环境的影响提供了一条可持续的途径。本研究旨在通过比较提取方法获得感兴趣的生物活性化合物，并对提取后的固体残渣的功能特性进行表征，实现其综合增值利用。采用常规索氏法（无水乙醇或正己烷）、超临界流体萃取（SFE）和加压液体萃取（PLE）三种提取工艺，考察温度和乙醇浓度对提取率和抗氧化性能的影响。在最佳条件下（80°C，乙醇含量为67% %），PLE的收率高于常规方法，α-生育酚含量提高（844.4±15.3 mg/kg mg/kg），脂质部分以多不饱和脂肪酸为主，主要是亚油酸。ABTS和ORAC-FL实验表明，该组分具有显著的抗氧化能力，并且在加速氧化试验中，以浓度依赖的方式延长了葵花籽油的诱导期，其效果与合成抗氧化剂BHA相当。对电解后产生的固体残渣进行了工艺功能性能评价。与未经处理的磨碎种子相比，它表现出更高的持水能力，可能是由于其相对纤维含量较高和加工引起的结构变化。此外，该残留物保留了剩余的生物活性特性，突出了其作为功能性成分的潜力。总的来说，这些结果支持将PLE作为一种有效的策略，用于Tannat葡萄种子的整体和可持续利用。

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引用次数: 0

Sustainable hydrogen production via catalytic supercritical water gasification of microalgae biomass in glycerol-methanol mixture 微藻生物质在甘油-甲醇混合物中催化超临界水气化可持续制氢

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-11-23 DOI: 10.1016/j.supflu.2025.106849

Ghazal Azadi, Arash Hedayati, Omid Tavakoli, Fatemeh Saberi

The reliance on fossil fuels has led to significant environmental issues, including greenhouse gas emissions and climate change. As global energy demand increases, the need for sustainable alternatives becomes crucial. Microalgae have emerged as a renewable and carbon-neutral source for hydrogen production through supercritical water gasification (SCWG) due to their rapid growth, minimal land requirements, and beneficial biochemical properties. This study examines hydrogen production from Dunaliella salina, Spirulina platensis, and Chlorella vulgaris through SCWG at 400°C, 242 bar, and a 45 min residence time. A 4 wt% glycerol/methanol mixture, simulating biodiesel byproducts, was used as the reaction medium with and without a 10 wt% cobalt catalyst at feed concentrations of 5, 10, and 15 wt%. Among microalgae, Dunaliella salina yielded the highest hydrogen mole fraction, reaching 65 % at 10 wt% feed concentration. The cobalt catalyst significantly enhanced hydrogen production (e.g., Dunaliella salina from 38.8 % to 58.5 % H₂ at 15 wt%), hydrogen selectivity (max 50.43 %), and gasification efficiency (max 14.5 %). Moreover, replacing deionized water with a glycerol/methanol medium proved highly beneficial. This substitution substantially increased hydrogen production, alongside notable improvements in selectivity and gasification efficiency, highlighting the synergistic effect of biodiesel byproducts as a reactive solvent in SCWG. These findings underscore the dual benefit of employing biodiesel-derived reaction media and cobalt catalysis in simultaneously enhancing the efficiency and performance of the gasification process. Among the studied species, Dunaliella salina showed the highest potential for clean hydrogen generation, confirming its promise as a strategic microalgal feedstock for future sustainable energy systems.

对化石燃料的依赖导致了严重的环境问题，包括温室气体排放和气候变化。随着全球能源需求的增加，对可持续替代能源的需求变得至关重要。微藻由于其快速生长、对土地的需求最小和有益的生化特性，已成为通过超临界水气化（SCWG）制氢的可再生和碳中性来源。本研究考察了盐杜氏藻、平螺旋藻和小球藻在400°C、242 bar和45 min停留时间下的SCWG产氢情况。模拟生物柴油副产品的4 wt%的甘油/甲醇混合物，在5、10和15 wt%的进料浓度下，用10 wt%的钴催化剂和不加10 wt%的钴催化剂作为反应介质。在微藻中，盐杜氏藻的氢摩尔分数最高，在饲料浓度为10 wt%时达到65 %。钴催化剂显著提高了产氢率（例如，在15 wt%时，Dunaliella salina从38.8 %提高到58.5 % H2）、氢气选择性（最大50.43 %）和气化效率（最大14.5 %）。此外，用甘油/甲醇介质代替去离子水被证明是非常有益的。这种替代大大增加了氢气产量，同时显著提高了选择性和气化效率，突出了生物柴油副产品作为SCWG反应溶剂的协同作用。这些发现强调了采用生物柴油衍生的反应介质和钴催化在同时提高气化过程的效率和性能方面的双重好处。在研究的物种中，杜氏盐藻显示出最高的清洁制氢潜力，证实了其作为未来可持续能源系统战略微藻原料的前景。

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引用次数: 0

Phase equilibrium data for carbon dioxide/methane/hydrogen + 2-methyl quinoline from T = 263–393 K and P up to 2.6 MPa 二氧化碳/甲烷/氢+ 2-甲基喹啉在T = 263 ~ 393 K和P高达2.6 MPa时的相平衡数据

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-11-23 DOI: 10.1016/j.supflu.2025.106848

Paul Zvawanda , Paramespri Naidoo , Wayne M. Nelson , Kuveneshan Moodley

Hydrogen production via natural gas reforming with integrated carbon capture technology is a viable option as a cleaner fuel source. The solubility of carbon dioxide, methane, and hydrogen into quinaldine (a liquid organic hydrogen carrier, with a hydrogen carrying capacity of 6.6 wt%) is explored for its potential in a direct hydrogen capture application. This study investigated the phase equilibria data for carbon dioxide/methane/hydrogen + 2-methyl-quinoline (quinaldine) over a temperature range of 263–393 K and pressures up to 2.6 MPa. Experiments were conducted using a static synthetic visual apparatus. Validation of the experimental technique was performed through the measurement of vapour-liquid equilibrium data for the carbon dioxide + methanol/n-dodecane/triethylene-glycol test systems from 298 to 353 K and the hydrogen + cyclohexane test system at 303 K. Generally good comparisons were observed between the reported literature data and the data of this work. The data were regressed in Aspen Plus V14 using the Peng-Robinson equation of state. Such information aids in generating a database for phase equilibrium data related to carbon capture and energy storage materials, which forms the backbone for the design of separation and purification units.

通过天然气重整和综合碳捕获技术制氢是一种可行的清洁燃料来源。研究了二氧化碳、甲烷和氢在喹啉（一种液态有机氢载体，携氢量为6.6 wt%）中的溶解度，以探索其在直接捕氢应用中的潜力。本文研究了二氧化碳/甲烷/氢+ 2-甲基喹啉（quinaldine）在263-393 K和2.6 MPa的温度范围内的相平衡数据。实验采用静态合成视觉仪进行。通过测量二氧化碳+ 甲醇/正十二烷/三甘醇测试体系在298 ~ 353 K和氢+ 环己烷测试体系在303 K的汽液平衡数据来验证实验技术。一般来说，在报道的文献数据和本工作的数据之间观察到良好的比较。在Aspen Plus V14中使用Peng-Robinson状态方程对数据进行回归。这些信息有助于生成与碳捕获和储能材料相关的相平衡数据数据库，这些数据构成了分离和净化装置设计的支柱。

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引用次数: 0

Lattice-Boltzmann methods for supercritical fluids flows 超临界流体流动的晶格-玻尔兹曼方法

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-11-22 DOI: 10.1016/j.supflu.2025.106838

Jian Cardenas, Song Zhao, Isabelle Raspo, Guillaume Chiavassa, Pierre Boivin

This article develops two algorithms for the thermal Lattice Boltzmann Method (LBM) to simulate supercritical fluid dynamics using real-fluid thermodynamics. The first algorithm employs a compressible formulation (LBM-C), while the second is based on a Low Mach Number approximation (LBM-LMN) to enhance computational efficiency without compromising physical fidelity. Both approaches use a conservative scheme compatible with cubic equations of state (EOS), enabling accurate representation of non-ideal behaviors under supercritical conditions and ensuring mass, momentum, and energy conservation. Validation on canonical supercritical flow benchmarks demonstrates that the LBM-LMN approach achieves accuracy comparable to the compressible formulation while reducing the overall computational time by a factor of about 15, as quantified by the RTTS parameter.

本文发展了热晶格玻尔兹曼方法（LBM）的两种算法，利用实流体热力学来模拟超临界流体动力学。第一种算法采用可压缩公式（LBM-C），而第二种算法基于低马赫数近似（LBM-LMN），在不影响物理保真度的情况下提高计算效率。这两种方法都使用与三次状态方程（EOS）兼容的保守格式，能够准确地表示超临界条件下的非理想行为，并确保质量、动量和能量守恒。典型超临界流基准的验证表明，LBM-LMN方法达到了与可压缩公式相当的精度，同时将总体计算时间减少了约15倍（由RTTS参数量化）。

引用次数: 0

New approaches for improving bioactivity and stability of natural extracts: CO2-assisted compressed NADES and microencapsulation 提高天然提取物生物活性和稳定性的新方法：co2辅助压缩NADES和微胶囊化

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2025-11-21 DOI: 10.1016/j.supflu.2025.106845

Victor M. Amador-Luna , Lidia Montero , Carlos Pajuelo , Clovis Antonio Balbinot Filho , Marcelo Lanza , Sandra Regina Salvador Ferreira , Elena Ibáñez , Miguel Herrero

This study focused on optimizing a Natural Deep Eutectic Solvent (NADES)-based extraction for recovering bioactive compounds, particularly phenolic and terpenic compounds, from orange by-products, aimed at neuroprotection. CO₂-assisted pressurized NADES extraction enhanced both yield and bioactivity compared to more conventional approaches. After the extraction, the encapsulation of the extract obtained with pressurized betaine:glycerol (Bet:Gly, 1:2) was optimized through a Box-Behnken design using soy phosphatidylcholine as encapsulating agent; optimum process conditions were: concentration of the extract, 4199 ppm; orbital agitation time, 99.1 min; temperature, 55.1 °C. The encapsulation process allowed retaining 66 %, 34 %, and 80 % of carotenoids, terpenes, and phenolic compounds, respectively. Once the optimum conditions were stablished, sunflower lecithin was also tested as a new encapsulating agent. The use of sunflower lecithin improved terpene and phenolic compounds encapsulation by 18 and 15 %, respectively, significantly enhancing potential neuroprotective capacity. Moreover, the chemical characterization of the extract further supported these findings. Stability tests revealed that pressurized NADES extracts maintained their bioactivity for 15 days, whereas the microencapsulation process improved stability and preserved bioactivity for over four months. Despite some losses in terpene and phenolic content under accelerated conditions, microencapsulation significantly extended the shelf-life and functionality of the bioactive compounds.

本研究的重点是优化一种基于天然深共熔溶剂（NADES）的提取方法，从橙子副产品中提取生物活性化合物，特别是酚类和萜烯类化合物，旨在保护神经。与更传统的方法相比，CO₂辅助加压NADES提取提高了产量和生物活性。提取后，以大豆磷脂酰胆碱为包封剂，通过Box-Behnken设计优化甜菜碱：甘油（Bet:Gly, 1:2）加压提取液的包封效果；最佳工艺条件为：提取液浓度为4199 ppm；轨道搅拌时间，99.1 min；温度：55.1°C。包封工艺允许保留66% %，34% %和80% %的类胡萝卜素，萜烯和酚类化合物。确定了最佳工艺条件后，对向日葵卵磷脂作为新型包封剂进行了试验。使用向日葵卵磷脂可使萜烯和酚类化合物的包封率分别提高18%和15% %，显著提高潜在的神经保护能力。此外，提取物的化学特性进一步支持了这些发现。稳定性测试表明，加压NADES提取物的生物活性维持了15天，而微胶囊化工艺提高了稳定性，并保持了4个多月的生物活性。尽管在加速条件下萜烯和酚含量会有所损失，但微胶囊化显著延长了生物活性化合物的保质期和功能。

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引用次数: 0