Pub Date : 2024-08-23DOI: 10.1016/j.supflu.2024.106391
Jie Yuan, Kun Xue, Xiulu Gao, Yichong Chen, Ling Zhao, Dongdong Hu
Poly (butylene adipate-co-terephthalate) (PBAT) foam is a potential alternative to conventional packaging materials. However, its wide adoption is hindered by issues such as low foaming–expansion ratios and shrinkage. A series of biodegradable epoxidized cardanol (EC)-modified PBAT foams were prepared using supercritical carbon dioxide (CO2) foaming. The addition of EC enhanced the crystallisation temperature and stiffness, and improved the rheological properties, thereby promoting polymer foamability. When the EC content reached 0.6 wt%, lightweight foams with the highest initial expansion ratio (Rv) of 48.4 were produced before shrinkage. N2 was introduced as a co-blowing agent to reduce shrinkage of the PBAT foams, resulting in the production of a microcellular foam with a stable Rv of 12.9. EC improved the foamability of PBAT while also introducing the co-blowing agent N2 to resist shrinkage. These findings can serve as valuable insights for the large-scale production of lightweight biodegradable foams.
{"title":"Green preparation of biodegradable poly (butylene adipate-co-terephthalate) foam modified with bio-based epoxidized cardanol using supercritical fluid foaming","authors":"Jie Yuan, Kun Xue, Xiulu Gao, Yichong Chen, Ling Zhao, Dongdong Hu","doi":"10.1016/j.supflu.2024.106391","DOIUrl":"10.1016/j.supflu.2024.106391","url":null,"abstract":"<div><p>Poly (butylene adipate-co-terephthalate) (PBAT) foam is a potential alternative to conventional packaging materials. However, its wide adoption is hindered by issues such as low foaming–expansion ratios and shrinkage. A series of biodegradable epoxidized cardanol (EC)-modified PBAT foams were prepared using supercritical carbon dioxide (CO<sub>2</sub>) foaming. The addition of EC enhanced the crystallisation temperature and stiffness, and improved the rheological properties, thereby promoting polymer foamability. When the EC content reached 0.6 wt%, lightweight foams with the highest initial expansion ratio (<em>R</em><sub>v</sub>) of 48.4 were produced before shrinkage. N<sub>2</sub> was introduced as a co-blowing agent to reduce shrinkage of the PBAT foams, resulting in the production of a microcellular foam with a stable <em>R</em><sub>v</sub> of 12.9. EC improved the foamability of PBAT while also introducing the co-blowing agent N<sub>2</sub> to resist shrinkage. These findings can serve as valuable insights for the large-scale production of lightweight biodegradable foams.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"214 ","pages":"Article 106391"},"PeriodicalIF":3.4,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142097068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-22DOI: 10.1016/j.supflu.2024.106388
Júlia C. Kessler - , Isabel M. Martins , Yaidelin A. Manrique , Alírio E. Rodrigues , Maria Filomena Barreiro , Madalena M. Dias
Moringa oleifera L. extracts (Mo) have attracted attention as a sustainable and effective alternative to synthetic ingredients for cosmetic formulations. The unique and diverse phytochemical profile of the Mo tree enhances the quality and appeal of commercial products, as evidenced by numerous studies and patents. Supercritical carbon dioxide extraction (SFE-CO2) is particularly advantageous for this purpose, offering enhanced thermostability and selectivity of extracted compounds compared to conventional methods. This review examines the safety and efficacy of Mo seed, leaf, and root extracts as cosmetic ingredients, focusing on their bioavailability and performance by considering the thermodynamics and operational benefits of SFE-CO2. The collected data highlights the method’s efficiency in terms of the total extraction yield and the recovery of target compounds from Mo, providing insights from optimisation studies and linking the solvation power of supercritical CO2 with the significant non-polar and low-polar compounds present in Mo extracts.
{"title":"Advancements in conventional and supercritical CO2 extraction of Moringa oleifera bioactives for cosmetic applications: A review","authors":"Júlia C. Kessler - , Isabel M. Martins , Yaidelin A. Manrique , Alírio E. Rodrigues , Maria Filomena Barreiro , Madalena M. Dias","doi":"10.1016/j.supflu.2024.106388","DOIUrl":"10.1016/j.supflu.2024.106388","url":null,"abstract":"<div><p><em>Moringa oleifera</em> L. extracts (Mo) have attracted attention as a sustainable and effective alternative to synthetic ingredients for cosmetic formulations. The unique and diverse phytochemical profile of the Mo tree enhances the quality and appeal of commercial products, as evidenced by numerous studies and patents. Supercritical carbon dioxide extraction (SFE-CO<sub>2</sub>) is particularly advantageous for this purpose, offering enhanced thermostability and selectivity of extracted compounds compared to conventional methods. This review examines the safety and efficacy of Mo seed, leaf, and root extracts as cosmetic ingredients, focusing on their bioavailability and performance by considering the thermodynamics and operational benefits of SFE-CO<sub>2</sub>. The collected data highlights the method’s efficiency in terms of the total extraction yield and the recovery of target compounds from Mo, providing insights from optimisation studies and linking the solvation power of supercritical CO<sub>2</sub> with the significant non-polar and low-polar compounds present in Mo extracts.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"214 ","pages":"Article 106388"},"PeriodicalIF":3.4,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0896844624002237/pdfft?md5=5e983ad8cc9d243bcb3b8a7aecab4d67&pid=1-s2.0-S0896844624002237-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142083256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-17DOI: 10.1016/j.supflu.2024.106376
Runfeng Xiao , Jing Cao , Liang Chen , Zixin Zhang , Bin Ye , Yijie Cai , Yu Hou
Supercritical cryogenic fluids exhibit significant potential for diverse applications across various industries, including liquid air energy storage, high-temperature superconducting cables, and hypersonic vehicle engine cooling. Heat transfer deterioration (HTD) poses a substantial risk to the system safety. In this study, we constructed an experimental system and performed numerical simulations to illustrate buoyancy (Bu) and thermal acceleration (Ac) effects on HTD of supercritical nitrogen (SCN2). The newly established thresholds for buoyancy and thermal acceleration (Buth=1.8×10−4 and Acth=4.4×10−5), considering pseudo two-phase characteristics, can effectively capture buoyancy and thermal acceleration in the first and second HTD regions. The first region is influenced by the combined effect of buoyancy and thermal acceleration, while the second region is mainly influenced by thermal acceleration. The new correlations and thresholds accurately predict the occurrence of HTD and the peak position. The experimental and simulation results contribute to understanding the impact of buoyancy and thermal acceleration on SCN2 HTD.
{"title":"Experimental and numerical study on the heat transfer deterioration of supercritical nitrogen in a vertical tube","authors":"Runfeng Xiao , Jing Cao , Liang Chen , Zixin Zhang , Bin Ye , Yijie Cai , Yu Hou","doi":"10.1016/j.supflu.2024.106376","DOIUrl":"10.1016/j.supflu.2024.106376","url":null,"abstract":"<div><p>Supercritical cryogenic fluids exhibit significant potential for diverse applications across various industries, including liquid air energy storage, high-temperature superconducting cables, and hypersonic vehicle engine cooling. Heat transfer deterioration (HTD) poses a substantial risk to the system safety. In this study, we constructed an experimental system and performed numerical simulations to illustrate buoyancy (<strong>Bu</strong>) and thermal acceleration (<strong>Ac</strong>) effects on HTD of supercritical nitrogen (SCN<sub>2</sub>). The newly established thresholds for buoyancy and thermal acceleration (<strong>Bu</strong><sub>th</sub>=1.8×10<sup>−4</sup> and <strong>Ac</strong><sub>th</sub>=4.4×10<sup>−5</sup>), considering pseudo two-phase characteristics, can effectively capture buoyancy and thermal acceleration in the first and second HTD regions. The first region is influenced by the combined effect of buoyancy and thermal acceleration, while the second region is mainly influenced by thermal acceleration. The new correlations and thresholds accurately predict the occurrence of HTD and the peak position. The experimental and simulation results contribute to understanding the impact of buoyancy and thermal acceleration on SCN<sub>2</sub> HTD.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"214 ","pages":"Article 106376"},"PeriodicalIF":3.4,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142097191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-13DOI: 10.1016/j.supflu.2024.106378
Amal Ayad , Mojgan Ebrahiminejadhasanabadi , Wayne Michael Nelson , Latifa Negadi , Paramespri Naidoo
The solubility of carbon dioxide in two solvents, 2,5-dimethylfuran and methyl levulinate, were measured to high pressure, up to 9.1 MPa, at three different temperatures (283.15, 303.15 and 323.15) K. The new data were measured using both the isothermal synthetic technique and the variable volume synthetic method. Two methods were utilised to provide a level of data validation. The uncertainties in the measured data were critically estimated. The experimental phase equilibrium data were modeled using the Peng-Robinson equation of state and the Wong-Sandler mixing rule with a single set of binary interaction parameters for each system. The data indicated that the solubility of carbon dioxide in both 2,5-dimethylfuran and methyl levulinate at high pressures was relatively low, suggesting a low capacity of these biofuels to dissolve carbon dioxide at high pressure.
{"title":"High-pressure phase equilibrium for carbon dioxide solubility with biofuels: Experimental and thermodynamic insights in 2,5-dimethylfuran and methyl levulinate","authors":"Amal Ayad , Mojgan Ebrahiminejadhasanabadi , Wayne Michael Nelson , Latifa Negadi , Paramespri Naidoo","doi":"10.1016/j.supflu.2024.106378","DOIUrl":"10.1016/j.supflu.2024.106378","url":null,"abstract":"<div><p>The solubility of carbon dioxide in two solvents, 2,5-dimethylfuran and methyl levulinate, were measured to high pressure, up to 9.1 MPa, at three different temperatures (283.15, 303.15 and 323.15) K. The new data were measured using both the isothermal synthetic technique and the variable volume synthetic method. Two methods were utilised to provide a level of data validation. The uncertainties in the measured data were critically estimated. The experimental phase equilibrium data were modeled using the Peng-Robinson equation of state and the Wong-Sandler mixing rule with a single set of binary interaction parameters for each system. The data indicated that the solubility of carbon dioxide in both 2,5-dimethylfuran and methyl levulinate at high pressures was relatively low, suggesting a low capacity of these biofuels to dissolve carbon dioxide at high pressure.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"214 ","pages":"Article 106378"},"PeriodicalIF":3.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142049560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, pressurized hot water extraction (PHWE) was evaluated for the recovery of anti-diabetic borapetoside C (BPC) from T. crispa stems. The maximum BPC extraction efficiency obtained at 100 ˚C, 2.5 MPa and 5.0 mL/min was considerably higher than that obtained by the conventional methods. Under optimized conditions, one-site kinetic desorption model could most accurately describe the PHWE behavior, suggesting an intra-particle diffusion-controlled mechanism. The undesirable compounds in the extract were further removed by micelle-mediated separation (MMS), in which Tween 80 was added, followed by NaCl addition and slight temperature increase to induce phase separation. At the most suitable MMS condition, with 0.028 mM Tween 80, 0.4 M NaCl, at 85 ˚C, the majority (87 %) of BPC could be recovered in the aqueous phase after 40 min. After MMS, the resulting extract exhibited low cytotoxicity against L6 and HepG2 cells while maintaining significant α-glucosidase and α-amylase inhibition activities.
{"title":"Enhancing anti-diabetic activity and reducing cytotoxicity of T. crispa extracts through sustainable approach of pressurized hot water extraction and micelle-mediated separation","authors":"Kunat Suktham , Suvimol Surassmo , Chaisak Chansriniyom , Motonobu Goto , Artiwan Shotipruk","doi":"10.1016/j.supflu.2024.106377","DOIUrl":"10.1016/j.supflu.2024.106377","url":null,"abstract":"<div><p>In this study, pressurized hot water extraction (PHWE) was evaluated for the recovery of anti-diabetic borapetoside C (BPC) from <em>T. crispa</em> stems. The maximum BPC extraction efficiency obtained at 100 ˚C, 2.5 MPa and 5.0 mL/min was considerably higher than that obtained by the conventional methods. Under optimized conditions, one-site kinetic desorption model could most accurately describe the PHWE behavior, suggesting an intra-particle diffusion-controlled mechanism. The undesirable compounds in the extract were further removed by micelle-mediated separation (MMS), in which Tween 80 was added, followed by NaCl addition and slight temperature increase to induce phase separation. At the most suitable MMS condition, with 0.028 mM Tween 80, 0.4 M NaCl, at 85 ˚C, the majority (87 %) of BPC could be recovered in the aqueous phase after 40 min. After MMS, the resulting extract exhibited low cytotoxicity against L6 and HepG2 cells while maintaining significant α-glucosidase and α-amylase inhibition activities.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"214 ","pages":"Article 106377"},"PeriodicalIF":3.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142021314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-12DOI: 10.1016/j.supflu.2024.106375
Chenchen Zhou, Hui Jin, Zhiwei Ge, Liejin Guo
K2CO3 has a good catalytic effect in supercritical water gasification (SCWG) of coal. However, researchers have mainly focused on the effects of coal gasification, while the potassium mass transfer process has rarely been studied. Herein, the distribution pattern of potassium during the SCWG of coal and the factors influencing potassium deactivation were experimentally obtained. Through the detection and analysis of the residues after the SCWG of coal, it is found that potassium only exists in the forms of liquid and solid and the potassium in the residue exists in the form of insoluble potassium silica alumina, which does not have a catalytic effect. At a high reaction temperature, the reaction time is longer, and when the silica–aluminum content in coal is higher, the potassium deactivate rate is also higher. The molar contents of potassium and aluminum in the coal gasification residue are linearly correlated, with a ratio of approximately 1:1. Reducing the aluminum content in coal can effectively reduce potassium deactivation. In the SCWG of the Hebi coal, the deactivation rate of potassium reduced from 80.88 % to 17.75 % after acid washing. In the SCWG of the ash-free coal, the carbon gasification efficiency (CE) and potassium content in the liquid were above 95 % after each experiment, there was no deactivation of potassium, and the residual potassium solution remained catalytically effective after the SCWG of the ash-free coal.
{"title":"Study of potassium deactivation rule in supercritical water gasification of coal with K2CO3 as catalyst","authors":"Chenchen Zhou, Hui Jin, Zhiwei Ge, Liejin Guo","doi":"10.1016/j.supflu.2024.106375","DOIUrl":"10.1016/j.supflu.2024.106375","url":null,"abstract":"<div><p>K<sub>2</sub>CO<sub>3</sub> has a good catalytic effect in supercritical water gasification (SCWG) of coal. However, researchers have mainly focused on the effects of coal gasification, while the potassium mass transfer process has rarely been studied. Herein, the distribution pattern of potassium during the SCWG of coal and the factors influencing potassium deactivation were experimentally obtained. Through the detection and analysis of the residues after the SCWG of coal, it is found that potassium only exists in the forms of liquid and solid and the potassium in the residue exists in the form of insoluble potassium silica alumina, which does not have a catalytic effect. At a high reaction temperature, the reaction time is longer, and when the silica–aluminum content in coal is higher, the potassium deactivate rate is also higher. The molar contents of potassium and aluminum in the coal gasification residue are linearly correlated, with a ratio of approximately 1:1. Reducing the aluminum content in coal can effectively reduce potassium deactivation. In the SCWG of the Hebi coal, the deactivation rate of potassium reduced from 80.88 % to 17.75 % after acid washing. In the SCWG of the ash-free coal, the carbon gasification efficiency (CE) and potassium content in the liquid were above 95 % after each experiment, there was no deactivation of potassium, and the residual potassium solution remained catalytically effective after the SCWG of the ash-free coal.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"214 ","pages":"Article 106375"},"PeriodicalIF":3.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141978449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1016/j.supflu.2024.106373
Mariana Fortunatti-Montoya , Pablo E. Hegel , Selva Pereda
In this work, we measure the density and viscosity of CO2 saturated orange peel oil liquid mixtures under moderated pressure for the purpose of supercritical process engineering design. A high-pressure falling weight viscometer is used to measure the viscosity of saturated liquid mixtures of orange oil + CO2 at different temperatures (293 K to 333 K) and saturated pressures (2 MPa to 10.3 MPa). An important variation of viscosity (0.35.10−3 Pa.s to 1.10 10−3 Pa.s) is reported in the range of operating conditions. Results show the operating temperature influences the viscosity of both the pure oil and the CO2-saturated oily substrates. The new viscosity data correlates with a simple Arrhenius modified type model.
在这项工作中,我们测量了二氧化碳饱和橘皮油液体混合物在适度压力下的密度和粘度,目的是进行超临界工艺工程设计。我们使用高压失重式粘度计测量了橘子油 + CO2 饱和液体混合物在不同温度(293 K 至 333 K)和饱和压力(2 MPa 至 10.3 MPa)下的粘度。据报告,在工作条件范围内,粘度的变化很大(0.35.10-3 Pa.s 至 1.10 10-3 Pa.s)。结果表明,工作温度会影响纯油和二氧化碳饱和油基的粘度。新的粘度数据与简单的阿伦尼斯改进型模型相关。
{"title":"Density and viscosity of orange peel oil saturated with pressurized CO2","authors":"Mariana Fortunatti-Montoya , Pablo E. Hegel , Selva Pereda","doi":"10.1016/j.supflu.2024.106373","DOIUrl":"10.1016/j.supflu.2024.106373","url":null,"abstract":"<div><p>In this work, we measure the density and viscosity of CO<sub>2</sub> saturated orange peel oil liquid mixtures under moderated pressure for the purpose of supercritical process engineering design. A high-pressure falling weight viscometer is used to measure the viscosity of saturated liquid mixtures of orange oil + CO<sub>2</sub> at different temperatures (293 K to 333 K) and saturated pressures (2 MPa to 10.3 MPa). An important variation of viscosity (0.35.10<sup>−3</sup> Pa.s to 1.10 10<sup>−3</sup> Pa.s) is reported in the range of operating conditions. Results show the operating temperature influences the viscosity of both the pure oil and the CO<sub>2</sub>-saturated oily substrates. The new viscosity data correlates with a simple Arrhenius modified type model.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"214 ","pages":"Article 106373"},"PeriodicalIF":3.4,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141992976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work aimed to obtain extracts from Costus spicatus leaves through ultrasonic pretreatment in supercritical CO2 extraction (UAE+SFE). A central composite design was used to evaluate the influence of temperature (36–64 °C), pressure (8–20 MPa), and cosolvent (0–20 %w) in terms of overall yield and chemical composition. Morphology using scanning electron micrograph (SEM), total phenolic content, content of total flavonoid, antioxidant (DPPH and ABTS), and antibacterial activities were evaluated. UAE+SFE showed a more notable overall yield, with 6.97 %. In the SEM, the sample treated with UAE+SFE significantly impacted tissue structures, improving the selectivity of SFE regarding linolenic acid, leading to a maximum composition value of 62.5 % area according to GC-MS. Furthermore, the UAE+SFE extract exhibited strong antimicrobial activity compared to the extract obtained by the SFE technique. Based on the pioneering results, the bioactives obtained are promising and interesting for application in the cosmetic, pharmaceutical, and food industries.
{"title":"Ultrasound pretreatment combined with supercritical CO2 extraction of Costus spicatus leaf extract","authors":"Thaíris Karoline Silva Laurintino , Thuany Naiara Silva Laurintino , Deise Parolo Tramontin , Alexandre Bella Cruz , Debora Wainstein Paiva , Ariovaldo Bolzan , Marintho Bastos Quadri","doi":"10.1016/j.supflu.2024.106372","DOIUrl":"10.1016/j.supflu.2024.106372","url":null,"abstract":"<div><p>This work aimed to obtain extracts from <em>Costus spicatus</em> leaves through ultrasonic pretreatment in supercritical CO<sub>2</sub> extraction (UAE+SFE). A central composite design was used to evaluate the influence of temperature (36–64 °C), pressure (8–20 MPa), and cosolvent (0–20 %w) in terms of overall yield and chemical composition. Morphology using scanning electron micrograph (SEM), total phenolic content, content of total flavonoid, antioxidant (DPPH and ABTS), and antibacterial activities were evaluated. UAE+SFE showed a more notable overall yield, with 6.97 %. In the SEM, the sample treated with UAE+SFE significantly impacted tissue structures, improving the selectivity of SFE regarding linolenic acid, leading to a maximum composition value of 62.5 % area according to GC-MS. Furthermore, the UAE+SFE extract exhibited strong antimicrobial activity compared to the extract obtained by the SFE technique. Based on the pioneering results, the bioactives obtained are promising and interesting for application in the cosmetic, pharmaceutical, and food industries.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"213 ","pages":"Article 106372"},"PeriodicalIF":3.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141915316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Farmed large yellow croaker fish have stronger fishy smell and less tender texture than wild-caught ones, mostly caused by the high fat accumulation from aquaculture feeding patterns. To improve the commercial value of fillets, this study investigated a mild subcritical fluid treatment with subcritical butane (SBE) and dimethyl ether (SDME). Changes in the chemical compositions, volatile flavor compounds (VFCs) and protein denaturation were determined for 1–5 h treatments. The results showed 24 % and 44 % defatting levels under SBE and SDME treatment, respectively. GC-MS showed that SDME could induce a significant reduction of total VFC content, especially for the dominant aldehydes. There was less n-nonanal (14.65–40.13 mg/kg) and octanal content (1.67–7.21 mg/kg), no detection of trans, trans-2,4-decadienal in the SDME treated samples in comparison to those treated with SBE. The results showed that SDME treatment for 3 h had the best defatting effect, good deodorization effect and less degradation of fish protein.
{"title":"Effect of mild subcritical fluid treatment on meat quality of farmed large yellow croakers","authors":"Wenjie Wang , Danqing Jiang , Xiubiao Chen , Xuxia Zhou , Yuting Ding","doi":"10.1016/j.supflu.2024.106370","DOIUrl":"10.1016/j.supflu.2024.106370","url":null,"abstract":"<div><p>Farmed large yellow croaker fish have stronger fishy smell and less tender texture than wild-caught ones, mostly caused by the high fat accumulation from aquaculture feeding patterns. To improve the commercial value of fillets, this study investigated a mild subcritical fluid treatment with subcritical butane (SBE) and dimethyl ether (SDME). Changes in the chemical compositions, volatile flavor compounds (VFCs) and protein denaturation were determined for 1–5 h treatments. The results showed 24 % and 44 % defatting levels under SBE and SDME treatment, respectively. GC-MS showed that SDME could induce a significant reduction of total VFC content, especially for the dominant aldehydes. There was less n-nonanal (14.65–40.13 mg/kg) and octanal content (1.67–7.21 mg/kg), no detection of trans, trans-2,4-decadienal in the SDME treated samples in comparison to those treated with SBE. The results showed that SDME treatment for 3 h had the best defatting effect, good deodorization effect and less degradation of fish protein.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"214 ","pages":"Article 106370"},"PeriodicalIF":3.4,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142077011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-05DOI: 10.1016/j.supflu.2024.106371
Xiaodan Wang , Pu Yang , Ruidong Li , Guohu Tong , Jukai Chen , Yueshe Wang
The electrochemical corrosion behavior of X80 carbon steel was investigated in a supercritical CO2 (sCO2) environment at 60 ℃ and 9 MPa, by in-situ experiments and density functional theory (DFT) calculations, revealing the corrosion mechanism. For in situ electrochemical measurements, two novel CO2-rich and H2O-rich cells were developed to replace the traditional three-electrode cell. Electrochemical impedance spectroscopy revealed distinct differences in the corrosion behavior between CO2-rich and H2O-rich environments during the later stages of testing. In H2O-rich environments, as corrosion time increased, the corrosion product layer gradually changed from porous to dense, eventually forming a protective layer. In CO2-rich environments, corrosion occurs mainly in areas where water condenses to form FeCO3. Simultaneously, microscopic calculations provided evidence for the three-step sCO2 hydrolysis mechanism and the formation of FeCO3 products.
通过原位实验和密度泛函理论(DFT)计算,研究了 X80 碳钢在 60 ℃ 和 9 MPa 的超临界 CO(sCO)环境中的电化学腐蚀行为,揭示了腐蚀机理。为进行原位电化学测量,开发了两种新型富含 CO 和 HO 的电池,以取代传统的三电极电池。电化学阻抗光谱显示,在测试的后期阶段,富含 CO 和富含 HO 环境中的腐蚀行为存在明显差异。在富含 HO 的环境中,随着腐蚀时间的延长,腐蚀产物层逐渐从多孔变为致密,最终形成保护层。在富含 CO 的环境中,腐蚀主要发生在水冷凝形成 FeCO 的区域。同时,微观计算为三步 sCO 水解机制和 FeCO 产物的形成提供了证据。
{"title":"Investigation of supercritical CO2 corrosion behavior of X80 carbon steel in pipelines: An in situ experimental and DFT study","authors":"Xiaodan Wang , Pu Yang , Ruidong Li , Guohu Tong , Jukai Chen , Yueshe Wang","doi":"10.1016/j.supflu.2024.106371","DOIUrl":"10.1016/j.supflu.2024.106371","url":null,"abstract":"<div><p>The electrochemical corrosion behavior of X80 carbon steel was investigated in a supercritical CO<sub>2</sub> (sCO<sub>2</sub>) environment at 60 ℃ and 9 MPa, by in-situ experiments and density functional theory (DFT) calculations, revealing the corrosion mechanism. For in situ electrochemical measurements, two novel CO<sub>2</sub>-rich and H<sub>2</sub>O-rich cells were developed to replace the traditional three-electrode cell. Electrochemical impedance spectroscopy revealed distinct differences in the corrosion behavior between CO<sub>2</sub>-rich and H<sub>2</sub>O-rich environments during the later stages of testing. In H<sub>2</sub>O-rich environments, as corrosion time increased, the corrosion product layer gradually changed from porous to dense, eventually forming a protective layer. In CO<sub>2</sub>-rich environments, corrosion occurs mainly in areas where water condenses to form FeCO<sub>3</sub>. Simultaneously, microscopic calculations provided evidence for the three-step sCO<sub>2</sub> hydrolysis mechanism and the formation of FeCO<sub>3</sub> products.</p></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"213 ","pages":"Article 106371"},"PeriodicalIF":3.4,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141915317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}