1
|
Tang Z, Peng H, Mei P, Huang F, Yi S, Feng F. Performance Analysis of Ferronickel Slag-Ordinary Portland Cement Pervious Concrete. Materials (Basel) 2024; 17:1628. [PMID: 38612143 PMCID: PMC11012781 DOI: 10.3390/ma17071628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Revised: 03/09/2024] [Accepted: 03/28/2024] [Indexed: 04/14/2024]
Abstract
It is unknown whether Ferronickel slag (FNS)-ordinary Portland cement (OPC)-based pervious concrete (FOPC) is feasible. To this end, a feasibility study was conducted on FOPC. Firstly, a detailed microscopic examination of the FNS powder was conducted, encompassing analyses of its particle size distribution, SEM, EDS, and chemical composition. These analyses aimed to establish the suitability of a composite of FNS and OPC as a composite cementitious material. Subsequent experimentation focused on evaluating the compressive strength of the composite paste material with varying mixed proportions, revealing a slight reduction in strength as the FNS substitution rate increased. Furthermore, the study designed eighteen different mix proportions of FOPC to investigate the key physical properties, including porosity, density, compressive strength, and the coefficient of permeability. Findings indicated that increases in the cementitious material proportion correlate with enhanced concrete strength, where the ratio of cementitious to aggregate increased by 6.7% and 16.5%, and the strength of FOPC increased by 10-13% and 30-50%, respectively. Conversely, a rise in the FNS substitution rate led to a reduction in compressive strength across different mix ratios. Additionally, the ratio of paste material to aggregate was found to significantly influence the permeability coefficient. These comprehensive performance evaluations suggest that incorporating FNS into OPC for pervious concrete applications is a feasible approach, offering valuable insights for the promotion of waste reuse and the advancement of energy conservation and emissions reduction efforts.
Collapse
Affiliation(s)
- Zhongping Tang
- Institute of Structural Material Failure and Strengthening Technology, Ningbo Polytechnic, 388 East Lushan Rd., Ningbo 315800, China;
- National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Central South University of Forestry and Technology, 498 South Shaoshan Rd., Changsha 410075, China;
| | - Hua Peng
- National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Central South University of Forestry and Technology, 498 South Shaoshan Rd., Changsha 410075, China;
| | - Pingbo Mei
- Zhoushan National Ocean Fisheries Base Infrastructure Construction and Development Co., Ltd., 1 Shanghui Rd., Zhoushan 316291, China
| | - Fanglin Huang
- School of Civil Engineering, Central South University, 22 South Shaoshan Rd., Changsha 410075, China
| | - Shixiang Yi
- Institute of Structural Material Failure and Strengthening Technology, Ningbo Polytechnic, 388 East Lushan Rd., Ningbo 315800, China;
| | - Fan Feng
- School of Architectural Engineering, Hunan Institute of Engineering, Xiangtan 411100, China;
| |
Collapse
|
2
|
Liu Q, Li H, Cao Q, Ke D, Yin S, Li Q. Microscopic Factors Affecting the Performance of Pervious Concrete. Materials (Basel) 2024; 17:1479. [PMID: 38611994 PMCID: PMC11012483 DOI: 10.3390/ma17071479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 03/19/2024] [Accepted: 03/21/2024] [Indexed: 04/14/2024]
Abstract
The impacts of various aggregate particle sizes and cement contents on the internal structure of pervious concrete were investigated. Accordingly, test blocks with different aggregate particle sizes and cement contents were dissected and photographed. Subsequently, the captured images were processed using the ImageJ software (1.53i) to analyze the profiles of the test blocks and identify the internal mesoscopic parameters of the pervious concrete. This study discusses the relationship between microscopic parameters and macroscopic factors based on experimental results. It also fits functional equations linking the permeability coefficient with pore parameters, matrix parameters, and compressive strength. The results indicated that, as the aggregate size increased, the internal pore diameter of the pervious concrete increased, whereas the total area and width of the cement matrix decreased. This resulted in a low permeability coefficient and high compressive strength of the test block. Increasing the cement content in pervious concrete reduced the porosity and increased the width and area of the internal matrix. Consequently, the permeability coefficient decreased, and the compressive strength of the test block increased.
Collapse
Affiliation(s)
- Qin Liu
- School of Architecture and Engineering, Chang’an University, Xi’an 710061, China; (H.L.); (Q.C.); (D.K.)
| | - Hu Li
- School of Architecture and Engineering, Chang’an University, Xi’an 710061, China; (H.L.); (Q.C.); (D.K.)
| | - Qianli Cao
- School of Architecture and Engineering, Chang’an University, Xi’an 710061, China; (H.L.); (Q.C.); (D.K.)
| | - Di Ke
- School of Architecture and Engineering, Chang’an University, Xi’an 710061, China; (H.L.); (Q.C.); (D.K.)
| | - Shiyang Yin
- School of Water Resources and Hydroelectric Engineering, North China Electric Power University, Beijing 102206, China;
| | - Qinpeng Li
- Shandong Urban Rural Planning and Design Research Institute Co., Ltd., Jinan 250014, China;
| |
Collapse
|
3
|
Cao Q, Zhou J, Xu W, Yuan X. Study on the Preparation and Properties of Vegetation Lightweight Porous Concrete. Materials (Basel) 2024; 17:251. [PMID: 38204103 PMCID: PMC10779460 DOI: 10.3390/ma17010251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/27/2023] [Accepted: 12/28/2023] [Indexed: 01/12/2024]
Abstract
The objective of this study is to formulate vegetated light porous concrete (VLPC) through the utilization of various cementing materials, the design of porosity, and the incorporation of mineral additives. Subsequently, the study aims to assess and analyze key properties, including the bulk density, permeability coefficient, mechanical characteristics, and alkalinity. The findings indicate a linear decrease in the volume weight of VLPC as the designed porosity increases. While higher design porosity elevates the permeability coefficient, the measured effective porosity closely aligns with the design values. The examined VLPC exhibits a peak compressive strength of 17.7 MPa and a maximum bending strength of 2.1 MPa after 28 days. Notably, an escalation in porosity corresponds to a decrease in both the compressive and the bending strength of VLPC. Introducing mineral additives, particularly silicon powder, is shown to be effective in enhancing the strength of VLPC. Furthermore, substituting slag sulfonate cement for ordinary cement significantly diminishes the alkalinity of VLPC, resulting in a pH below 8.5 at 28 days. Mineral additives also contribute to a reduction in the pH of concrete. Among them, silica fume, fly ash, fly ash + slag powder, and slag powder exhibit a progressively enhanced alkaline reduction effect.
Collapse
Affiliation(s)
- Qingyu Cao
- MMC Group, Central Research Institute of Building and Construction, Beijing 10088, China;
| | - Juncheng Zhou
- School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
| | - Weiting Xu
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
| | - Xiongzhou Yuan
- School of Traffic and Environment, Shenzhen Institute of Information Technology, Shenzhen 518172, China
| |
Collapse
|
4
|
Dong Z, Wan Y, Wang P, Chen Z, He X, Hui X. Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils. Environ Technol 2023; 44:4371-4379. [PMID: 35730580 DOI: 10.1080/09593330.2022.2093136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/17/2022] [Indexed: 06/15/2023]
Abstract
Compacted cement-bound soils (CCS) are widely used as leakage barriers around solid waste landfills and contaminated sites. However, a study of its long-term reliability in an acidic environment is relatively scarce. A 3-year-long experimental study on the changes in permeability coefficient and microstructure of CCS under acid attack was conducted, from which the following conclusions can be drawn: the permeability coefficient of CCS under weak acid (pH = 5.00) attack decreased progressively with time, from 4.90 × 10-8 cm/s at the beginning to 6.70 × 10-10 cm/s after 3 years. Under strongly acidic environments with pH values of 2.65 and 3.65, the permeability coefficients of CCS initially decreased and then increased with time, reaching 6.70 × 10-5 and 9.37 × 10-8 cm/s, respectively. The degradation effect of a weak acid (pH = 5.00) on the hydration products of cement was mild as a large amount of hydration products (e.g. C-S-H shaped in short fibrous) remained in the pores of CCS after 3 years of immersion. However, strong acid caused an obvious degradation effect on the hydration products, which almost disappeared after 3 years of immersion. Based on the study data, a unified mathematical model was developed to correlate the permeability coefficient of CCS, immersion time and acidic solution pH value. Furthermore, a quantitative expression function between the service life of CCS and solution pH value was established.
Collapse
Affiliation(s)
- Zhiwei Dong
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Yong Wan
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Ping Wang
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Zhen Chen
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, People's Republic of China
- IRSM-CAS/HK PolyU Joint Laboratory on Solid Waste Science, Wuhan, People's Republic of China
| | - Xingxing He
- State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Xinminnan Hui
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, People's Republic of China
| |
Collapse
|
5
|
Yan D, Lai L, Xiao X, Zhang L, Zhao Z, Zhao J. Water Consolidation Performance of Acrylic-Polymer-Modified Materials and Their Concrete Impermeability Repair Characteristics. Gels 2023; 9:764. [PMID: 37754445 PMCID: PMC10531126 DOI: 10.3390/gels9090764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/12/2023] [Accepted: 09/14/2023] [Indexed: 09/28/2023] Open
Abstract
Acrylic materials exhibit favorable grouting repair performance. However, their curing products are easily inclined to drying shrinkage, and their concrete impermeability repair characteristics have seldom been investigated. To improve material properties, reveal the impermeability repair mechanism, and address drying shrinkage, this study proposed the addition of styrene-acrylate copolymer emulsion (styrene-acrylic emulsion) to the grouting material to prepare two-component acrylate grouting materials. Using orthogonal and single-factor tests combined with physical and mechanical properties, the mechanical properties and impermeability repair performance (physical and mechanical properties combined) of grouting materials were analyzed and studied, and the optimal ratio of each component of acrylate grouting materials was determined. Results show that (1) the hydrogel produced by the reaction of sodium methacrylate with hydroxyethyl acrylate has good physical and mechanical properties. (2) With the increase in the accelerator dosage, the setting time of slurry initially decreases and then increases; as the initiator dosage increases, the setting time of slurry decreases, which is negatively correlated with the initiator dosage. (3) Talcum powder can improve the physical and chemical properties of gel and enhance the reliability and durability of acrylate grouting materials, and the comprehensive performance is the best at a dosage of 3%. (4) Styrene-acrylic emulsion can increase the solid content and reduce the volume drying shrinkage when added to grouting materials. The fractured impermeable specimens were repaired by grouting with prepared acrylate grouting materials and cured for 24 h for the impermeability test, and the water pressure for the 24 h impermeability repair was 1.0 MPa. This study's results provide important reference and basis for revealing the impermeability principle of acrylate grouting materials and evaluating their impermeability.
Collapse
Affiliation(s)
- Dong Yan
- College of Architecture and Civil Engineering, Xinyang Normal University, Xinyang 464000, China;
- Xinyang Lingshi Technology Co., Ltd., Xinyang 464000, China;
- Henan New Environmentally-Friendly Civil Engineering Materials Engineering Research Center, Xinyang Normal University, Xinyang 464000, China
- Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China;
| | - Lipeng Lai
- College of Architecture and Civil Engineering, Xinyang Normal University, Xinyang 464000, China;
| | - Xuedang Xiao
- Xinyang Lingshi Technology Co., Ltd., Xinyang 464000, China;
| | - Lei Zhang
- Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China;
| | - Zilong Zhao
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519000, China
| | - Jun Zhao
- College of Civil engineering, Zhengzhou University, Zhengzhou, 450001, China;
| |
Collapse
|
6
|
Chen J, Yu S, Huang W, Wang H. Two-Dimensional Microstructure-Based Model for Evaluating the Permeability Coefficient of Heterogeneous Construction Materials. Materials (Basel) 2023; 16:5892. [PMID: 37687585 PMCID: PMC10488672 DOI: 10.3390/ma16175892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 08/23/2023] [Accepted: 08/24/2023] [Indexed: 09/10/2023]
Abstract
The permeability coefficient of construction materials plays a crucial role in engineering quality and durability. In this study, a microstructure model based on real aggregate shape and digital image technology is proposed to predict the permeability coefficient of concrete. A two-dimensional, three-component finite element model of cement concrete was established considering the interfacial transition zone (ITZ) between aggregate and mortar. The permeability coefficient prediction model was developed by the finite element method. The accuracy of the model was verified by experimental data, and the influence of the water-cement ratio on the permeability coefficient of concrete was analyzed. The results show that this method has good prediction accuracy with a relative error of 1.73%. According to the verified model, the influences of aggregate content, aggregate characteristics, aggregate location, ITZ thickness, and other factors on the permeability of concrete were explored. The higher the water-cement ratio, the higher the permeability coefficient. With the increase in aggregate content, the permeability coefficient decreases. Aggregate permeability has a significant influence on the effective permeability coefficient of concrete within a certain range. The greater the roundness of aggregate, the greater the permeability of concrete. On the contrary, the larger aggregate size causes lower permeability. The permeability coefficient of concrete with segregation is lower than that with uniform distribution. At the same time, the permeability increases with the increase of ITZ thickness.
Collapse
Affiliation(s)
- Jiaqi Chen
- Department of Civil Engineering, Central South University, Changsha 410075, China; (J.C.)
| | - Shujun Yu
- Department of Civil Engineering, Central South University, Changsha 410075, China; (J.C.)
| | - Wei Huang
- Department of Civil and Environmental Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Hao Wang
- Department of Civil and Environmental Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| |
Collapse
|
7
|
Gu J, Ren Q, Tao M, Han Y, Zhang L. Permeability Coefficient of Concrete under Complex Stress States. Materials (Basel) 2023; 16:4368. [PMID: 37374552 DOI: 10.3390/ma16124368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 05/26/2023] [Accepted: 06/12/2023] [Indexed: 06/29/2023]
Abstract
Hydraulic structures are typically subjected to long-term hydraulic loading, and concrete-the main material of structures-may suffer from cracking damage and seepage failure, which can threaten the safety of hydraulic structures. In order to assess the safety of hydraulic concrete structures and realize the accurate analysis of the whole failure process of hydraulic concrete structures under the coupling effect of seepage and stress, it is vital to comprehend the variation law of concrete permeability coefficients under complex stress states. In this paper, several concrete samples were prepared, designed for loading conditions of confining pressures and seepage pressures in the first stage, and axial pressures in the later stage, to carry out the permeability experiment of concrete materials under multi-axial loading, followed by the relationships between the permeability coefficients and axial strain, and the confining and seepage pressures were revealed accordingly. In addition, during the application of axial pressure, the whole process of seepage-stress coupling was divided into four stages, describing the permeability variation law of each stage and analyzing the causes of its formation. The exponential relationship between the permeability coefficient and volume strain was established, which can serve as a scientific basis for the determination of permeability coefficients in the analysis of the whole failure process of concrete seepage-stress coupling. Finally, this relationship formula was applied to numerical simulation to verify the applicability of the above experimental results in the numerical simulation analysis of concrete seepage-stress coupling.
Collapse
Affiliation(s)
- Jiafeng Gu
- College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
| | - Qingwen Ren
- Department of Engineering Mechanics, Hohai University, Nanjing 211100, China
| | - Mei Tao
- College of Civil and Architecture Engineering, Chuzhou University, Chuzhou 239000, China
| | - Yan Han
- Department of Engineering Mechanics, Hohai University, Nanjing 211100, China
| | - Linfei Zhang
- College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
| |
Collapse
|
8
|
Yang J, Ren WX, Kang B, Tao Y. Experimental investigation on chemical clogging mechanism of loose porous media in recharge process of groundwater heat pump. Environ Technol 2023; 44:2357-2373. [PMID: 34962183 DOI: 10.1080/09593330.2021.2024275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 12/23/2021] [Indexed: 06/08/2023]
Abstract
Groundwater heat pumps (GWHP) are an efficient utilisation of shallow geothermal energy technology and of great significance in terms of promoting energy conservation and reducing emissions. However, recharge clogging has been a key problem restricting the continuous operation of GWHP. In this study, a simulation test device for sand column was designed with the aim of addressing chemical clogging induced by heat pump reinjection in a porous saline aquifer in the Huaibei Plain, China. The trend in the variation of the permeability coefficient was studied based on the detection of the sand sample composition, recharge water quality, and sand layer temperature, and the cause of formation was analysed using the saturation index (SI) and ion ratio method. The results indicated that the permeability coefficient in the sand column decreased exponentially, with a maximum and minimum decrease of 8.14% and 71.65% of the original coefficient, respectively, found in sections P2-P3 and P8-P9. Therefore, the clogging effect of the aquifer at approximately 200-400 mm from the recharge well was significant. Water-rock interactions predominantly involved the dissolution of halite, albite, chlorite, anhydrite, and dolomite and the precipitation of calcite, as well as the exchange adsorption of Ca2+ and Mg2+ to Na+, which were the key sources of ions during the water chemical evolution process. Finally, quartz was formed by the weathering and dissolution of aluminosilicate minerals such as albite, and particle migration and precipitation during the hydrodynamic disturbance were the primary causes of the front-end blockage of the column.
Collapse
Affiliation(s)
- Jie Yang
- College of Civil Engineering, Hefei University of Technology, Hefei, People's Republic of China
- School of Architecture and Civil Engineering, West Anhui University, Lu'an, People's Republic of China
| | - Wei-Xin Ren
- College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, People's Republic of China
| | - Bo Kang
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, People's Republic of China
| | - Yuezan Tao
- College of Civil Engineering, Hefei University of Technology, Hefei, People's Republic of China
| |
Collapse
|
9
|
Liang M, Jin C, Hou J, Wang M, Shi Y, Dong Z, Yang X, Zhou J, Cai J. Research and Application of High-Pressure Rotary Jet Method in the Seepage Treatment of Heavy Metal Tailing Ponds of Southwest China. Materials (Basel) 2023; 16:ma16093450. [PMID: 37176333 PMCID: PMC10180357 DOI: 10.3390/ma16093450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 04/23/2023] [Accepted: 04/26/2023] [Indexed: 05/15/2023]
Abstract
The developed karst caves may become the seepage channels of heavy metal to the soil and underground water in Southwest China. Therefore, it is necessary to apply effective seepage treatments to the base of heavy metal tailing reservoirs. This paper addressed the high-pressure rotary jet technology and slurry systems used in the seepage treatment of the deep tailing sand of the Shenxiandong tailing pond located in Southwest China. In this study, the factors of fluidity, initial and final setting times, compressive strength, and permeability coefficient of the slurry were conducted. The mechanism analysis was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and inductively coupled plasma-mass spectrometry (ICP-MS). Three different types of slurry systems were proposed, and the permeability coefficients of the solidification body following 28 days of curing were less than 1 × 10-7 cm/s. The concentrations of Pb and Zn in the slurry system containing bentonite were reduced by 26.2% and 45.7%, respectively. In the presence of slaked lime and fly ash, the concentrations of Pb and Zn could be reduced by 26.8% and 30%, respectively. A total of 2142 high-pressure rotary jet piles were completed by the high-pressure rotary jet method in the field trial. The diffusion radius of these piles was over 1 m. Following 28 days of curing, the solidification body's compressive strength was 7.45 MPa and the permeability coefficient was 6.27 × 10-8 cm/s. Both the laboratory and on-site trials showed that this method produced a good pollution barrier effect, which could prevent the diffusion of heavy metal into the adjacent underground water through the karst caves. It is also an effective way of engineering technology concerning heavy metal pollution control that occurs in tailing ponds.
Collapse
Affiliation(s)
- Mengjia Liang
- Faculty of Engineering, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| | - Chunzheng Jin
- Faculty of Engineering, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| | - Jiwu Hou
- Faculty of Engineering, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| | - Mengyuan Wang
- Faculty of Engineering, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| | - Yanping Shi
- Faculty of Engineering, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| | - Zichao Dong
- School of Environmental Studies, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| | - Xianyu Yang
- Faculty of Engineering, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| | - Jianwei Zhou
- School of Environmental Studies, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| | - Jihua Cai
- Faculty of Engineering, China University of Geosciences, No. 388, Lu Mo Road, Wuhan 430074, China
| |
Collapse
|
10
|
Viswanadhan Vasantha P, Sherafudeen SP, Rahamathulla M, Mathew ST, Murali S, Alshehri S, Shakeel F, Alam P, Sirhan AY, Narayana Iyer BA. Combination of Cellulose Derivatives and Chitosan-Based Polymers to Investigate the Effect of Permeation Enhancers Added to In Situ Nasal Gels for the Controlled Release of Loratadine and Chlorpheniramine. Polymers (Basel) 2023; 15:polym15051206. [PMID: 36904447 PMCID: PMC10006938 DOI: 10.3390/polym15051206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/17/2023] [Accepted: 02/21/2023] [Indexed: 03/08/2023] Open
Abstract
The purpose of the study is to develop and assess mucoadhesive in situ nasal gel formulations of loratadine and chlorpheniramine maleate to advance the bioavailability of the drug as compared to its conventional dosage forms. The influence of various permeation enhancers, such as EDTA (0.2% w/v), sodium taurocholate (0.5% w/v), oleic acid (5% w/v), and Pluronic F 127 (10% w/v), on the nasal absorption of loratadine and chlorpheniramine from in situ nasal gels containing different polymeric combinations, such as hydroxypropyl methylcellulose, Carbopol 934, sodium carboxymethylcellulose, and chitosan, is studied. Among these permeation enhancers, sodium taurocholate, Pluronic F127 and oleic acid produced a noticeable increase in the loratadine in situ nasal gel flux compared with in situ nasal gels without permeation enhancer. However, EDTA increased the flux slightly, and in most cases, the increase was insignificant. However, in the case of chlorpheniramine maleate in situ nasal gels, the permeation enhancer oleic acid only showed a noticeable increase in flux. Sodium taurocholate and oleic acid seems to be a better and efficient enhancer, enhancing the flux > 5-fold compared with in situ nasal gels without permeation enhancer in loratadine in situ nasal gels. Pluronic F127 also showed a better permeation, increasing the effect by >2-fold in loratadine in situ nasal gels. In chlorpheniramine maleate in situ nasal gels with EDTA, sodium taurocholate and Pluronic F127 were equally effective, enhancing chlorpheniramine maleate permeation. Oleic acid has a better effect as permeation enhancer in chlorpheniramine maleate in situ nasal gels and showed a maximum permeation enhancement of >2-fold.
Collapse
Affiliation(s)
- Prasanth Viswanadhan Vasantha
- Department of Pharmaceutics, Mount Zion College of Pharmaceutical Sciences and Research, Chayalode P.O. Ezhamkulam, Pathanamthitta Dist, Adoor 691556, India
- Correspondence: (P.V.V.); (M.R.)
| | - Sheri Peedikayil Sherafudeen
- Department of Pharmaceutics, Mar Discorous College of Pharmacy, Alathara, Sreekariyam, Thiruvananthapuram Dist, Thiruvananthapuram 695017, India
| | - Mohamed Rahamathulla
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Al Faraa, P.O. Box 62223, Abha 61421, Saudi Arabia
- Correspondence: (P.V.V.); (M.R.)
| | | | - Sandhya Murali
- Department of Pharmaceutics, Mount Zion College of Pharmaceutical Sciences and Research, Chayalode P.O. Ezhamkulam, Pathanamthitta Dist, Adoor 691556, India
| | - Sultan Alshehri
- Department of Pharmaceutical Sciences, College of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia
| | - Faiyaz Shakeel
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Prawez Alam
- Department of Pharmacognosy, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
| | | | - Bhageerathy Anantha Narayana Iyer
- Department of Pharmaceutics, Mount Zion College of Pharmaceutical Sciences and Research, Chayalode P.O. Ezhamkulam, Pathanamthitta Dist, Adoor 691556, India
| |
Collapse
|
11
|
Dzięcioł J, Sas W. Perspective on the Application of Machine Learning Algorithms for Flow Parameter Estimation in Recycled Concrete Aggregate. Materials (Basel) 2023; 16:1500. [PMID: 36837130 PMCID: PMC9962052 DOI: 10.3390/ma16041500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/07/2023] [Accepted: 02/07/2023] [Indexed: 06/18/2023]
Abstract
The constantly expanding civilization and construction industry pose new challenges for a sustainable development economy. Aiming to protect the environment is often associated with waste management, thereby reducing the number of landfills. The management of recycled concrete aggregate (RCA) from building demolition and its reuse in construction perfectly fits into this trend. The characteristics of post-industrial and recycled materials are not homogeneous as is usually the case with natural materials. This leads to a search for solutions to determine the parameters in the simplest possible manner and with as few resources as possible, while eliminating estimation risks. This task can be solved using machine learning, whose algorithms are increasingly used and developed in many areas of life and industry. The research in this study is aimed at comparing the effectiveness of k-Nearest Neighbors (k-NN) and Artificial Neural Network (ANN) algorithms in determining the permeability coefficient to a linear regression model. This parameter has an important role from the perspective of the application of RCA in civil engineering, particularly in earth construction. Two different RCA materials with different origins and properties were used in the study. The filtration test for each sample was pre-prepared using different compaction energies of 0.17 and 0.59 J/cm3 and for loosely packed samples. Differences in the structures of the test results are presented for both materials. The lowest prediction errors were obtained for the k-NN model. This algorithm obtained for the training sample a coefficient of determination (R2) equal to 0.947 and for the test sample an R2 equal to 0.980. In the case of ANN, the coefficient of determination was in the range of 0.877-0.936. An important part of the study was the interpretation with SHAP of the obtained models, allowing insight into which parameters influenced the predictions. That is significant and novel, considering the heterogeneity of the materials studied, and provides a rationale for further research in this area.
Collapse
Affiliation(s)
- Justyna Dzięcioł
- Institute of Civil Engineering, Warsaw University of Life Sciences, 159 Nowoursynowska, 02-776 Warsaw, Poland
| | - Wojciech Sas
- Water Centre, Warsaw University of Life Sciences, 159 Nowoursynowska, 02-776 Warsaw, Poland
| |
Collapse
|
12
|
Oshizaka T, Inaba R, Isono M, Takei C, Takeuchi I, Mori K, Sugibayashi K. Effects of Physicochemical Properties of Constituent Ions of Ionic Liquid on Its Permeation through a Silicone Membrane. Chem Pharm Bull (Tokyo) 2022; 70:716-719. [PMID: 36184454 DOI: 10.1248/cpb.c22-00248] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ionic liquids (ILs), defined as liquid salts composed of anions and cations, have the advantage of allowing constituent ions to be stably absorbed through biological membranes, such as skin. However, limited information is currently available on the effects of the physicochemical properties of constituent ions on the membrane permeation of ILs. Therefore, we herein investigated the effects of the polarity of constituent cations on the membrane permeation of each constituent ion from IL. Various ILs were prepared by selecting lidocaine (LID) as a cation and a series of p-alkylbenzoic acids with different n-octanol/water partition coefficients (Ko/w) as anions. These ILs were applied to a skin model, a silicone membrane, and membrane permeability was investigated. The membrane permeabilities of p-alkylbenzoic acids from their single aqueous suspensions were also measured for comparison. The membrane permeability of p-alkylbenzoic acid from the aqueous suspension increased at higher Ko/w. However, the membrane permeability of ILs was similar regardless of the Ko/w of the constituent p-alkylbenzoic acid. Furthermore, the membrane permeability of the counterion LID remained unchanged regardless of the constituent p-alkylbenzoic acid. These results suggest that even when the Ko/w of IL constituents markedly differs, the resulting IL does not affect membrane permeability.
Collapse
Affiliation(s)
- Takeshi Oshizaka
- Faculty of Pharmaceutical Sciences, Josai International University
| | - Rena Inaba
- Faculty of Pharmaceutical Sciences, Josai International University
| | - Mana Isono
- Faculty of Pharmaceutical Sciences, Josai International University
| | - Chihiro Takei
- Faculty of Pharmaceutical Sciences, Josai International University
| | - Issei Takeuchi
- Faculty of Pharmaceutical Sciences, Josai International University
| | - Kenji Mori
- Faculty of Pharmaceutical Sciences, Josai International University
| | - Kenji Sugibayashi
- Faculty of Pharmaceutical Sciences, Josai International University.,Faculty of Pharmacy and Pharmaceutical Sciences, Josai University
| |
Collapse
|
13
|
Jeong YS, Jusko WJ. Consideration of Fractional Distribution Parameter f(d) in the Chen and Gross Method for Tissue-to-Plasma Partition Coefficients: Comparison of Several Methods. Pharm Res 2022; 39:463-79. [PMID: 35288804 DOI: 10.1007/s11095-022-03211-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 02/17/2022] [Indexed: 10/18/2022]
Abstract
PURPOSE The tissue-to-plasma partition coefficient (Kp) describes the extent of tissue distribution in physiologically-based pharmacokinetic (PBPK) models. Constant-rate infusion studies are common for experimental determination of the steady-state Kp,ss, while the tissue-plasma concentration ratio (CT/Cp) in the terminal phase after intravenous doses is often utilized. The Chen and Gross (C&G) method converts a terminal slope CT/Cp to Kp,ss based on assumptions of perfusion-limited distribution in tissue-plasma equilibration. However, considering blood flow (QT) and apparent tissue permeability (fupPSin) in the rate of tissue distribution, this report extends the C&G method by utilizing a fractional distribution parameter (fd). METHODS Relevant PBPK equations for non-eliminating and eliminating organs along with lung and liver were derived for the conversion of CT/Cp values to Kp,ss. The relationships were demonstrated in rats with measured CT/Cp and Kp,ss values and the model-dependent fd for 8 compounds with a range of permeability coefficients. Several methods of assessing Kp were compared. RESULTS Utilizing fd in an extended C&G method, our estimations of Kp,ss from CT/Cp were improved, particularly for lower permeability compounds. However, four in silico methods for estimating Kp performed poorly across tissues in comparison with measured Kp values. Mathematical relationships between Kp and Kp,ss that are generally applicable for eliminating organs with tissue permeability limitations necessitates inclusion of an extraction ratio (ER) and fd. CONCLUSION Since many different types/sources of Kp are present in the literature and used in PBPK models, these perspectives and equations should provide better insights in measuring and interpreting Kp values in PBPK.
Collapse
|
14
|
Shah HG, Rathod V, Basim P, Gajera B, Dave RH. Understanding the Impact of Multi-factorial Composition on Efficient Loading of the Stable Ketoprofen Nanoparticles on Orodispersible Films Using Box-Behnken Design. J Pharm Sci 2021:S0022-3549(21)00557-8. [PMID: 34678275 DOI: 10.1016/j.xphs.2021.10.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 11/21/2022]
Abstract
The purpose of the present study was to prepare Orodispersible films (ODFs) loaded with ketoprofen nanoparticles (KT-NP). The Box-Behnken design was constructed in developing and optimizing the KTF-NP-ODFs. The effect of independent variables: Soluplus® concentration (X1, stabilizer), Tween 80 concentration (X2, surfactant), and KTF concentration (X3, drug) were studied on the dependent variables: particle size (PS, Y1), zeta potential (ZP, Y2), and the polydispersity index (PDI, Y3) of the NPs, as well as on the tensile strength (TS, Y4) and permeability coefficient (PC, Y5) of the KTF-NP-ODFs. Hydroxypropyl methylcellulose (HPMC E15) and polyethylene glycol (PEG 400) were used as the film former polymer and plasticizer, respectively, and their concentrations were kept constant for all formulations. KTF-NPs were prepared by antisolvent precipitation technology. This was followed by the addition of HPMC E15 and PEG 400 to prepare the ODFs using the solvent-casting method. The PS, PDI, and ZP for all the formulations were found in the range of 94 nm to 350 nm, 0.09 to 0.438, and -21.83 mV to -8.03 mV, respectively. The TS and PC of the prepared KTF-NP-ODFs were found between 1.21 MPa to 3.93 MPa and 3.12 × 10-4 cm/h to 34.23 × 10-4 cm/h, respectively. The amorphous nature of the KTF-NP in the ODFs was confirmed by the absence of characteristic crystalline peaks and endothermic events of KTF in X-ray diffraction (XRD) and modulated differential scanning calorimetry (mDSC), respectively. The optimized formulation showed ̴ 4 times higher permeability as compared to the pure KTF. In addition, the dissolution of pure KTF and the optimized KTF-NP-ODF in pH 1.2 at the end of 60 min was found to be ̴ 30% and ̴ 95%, respectively. Conclusively, KTF-NP-ODFs can be a promising drug delivery system to counter the issues related to dysphagia and bypass the common side effects, such as the gastric irritation associated with NSAIDs like KTF.
Collapse
|
15
|
Liu J, Yang H, Zhang D, Wang Y, Xiao W, Ye C, Zheng B, Yang Y. Mechanical and permeation response characteristics of basalt fibre reinforced tailings to different reinforcement technologies: an experimental study. R Soc Open Sci 2021; 8:210669. [PMID: 34540256 PMCID: PMC8441128 DOI: 10.1098/rsos.210669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 08/20/2021] [Indexed: 06/13/2023]
Abstract
Tailings dam is a man-made hazard with high potential energy; dam failure would cause great losses to human lives and properties. However, the limitations of conventional reinforcement methods like geosynthetic make it easy to slide along the weak structural plane. In this paper, we innovatively added basalt fibre (BF) with different lengths (l) and contents (ω) into tailings to study its mechanical and permeation characteristics. The results indicate that BF can improve the shear strength (τ), cohesion (c) and compression index (Cc ) of tailings, but it has little effect on internal friction angle (φ). When l is constant, τ, c and Cc are positively correlated with ω. One notable phenomenon is that τ and c do not constantly increase with l when ω is constant, but obtain the maximum under the optimal length of 6 mm. Moreover, when ω > 0.6%, permeability coefficient (k) is greater than that of the original tailings and the sensitivity of c, φ, τ, Cc , k to fibre content is greater than that of length. The research results facilitate the understanding of BF reinforced tailings, and could serve as references for improving the safety of tailings dam and other artificial soil slopes or soil structures.
Collapse
Affiliation(s)
- Jianzhong Liu
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People's Republic of China
- School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, People's Republic of China
- China Coal Technology and Engineering Group, Beijing 100013, People's Republic of China
| | - Han Yang
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People's Republic of China
- School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Dongming Zhang
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People's Republic of China
- School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Yun Wang
- China Railway 23rd Bureau Group 6th Engineering Co. Ltd, Chongqing 401121, People's Republic of China
| | - Weijing Xiao
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People's Republic of China
- School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Chen Ye
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People's Republic of China
- School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, People's Republic of China
| | - Binbin Zheng
- School of Management Science and Engineering, Shandong Technology and Business University, Yantai 264005, Shandong, People's Republic of China
| | - Yushun Yang
- Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huai'an 223001, Jiangsu, People's Republic of China
| |
Collapse
|
16
|
Zhang J, Fu ZY, Chen HS, Lian JJ, Qin C. [Soil-epikarst structures and their hydrological characteristics on dolomite slopes in karst region of southwest China]. Ying Yong Sheng Tai Xue Bao 2021; 32:2107-2118. [PMID: 34212617 DOI: 10.13287/j.1001-9332.202106.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Epikarst is the core area of karst critical zone, with important hydrologic regulation and storage function. However, the effects of karst development degree on hydrologic characteristics of epikasrt is still unclear. We used geophysical exploration and hydrogeological techniques, combined with the dynamic monitoring of moisture and water levels, to quantify the karst development degrees and their hydrologic characteristics on slope lands. We analyzed the responses of soil-epikarst systems to rainfall. Results showed that geophysical exploration technology could be well applied to the detection of surface-subsurface structures in the karst areas. The average thickness of soil and surface karst zone on the slope was less than 0.63 m and 2.60 m, respectively. The slopes of strong-karstification characterized by high apparent resistivity, well-developed joint fractures, and strong permeability (0.73 m·d-1). Such a result indicated that epikarst could regulate precipitation. The responses of soil moisture had a larger rainfall threshold (>20.50 mm·d-1) and the water level was determined by rainfall amount. In contrast, the slope with weak-karstification had low apparent resistivity and weak permeability (0.07 m·d-1). Moisture and water level were sensitive to rainfall. Karst channels were developed locally at 240-300 cm with a permeability coefficient of up to 432 mm·d-1. Obvious preferential flow was observed in extreme rainfall events on this slope, which could induce flood disaster in the adjacent depression. Our results would provide scientific basis for further research on water resources regulation, management, and eco-hydrology in karst areas of southwest China.
Collapse
Affiliation(s)
- Jun Zhang
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.,Huangjiang Observation and Research Station of Karst Ecosystem, Chinese Academy of Sciences, Huangjiang 547100, Guangxi, China.,University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Yong Fu
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.,Huangjiang Observation and Research Station of Karst Ecosystem, Chinese Academy of Sciences, Huangjiang 547100, Guangxi, China
| | - Hong-Song Chen
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.,Huangjiang Observation and Research Station of Karst Ecosystem, Chinese Academy of Sciences, Huangjiang 547100, Guangxi, China
| | - Jin-Jiao Lian
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.,Huangjiang Observation and Research Station of Karst Ecosystem, Chinese Academy of Sciences, Huangjiang 547100, Guangxi, China
| | - Chang Qin
- Guangxi Hydrogeology and Engineering Geology Institute, Liuzhou 545006, Guangxi, China
| |
Collapse
|
17
|
Huang W, Liu X, Zhang S, Zheng Y, Ding Q, Tong B. Performance-Guided Design of Permeable Asphalt Concrete with Modified Asphalt Binder Using Crumb Rubber and SBS Modifier for Sponge Cities. Materials (Basel) 2021; 14:ma14051266. [PMID: 33800035 PMCID: PMC7962129 DOI: 10.3390/ma14051266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 02/28/2021] [Accepted: 03/02/2021] [Indexed: 11/16/2022]
Abstract
The construction of sponge city is a major green innovation to implement the concept of sustainable development. In this study, the road performance of permeable asphalt concrete (PAC), which displays pronounced water permeability and noise reduction that are favorable for sponge cities, has been improved with a two-fold modification using styrene–butadiene–styrene (SBS) and crumb rubber (CR). Four percent SBS and three different ratios (10%, 15%, and 20%) of CR have been used to modify the virgin asphalt binder. The Marshall design has been followed to produce PAC samples. To evaluate the asphalt binder performance, multiple-stress creep-recovery (MSCR) test, linear amplitude sweep (LAS) test, and engineering property test programs including softening point test, penetration test, and rotational viscosity test have been conducted. Freeze–thaw splitting test, Hamburg wheel-tracking test, resilient modulus test, and permeability coefficient test have been performed to evaluate the asphalt mixture performance. The test results show that the addition of SBS and CR reduces the permeability coefficient, but significantly improves the high temperature performance, fatigue performance, and rutting resistance as well as the resilient modulus. However, the optimum rubber content should not exceed 15%. Meanwhile, after adding CR and SBS modifier, the indirect tensile strength (ITS) and tensile strength ratio (TSR) increase. It indicates that the moisture stability and crack resistance have been improved by the composite modification effect.
Collapse
Affiliation(s)
- Wentong Huang
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (W.H.); (Y.Z.); (Q.D.); (B.T.)
| | - Xiao Liu
- School of Architecture, South China University of Technology, Guangzhou 510641, China
- Architectural Design & Research Institute Co., Ltd., South China University of Technology, Guangzhou 510641, China
- State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China;
- Correspondence:
| | - Shaowei Zhang
- State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China;
| | - Yu Zheng
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (W.H.); (Y.Z.); (Q.D.); (B.T.)
| | - Qile Ding
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (W.H.); (Y.Z.); (Q.D.); (B.T.)
| | - Bin Tong
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (W.H.); (Y.Z.); (Q.D.); (B.T.)
| |
Collapse
|
18
|
Wu K, Kuo C, Tu T. A Highly Reproducible Micro U-Well Array Plate Facilitating High-Throughput Tumor Spheroid Culture and Drug Assessment. Glob Chall 2021; 5:2000056. [PMID: 33552551 PMCID: PMC7857131 DOI: 10.1002/gch2.202000056] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 09/30/2020] [Indexed: 05/05/2023]
Abstract
3D multicellular tumor spheroids (MCTSs) have recently emerged as a landmark for cancer research due to their inherent traits that are physiologically relevant to primary tumor microenvironments. A facile approach-laser-ablated micro U-wells-has been widely adopted in the past decade. However, the differentiation of microwell uniformities and the construction of arrays have all remained elusive. Herein, an improved laser-ablated microwell array technique is proposed that can not only achieve arrayed MCTSs with identical sizes but can also perform high-throughput drug assessments in situ. Three critical laser ablation parameters, including frequency, duty cycle, and pulse number, are investigated to generate microwells flexibly with a range from 170 to 400 μm. The choice of microwells is optimally arranged into an array via precise control of horizontal spacing (d x) and vertical spacing (d y) amenable of cell-loss-free culture during cell seeding. Harvested T24, A549 and Huh-7 MCTSs from the microwell array correspond to approximately 75 to 140 μm in diameter. Anticancer drug screening of cisplatin validated IC50 values in 2D and MCTS conditions are 3.5 versus 9.1 μM (T24), 11.8 versus 277.7 μM (A549) and 33.5 versus 52.8 μM (Huh-7), and the permeability is measured to range from 0.042 to 0.58 μm min-1.
Collapse
Affiliation(s)
- Kuang‐Wei Wu
- Department of Biomedical EngineeringNational Cheng Kung UniversityTainan70101Taiwan
| | - Ching‐Te Kuo
- Department of Mechanical and Electro‐Mechanical EngineeringNational Sun Yat‐sen UniversityKaohsiung80400Taiwan
| | - Ting‐Yuan Tu
- Department of Biomedical EngineeringNational Cheng Kung UniversityTainan70101Taiwan
- Medical Device Innovation CenterNational Cheng Kung UniversityTainan70101Taiwan
- International Center for Wound Repair and RegenerationNational Cheng Kung UniversityTainan70101Taiwan
| |
Collapse
|
19
|
Skutnik Z, Sobolewski M, Koda E. An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures. Materials (Basel) 2020; 13:ma13245624. [PMID: 33321700 PMCID: PMC7763752 DOI: 10.3390/ma13245624] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/03/2020] [Accepted: 12/07/2020] [Indexed: 11/16/2022]
Abstract
This study presents a flow pump technique usually used for evaluating the permeability of soils, which was, for first time, applied to measure the water permeability of concrete. Additionally, a new easy-to-apply method to determine permeability is proposed, based on a modification of Valenta’s formula. In the calculations, the apparent air content of concrete mixes was taken into account. An additional purpose of the conducted research was to determine the influence of a new generation of polycarboxylate superplasticizer and chemically active admixtures on the permeability, compressive strength, and other properties of concrete. The following four types of concrete were tested: concrete without admixtures, concrete with an admixture to increase the compressive strength, concrete with a superplasticizer, and concrete containing two admixtures simultaneously. The results showed that the proposed method allows to obtain reliable measurements within a very short period of time. The obtained results confirmed that new method may be very useful in engineering practice, particularly in terms of the watertightness of hydrotechnical concretes and the properties of the concretes used in bridge construction, underground parts of office buildings, or sealed tanks.
Collapse
|
20
|
García-Salvador A, Domínguez-Monedero A, Gómez-Fernández P, García-Bilbao A, Carregal-Romero S, Castilla J, Goñi-de-Cerio F. Evaluation of the Influence of Astrocytes on In Vitro Blood-Brain Barrier Models. Altern Lab Anim 2020; 48:184-200. [PMID: 33136430 DOI: 10.1177/0261192920966954] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In vitro blood-brain barrier (BBB) models are a useful tool to screen the permeability and toxicity of new drugs. Currently, many different in vitro BBB models coexist, but none stands out as being notably better than the rest. Therefore, there is still a need to evaluate the quality of BBB models under various conditions and assess their ability to mimic the in vivo situation. In this study, two brain endothelial cell lines (bEnd.3 and hCMEC/D3) and two epithelial-like cell lines (MDCKII and Caco-2) were selected for BBB modelling purposes. They were grown as monolayers of a single cell type, under the following conditions: in coculture with either primary or immortalised astrocytes; or in the presence of primary or immortalised astrocyte-derived conditioned media. A total of 20 different BBB models were established in this manner, in order to assess the effects of the astroglial components on the BBB phenotype in each case. To this end, six parameters were studied: the expression of selected tight junction proteins; the enzyme activities of alkaline phosphatase and of gamma glutamyl transpeptidase; the transendothelial/transepithelial electrical resistance (TEER); restriction in paracellular transport; and efflux transporter inhibition were each evaluated and correlated. The results showed that coculturing with either primary or immortalised astrocytes led to a general improvement in all parameters studied, evidencing the contribution of this cell type to effective BBB formation. Furthermore, the permeability coefficient (P e) of the tracer molecule, Lucifer Yellow, correlated with three of the six parameters studied. In addition, this study highlights the potential for the use of the Lucifer Yellow P e value as an indicator of barrier integrity in in vitro BBB models, which could be useful for screening the permeability of new drugs.
Collapse
Affiliation(s)
- Adrián García-Salvador
- 73049GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), Zamudio, Bizkaia, Spain
| | - Alazne Domínguez-Monedero
- 73049GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), Zamudio, Bizkaia, Spain
| | - Paloma Gómez-Fernández
- 73049GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), Zamudio, Bizkaia, Spain
| | - Amaia García-Bilbao
- 73049GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), Zamudio, Bizkaia, Spain
| | - Susana Carregal-Romero
- Molecular and Functional Biomarkers Group, 90216CIC biomaGUNE (BRTA), Donostia-San Sebastián, Spain
- CIBER de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Joaquín Castilla
- 73038CIC bioGUNE (BRTA), Derio, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | - Felipe Goñi-de-Cerio
- 73049GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), Zamudio, Bizkaia, Spain
| |
Collapse
|
21
|
Zhu H, Wen C, Wang Z, Li L. Study on the Permeability of Recycled Aggregate Pervious Concrete with Fibers. Materials (Basel) 2020; 13:E321. [PMID: 31936714 DOI: 10.3390/ma13020321] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 12/31/2019] [Accepted: 01/08/2020] [Indexed: 11/17/2022]
Abstract
Pervious concrete is considered to be porous concrete because of its pore structure and excellent permeability. In general, larger porosity will increase the permeability coefficient, but will significantly decrease the compressive strength. The effects of water-cement ratio, fiber types, and fiber content on the permeability coefficient, porosity, compressive strength, and flexural strength were investigated. The pore tortuosity of the pervious concrete was determined by volumetric analysis and two-dimensional cross-sectional image analysis. The concept and calculation method of porosity tortuosity were further proposed. Results show that the permeability coefficient of the pervious concrete is the most suitable with a water-cement ratio of 0.30; the water permeability of the pervious concrete is influenced by fiber diameter. The permeability coefficient of pervious concrete with polypropylene thick fiber (PPTF) is greater than that with copper coated steel fiber (CCF) and the polypropylene fiber (PPF). The permeability coefficient is related to tortuosity and porosity, but when porosity is the same, the permeability coefficient may be different. Finally, general relations between the permeability coefficient and porosity tortuosity are constructed.
Collapse
|
22
|
Jin Q, Cui X, Su J, Lu T, Wang J, Han R. Author Response to Comment on: Laboratory Measurement and Analysis of the Deteriorated Layer Permeability Coefficient of Soil-Cement Deteriorated in a Saline Environment. Materials (Basel) 2020; 13:E207. [PMID: 31947788 DOI: 10.3390/ma13010207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Accepted: 12/31/2019] [Indexed: 11/17/2022]
Abstract
The authors thank Rui Neves for his discussions related to our work. Errors in the formula have been corrected as suggested by the discusser and data in the article have also been revised.
Collapse
|
23
|
Jin Q, Cui X, Su J, Lu T, Wang J, Han R. Laboratory Measurement and Analysis of the Deteriorated Layer Permeability Coefficient of Soil-Cement Deteriorated in a Saline Environment. Materials (Basel) 2019; 12:ma12142245. [PMID: 31336841 PMCID: PMC6678846 DOI: 10.3390/ma12142245] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 07/04/2019] [Accepted: 07/08/2019] [Indexed: 11/29/2022]
Abstract
The deterioration of soil-cement in a saline environment leads to a reduction in strength and an increase in permeability. Effective methods of determining the deteriorated layer permeability coefficient of soil-cement are currently lacking. A laboratory test method for measuring the permeability coefficient of the deteriorated layer was proposed using the modified permeability coefficient testing apparatus. According to the proposed method, the permeability coefficient of the deteriorated layer could be obtained after testing the permeability coefficient of the soil-cement specimen in acuring room and testing the equivalent permeability coefficient and deterioration depth of the soil-cement specimen in a deteriorated environment. Using the marine dredger fill from Jiaozhou Bay as a case study, the deteriorated layer permeability coefficients of soil-cements with different cement contents were tested. It turned out that the permeability of the deteriorated layer increases with age. At the beginning of the curing age, higher cement content led to a smaller permeability coefficient of the deteriorated layer of soil-cement. As the curing age increased, the deteriorated layer permeability coefficient of the soil-cement with higher cement content increased. The evolution of the permeability coefficient of a deteriorated layer with age can be formulated as the Logistic function. This study provides support for anti-permeability designs of soil-cement structures in saline environments.
Collapse
Affiliation(s)
- Qing Jin
- School of Civil Engineering, Shandong University, Jinan 250061, China
| | - Xinzhuang Cui
- School of Civil Engineering, Shandong University, Jinan 250061, China.
| | - Junwei Su
- School of Civil Engineering, Shandong University, Jinan 250061, China
| | - Tu Lu
- School of Civil Engineering, Shandong University, Jinan 250061, China
| | - Jieru Wang
- School of Civil Engineering, Shandong University, Jinan 250061, China
| | - Ruonan Han
- School of Civil Engineering, Shandong University, Jinan 250061, China
| |
Collapse
|
24
|
Lanevskij K, Didziapetris R. Physicochemical QSAR Analysis of Passive Permeability Across Caco-2 Monolayers. J Pharm Sci 2018; 108:78-86. [PMID: 30321548 DOI: 10.1016/j.xphs.2018.10.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/05/2018] [Accepted: 10/05/2018] [Indexed: 11/17/2022]
Abstract
Caco-2 cell line is frequently used as a simplified in vitro model of intestinal absorption. In this study, a database of 1366 Caco-2 permeability coefficients (Pe) for 768 diverse drugs and drug-like compounds was compiled from public sources. The collected data represent permeation rates measured at varying experimental conditions (pH from 4.0 to 8.0, and stirring rates from 0 to >1000 rpm) that presumably account for passive diffusion across mucosal epithelium. These data were subjected to multistep nonlinear regression analysis using a minimal set of physicochemical descriptors (octanol-water log D, pKa, hydrogen bonding potential, and molecular size). The model was constructed in a mechanistic manner incorporating the following components: (i) a hydrodynamic equation of size- and charge-specific along with nonspecific diffusion across the paracellular pathway; (ii) transcellular diffusion represented by thermodynamic membrane/water partitioning ratio; (iii) stirring-dependent limit of maximum achievable permeability due to the presence of unstirred water layer. The obtained model demonstrates good accuracy of log Pe predictions with a residual mean square error <0.5 log units for all training and validation sets. Given its robust performance and straightforward interpretation in terms of simple physicochemical properties, the proposed model may serve as a valuable tool to guide drug discovery efforts toward readily absorbable compounds.
Collapse
Affiliation(s)
- Kiril Lanevskij
- VšĮ"Aukštieji algoritmai", A.Mickevičiaus 29, LT-08117 Vilnius, Lithuania; ACD/Labs, Inc., 8 King Street East, Toronto, Ontario M5C 1B5, Canada.
| | - Remigijus Didziapetris
- VšĮ"Aukštieji algoritmai", A.Mickevičiaus 29, LT-08117 Vilnius, Lithuania; ACD/Labs, Inc., 8 King Street East, Toronto, Ontario M5C 1B5, Canada
| |
Collapse
|
25
|
Patel RD, Prasanth Kumar S, Pandya HA, Solanki HA. MDCKpred: a web-tool to calculate MDCK permeability coefficient of small molecule using membrane-interaction chemical features. Toxicol Mech Methods 2018; 28:685-698. [PMID: 29998769 DOI: 10.1080/15376516.2018.1499840] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Structure-based models to understand the transport of small molecules through biological membrane can be developed by enumerating intermolecular interactions of the small molecule with a biological membrane, usually a dimyristoylphosphatidylcholine (DMPC) monolayer. This ADME (absorption, distribution, metabolism, and excretion) property based on Madin-Darby Canine Kidney (MDCK) cell line demonstrates intestinal drug absorption of small molecules and correlated to human intestinal absorption which acts as a determining factor to forecast small-molecule prioritization in drug-discovery projects. We present here the development of MDCKpred web-tool which calculates MDCK permeability coefficient of small molecule based on the regression model, developed using membrane-interaction chemical features. The web-tool allows users to calculate the MDCK permeability coefficient (nm/s) instantly by providing simple descriptor inputs. The chemical-interaction features are derived from different parts of the DMPC molecule viz. head, middle, and tail regions and accounts overall intermolecular contacts of the small molecule when passively diffused through the phospholipid-rich biological membrane. The MDCKpred model is both internally (R2 = .76; [Formula: see text]= .68; Rtrain = .87; Rtest = .69) and externally (Rext = .55) validated. Furthermore, we used natural molecules as application examples to demonstrate its utility in lead exploration and optimization projects. The MDCKpred web-tool can be accessed freely at http://www.mdckpred.in . This web-tool is designed to offer an intuitive way of prioritizing small molecules based on calculated MDCK permeabilities.
Collapse
Affiliation(s)
- Rikin D Patel
- a Department of Bioinformatics, Applied Botany Centre (ABC), University School of Sciences , Gujarat University , Ahmedabad , India
| | | | - Himanshu A Pandya
- a Department of Bioinformatics, Applied Botany Centre (ABC), University School of Sciences , Gujarat University , Ahmedabad , India
| | - Hitesh A Solanki
- a Department of Bioinformatics, Applied Botany Centre (ABC), University School of Sciences , Gujarat University , Ahmedabad , India
| |
Collapse
|
26
|
Abstract
A landfill is one of the main sites for disposal of municipal solid waste and the current landfill disposal system faces several problems. For instance, excessive leachate water is an important factor leading to landfill instability. Understanding the permeability characteristics of municipal solid waste is a relevant topic in the field of environmental geotechnical engineering. In this paper, the current research progress on permeability characteristics of municipal solid waste is discussed. A review of recent studies indicates that the research in this field is divided into two categories based on the experimental method employed: field tests and laboratory tests. This paper summarizes test methods, landfill locations, waste ages, dry densities and permeability coefficients across different studies that focus on permeability characteristics. Additionally, an experimental study on compressibility and permeability characteristics of fresh municipal solid waste under different effective stresses and compression times was carried out. Moreover, the relationships between the permeability coefficient and effective stress as well as dry density were obtained and a permeability prediction model was established. Finally, the experimental results from the existing literature and this paper were compared and the effects of effective stress and dry density on the permeability characteristics of municipal solid waste were summarized. This study provides the basis for analysis of leachate production in a landfill.
Collapse
Affiliation(s)
- Zhenying Zhang
- School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yingfeng Wang
- School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, China
| | - Hui Xu
- School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yuehua Fang
- School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, China
| | - Dazhi Wu
- School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, China
| |
Collapse
|
27
|
Abstract
In the present study, carbon nanotube (CNT) membranes were prepared to predict skin penetration properties of compounds. A series of penetration experiments using Franz diffusion cells were performed with 16 different membrane compositions for model chemicals. Similar experiments were also carried out with same model molecules using five different commercially available synthetic membranes and human skins for the comparison. Model chemicals were selected as diclofenac, dexketoprofen and salicylic acid. Their permeability coefficients and flux values were calculated. Correlations between permeability values of model compounds for human skins and developed model membranes were investigated. Good correlations were obtained for CNT membrane, isopropyl myristate-treated CNT membrane (IM-CNT membrane) and bovine serum albumin-cholesterol, dipalmitoyl phosphatidyl choline-treated membrane (BSA-Cholesterol-DPPC-IM-CNT membrane). An artificial neural network (ANN) model was developed using some molecular properties and penetration coefficients from pristine CNT membranes to predict skin permeability values and quite good predictions were made.
Collapse
Affiliation(s)
- Sibel Ilbasmis-Tamer
- a Faculty of Pharmacy, Department of Pharmaceutical Technology , Gazi University , Etiler , Ankara , Turkey
| | - Fatmanur Tugcu-Demiroz
- a Faculty of Pharmacy, Department of Pharmaceutical Technology , Gazi University , Etiler , Ankara , Turkey
| | - Ismail Tuncer Degim
- a Faculty of Pharmacy, Department of Pharmaceutical Technology , Gazi University , Etiler , Ankara , Turkey
| |
Collapse
|
28
|
Abstract
The structure and composition of the round window membrane (RWM) make it a particularly effective pathway for drug delivery to the inner ear. Therefore, predicting the efficiency of RWM transport would provide useful information for enhancing local application. In the present study, a mathematical model was established to achieve this goal. A series of drugs with different physicochemical properties were introduced in the inner ear cavity of guinea pigs via RWM by intratympanic application. The perilymphatic drug concentration (C) data were used to calculate the permeability coefficient (Kp) of different drugs diffusing through the RWM. The experimental data were fitted using the Matlab software to set up the numerical model based on Fick's diffusion law and the single-compartment model following extravascular administration, which facilitated the prediction of the permeation profiles of different drugs while trans-RWM. In summary, this mathematical model is a contribution toward developing potentially useful RWM administration simulating tools.
Collapse
Affiliation(s)
- Yue Zhang
- a School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou , China
| | - Huanpeng Su
- a School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou , China
| | - Lu Wen
- a School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou , China
| | - Fan Yang
- a School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou , China
| | - Gang Chen
- a School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou , China
| |
Collapse
|
29
|
Shah MV, van Mastrigt O, Heijnen JJ, van Gulik WM. Transport and metabolism of fumaric acid in Saccharomyces cerevisiae in aerobic glucose-limited chemostat culture. Yeast 2016; 33:145-61. [PMID: 26683700 DOI: 10.1002/yea.3148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 12/11/2015] [Accepted: 12/11/2015] [Indexed: 11/08/2022] Open
Abstract
Currently, research is being focused on the industrial-scale production of fumaric acid and other relevant organic acids from renewable feedstocks via fermentation, preferably at low pH for better product recovery. However, at low pH a large fraction of the extracellular acid is present in the undissociated form, which is lipophilic and can diffuse into the cell. There have been no studies done on the impact of high extracellular concentrations of fumaric acid under aerobic conditions in S. cerevisiae, which is a relevant issue to study for industrial-scale production. In this work we studied the uptake and metabolism of fumaric acid in S. cerevisiae in glucose-limited chemostat cultures at a cultivation pH of 3.0 (pH < pK). Steady states were achieved with different extracellular levels of fumaric acid, obtained by adding different amounts of fumaric acid to the feed medium. The experiments were carried out with the wild-type S. cerevisiae CEN.PK 113-7D and an engineered S. cerevisiae ADIS 244 expressing a heterologous dicarboxylic acid transporter (DCT-02) from Aspergillus niger, to examine whether it would be capable of exporting fumaric acid. We observed that fumaric acid entered the cells most likely via passive diffusion of the undissociated form. Approximately two-thirds of the fumaric acid in the feed was metabolized together with glucose. From metabolic flux analysis, an increased ATP dissipation was observed only at high intracellular concentrations of fumarate, possibly due to the export of fumarate via an ABC transporter. The implications of our results for the industrial-scale production of fumaric acid are discussed.
Collapse
Affiliation(s)
- Mihir V Shah
- Department of Biotechnology, Delft University of Technology, The Netherlands
| | | | - Joseph J Heijnen
- Department of Biotechnology, Delft University of Technology, The Netherlands
| | - Walter M van Gulik
- Department of Biotechnology, Delft University of Technology, The Netherlands
| |
Collapse
|
30
|
Zhao Q, Wei H, He Y, Ren Q, Zhou C. Evaluation of ultrasound and glucose synergy effect on the optical clearing and light penetration for human colon tissue using SD-OCT. J Biophotonics 2014; 7:938-947. [PMID: 24458608 DOI: 10.1002/jbio.201300141] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2013] [Revised: 11/18/2013] [Accepted: 12/02/2013] [Indexed: 06/03/2023]
Abstract
Topical application optical clearing agents (OCAs) can effectively enhance the tissue optical clearing on the human colon tissue, which has been demonstrated in our previous studies. Nevertheless, the strong light scattering still limits the diffusion rate of OCAs and penetration depth of light into the tissue. In this study, in order to further increase the diffusion of the OCA of glucose into tissue, we employ a method to improve the glucose permeability and light penetration with ultrasound (sonophoretic delivery, SP) and glucose (G) synergy on human normal and cancerous colon tissues in vitro, which was measured and quantified with spectral-domain optical coherence tomography (SD-OCT) technology. To evaluate the effect of ultrasound mediation, the percentages of OCT signal enhancement (PSE) and 1/e light-penetration depth were calculated for G alone and ultrasound-G treatments. The PSE was calculated at approximately 313 μm from the sample tissue surface. For normal and cancerous colon tissues the PSE were about 91.1 ± 10.6% and 65.3% ± 12.3% with 30% G/SP, but for the 30% G alone treatment it was about 78.6 ± 11.2% and 54.5% ± 9.3%, respectively. The max value of 1/e light-penetration depth for normal colon tissue was 0.47 ± 0.02 mm with 30% G alone and 0.60 ± 0.05 mm (p < 0.05)with 30% G/SP synergy. However, for the cancerous colon tissue the max value was 0.45 ± 0.01 mm and 0.57 ± 0.03 mm (p < 0.05), respectively. The obtained permeability coefficients showed a significant enhancement with ultrasound mediation. The mean permeability coefficients of 30% G/SP in normal and cancerous colon tissues were (6.3 ± 0.16) × 10(-6) cm/s and (12.1 ± 0.34) × 10(-6) cm/s (p < 0.05), respectively. These preliminary experiments showed that ultrasound can effectively enhance the tissue optical clearing and glucose diffusion rate as well as increase the light-penetration depth into biotissues.
Collapse
Affiliation(s)
- Qingliang Zhao
- School of Biomedical Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, China
| | | | | | | | | |
Collapse
|
31
|
Abstract
An ability to estimate the maximum flux of a xenobiotic across skin is desirable from the perspective of both drug delivery and toxicology. While there is an abundance of mathematical models describing the estimation of drug permeability coefficients, there are relatively few that focus on the maximum flux. This article reports and evaluates a simple and easy-to-use predictive model for the estimation of maximum transdermal flux of xenobiotics based on three common molecular descriptors: logarithm of octanol-water partition coefficient, molecular weight and melting point. The use of all three can be justified on the theoretical basis of their influence on the solute aqueous solubility and the partitioning into the stratum corneum lipid domain. The model explains 81% of the variability in the permeation data set composed of 208 entries and can be used to obtain a quick estimate of maximum transdermal flux when experimental data is not readily available.
Collapse
Affiliation(s)
- Mikolaj Milewski
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40536-0082, USA
| | - Audra L. Stinchcomb
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40536-0082, USA
| |
Collapse
|