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Qu T, Nan G, Ouyang Y, Bieketuerxun B, Yan X, Qi Y, Zhang Y. Structure-Property Relationship, Glass Transition, and Crystallization Behaviors of Conjugated Polymers. Polymers (Basel) 2023; 15:4268. [PMID: 37959948 PMCID: PMC10649048 DOI: 10.3390/polym15214268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 11/15/2023] Open
Abstract
Conjugated polymers have gained considerable interest due to their unique structures and promising applications in areas such as optoelectronics, photovoltaics, and flexible electronics. This review focuses on the structure-property relationship, glass transition, and crystallization behaviors of conjugated polymers. Understanding the relationship between the molecular structure of conjugated polymers and their properties is essential for optimizing their performance. The glass transition temperature (Tg) plays a key role in determining the processability and application of conjugated polymers. We discuss the mechanisms underlying the glass transition phenomenon and explore how side-chain interaction affects Tg. The crystallization behavior of conjugated polymers significantly impacts their mechanical and electrical properties. We investigate the nucleation and growth processes, as well as the factors that influence the crystallization process. The development of the three generations of conjugated polymers in controlling the crystalline structure and enhancing polymer ordering is also discussed. This review highlights advanced characterization techniques such as X-ray diffraction, atomic force microscopy, and thermal analysis, which provide insights into molecular ordering and polymer-crystal interfaces. This review provides an insight of the structure-property relationship, glass transition, and crystallization behaviors of conjugated polymers. It serves as a foundation for further research and development of conjugated polymer-based materials with enhanced properties and performance.
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Affiliation(s)
- Tengfei Qu
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Chemical Engineering, Yili Normal University, Yining 835000, China
| | - Guangming Nan
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Chemical Engineering, Yili Normal University, Yining 835000, China
| | - Yan Ouyang
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Chemical Engineering, Yili Normal University, Yining 835000, China
| | - Bahaerguli. Bieketuerxun
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Chemical Engineering, Yili Normal University, Yining 835000, China
| | - Xiuling Yan
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Chemical Engineering, Yili Normal University, Yining 835000, China
| | - Yunpeng Qi
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Chemical Engineering, Yili Normal University, Yining 835000, China
| | - Yi Zhang
- Anhui Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes, School of Chemistry and Chemical Engineering, Suzhou University, Suzhou 234000, China
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Zhang H, Jia H, Feng W, Ni Z, Xu P, Li X. Ultra-Responsive MEMS Sensing Chip for Differential Thermal Analysis (DTA). SENSORS (BASEL, SWITZERLAND) 2023; 23:1362. [PMID: 36772402 PMCID: PMC9920126 DOI: 10.3390/s23031362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 01/21/2023] [Accepted: 01/22/2023] [Indexed: 06/18/2023]
Abstract
Ultra-responsive single-crystal silicon MEMS thermopiles for differential thermal analysis (DTA) are developed. Facilitated by a unique "microholes interetch and sealing (MIS)" technique, pairs of suspended thermopiles are batch fabricated in a differential form, with high-density (54 pairs) n-type/p-type single-crystal silicon thermocouples integrated within each thermopile (sample area ~0.045 mm2). The fabricated MEMS thermopile sensors exhibit outstanding power responsivity of 99.5 V/W and temperature responsivity of 27.8 mV/°C, which are more than 4 times higher than those reported for material thermal analysis. The high-responsivity MEMS DTA chips allow us to accurately measure the indium melting point at different heating rates of ~1-100 °C/s. We also perform DTA measurement of the dehydration process of CuSO4·5H2O and the crystals show three stages of losing water of crystallization before becoming anhydrous copper sulfate salt. Our high-performance, cost-effective MEMS sensing chips hold promise for rapid and accurate DTA characterization for a wide range of applications.
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Affiliation(s)
- Haozhi Zhang
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hao Jia
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Weiwen Feng
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zao Ni
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Pengcheng Xu
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xinxin Li
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
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3
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Karonen M. Insights into Polyphenol-Lipid Interactions: Chemical Methods, Molecular Aspects and Their Effects on Membrane Structures. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11141809. [PMID: 35890443 PMCID: PMC9317924 DOI: 10.3390/plants11141809] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/01/2022] [Accepted: 07/06/2022] [Indexed: 05/12/2023]
Abstract
Plant polyphenols have many potential applications, for example, in the fields of chemical ecology and human and animal health and nutrition. These biological benefits are related to their bioavailability, bioaccessibility and interactions with other biomolecules, such as proteins, lipids, fibers and amino acids. Polyphenol-protein interactions are well-studied, but less is known about their interactions with lipids and cell membranes. However, the affinity of polyphenols for lipid bilayers partially determines their biological activity and is also important from the usability perspective. The polyphenol-lipid interactions can be studied with several chemical tools including, among others, partition coefficient measurements, calorimetric methods, spectroscopic techniques and molecular dynamics simulation. Polyphenols can variably interact with and penetrate lipid bilayers depending on the structures and concentrations of the polyphenols, the compositions of the lipids and the ambient conditions and factors. Polyphenol penetrating the lipid bilayer can perturb and cause changes in its structure and biophysical properties. The current studies have used structurally different polyphenols, diverse model lipids and various measuring techniques. This approach provides detailed information on polyphenol-lipid interactions, but there is much variability, and the results may even be contradictory, for example, in relation to the locations and orientations of the polyphenols in the lipid bilayers. Nevertheless, by using well-characterized model polyphenols and lipids systematically and combining the results obtained with several techniques within a study, it is possible to create a good overall picture of these fascinating interactions.
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Affiliation(s)
- Maarit Karonen
- Natural Chemistry Research Group, Department of Chemistry, University of Turku, 20014 Turku, Finland
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Karela A, Clarke S, Kawaley G, Routh A, Wilson D. Freezing fouling from aqueous solutions of TBAB and TME clathrate hydrates. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Bianchi L, Cavarzan F, Ciampitti L, Cremonesi M, Grilli F, Saccomandi P. Thermophysical and mechanical properties of biological tissues as a function of temperature: a systematic literature review. Int J Hyperthermia 2022; 39:297-340. [DOI: 10.1080/02656736.2022.2028908] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Leonardo Bianchi
- Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy
| | - Fabiana Cavarzan
- Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy
| | - Lucia Ciampitti
- Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy
| | - Matteo Cremonesi
- Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy
| | - Francesca Grilli
- Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy
| | - Paola Saccomandi
- Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy
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Zhao D, Yang N, Wei Y, Jin Q, Wang Y, He H, Yang Y, Han B, Zhang S, Wang D. Sequential drug release via chemical diffusion and physical barriers enabled by hollow multishelled structures. Nat Commun 2020; 11:4450. [PMID: 32895379 PMCID: PMC7477205 DOI: 10.1038/s41467-020-18177-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Accepted: 08/03/2020] [Indexed: 11/09/2022] Open
Abstract
Hollow multishelled structures (HoMSs), with relatively isolated cavities and hierarchal pores in the shells, are structurally similar to cells. Functionally inspired by the different transmission forms in living cells, we studied the mass transport process in HoMSs in detail. In the present work, after introducing the antibacterial agent methylisothiazolinone (MIT) as model molecules into HoMSs, we discover three sequential release stages, i.e., burst release, sustained release and stimulus-responsive release, in one system. The triple-shelled structure can provide a long sterility period in a bacteria-rich environment that is nearly 8 times longer than that of the pure antimicrobial agent under the same conditions. More importantly, the HoMS system provides a smart responsive release mechanism that can be triggered by environmental changes. All these advantages could be attributed to chemical diffusion- and physical barrier-driven temporally-spatially ordered drug release, providing a route for the design of intelligent nanomaterials.
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Affiliation(s)
- Decai Zhao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Beiertiao, Zhongguancun, 100190, Beijing, PR China
- University of Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, PR China
| | - Nailiang Yang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Beiertiao, Zhongguancun, 100190, Beijing, PR China
- University of Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, PR China
| | - Yan Wei
- Department of Geriatric Dentistry, NMPA Key Laboratory for Dental Materials, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Laboratory of Biomedical Materials, Peking University School and Hospital of Stomatology, Peking University, 100081, Beijing, PR China
| | - Quan Jin
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Beiertiao, Zhongguancun, 100190, Beijing, PR China
| | - Yanlei Wang
- Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Beiertiao, Zhongguancun, 100190, Beijing, PR China
| | - Hongyan He
- Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Beiertiao, Zhongguancun, 100190, Beijing, PR China
| | - Yang Yang
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Institute for Advanced Study, Tongji University, 200430, Shanghai, PR China
| | - Bing Han
- Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, and Beijing Key Laboratory of Digital Stomatology, Peking University, 22 Zhongguancun South Avenue, Haidian District, 100081, Beijing, PR China
| | - Suojiang Zhang
- Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Beiertiao, Zhongguancun, 100190, Beijing, PR China.
| | - Dan Wang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Beiertiao, Zhongguancun, 100190, Beijing, PR China.
- University of Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, PR China.
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Shaltout AA, Dabi MM, Ibrahim MM, Al-Ghamdi AS, Elnagar E. Applicability of Low-Cost Binders for the Quantitative Elemental Analysis of Urinary Stones Using EDXRF Based on Fundamental Parameter Approach. Biol Trace Elem Res 2020; 195:417-426. [PMID: 31486014 DOI: 10.1007/s12011-019-01884-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 08/26/2019] [Indexed: 10/26/2022]
Abstract
The pressed powder sample is a common method for elemental analysis using X-ray fluorescence analysis whereas suitable light hydrocarbon materials should be added to the sample as a binder. The present study demonstrates the applicability of using different commercial binders for elemental analysis of urinary stone samples. In order to confirm the obtained results, a comparison with pure chemical grade binders was presented. Different commercial and pure binders were tested for quantitative elemental analysis of urinary stones, namely, cellulose, starch, wax, and urea. Energy dispersive X-ray fluorescence (EDXRF) was used for elemental analysis. Differential thermal analysis was used to estimate the loss on ignition (LOI) in the urinary stone samples. The signal to background ratios (I/IB) of the different detected elements in the commercial and pure binders were calculated, compared, and studied at eight different photon energies starting from 2.5 up to 37 keV. Standard-less quantitative analysis method based on the fundamental parameter approach was applied for elemental analysis of selected urinary stones. The commercial and low-cost binders could be an excellent alternative binder for urinary stone analysis using energy dispersive X-ray fluorescence. The commercial binders could provide an advantage as pure chemical grade binders or even better especially at photon energy higher than 10 keV. The best commercial binder candidate was found to be the wax. The quantitative analysis results using commercial and pure chemical grade binders give good agreement results, which indicate the applicability of commercial binders for quantitative elemental analysis of urinary stones in the form of pressed powder samples.
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Affiliation(s)
- Abdallah A Shaltout
- Spectroscopy Department, Physics Division, National Research Centre, El Behooth St., 12622 Dokki, Cairo, Egypt.
- Physics Department, Faculty of science, Taif University, Taif, 21974, P.O. Box 888, Kingdom of Saudi Arabia.
| | - Maram M Dabi
- Physics Department, Faculty of science, Taif University, Taif, 21974, P.O. Box 888, Kingdom of Saudi Arabia
| | - Mohamed M Ibrahim
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt
- Chemistry Department, Faculty of science, Taif University, Taif, 21974, P.O. Box 888, Kingdom of Saudi Arabia
| | - Ahmed S Al-Ghamdi
- Urology Department, King Abdulaziz Specialist Hospital, Taif, Kingdom of Saudi Arabia
| | - Essam Elnagar
- Urology Department, King Abdulaziz Specialist Hospital, Taif, Kingdom of Saudi Arabia
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8
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Kandhasamy S, Støre A, Haarberg GM, Kjelstrup S, Solheim A. Thermal Conductivity of Molten Carbonates with Dispersed Solid Oxide from Differential Scanning Calorimetry. MATERIALS 2019; 12:ma12091486. [PMID: 31071911 PMCID: PMC6539058 DOI: 10.3390/ma12091486] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/13/2019] [Accepted: 05/07/2019] [Indexed: 11/18/2022]
Abstract
Recently, there has been a noticeable increase in the applications of composite mixtures containing molten salt and solid oxide for thermal energy conversion and storage systems. This highlights that thermal conductivity of the composites are central for the purpose of designing and devising processes. Measuring the thermal conductivity of molten samples at elevated temperatures remains challenging. In this study, the possibility to use heat flux differential scanning calorimetry (DSC) to measure the thermal conductivity of molten samples at elevated temperatures is reported for the first time. The thermal conductivity of composite mixtures containing eutectic (Li,Na)2CO3 with and without selected solid oxides at ~675 °C was determined by using the proposed DSC approach. This mixture is a candidate for high temperature waste heat conversion to electric energy. In the DSC measurement program, steps with repeated thermal cycles between 410 and 515 °C were included to limit the effect of the interface thermal contact resistance. The determined values 0.826 ± 0.001, and 0.077 ± 0.004 W m−1K−1 for the carbonate mixtures with and without solid MgO were found to match the reliable analysis at similar conditions.
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Affiliation(s)
- Sathiyaraj Kandhasamy
- Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), NO-7034 Trondheim, Norway.
| | - Anne Støre
- SINTEF Industry, SINTEF, NO-7034 Trondheim, Norway.
| | - Geir Martin Haarberg
- Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), NO-7034 Trondheim, Norway.
| | - Signe Kjelstrup
- PoreLab, Department of Chemistry, NTNU, NO-7034 Trondheim, Norway.
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9
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Garavand F, Rouhi M, Razavi SH, Cacciotti I, Mohammadi R. Improving the integrity of natural biopolymer films used in food packaging by crosslinking approach: A review. Int J Biol Macromol 2017; 104:687-707. [PMID: 28652152 DOI: 10.1016/j.ijbiomac.2017.06.093] [Citation(s) in RCA: 245] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 06/17/2017] [Accepted: 06/21/2017] [Indexed: 11/19/2022]
Abstract
Currently used approaches for biopolymer modification are either expensive, poisonous or do not lead into the well-desired characteristics to the final film materials. Development of crosslinking procedure is an innovative strategy to improve mechanical, physical and thermal properties of biopolymer films. This review provides a brief description of film-forming biopolymers (e.g. chitosan, whey protein, alginate and starch) followed by a detailed introduction to definition and classification of various crosslinkers, the effect of crosslinking on emerging attributes of biopolymer films including physical, mechanical and thermal properties, identification of crosslinking occurrence, and cytotoxicity status of commonly used crosslinkers in the field of food and food-related packaging materials.
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Affiliation(s)
- Farhad Garavand
- Bioprocess Engineering Laboratory (BPEL), Department of Food Science and Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran
| | - Milad Rouhi
- Department of Food Science and Technology, School of Nutrition Sciences and Food Technology, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Seyed Hadi Razavi
- Bioprocess Engineering Laboratory (BPEL), Department of Food Science and Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran.
| | - Ilaria Cacciotti
- Department of Engineering, University of Rome "Niccolo Cusano", INSTM RU, Via Don Carlo Gnocchi, 3, 00166 Rome, Italy
| | - Reza Mohammadi
- Department of Food Science and Technology, School of Nutrition Sciences and Food Technology, Kermanshah University of Medical Sciences, Kermanshah, Iran
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Khan MIH, Karim MA. Cellular water distribution, transport, and its investigation methods for plant-based food material. Food Res Int 2017; 99:1-14. [PMID: 28784465 DOI: 10.1016/j.foodres.2017.06.037] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 06/12/2017] [Accepted: 06/17/2017] [Indexed: 01/19/2023]
Abstract
Heterogeneous and hygroscopic characteristics of plant-based food material make it complex in structure, and therefore water distribution in its different cellular environments is very complex. There are three different cellular environments, namely the intercellular environment, the intracellular environment, and the cell wall environment inside the food structure. According to the bonding strength, intracellular water is defined as loosely bound water, cell wall water is categorized as strongly bound water, and intercellular water is known as free water (FW). During food drying, optimization of the heat and mass transfer process is crucial for the energy efficiency of the process and the quality of the product. For optimizing heat and mass transfer during food processing, understanding these three types of waters (strongly bound, loosely bound, and free water) in plant-based food material is essential. However, there are few studies that investigate cellular level water distribution and transport. As there is no direct method for determining the cellular level water distributions, various indirect methods have been applied to investigate the cellular level water distribution, and there is, as yet, no consensus on the appropriate method for measuring cellular level water in plant-based food material. Therefore, the main aim of this paper is to present a comprehensive review on the available methods to investigate the cellular level water, the characteristics of water at different cellular levels and its transport mechanism during drying. The effect of bound water transport on quality of food product is also discussed. This review article presents a comparative study of different methods that can be applied to investigate cellular water such as nuclear magnetic resonance (NMR), bioelectric impedance analysis (BIA), differential scanning calorimetry (DSC), and dilatometry. The article closes with a discussion of current challenges to investigating cellular water.
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Affiliation(s)
- Md Imran H Khan
- Science and Engineering Faculty, Queensland University of Technology (QUT), 2 George St, Brisbane, QLD 4000, Australia; Department of Mechanical Engineering, Dhaka University of Engineering & Technology, Gazipur 1700, Bangladesh
| | - M A Karim
- Science and Engineering Faculty, Queensland University of Technology (QUT), 2 George St, Brisbane, QLD 4000, Australia.
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Antibacterial activity of agricultural waste derived wollastonite doped with copper for bone tissue engineering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 71:1156-1165. [PMID: 27987672 DOI: 10.1016/j.msec.2016.11.118] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 09/29/2016] [Accepted: 11/26/2016] [Indexed: 12/21/2022]
Abstract
Bioactive ceramic materials with metal ions generation brought great attention in the class of biomaterials development and widely employed as a filler material for bone tissue regeneration. The present study aimed to fabricate calcium silicate based ceramic material doped with copper metal particles by sol-gel method. Rice straw of agricultural waste was utilized as a source material to synthesize wollastonite, then wollastonite was doped with copper to fabricate copper doped wollastonite (Cu-Ws) particles. The synthesized materials were subjected to physio-chemical characterization by TEM, DLS, FTIR, XRD and DSC analysis. It was found that the sizes of the WS particles was around 900nm, while adding copper the size was increased upto 1184nm and the addition of copper to the material sharpening the peak. The release of Cu ions was estimated by ICP analysis. The anti-bacterial potentiality of the particles suggested that better microbial growth inhibition against E. coli (Gram negative) and S. aureus (Gram positive) strains from ATCC, in which the growth inhibition was more significant against S. aureus. The biocompatibility in mouse Mesenchymal Stem cells (mMSC) showed the non-toxic effect up to 0.05mg/ml concentration while the increase in concentration was found to be toxic to the cells. So the particles may have better potential application with the challenging prevention of post implantation infection in the field of bone tissue engineering (BTE).
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Performance Parameters and Characterizations of Nanocrystals: A Brief Review. Pharmaceutics 2016; 8:pharmaceutics8030026. [PMID: 27589788 PMCID: PMC5039445 DOI: 10.3390/pharmaceutics8030026] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/22/2016] [Accepted: 08/22/2016] [Indexed: 11/17/2022] Open
Abstract
Poor bioavailability of drugs associated with their poor solubility limits the clinical effectiveness of almost 40% of the newly discovered drug moieties. Low solubility, coupled with a high log p value, high melting point and high dose necessitates exploration of alternative formulation strategies for such drugs. One such novel approach is formulation of the drugs as “Nanocrystals”. Nanocrystals are primarily comprised of drug and surfactants/stabilizers and are manufactured by “top-down” or “bottom-up” methods. Nanocrystals aid the clinical efficacy of drugs by various means such as enhancement of bioavailability, lowering of dose requirement, and facilitating sustained release of the drug. This effect is dependent on the various characteristics of nanocrystals (particle size, saturation solubility, dissolution velocity), which have an impact on the improved performance of the nanocrystals. Various sophisticated techniques have been developed to evaluate these characteristics. This article describes in detail the various characterization techniques along with a brief review of the significance of the various parameters on the performance of nanocrystals.
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Ameta R, Singh M, Kale R. Synthesis, characterization, EDX, thermal, antioxidant, antibacterial, topographical, and gas adsorption studies of supramolecular tetraammoniumplatinate. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.763230] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- R.K. Ameta
- a School of Chemical Sciences, Central University of Gujarat , Gandhinagar , India
| | - Man Singh
- a School of Chemical Sciences, Central University of Gujarat , Gandhinagar , India
| | - R.K. Kale
- a School of Chemical Sciences, Central University of Gujarat , Gandhinagar , India
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