1
|
Nguyen KG, Huš M, Baragau IA, Bowen J, Heil T, Nicolaev A, Abramiuc LE, Sapelkin A, Sajjad MT, Kellici S. Engineering Nitrogen-Doped Carbon Quantum Dots: Tailoring Optical and Chemical Properties through Selection of Nitrogen Precursors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2310587. [PMID: 38546418 DOI: 10.1002/smll.202310587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 02/04/2024] [Indexed: 06/13/2024]
Abstract
The process of N-doping is frequently employed to enhance the properties of carbon quantum dots. However, the precise requirements for nitrogen precursors in producing high-quality N-doped carbon quantum dots (NCQDs) remain undefined. This research systematically examines the influence of various nitrogen dopants on the morphology, optical features, and band structure of NCQDs. The dots are synthesized using an efficient, eco- friendly, and rapid continuous hydrothermal flow technique. This method offers unparalleled control over synthesis and doping, while also eliminating convention-related issues. Citric acid is used as the carbon source, and urea, trizma base, beta-alanine, L-arginine, and EDTA are used as nitrogen sources. Notably, urea and trizma produced NCQDs with excitation-independent fluorescence, high quantum yields (up to 40%), and uniform dots with narrow particle size distributions. Density functional theory (DFT) and time-dependent DFT modelling established that defects and substituents within the graphitic structure have a more significant impact on the NCQDs' electronic structure than nitrogen-containing functional groups. Importantly, for the first time, this work demonstrates that the conventional approach of modelling single-layer structures is insufficient, but two layers suffice for replicating experimental data. This study, therefore, provides essential guidance on the selection of nitrogen precursors for NCQD customization for diverse applications.
Collapse
Affiliation(s)
- Kiem G Nguyen
- School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK
| | - Matej Huš
- Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Ljubljana, SI-1001, Slovenia
- Association for Technical Culture of Slovenia (ZOTKS), Zaloška 65, Ljubljana, 1000, Slovenia
- Institute for the Protection of Cultural Heritage of Slovenia (ZVKDS), Poljanska 40, Ljubljana, 1000, Slovenia
| | - Ioan-Alexandru Baragau
- School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK
- National Institute of Materials Physics, Atomistilor 405A, Magurele, Ilfov, 077125, Romania
| | - James Bowen
- School of Engineering and Innovation, Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - Tobias Heil
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany
| | - Adela Nicolaev
- National Institute of Materials Physics, Atomistilor 405A, Magurele, Ilfov, 077125, Romania
| | - Laura Elena Abramiuc
- National Institute of Materials Physics, Atomistilor 405A, Magurele, Ilfov, 077125, Romania
| | - Andrei Sapelkin
- School of Physical and Chemical Sciences, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
| | - Muhammad Tariq Sajjad
- School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK
| | - Suela Kellici
- School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK
| |
Collapse
|
2
|
Hashimoto K, Niina T, Kobayashi T, Adachi S, Watanabe Y. Isomerization and epimerization of fructose in phosphate buffer under subcritical water conditions. Carbohydr Res 2024; 535:109003. [PMID: 38056027 DOI: 10.1016/j.carres.2023.109003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 11/10/2023] [Accepted: 11/29/2023] [Indexed: 12/08/2023]
Abstract
Isomerization and epimerization of fructose to glucose, mannose, allulose, and allose were executed using a subcritical phosphate buffer solution to effectively produce useful monosaccharides. The conversion of the substrate and the yield of products were dependent on the reaction temperature, initial pH, initial substrate concentration, and buffer concentration. A high yield of mannose was achieved under the optimal reaction conditions we identified. We subsequently performed the kinetic analysis based on the proposed reaction network, and evaluated the effects of temperature and pH on the reactions. We then estimated the apparent activation energy values for each reaction.
Collapse
Affiliation(s)
- Kenta Hashimoto
- Department of Applied Biological Chemistry, Graduate School of Agriculture, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Tsugumi Niina
- Department Applied Life Science, Graduate School of Life and Environmental Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Takashi Kobayashi
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Shuji Adachi
- Department of Agriculture and Food Technology, Faculty of Bioenvironmental Sciences, Kyoto University of Advanced Science, Kameoka, Kyoto, 621-8555, Japan
| | - Yoshiyuki Watanabe
- Department of Applied Biological Chemistry, Graduate School of Agriculture, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
| |
Collapse
|
3
|
Radulescu DM, Surdu VA, Ficai A, Ficai D, Grumezescu AM, Andronescu E. Green Synthesis of Metal and Metal Oxide Nanoparticles: A Review of the Principles and Biomedical Applications. Int J Mol Sci 2023; 24:15397. [PMID: 37895077 PMCID: PMC10607471 DOI: 10.3390/ijms242015397] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/04/2023] [Accepted: 10/17/2023] [Indexed: 10/29/2023] Open
Abstract
In recent years, interest in nanotechnology has increased exponentially due to enhanced progress and technological innovation. In tissue engineering, the development of metallic nanoparticles has been amplified, especially due to their antibacterial properties. Another important characteristic of metal NPs is that they enable high control over the features of the developed scaffolds (optimizing their mechanical strength and offering the controlled release of bioactive agents). Currently, the main concern related to the method of synthesis of metal oxide NPs is the environmental impact. The physical and chemical synthesis uses toxic agents that could generate hazards or exert carcinogenicity/environmental toxicity. Therefore, a greener, cleaner, and more reliable approach is needed. Green synthetic has come as a solution to counter the aforementioned limitations. Nowadays, green synthesis is preferred because it leads to the prevention/minimization of waste, the reduction of derivatives/pollution, and the use of non-toxic (safer) solvents. This method not only uses biomass sources as reducing agents for metal salts. The biomolecules also cover the synthesized NPs or act as in situ capping and reducing agents. Further, their involvement in the formation process reduces toxicity, prevents nanoparticle agglomeration, and improves the antimicrobial activity of the nanomaterial, leading to a possible synergistic effect. This study aims to provide a comprehensive review of the green synthesis of metal and metal oxide nanoparticles, from the synthesis routes, selected solvents, and parameters to their latest application in the biomedical field.
Collapse
Affiliation(s)
- Denisa-Maria Radulescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, Bucharest National Polytechnic University of Science and Technology, 011061 Bucharest, Romania; (D.-M.R.); (V.-A.S.); (A.F.); (D.F.); (A.-M.G.)
| | - Vasile-Adrian Surdu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, Bucharest National Polytechnic University of Science and Technology, 011061 Bucharest, Romania; (D.-M.R.); (V.-A.S.); (A.F.); (D.F.); (A.-M.G.)
| | - Anton Ficai
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, Bucharest National Polytechnic University of Science and Technology, 011061 Bucharest, Romania; (D.-M.R.); (V.-A.S.); (A.F.); (D.F.); (A.-M.G.)
- Academy of Romanian Scientists, Ilfov 3, 050044 Bucharest, Romania
| | - Denisa Ficai
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, Bucharest National Polytechnic University of Science and Technology, 011061 Bucharest, Romania; (D.-M.R.); (V.-A.S.); (A.F.); (D.F.); (A.-M.G.)
| | - Alexandru-Mihai Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, Bucharest National Polytechnic University of Science and Technology, 011061 Bucharest, Romania; (D.-M.R.); (V.-A.S.); (A.F.); (D.F.); (A.-M.G.)
- Academy of Romanian Scientists, Ilfov 3, 050044 Bucharest, Romania
- Research Institute of the University of Bucharest—ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Ecaterina Andronescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, Bucharest National Polytechnic University of Science and Technology, 011061 Bucharest, Romania; (D.-M.R.); (V.-A.S.); (A.F.); (D.F.); (A.-M.G.)
| |
Collapse
|
4
|
Zhang ZH, Cheng WL, Li XD, Wang X, Yang FW, Xiao JS, Li YX, Zhao GP. Extraction, bioactive function and application of wheat germ protein/peptides: A review. Curr Res Food Sci 2023; 6:100512. [PMID: 37215742 PMCID: PMC10196331 DOI: 10.1016/j.crfs.2023.100512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 04/10/2023] [Accepted: 04/30/2023] [Indexed: 05/24/2023] Open
Abstract
The aging population and high incidence of age-related diseases are major global societal issues. Consuming bioactive substances as part of our diet is increasingly recognized as essential for ensuring a healthy life for older adults. Wheat germ protein has a reasonable peptide structure and amino acid ratio but has not been fully utilized and exploited, resulting in wasted wheat germ resources. This review summarizes reformational extraction methods of wheat germ protein/peptides (WGPs), of which different methods can be selected to obtain various WGPs. Interestingly, except for some bioactive activities found earlier, WGPs display potential anti-aging activity, with possible mechanisms including antioxidant, immunomodulatory and intestinal flora regulation. However, there are missing in vitro and in vivo bioactivity assessments of WGPs. WGPs possess physicochemical properties of good foamability, emulsification and water retention and are used as raw materials or additives to improve food quality. Based on the above, further studies designing methods to isolate particular types of WGPs, determining their nutritional and bioactive mechanisms and verifying their activity in vivo in humans are crucial for using WGPs to improve human health.
Collapse
Affiliation(s)
- Zhi-hui Zhang
- School of Food and Health, Beijing Technology and Business University, Beijing, 100048, China
| | - Wei-long Cheng
- School of Food and Health, Beijing Technology and Business University, Beijing, 100048, China
- National Center of Technology Innovation for Dairy, Inner Mongolia, 013757, China
| | - Xiu-de Li
- School of Food and Health, Beijing Technology and Business University, Beijing, 100048, China
| | - Xin Wang
- Food Quality and Safety, Agricultural University of Hebei Bohai Campus, Cangzhou, 071001, China
| | - Fang-wei Yang
- School of Food and Health, Beijing Technology and Business University, Beijing, 100048, China
| | - Jun-song Xiao
- School of Food and Health, Beijing Technology and Business University, Beijing, 100048, China
| | - Yi-xuan Li
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing, 100083, China
| | - Guo-ping Zhao
- School of Food and Health, Beijing Technology and Business University, Beijing, 100048, China
- National Center of Technology Innovation for Dairy, Inner Mongolia, 013757, China
| |
Collapse
|
5
|
Vo H, Saldaña MD. Hydrolysis of pea protein concentrate in subcritical water media with addition of citrus pectin and citric acid. J Supercrit Fluids 2023. [DOI: 10.1016/j.supflu.2023.105866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
|
6
|
Optimization and Potentials of Kraft Lignin Hydrolysates Obtained by Subcritical Water at Moderate Temperatures. Processes (Basel) 2022. [DOI: 10.3390/pr10102049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Kraft lignin was treated with subcritical water at moderate temperatures (120–220 °C) in different gas atmospheres, with the goal of optimizing its depolymerization under mild conditions. Lignin depolymerization was observed and compared using different homogeneous and heterogeneous catalysts in both nitrogen and carbon dioxide atmospheres. The most important treatment parameters for maximum lignin depolymerization and the highest yields of phenolic and other aromatic monomers were optimized. The influence of the process temperature, pressure, and time in both gas atmospheres was defined and optimized for maximum liberation of monomers into the aqueous phase. The yields of total phenols and other aromatics in the nitrogen atmosphere were the highest at 150 °C, whereas treatment in the carbon dioxide atmosphere required higher temperatures (200 °C) for a comparable efficiency. The effects of phenol addition as a capping agent in lignin depolymerization were observed and defined for both gas atmospheres. Phenol addition caused a remarkable increase in the total phenols content in the aqueous phase; however, it did not significantly affect the contents of other aromatics. The antioxidant properties of lignin hydrolysates obtained at different temperatures in different gas atmospheres were compared, correlated with the total phenols contents, and discussed, showing the promising potential of lignin hydrolysates obtained under mild subcritical water conditions.
Collapse
|
7
|
Dasaradhan C, Nawaz Khan FR. Synthesis of 2, 4-Disubstituted Quinazolines via One-Pot Three-Component Assembly. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2021.1876112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Changalaraya Dasaradhan
- Organic and Medicinal Chemistry Research Laboratory, Organic Chemistry Division, School of Advanced Sciences, VIT University, Vellore, India
| | - Fazlur-Rahman Nawaz Khan
- Organic and Medicinal Chemistry Research Laboratory, Organic Chemistry Division, School of Advanced Sciences, VIT University, Vellore, India
| |
Collapse
|
8
|
Protein Hydrolysis by Subcritical Water: A New Perspective on Obtaining Bioactive Peptides. Molecules 2021; 26:molecules26216655. [PMID: 34771063 PMCID: PMC8587823 DOI: 10.3390/molecules26216655] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 10/27/2021] [Accepted: 10/29/2021] [Indexed: 11/17/2022] Open
Abstract
The importance of bioactive peptides lies in their diverse applications in the pharmaceutical and food industries. In addition, they have been projected as allies in the control and prevention of certain diseases due to their associated antioxidant, antihypertensive, or hypoglycemic activities, just to mention a few. Obtaining these peptides has been performed traditionally by fermentation processes or enzymatic hydrolysis. In recent years, the use of supercritical fluid technology, specifically subcritical water (SW), has been positioned as an efficient and sustainable alternative to obtain peptides from various protein sources. This review presents and discusses updated research reports on the use of subcritical water to obtain bioactive peptides, its hydrolysis mechanism, and the experimental designs used for the study of effects from factors involved in the hydrolysis process. The aim was to promote obtaining peptides by green technology and to clarify perspectives that still need to be explored in the use of subcritical water in protein hydrolysis.
Collapse
|
9
|
Howie RA, Elliott LD, Kayal S, Sun XZ, Hanson-Heine MWD, Hunter J, Clark CA, Love A, Wiseall C, Lee DS, Poliakoff M, Booker Milburn KI, George MW. Integrated Multistep Photochemical and Thermal Continuous Flow Reactions: Production of Bicyclic Lactones with Kilogram Productivity. Org Process Res Dev 2021. [DOI: 10.1021/acs.oprd.1c00089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rowena A. Howie
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Luke D. Elliott
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Surajit Kayal
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Xue-Zhong Sun
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | | | - Jonathan Hunter
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Charlotte A. Clark
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Ashley Love
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Christopher Wiseall
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Darren S. Lee
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Martyn Poliakoff
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | | | - Michael W. George
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| |
Collapse
|
10
|
A Review of Hydrothermal Liquefaction of Biomass for Biofuels Production with a Special Focus on the Effect of Process Parameters, Co-Solvents, and Extraction Solvents. ENERGIES 2021. [DOI: 10.3390/en14164916] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Hydrothermal liquefaction is one of the common thermochemical conversion methods adapted to convert high-water content biomass feedstocks to biofuels and many other valuable industrial chemicals. The hydrothermal process is broadly classified into carbonization, liquefaction, and gasification with hydrothermal liquefaction conducted in the intermediate temperature range of 250–374 °C and pressure of 4–25 MPa. Due to the ease of adaptability, there has been considerable research into the process on using various types of biomass feedstocks. Over the years, various solvents and co-solvents have been used as mediums of conversion, to promote easy decomposition of the lignocellulosic components in biomass. The product separation process, to obtain the final products, typically involves multiple extraction and evaporation steps, which greatly depend on the type of extractive solvents and process parameters. In general, the main aim of the hydrothermal process is to produce a primary product, such as bio-oil, biochar, gases, or industrial chemicals, such as adhesives, benzene, toluene, and xylene. All of the secondary products become part of the side streams. The optimum process parameters are obtained to improve the yield and quality of the primary products. A great deal of the process depends on understanding the underlined reaction chemistry during the process. Therefore, this article reviews the major works conducted in the field of hydrothermal liquefaction in order to understand the mechanism of lignocellulosic conversion, describing the concept of a batch and a continuous process with the most recent state-of-art technologies in the field. Further, the article provides detailed insight into the effects of various process parameters, co-solvents, and extraction solvents, and their effects on the products’ yield and quality. It also provides information about possible applications of products obtained through liquefaction. Lastly, it addresses gaps in research and provides suggestions for future studies.
Collapse
|
11
|
Synthesis of activated carbon from salacca peel with hydrothermal carbonization for supercapacitor application. ACTA ACUST UNITED AC 2021. [DOI: 10.1016/j.matpr.2020.11.515] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
12
|
Sanchez-Hernandez AM, Martin-Sanchez N, Sanchez-Montero MJ, Izquierdo C, Salvador F. Different options to upgrade engine oils by gasification with steam and supercritical water. J Supercrit Fluids 2020. [DOI: 10.1016/j.supflu.2020.104912] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
13
|
Bae SM, Lee SC. Effect of subcritical water extraction conditions on the activity of alcohol metabolizing enzymes, ACE inhibition, and tyrosinase inhibition in Protaetia brevitarsis larvae. Food Sci Biotechnol 2020; 29:867-872. [PMID: 32523796 DOI: 10.1007/s10068-019-00728-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 12/01/2019] [Accepted: 12/15/2019] [Indexed: 11/28/2022] Open
Abstract
In order to develop processing methods with high physiological activity for Protaetia brevitarsis larvae (PBL), subcritical water (SCW) extraction was applied. The dried powder (1 g) of PBL was extracted with 10 mL distilled water at 100, 200, and 300 °C for 30 min. The SCW treatment significantly (p < 0.05) increased some physiological activities of the PBL extracts. The SCW extract at 300 °C increased alcohol dehydrogenase, acetaldehyde dehydrogenase, and tyrosinase inhibitory activities from 192.3 ± 4.1% to 452.2 ± 0.5%, 125.4 ± 2.9% to 153.3 ± 0.4%, and - 7.0 ± 0.7% to 26.1 ± 1.4%, respectively, compared to the extract at 100 °C. Contrarily, the inhibition activity of angiotensin converting enzyme was the highest at 200 °C. These results suggest that SCW is a suitable method to extract and maintain the physiological activity of PBL.
Collapse
Affiliation(s)
- Sung-Mun Bae
- Environmental Agriculture Research Division, Gyeongsangnam-do Agricultural Research and Extension Services, Namgang-ro 1851, Jinju, 52638 Republic of Korea
| | - Seung-Cheol Lee
- Department of Food Development, School of Bioconvergence, College of Health Sciences, Kyungnam University, Kyungnamdaehak-ro 7, Changwon, 51767 Republic of Korea
| |
Collapse
|
14
|
Nastić N, Borrás-Linares I, Lozano-Sánchez J, Švarc-Gajić J, Segura-Carretero A. Comparative Assessment of Phytochemical Profiles of Comfrey ( Symphytum officinale L.) Root Extracts Obtained by Different Extraction Techniques. Molecules 2020; 25:E837. [PMID: 32075048 PMCID: PMC7070662 DOI: 10.3390/molecules25040837] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 02/10/2020] [Accepted: 02/12/2020] [Indexed: 11/30/2022] Open
Abstract
In this work a comparative study on phytochemical profiles of comfrey root extracts obtained by different extraction approaches has been carried out. Chemical profiles of extracts obtained by supercritical fluid (SFE), pressurized liquid (PLE), and conventional solid/liquid extraction were compared and discussed. Phytochemical composition was assessed by high-performance liquid chromatography coupled with electrospray time-of-flight mass spectrometry (HPLC-ESI-QTOF-MS/MS) identifying 39 compounds reported for the first time in comfrey root, mainly phenolic acids and fatty acids. The influence of different extraction parameters on phytochemical profiles of S. officinale root was investigated for all applied techniques. PLE and maceration, using alcohol-based solvents (aqueous methanol or ethanol), were shown to be more efficient in the recovery of more polar compounds. Greater numbers of phenolics were best extracted by PLE using 85% EtOH at 63 °C. The use of SFE and 100% acetone for 30 min enabled good recoveries of nonpolar compounds. SFE using 15% EtOH as a cosolvent at 150 bar produced the best recoveries of a significant number of fatty acids. The main compositional differences between extracts obtained by different extraction techniques were assigned to the solvent type. Hence, these results provided comprehensive approaches for treating comfrey root enriched in different phytochemicals, thereby enhancing its bioaccessibility.
Collapse
Affiliation(s)
- Nataša Nastić
- Faculty of Technology, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia; (N.N.)
| | - Isabel Borrás-Linares
- Functional Food Research and Development Centre (CIDAF), Health Science Technological Park, Avda. del Conocimiento s/n, Bioregion building, 18016 Granada, Spain; (I.B.-L.); (A.S.-C.)
| | - Jesús Lozano-Sánchez
- Functional Food Research and Development Centre (CIDAF), Health Science Technological Park, Avda. del Conocimiento s/n, Bioregion building, 18016 Granada, Spain; (I.B.-L.); (A.S.-C.)
- Department of Food Science and Nutrition, University of Granada, Campus Universitario s/n, 18071 Granada, Spain
| | - Jaroslava Švarc-Gajić
- Faculty of Technology, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia; (N.N.)
| | - Antonio Segura-Carretero
- Functional Food Research and Development Centre (CIDAF), Health Science Technological Park, Avda. del Conocimiento s/n, Bioregion building, 18016 Granada, Spain; (I.B.-L.); (A.S.-C.)
- Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071 Granada, Spain
| |
Collapse
|
15
|
Evci E, Yılmaz Ö, Bekfelavi EY, Şimşek Kuş N. Degradation of olive mill wastewater by different methods and antioxidant activity of olive mill wastewater extraction. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-1210-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
|
16
|
He C, Du H, Tan C, Chen Z, Chen Z, Yin F, Xu Y, Liu X. Semi-continuous pressurized hot water extraction of black tea. J FOOD ENG 2018. [DOI: 10.1016/j.jfoodeng.2018.02.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
17
|
Gagić T, Perva-Uzunalić A, Knez Ž, Škerget M. Hydrothermal Degradation of Cellulose at Temperature from 200 to 300 °C. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b00332] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tanja Gagić
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Amra Perva-Uzunalić
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Željko Knez
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
- Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Mojca Škerget
- Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| |
Collapse
|
18
|
Affiliation(s)
- Makoto Akizuki
- Department of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan
| | - Yoshito Oshima
- Department of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan
| |
Collapse
|
19
|
Alcázar-Alay SC, Osorio-Tobón JF, Forster-Carneiro T, Steel CJ, Meireles MAA. Polymer modification from semi-defatted annatto seeds using hot pressurized water and supercritical CO 2. J Supercrit Fluids 2017. [DOI: 10.1016/j.supflu.2016.12.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
20
|
Rapid formation of chemical complexity via a modified Biginelli reaction leading to dihydrofuran-2(3 H )-one spiro-derivatives of triazolo[1,5- a ]pyrimidine. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.07.071] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
21
|
Hydrogen-Deuterium chemical exchange in supercritical water: Thermodynamic considerations for optimizing the synthesis of high degree deuterated benzene. J Supercrit Fluids 2017. [DOI: 10.1016/j.supflu.2017.02.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
22
|
Effect of water properties on selectivity for 1-octene and 2-octanol reaction systems in sub- and supercritical water using a TiO2 catalyst. J Supercrit Fluids 2017. [DOI: 10.1016/j.supflu.2016.11.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
23
|
Švarc-Gajić J, Cvetanović A, Segura-Carretero A, Linares IB, Mašković P. Characterisation of ginger extracts obtained by subcritical water. J Supercrit Fluids 2017. [DOI: 10.1016/j.supflu.2016.12.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
24
|
Yabalak E, Döndaş HA, Gizir AM. Subcritical water oxidation of 6-aminopenicillanic acid and cloxacillin using H 2O 2, K 2S 2O 8, and O 2. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2017; 52:210-220. [PMID: 27835054 DOI: 10.1080/10934529.2016.1246935] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This study was undertaken to investigate the degradation of 6-aminopenicillanic acid (6-APA) and cloxacillin in aqueous solution by the combined effect of subcritical water and the oxidising agents O2, H2O2, and K2S2O8. Nano ZnO was used as a solid catalyst. Response surface methodology was used to determine the optimum experimental parameters (temperature, treatment time, and concentration of oxidising agent). For 6-APA, the maximum organic carbon (TOC) removal rates of 83.54%, 81.11% and 42.42% were obtained using H2O2, K2S2O8, and O2, respectively. For cloxacillin, the maximum TOC removal rates of 67.69%, 76.02% and 14.45% were obtained using H2O2, K2S2O8, and O2, respectively. Additionally, the impact of nano and commercial ZnO on TOC removal rates was determined. Secondary ions produced during the degradation process-such as nitrite, nitrate, sulphate and chloride-were determined using ion chromatography.
Collapse
Affiliation(s)
- Erdal Yabalak
- a Department of Chemistry , Faculty of Arts and Science, Mersin University , Mersin , Turkey
| | - H Ali Döndaş
- b Department of Analytical Chemistry , Faculty of Pharmacy, Mersin University , Mersin , Turkey
| | - Ahmet Murat Gizir
- a Department of Chemistry , Faculty of Arts and Science, Mersin University , Mersin , Turkey
| |
Collapse
|
25
|
Effect of supercritical water on the stability of WO X /TiO 2 and NbO X /TiO 2 catalysts during glycerol dehydration. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2016.03.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
26
|
Gong M, Zhu W, Zhang H, Su Y, Fan Y. Polycyclic aromatic hydrocarbon formation from gasification of sewage sludge in supercritical water: The concentration distribution and effect of sludge properties. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2016.03.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
27
|
Gong M, Zhu W, Fan Y, Zhang H, Su Y. Influence of the reactant carbon-hydrogen-oxygen composition on the key products of the direct gasification of dewatered sewage sludge in supercritical water. BIORESOURCE TECHNOLOGY 2016; 208:81-86. [PMID: 26922316 DOI: 10.1016/j.biortech.2016.02.070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 01/25/2016] [Accepted: 02/17/2016] [Indexed: 06/05/2023]
Abstract
The supercritical water gasification of ten different types of dewatered sewage sludges was investigated to understand the relationship between sludge properties and gasification products. Experiments were performed in a high-pressure autoclave at 400°C for 60 min. Results showed that gasification of sewage sludge in supercritical water consists mainly of a gasification reaction, a carbonization reaction and a persistent organic pollutants synthesis reaction. Changes in the reactant C/H/O composition have significant effects on the key gasification products. Total gas production increased with increasing C/H2O of the reactant. The char/coke content increased with increasing C/H ratio of the reactant. A decrease in the C/O ratio of the reactant led to a reduction in polycyclic aromatic hydrocarbon formation. This means that we can adjust the reactant C/H/O composition by adding carbon-, hydrogen-, and oxygen-containing substances such as coal, algae and H2O2 to optimize hydrogen production and to inhibit an undesired by-product formation.
Collapse
Affiliation(s)
- Miao Gong
- College of Environment, Hohai University, Nanjing 210098, PR China; Department of Earth and Space Science and Engineering, York University, Toronto, Ontario M3J 1P3, Canada
| | - Wei Zhu
- College of Environment, Hohai University, Nanjing 210098, PR China; National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 210098, PR China.
| | - Yujie Fan
- College of Environment, Hohai University, Nanjing 210098, PR China
| | - Huiwen Zhang
- College of Environment, Hohai University, Nanjing 210098, PR China; National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 210098, PR China
| | - Ying Su
- College of Environment, Hohai University, Nanjing 210098, PR China
| |
Collapse
|
28
|
Alonso DA, Baeza A, Chinchilla R, Guillena G, Pastor IM, Ramón DJ. Deep Eutectic Solvents: The Organic Reaction Medium of the Century. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501197] [Citation(s) in RCA: 421] [Impact Index Per Article: 52.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
29
|
Optimization of hydrolysis of rutin in subcritical water using response surface methodology. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2015.05.028] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
30
|
Christmann M, Hu J, Kitamura M, Stoltz B. Tetrahedron reports on organic chemistry. Tetrahedron 2015. [DOI: 10.1016/s0040-4020(15)00744-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
31
|
Gao DM, Kobayashi T, Adachi S. Promotion or suppression of glucose isomerization in subcritical aqueous straight- and branched-chain alcohols. Biosci Biotechnol Biochem 2015; 79:470-4. [DOI: 10.1080/09168451.2014.973366] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Abstract
The influence of water-miscible alcohols (methanol, 1-propanol, 2-propanol, and t-butyl alcohol) on the isomerization of glucose to fructose and mannose was investigated under subcritical aqueous conditions (180–200 °C). Primary and secondary alcohols promoted the conversion and isomerization of glucose to afford fructose and mannose with high and low selectivity, respectively. On the other hand, the decomposition (side-reaction) of glucose was suppressed in the presence of the primary and secondary alcohols compared with that in subcritical water. The yield of fructose increased with increasing concentration of the primary and secondary alcohols, and the species of the primary and secondary alcohols tested had little effect on the isomerization behavior of glucose. In contrast, the isomerization of glucose was suppressed in subcritical aqueous t-butyl alcohol. Both the conversion of glucose and the yield of fructose decreased with increasing concentration of t-butyl alcohol. In addition, mannose was not detected in reactions using subcritical aqueous t-butyl alcohol.
Collapse
Affiliation(s)
- Da-Ming Gao
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Takashi Kobayashi
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Shuji Adachi
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| |
Collapse
|
32
|
|
33
|
Knez Ž, Markočič E, Hrnčič MK, Ravber M, Škerget M. High pressure water reforming of biomass for energy and chemicals: A short review. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2014.06.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
34
|
Poerschmann J, Weiner B, Woszidlo S, Koehler R, Kopinke FD. Hydrothermal carbonization of poly(vinyl chloride). CHEMOSPHERE 2015; 119:682-689. [PMID: 25150971 DOI: 10.1016/j.chemosphere.2014.07.058] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 06/30/2014] [Accepted: 07/05/2014] [Indexed: 05/26/2023]
Abstract
Poly(vinyl chloride) (PVC) was subjected to hydrothermal carbonization in subcritical water at 180-260 °C. Dehydrochlorination increased with increasing reaction temperature. The release of chlorine was almost quantitative above ∼235 °C. The fraction of organic carbon (OC) recovered in the hydrochar decreased with increasing operating temperature from 93% at 180 °C to 75% at 250 °C. A wide array of polycyclic aromatic hydrocarbons (PAHs) could be detected in the aqueous phase, but their combined concentration amounted to only ∼140 μg g(-1) PVC-substrate at 240 °C. A pathway for the formation of cyclic hydrocarbons and O-functionalized organics was proposed. Chlorinated hydrocarbons including chlorophenols could only be identified at trace levels (low ppb). Polychlorinated dibenzodioxins (PCDDs) and dibenzofurans (PCDFs) could not be detected. The sorption potential of the hydrochar turned out to be very low, in particular for polar organic pollutants. Our results provide strong evidence that hydrothermal carbonization of household organic wastes which can be tied to co-discarded PVC-plastic residues is environmentally sound regarding the formation of toxic organic products. Following these findings, hydrothermal treatment of PVC-waste beyond operating temperatures of ∼235 °C to allow complete release of organic chlorine should be further pursued.
Collapse
Affiliation(s)
- J Poerschmann
- UFZ-Helmholtz Center for Environmental Research, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany.
| | - B Weiner
- UFZ-Helmholtz Center for Environmental Research, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany
| | - S Woszidlo
- UFZ-Helmholtz Center for Environmental Research, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany
| | - R Koehler
- UFZ-Helmholtz Center for Environmental Research, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany
| | - F-D Kopinke
- UFZ-Helmholtz Center for Environmental Research, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany
| |
Collapse
|
35
|
Chan YH, Yusup S, Quitain AT, Uemura Y, Sasaki M. Bio-oil production from oil palm biomass via subcritical and supercritical hydrothermal liquefaction. J Supercrit Fluids 2014. [DOI: 10.1016/j.supflu.2014.10.014] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
36
|
Kida Y, Class CA, Concepcion AJ, Timko MT, Green WH. Combining experiment and theory to elucidate the role of supercritical water in sulfide decomposition. Phys Chem Chem Phys 2014; 16:9220-8. [DOI: 10.1039/c4cp00711e] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Supercritical water is observed to react with alkyl sulfides, forming H2S, CO, and alkanes. Quantum chemistry calculations show this occurs via a multistep mechanism involving both free radical and pericyclic reactions, with water acting as both a reagent and a catalyst.
Collapse
Affiliation(s)
- Yuko Kida
- Massachusetts Institute of Technology
- Department of Chemical Engineering
- Cambridge, USA
| | - Caleb A. Class
- Massachusetts Institute of Technology
- Department of Chemical Engineering
- Cambridge, USA
| | - Anthony J. Concepcion
- Massachusetts Institute of Technology
- Department of Chemical Engineering
- Cambridge, USA
| | - Michael T. Timko
- Worcester Polytechnic Institute
- Department of Chemical Engineering
- Worcester, USA
| | - William H. Green
- Massachusetts Institute of Technology
- Department of Chemical Engineering
- Cambridge, USA
| |
Collapse
|
37
|
Akizuki M, Fujii T, Hayashi R, Oshima Y. Effects of water on reactions for waste treatment, organic synthesis, and bio-refinery in sub- and supercritical water. J Biosci Bioeng 2014; 117:10-8. [DOI: 10.1016/j.jbiosc.2013.06.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 06/07/2013] [Accepted: 06/11/2013] [Indexed: 11/26/2022]
|
38
|
Akizuki M, Oshima Y. Effects of water density on acid-catalytic properties of TiO2 and WO3/TiO2 in supercritical water. J Supercrit Fluids 2013. [DOI: 10.1016/j.supflu.2013.09.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
39
|
Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2013. [DOI: 10.1016/s0040-4020(13)01252-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
40
|
Pavlovič I, Knez Ž, Škerget M. Hydrothermal reactions of agricultural and food processing wastes in sub- and supercritical water: a review of fundamentals, mechanisms, and state of research. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:8003-8025. [PMID: 23848589 DOI: 10.1021/jf401008a] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Hydrothermal (HT) reactions of agricultural and food-processing waste have been proposed as an alternative to conventional waste treatment technologies due to allowing several improvements in terms of process performance and energy and economical advantages, especially due to their great ability to process high moisture content biomass waste without prior dewatering. Complex structures of wastes and unique properties of water at higher temperatures and pressures enable a variety of physical-chemical reactions and a wide spectra of products. This paper's aim is to give extensive information about the fundamentals and mechanisms of HT reactions and provide state of the research of agri-food waste HT conversion.
Collapse
Affiliation(s)
- Irena Pavlovič
- Laboratory for Separation Processes and Product Design, Faculty for Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | | | | |
Collapse
|
41
|
Sımsek Kus N. One-step synthesis of substituted isobenzofuran-1(3H)-ones and isobenzofuran-1,3-diones from indane derivatives in subcritical media. MONATSHEFTE FUR CHEMIE 2013. [DOI: 10.1007/s00706-013-0928-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
42
|
Avola S, Guillot M, da Silva-Perez D, Pellet-Rostaing S, Kunz W, Goettmann F. Organic chemistry under hydrothermal conditions. PURE APPL CHEM 2012. [DOI: 10.1351/pac-con-12-04-01] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
At elevated temperature, several properties of water are strongly altered compared to what our daily experience tells us: the dielectric constant of water, for example, is reduced, so that water can more easily solubilize organic molecules. In addition, the self-dissociation constant of water is increased (by three orders of magnitude at 250 °C), thus favoring H+- and OH–-catalyzed reactions. Surprisingly, while room-temperature water and supercritical water (SCW) are well known for promoting organic reactions, the middle temperature range still remains largely unexplored. Therefore, this contribution aims at giving an overview of organic reactions that may be promoted by superheated water.
Collapse
Affiliation(s)
- Sabine Avola
- 1Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany
| | - Marie Guillot
- 2FCBA/Pôle Nouveaux Matériaux, Domaine Universitaire, BP 251 38044 Grenoble Cedex, France
| | | | - Stephane Pellet-Rostaing
- 3Laboratoire de Tri Ionique par les Systemes Moléculaires Auto-assemblés, Institut de Chimie Séparative de Marcoule (ICSM, UMR5257), Centre de Marcoule, 30207 Bagnols/Ceze, France
| | - Werner Kunz
- 1Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany
| | - Frédéric Goettmann
- 4Laboratoire de Chimie des Fluides Complexes et Irradiation, DEN/MAR/DTCD/SPDE/LCFI, Centre de Marcoule, 30207 Bagnols/Ceze, France
| |
Collapse
|