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Muneer F, Hedenqvist MS, Hall S, Kuktaite R. Innovative Green Way to Design Biobased Electrospun Fibers from Wheat Gluten and These Fibers’ Potential as Absorbents of Biofluids. ACS ENVIRONMENTAL AU 2022; 2:232-241. [PMID: 37102143 PMCID: PMC10125173 DOI: 10.1021/acsenvironau.1c00049] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In this study, a new method was developed to successfully design sustainable microfibers from wheat gluten proteins using a nonreducing solvent and electrospinning. We explored the morphology by X-ray tomography, scanning electron microscopy (SEM), and confocal laser scanning microscopy (CLSM), protein chemistry and cross-linking by size exclusion-high-performance liquid chromatography (SE-HPLC), and secondary structure by Fourier transform infrared spectroscopy (FT-IR) of fibers containing 15 and 20% of gluten. The impact of heat (130 °C) post-treatment on the polymerization properties of fibers and their absorption performance in different biofluids were also evaluated. The fibers with 20% gluten showed a uniform architecture supported by a relatively stronger fibrous network as compared to irregular and brittle fibers from 15% gluten. Heat treatment of fibers increased the protein cross-linking in all electrospun fibers as compared to the non-heat-treated fibers, as evidenced by SE-HPLC. An increase in the amount of α-helices and random coils was observed in the proteins of all of the heat-treated fibers compared to the nontreated fibers by FT-IR. This suggested that the heat treatment contributed positively to the gluten protein's chemical rearrangements, e.g., aggregation, new hydrogen and isopeptide bonding, and conversion of some of the sulfhydryl groups into disulfide cross-links, contributing positively to the functional performance. The heat-treated electrospun fibers with 20% gluten showed a very attractive blood absorption capacity (323%) and reasonable stability in phosphate-buffered saline (PBS) buffer compared to 15% gluten fibers and non-heat-treated fibers. Cotton-like fiber architecture, high blood absorption capacity, and reasonable stability in PBS buffer are properties desired for absorbents of biofluids and should be further explored in healthcare and medical applications.
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Affiliation(s)
- Faraz Muneer
- Department of Plant Breeding, Swedish University of Agricultural Sciences, Box 190, SE-23422 Lomma, Sweden
| | - Mikael S. Hedenqvist
- Fiber and Polymer Technology Department, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - Stephen Hall
- Solid Mechanics, Lund Institute of Advanced Neutron and X-ray Science (LINXS), Lund University, Box
117, SE-221 00 Lund, Sweden
| | - Ramune Kuktaite
- Department of Plant Breeding, Swedish University of Agricultural Sciences, Box 190, SE-23422 Lomma, Sweden
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Garcia RHDS, Filgueiras JG, Colnago LA, de Azevedo ER. Real-Time Monitoring Polymerization Reactions Using Dipolar Echoes in 1H Time Domain NMR at a Low Magnetic Field. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27020566. [PMID: 35056881 PMCID: PMC8778891 DOI: 10.3390/molecules27020566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/18/2021] [Accepted: 12/20/2021] [Indexed: 11/16/2022]
Abstract
1H time domain nuclear magnetic resonance (1H TD-NMR) at a low magnetic field becomes a powerful technique for the structure and dynamics characterization of soft organic materials. This relies mostly on the method sensitivity to the 1H-1H magnetic dipolar couplings, which depend on the molecular orientation with respect to the applied magnetic field. On the other hand, the good sensitivity of the 1H detection makes it possible to monitor real time processes that modify the dipolar coupling as a result of changes in the molecular mobility. In this regard, the so-called dipolar echoes technique can increase the sensitivity and accuracy of the real-time monitoring. In this article we evaluate the performance of commonly used 1H TD-NMR dipolar echo methods for probing polymerization reactions. As a proof of principle, we monitor the cure of a commercial epoxy resin, using techniques such as mixed-Magic Sandwich Echo (MSE), Rhim Kessemeier-Radiofrequency Optimized Solid Echo (RK-ROSE) and Dipolar Filtered Magic Sandwich Echo (DF-MSE). Applying a reaction kinetic model that supposes simultaneous autocatalytic and noncatalytic reaction pathways, we show the analysis to obtain the rate and activation energy for the epoxy curing reaction using the NMR data. The results obtained using the different NMR methods are in good agreement among them and also results reported in the literature for similar samples. This demonstrates that any of these dipolar echo pulse sequences can be efficiently used for monitoring and characterizing this type of reaction. Nonetheless, the DF-MSE method showed intrinsic advantages, such as easier data handling and processing, and seems to be the method of choice for monitoring this type of reaction. In general, the procedure is suitable for characterizing reactions involving the formation of solid products from liquid reagents, with some adaptations concerning the reaction model.
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Affiliation(s)
| | - Jefferson Gonçalves Filgueiras
- Instituto de Química, Universidade Federal Fluminense, Outeiro de São João Batista, Niterói 24020-007, RJ, Brazil;
- Instituto de Física, Universidade Federal do Rio de Janeiro, CP68528, Rio de Janeiro 21941-972, RJ, Brazil
| | - Luiz Alberto Colnago
- Embrapa Instrumentação, Rua XV de Novembro, 1452, São Carlos 13560-970, SP, Brazil;
| | - Eduardo Ribeiro de Azevedo
- Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, São Carlos 13660-970, SP, Brazil
- Correspondence:
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Facchinatto WM, Dos Santos Garcia RH, Dos Santos DM, Fiamingo A, Menezes Flores DW, Campana-Filho SP, de Azevedo ER, Colnago LA. Fast-forward approach of time-domain NMR relaxometry for solid-state chemistry of chitosan. Carbohydr Polym 2021; 256:117576. [PMID: 33483071 DOI: 10.1016/j.carbpol.2020.117576] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 12/11/2020] [Accepted: 12/27/2020] [Indexed: 11/19/2022]
Abstract
Chitosans with different average degrees of acetylation and weight molecular weight were analyzed by time-domain NMR relaxometry using the recently proposed pulse sequence named Rhim and Kessemeier - Radiofrequency Optimized Solid-Echo (RK-ROSE) to acquire 1H NMR signal of solid-state materials. The NMR signal decay was composed of faster (tenths of μs) and longer components, where the mobile-part fraction exhibited an effective relaxation transverse time assigned to methyl hydrogens from N-acetyl-d-glucosamine (GlcNAc) units. The higher intrinsic mobility of methyl groups was confirmed via DIPSHIFT experiments by probing the 1H-13C dipolar interaction. RK-ROSE data were modeled by using Partial Least Square (PLS) multivariate regression, which showed a high coefficient of determination (R2 > 0.93) between RK-ROSE signal profile and average degrees of acetylation and crystallinity index, thus indicating that time-domain NMR consists in a promising tool for structural and morphological characterization of chitosan.
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Affiliation(s)
- William Marcondes Facchinatto
- Sao Carlos Institute of Chemistry, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 780, Sao Carlos, SP, Brazil.
| | - Rodrigo Henrique Dos Santos Garcia
- Sao Carlos Institute of Chemistry, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 780, Sao Carlos, SP, Brazil
| | - Danilo Martins Dos Santos
- Brazilian Corporation for Agricultural Research, Embrapa Instrumentation, Rua XV de Novembro 1452, CEP 13560-970, Caixa Postal 741, Sao Carlos, SP, Brazil
| | - Anderson Fiamingo
- Sao Carlos Institute of Physics, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 369, Sao Carlos, SP, Brazil
| | - Douglas William Menezes Flores
- Superior College of Agriculture "Luiz de Queiroz", University of Sao Paulo, Av. Padua Dias 11, CEP 13418-900, Caixa Postal 9, Piracicaba, SP, Brazil
| | - Sérgio Paulo Campana-Filho
- Sao Carlos Institute of Chemistry, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 780, Sao Carlos, SP, Brazil
| | - Eduardo Ribeiro de Azevedo
- Sao Carlos Institute of Physics, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 369, Sao Carlos, SP, Brazil
| | - Luiz Alberto Colnago
- Brazilian Corporation for Agricultural Research, Embrapa Instrumentation, Rua XV de Novembro 1452, CEP 13560-970, Caixa Postal 741, Sao Carlos, SP, Brazil
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Zhang H, Du L, Wang L, Liu J, Wan Q, Kwok RTK, Lam JWY, Phillips DL, Tang BZ. Visualization and Manipulation of Molecular Motion in the Solid State through Photoinduced Clusteroluminescence. J Phys Chem Lett 2019; 10:7077-7085. [PMID: 31663748 DOI: 10.1021/acs.jpclett.9b02752] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The development of molecular machines has long been a dream of scientists and is expected to revolutionize many aspects of technology and medicine. As the prerequisite of a practicable molecular machine, studies on the solid-state molecular motion (SSMM) are not only of scientific importance but also practically useful. Herein, two nonconjugated molecules, 1,2-diphenylethane (s-DPE) and 1,2-bis(2,4,5-trimethylphenyl)ethane (s-DPE-TM), are synthesized, and their SSMM is investigated. Experimental and calculation results reveal that s-DPE and s-DPE-TM are capable of performing light-driven SSMM to form excited-state through-space complexes (ESTSC). The radiative decay of ESTSC generates an unexpected visible emission termed clusteroluminescence, which serves as a tool to visualize the process of SSMM. Meanwhile, the original packing structure can be recovered from ESTSC after the removal of light irradiation. This work provides a new strategy to manipulate and "see" the SSMM and gains new insights into clusteroluminescence.
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Affiliation(s)
- Haoke Zhang
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced Study , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong SAR, China
- HKUST-Shenzhen Research Institute , No. 9 Yuexing First Road , South Area, Hi-tech Park, Nanshan, Shenzhen 518057 , China
| | - Lili Du
- Department of Chemistry , The University of Hong Kong , Pokfulam Road , Pok Fu Lam , Hong Kong SAR, China
- Institute of Life Sciences , Jiangsu University , Zhenjiang 212013 , China
| | - Lin Wang
- School of Biomedical Sciences, Faculty of Medicine , The Chinese University of Hong Kong , Shatin , NT, Hong Kong SAR, China
| | - Junkai Liu
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced Study , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong SAR, China
- HKUST-Shenzhen Research Institute , No. 9 Yuexing First Road , South Area, Hi-tech Park, Nanshan, Shenzhen 518057 , China
| | - Qing Wan
- Center for Aggregation-Induced Emission, State Key Laboratory of Luminescent Materials and Devices, SCUT-HKUST Joint Research Institute , South China University of Technology , Tianhe Qu, Guangzhou 510640 , China
| | - Ryan T K Kwok
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced Study , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong SAR, China
- HKUST-Shenzhen Research Institute , No. 9 Yuexing First Road , South Area, Hi-tech Park, Nanshan, Shenzhen 518057 , China
| | - Jacky W Y Lam
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced Study , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong SAR, China
- HKUST-Shenzhen Research Institute , No. 9 Yuexing First Road , South Area, Hi-tech Park, Nanshan, Shenzhen 518057 , China
| | - David Lee Phillips
- Department of Chemistry , The University of Hong Kong , Pokfulam Road , Pok Fu Lam , Hong Kong SAR, China
| | - Ben Zhong Tang
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced Study , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong SAR, China
- HKUST-Shenzhen Research Institute , No. 9 Yuexing First Road , South Area, Hi-tech Park, Nanshan, Shenzhen 518057 , China
- Center for Aggregation-Induced Emission, State Key Laboratory of Luminescent Materials and Devices, SCUT-HKUST Joint Research Institute , South China University of Technology , Tianhe Qu, Guangzhou 510640 , China
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