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Ji R, Zhang X, Chen Z, Song S, Li Y, Zhang X, Zhang W. Effect of metal cation crosslinking on the mechanical properties and shrimp freshness monitoring sensitivity of pectin/carboxymethyl cellulose sodium/anthocyanin intelligent films. Carbohydr Polym 2024; 340:122285. [PMID: 38858002 DOI: 10.1016/j.carbpol.2024.122285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 04/22/2024] [Accepted: 05/15/2024] [Indexed: 06/12/2024]
Abstract
Although many preparation methods have been reported so far, it is still a great challenge for intelligent packaging films with both excellent mechanical properties and very high sensitivity. Herein, we report a facile method to prepare performance-enhanced pectin (PC)/carboxymethyl cellulose sodium (CMC)/anthocyanins (ACNs)/metal ion films by crosslinking with metal ions (Zn2+, Mg2+ and Ca2+). Cross-linking reaction between PC/CMC and metal ions significantly improved water resistance and mechanical properties of composite films (P < 0.05). Even at high relative humidity (RH = 84 %), cross-linking of Ca2+, Mg2+, and Zn2+ significantly increased the tensile index of the films by 1.37, 1.41, and 1.52 times (P < 0.05), respectively. Moreover, the complexation of metal ions/polysaccharides with ACNs reduced the decomposition rate of ACNs, improved the storage stability and antioxidant capacity of ACNs, and also increased the sensitivity of the colorimetric response of the indicator films in monitoring shrimp freshness. Thus, with this high sensitivity, the Red, Green and Blue (RGB) values of the films can be determined using a mobile phone application to monitor shrimp safety in real time. These results suggest that ACNs-metal cation-polysaccharide composite films have great potential for smart packaging applications.
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Affiliation(s)
- Run Ji
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, PR China
| | - Xinhua Zhang
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, PR China
| | - Zhao Chen
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, PR China
| | - Shuang Song
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, PR China
| | - Yingying Li
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, PR China
| | - Xiuling Zhang
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, PR China.
| | - Wentao Zhang
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, PR China.
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Zhu L, Ouyang F, Fu X, Wang Y, Li T, Wen M, Zha G, Yang X. Tannic acid modified keratin/sodium alginate/carboxymethyl chitosan biocomposite hydrogels with good mechanical properties and swelling behavior. Sci Rep 2024; 14:12864. [PMID: 38834664 DOI: 10.1038/s41598-024-63186-6] [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: 02/15/2024] [Accepted: 05/27/2024] [Indexed: 06/06/2024] Open
Abstract
Natural polymer-based hydrogels have demonstrated great potential as wound-healing dressings. They help to maintain a moist wound environment as well as promote faster healing. In this work, a multifunctional hydrogel was prepared using keratin, sodium alginate, and carboxymethyl chitosan with tannic acid modification. Micro-morphology of hydrogels has been performed by scanning electron microscopy. Fourier Transform Infrared Spectroscopy reveals the presence of hydrogen bonding. The mechanical properties of the hydrogels were examined using a universal testing machine. Furthermore, we investigated several properties of the modified hydrogel. These properties include swelling rate, water retention, anti-freezing properties, antimicrobial and antioxidant properties, hemocompatibility evaluation and cell viability test in vitro. The modified hydrogel has a three-dimensional microporous structure, the swelling rate was 1541.7%, the elastic modulus was 589.74 kPa, the toughness was 211.74 kJ/m3, and the elongation at break was 75.39%, which was similar to the human skin modulus. The modified hydrogel also showed inhibition of S. aureus and E. coli, as well as a DPPH scavenging rate of 95%. In addition, the modified hydrogels have good biological characteristics. Based on these findings, the K/SA/CCS hydrogel holds promise for applications in biomedical engineering.
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Affiliation(s)
- Liqing Zhu
- College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, China
| | - Fenfen Ouyang
- College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, China
| | - Xue Fu
- College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, China
| | - Yimei Wang
- College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, China
| | - Ting Li
- College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, China
| | - Min Wen
- College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, China
| | - Guodong Zha
- HEMOS (Chongqing) Bioscience Co., Ltd., Building #2, No.216, Jianshan Road, Bishan District, Chongqing, China
| | - Xue Yang
- Department of Pharmacy, Army Medical Center of PLA, Chongqing, China.
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3
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Durairaj S, Sridhar D, Ströhle G, Li H, Chen A. Bactericidal Effect and Cytotoxicity of Graphene Oxide/Silver Nanocomposites. ACS APPLIED MATERIALS & INTERFACES 2024; 16:18300-18310. [PMID: 38574271 DOI: 10.1021/acsami.3c15798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
To tackle the proliferation of pathogenic microorganisms without relying on antibiotics, innovative materials boasting antimicrobial properties have been engineered. This study focuses on the development of graphene oxide/silver (GO/Ag) nanocomposites, derived from partially reduced graphene oxide adorned with silver nanoparticles. Various nanocomposites with different amounts of silver (GO/Ag-1, GO/Ag-2, GO/Ag-3, and GO/Ag-4) were synthesized, and their antibacterial efficacy was systematically studied. The silver nanoparticles were uniformly deposited on the partially reduced graphene oxide surface, exhibiting spherical morphologies with an average size of 25 nm. The nanocomposites displayed potent antibacterial properties against both gram-positive bacteria (S. aureus and B. subtilis) and gram-negative bacteria (E. coli and S. enterica) as confirmed by minimum inhibition concentration (MIC) studies and time-dependent experiments. The optimal MIC for Gram-positive bacteria was 62.5 μg/mL and for Gram-negative bacteria was 125 μg/mL for the GO/Ag nanocomposites. Bacterial cells that encountered the nanocomposite films exhibited significantly greater inhibitory effects compared to those exposed to conventional antibacterial materials. Furthermore, the cytotoxicity of these nanocomposites was assessed using human epithelial cells (HEC), revealing that GO/Ag-1 and GO/Ag-2 exhibited lower toxicity levels toward HEC and remained compatible even at higher dilution rates. This study underscores the potential of GO/Ag-based nanocomposites as versatile materials for antibacterial applications, particularly as biocompatible wound dressings, offering promising prospects for wound healing and infection control.
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Affiliation(s)
- Sharmila Durairaj
- Electrochemical Technology Centre, Department of Chemistry, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
| | - Deepak Sridhar
- Zentek Ltd., 24 Corporate Court, Guelph, Ontario N1G 5G5, Canada
| | - Gisela Ströhle
- School of Engineering, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
| | - Huiyan Li
- School of Engineering, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
| | - Aicheng Chen
- Electrochemical Technology Centre, Department of Chemistry, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
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Gong D, Yang P, Zhao J, Jia X. Selective removal of thallium from water by MnO 2-doped magnetic beads: Performance and mechanism study. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 353:120147. [PMID: 38325278 DOI: 10.1016/j.jenvman.2024.120147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 12/22/2023] [Accepted: 01/15/2024] [Indexed: 02/09/2024]
Abstract
Aqueous thallium has posed an increasing threat to environment as human's intensified activities in mining, refining, process and discharge. Remediation on thallium pollution has been of up-most importance to water treatment. In present work, MnO2 and magnetic Fe3O4 have been implanted to sodium alginate (SA) in presence of carboxyl methyl cellulose (CMC), and the resultant beads consisted of SA/CMC/MnO2/Fe3O4 were characterized. The materials were applied to treatment of Tl-contaminated water as adsorbent in lab. The removal results revealed that the adsorption capacity reached 38.8 mg (Tl)·g (beads)-1 and almost 100 % removal efficiency was achieved. The residual Tl was below 0.1 μg·L-1, meeting the discharge standard regulated in China. The kinetic adsorption was better described as a pseudo-second-order and three-step intra-particle diffusion model. Freundlich isotherm was well fitted the experimental data. The absorbent shown an excellent competitive specificity (KTl/M: ∼104!) over common hazardous ions Cu2+, Cd2+, Co2+, Pb2+ and Cr3+, as well as naturally abundant K+ and Na+ (KTl/M: 10-102) in mimic environmental conditions. Regeneration and reusability of the absorbent was also verified by five absorption-desorpotion cycles. XPS results revealed that a redox reaction between Mn4+ with Tl+, and an ion exchange of H+ (-O-Fe) and Tl+ were assumed to be main process for the specific capturing. This study provided an efficient SA/CMC/MnO2/Fe3O4 composite beads that could be a promising adsorbent for Tl-polluted water treatment.
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Affiliation(s)
- Dirong Gong
- Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, PR China.
| | - Panpan Yang
- Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, PR China
| | - Junyi Zhao
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, No.1799, Jimei Road, Xiamen, Fujian, 361021, PR China; ZheJiang Key Laboratory of Urban Environmental Processes and Pollution Control, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo, 315830, PR China
| | - Xiaoyu Jia
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, No.1799, Jimei Road, Xiamen, Fujian, 361021, PR China; ZheJiang Key Laboratory of Urban Environmental Processes and Pollution Control, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo, 315830, PR China.
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Dai Y, Xu Y, Jiang D, Bai L, Li Z, Huo P, Liu C, Liu Y. Electromagnetic interference shielding of flexible carboxymethyl cellulose/MWCNT@Fe 3O 4 composite film with ultralow reflection loss. Int J Biol Macromol 2024; 257:128604. [PMID: 38056729 DOI: 10.1016/j.ijbiomac.2023.128604] [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: 06/15/2023] [Revised: 11/25/2023] [Accepted: 12/02/2023] [Indexed: 12/08/2023]
Abstract
Nowadays, various high-performance electromagnetic interference (EMI) shielding materials have enormous application potential in electronic field. However, traditional EMI shielding materials often have high conductivity, resulting in the serious mismatch between the impedance of the material surface and the free space, which will cause a large amount of reflection of electromagnetic (EM) waves, leading to secondary reflection pollution. In this paper, we report a novel flexible EMI shielding composite film with extremely low reflection loss and efficient EM wave absorption, which was prepared by assisted self-assembly based on simple vacuum filtration using carboxymethyl cellulose as the matrix and MWCNT@Fe3O4 synthesized by chemical coprecipitation as the composite functional filler. By adjusting the Fe3O4 coating degree of MWCNTs in the filler, the composite film achieved the construction of a conductive network with high Fe3O4 content. Benefit by the good adaptability of conductivity and magnetic permeability, the composite film has good impedance matching ability and microwave absorption performance. The reflection loss of the composite film with the thickness of 28 μm in the X-band was only 0.23 dB, accounting for 1.7 % of the total loss. This work provides new insights for the development of EMI materials and effective mitigation secondary EM wave reflection pollution.
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Affiliation(s)
- Yaohui Dai
- College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China; Key Laboratory of Bio-based Materials Science & Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China
| | - Ying Xu
- College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China
| | - Dexing Jiang
- College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China; Key Laboratory of Bio-based Materials Science & Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China
| | - Long Bai
- College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China; Key Laboratory of Bio-based Materials Science & Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China
| | - Zhiguo Li
- College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China; Key Laboratory of Bio-based Materials Science & Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China
| | - Pengfei Huo
- College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China; Key Laboratory of Bio-based Materials Science & Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China
| | - Changwei Liu
- Institute of Petro chemistry, Heilongjiang Academy of Science, Harbin 150040, PR China.
| | - Yang Liu
- College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China; Key Laboratory of Bio-based Materials Science & Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China.
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Feng X, Li Y, Cui Z, Tang R. Sodium alginate/carboxymethyl cellulose films embedded with liposomes encapsulated green tea extract: characterization, controlled release, application. RSC Adv 2024; 14:245-254. [PMID: 38173599 PMCID: PMC10758806 DOI: 10.1039/d3ra05196j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 12/01/2023] [Indexed: 01/05/2024] Open
Abstract
To maintain the freshness of the fruit during storage, sodium alginate/carboxymethyl cellulose films embedded with pH-senstive liposomes encapsulated green tea extract were developed (SA/CMC/TP-Lip). An orthogonal design was used to optimise the preparation of TP-Lip and SA/CMC/TP-Lip was prepared through response surface. The stability of TP-Lip structure was measured. The morphology of SA/CMC/TP-Lip was characterised by SEM, and the mechanical properties and oxidation resistance of films were measured. Special attention was paid to the pH sensitivity of TP-Lip and the improvement of film properties. The zeta potential and encapsulation rate of TP-Lip were -45.85 ± 2.13 mV and 61.45 ± 0.23%. The average release rate of TP encapsulated into TP-Lip at pH 3 was 41.08%, an increase of 23.07% over pH 6 during 12 h. SEM and FTIR showed that TP-Lip was structurally stable and had good compatibility with SA/CMC. Tensile strength was increased by 30.55% and DPPH radical scavenging capacity was increased by 7.16% with the addition of TP-Lip. SA/CMC/TP-Lip is applied to blueberries to reduce their weight loss and improve the loss of freshness of blueberries during storage. Thus, SA/CMC/TP-Lip could provide a new way to extend active packaging materials and maintain fruit freshness during storage.
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Affiliation(s)
- Xin Feng
- Department of Forestry Engineering, Northeast Forestry University Harbin Heilongjiang China
| | - Yang Li
- Department of Logistics Engineering and Management, Northeast Forestry University Harbin Heilongjiang China
| | - Zhuoyu Cui
- Department of Forestry Engineering, Northeast Forestry University Harbin Heilongjiang China
| | - Rongrong Tang
- Department of Logistics Engineering and Management, Northeast Forestry University Harbin Heilongjiang China
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Shen Y, Seidi F, Ahmad M, Liu Y, Saeb MR, Akbari A, Xiao H. Recent Advances in Functional Cellulose-based Films with Antimicrobial and Antioxidant Properties for Food Packaging. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:16469-16487. [PMID: 37877425 DOI: 10.1021/acs.jafc.3c06004] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
The packaging of food plays a crucial role in food preservation worldwide. However, traditional packaging systems are passive layers with weak efficiency in protecting the food quality. Therefore, packaged foods are gradually spoiled due to the oxidation and growth of microorganisms. Additionally, most of the commercial packaging films are made of petroleum-based materials which raise environmental concerns. Accordingly, the development of eco-friendly natural-derived active packaging systems has increased the attention of scientists. Cellulose as the most abundant polysaccharide on earth with high biocompatibility, no toxicity, and high biodegradability has extensively been applied for the fabrication of packaging films. However, neat cellulose-based films lack antioxidant and antimicrobial activities. Therefore, neat cellulose-based films are passive films with weak food preservation performance. Active films have been developed by incorporating antioxidants and antimicrobial agents into the films. In this review, we have explored the latest research on the fabrication of antimicrobial/antioxidant cellulose-based active packaging films by incorporating natural extracts, natural polyphenols, nanoparticles, and microparticles into the cellulose-based film formulations. We categorized these types of packaging films into two main groups: (i) blend films which are obtained by mixing solutions of cellulose with other soluble antimicrobial/antioxidant agents such as natural extracts and polyphenols; and (ii) composite films which are fabricated by dispersing antimicrobial/antioxidant nano- or microfillers into the cellulose solution. The effect of these additives on the antioxidant and antimicrobial properties of the films has been explained. Additionally, the changes in the other properties of the films such as hydrophilicity, water evaporation rate, and mechanical properties have also been briefly addressed.
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Affiliation(s)
- Yihan Shen
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, P. R. China
| | - Farzad Seidi
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, P. R. China
| | - Mehraj Ahmad
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, P. R. China
| | - Yuqian Liu
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, P. R. China
| | - Mohammad Reza Saeb
- Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland
| | - Ali Akbari
- Solid Tumor Research Center, Cellular and Molecular Medicine Research Institute, Urmia University of Medical Sciences, Shafa Street, Ershad Boulevard, P.O. Box: 1138, Urmia 57147, Iran
| | - Huining Xiao
- Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3 Canada
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Saravanan H, Subramani T, Rajaramon S, David H, Sajeevan A, Sujith S, Solomon AP. Exploring nanocomposites for controlling infectious microorganisms: charting the path forward in antimicrobial strategies. Front Pharmacol 2023; 14:1282073. [PMID: 37829306 PMCID: PMC10565656 DOI: 10.3389/fphar.2023.1282073] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 09/18/2023] [Indexed: 10/14/2023] Open
Abstract
Nanocomposites, formed by combining a matrix (commonly polymer or ceramic) with nanofillers (nano-sized inclusions like nanoparticles or nanofibers), possess distinct attributes attributed to their composition. Their unique physicochemical properties and interaction capabilities with microbial cells position them as a promising avenue for infectious disease treatment. The escalating prevalence of multi-drug resistant bacteria intensifies the need for alternative solutions. Traditional approaches involve antimicrobial agents like antibiotics, antivirals, and antifungals, targeting specific microbial aspects. This review presents a comprehensive overview of diverse nanocomposite types and highlights the potential of tailored matrix and antibacterial agent selection within nanocomposites to enhance treatment efficacy and decrease antibiotic resistance risks. Challenges such as toxicity, safety, and scalability in clinical applications are also acknowledged. Ultimately, the convergence of nanotechnology and infectious disease research offers the prospect of enhanced therapeutic strategies, envisioning a future wherein advanced materials revolutionize the landscape of medical treatment.
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Affiliation(s)
| | | | | | | | | | | | - Adline Princy Solomon
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, India
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Marin-Silva DA, Romano N, Damonte L, Giannuzzi L, Pinotti A. Hybrid materials based on chitosan functionalized with green synthesized copper nanoparticles: Physico-chemical and antimicrobial analysis. Int J Biol Macromol 2023; 242:124898. [PMID: 37207748 DOI: 10.1016/j.ijbiomac.2023.124898] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 05/09/2023] [Accepted: 05/12/2023] [Indexed: 05/21/2023]
Abstract
Recently, the development of materials with antimicrobial properties has become a challenge under scrutiny. The incorporation of copper nanoparticles (NpCu) into a chitosan matrix appears to represent a viable strategy to contain the particles and prevent their oxidation. Regarding the physical properties, the nanocomposite films (CHCu) showed a decrease in the elongation at break (5 %) and an increase in the tensile strength of 10 % concerning chitosan films (control). They also showed solubility values lower than 5 % while the swelling diminished by 50 %, on average. The dynamical mechanical analysis (DMA) of nanocomposites revealed two thermal events located at 113° and 178 °C, which matched the glass transitions of the CH-enriched phase and nanoparticles-enriched phase, respectively. In addition, the thermogravimetric analysis (TGA) detected a greater stability of the nanocomposites. Chitosan films and the NpCu-loaded nanocomposites demonstrated excellent antibacterial capacity against Gram-negative and Gram-positive bacteria, proved through diffusion disc, zeta potential, and ATR-FTIR techniques. Additionally, the penetration of individual NpCu particles into bacterial cells and the leakage of cell content were verified by TEM. The mechanism of the antibacterial activity of the nanocomposites involved the interaction of chitosan with the bacterial outer membrane or cell wall and the diffusion of the NpCu through the cells. These materials could be applied in diverse fields of biology, medicine, or food packaging.
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Affiliation(s)
- Diego Alejandro Marin-Silva
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CCT-CONICET La Plata, UNLP, CICPBA), 47 y 116 S/N, 1900 La Plata, Argentina
| | - Nelson Romano
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CCT-CONICET La Plata, UNLP, CICPBA), 47 y 116 S/N, 1900 La Plata, Argentina
| | - Laura Damonte
- Dto. de Física, UNLP-IFLP, CCT-CONICET La Plata, Argentina; Facultad de Ciencias Exactas, UNLP, La Plata, Argentina
| | - Leda Giannuzzi
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CCT-CONICET La Plata, UNLP, CICPBA), 47 y 116 S/N, 1900 La Plata, Argentina; Facultad de Ciencias Exactas, UNLP, La Plata, Argentina
| | - Adriana Pinotti
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CCT-CONICET La Plata, UNLP, CICPBA), 47 y 116 S/N, 1900 La Plata, Argentina; Facultad de Ingeniería, UNLP, La Plata, Argentina.
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Yang X, Guo Y, Kong L, Lu J, Lin B, Xu C. Biobased epoxidized natural rubber/sodium carboxymethyl cellulose composites with enhanced strength and healing ability. Int J Biol Macromol 2023; 242:124681. [PMID: 37141968 DOI: 10.1016/j.ijbiomac.2023.124681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 04/25/2023] [Accepted: 04/27/2023] [Indexed: 05/06/2023]
Abstract
Conventional vulcanized rubbers cause a non-negligible waste of resources due to the formation of 3D irreversible covalently cross-linked networks. The introduction of reversible covalent bonds, such as reversible disulfide bonds, into the rubber network, is an available solution to the above problem. However, the mechanical properties of rubber with only reversible disulfide bonds cannot meet most practical applications. In this paper, a strengthened bio-based epoxidized natural rubber (ENR) composite reinforced by sodium carboxymethyl cellulose (SCMC) was prepared. SCMC forms a mass of hydrogen bonds between its hydroxyl groups and the hydrophilic groups of ENR chain, which gives the ENR/2,2'-Dithiodibenzoic acid (DTSA)/SCMC composites an enhanced mechanical performance. With 20 phr SCMC, the tensile strength of the composite increases from 3.0 to 10.4 MPa, which is almost 3.5 times that of the ENR/DTSA composite without SCMC. Simultaneously, DTSA covalently cross-linked ENR with the introduction of reversible disulfide bonds, which enables the cross-linked network to rearrange its topology at low temperatures and thus endows the ENR/DTSA/SCMC composites with healing properties. The ENR/DTSA/SCMC-10 composite has a considerable healing efficiency of about 96 % after healing at 80 °C for 12 h.
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Affiliation(s)
- Xueli Yang
- Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, School of Chemistry and Chemical Engineering, Guangxi University, No. 100, Daxuedong Road, Xixiangtang District, Nanning 530004, China
| | - Yuanming Guo
- Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, School of Chemistry and Chemical Engineering, Guangxi University, No. 100, Daxuedong Road, Xixiangtang District, Nanning 530004, China
| | - Lingli Kong
- Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, School of Chemistry and Chemical Engineering, Guangxi University, No. 100, Daxuedong Road, Xixiangtang District, Nanning 530004, China
| | - Junjie Lu
- Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, School of Chemistry and Chemical Engineering, Guangxi University, No. 100, Daxuedong Road, Xixiangtang District, Nanning 530004, China
| | - Baofeng Lin
- Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, School of Chemistry and Chemical Engineering, Guangxi University, No. 100, Daxuedong Road, Xixiangtang District, Nanning 530004, China
| | - Chuanhui Xu
- Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, School of Chemistry and Chemical Engineering, Guangxi University, No. 100, Daxuedong Road, Xixiangtang District, Nanning 530004, China.
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