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Abu Elella MH, Aamer N, Abdallah HM, López-Maldonado EA, Mohamed YMA, El Nazer HA, Mohamed RR. Novel high-efficient adsorbent based on modified gelatin/montmorillonite nanocomposite for removal of malachite green dye. Sci Rep 2024; 14:1228. [PMID: 38216651 PMCID: PMC10786822 DOI: 10.1038/s41598-024-51321-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Accepted: 01/03/2024] [Indexed: 01/14/2024] Open
Abstract
Shortage of drinking water has gained potential interest over the last few decades. Discharged industrial effluent, including various toxic pollutants, to water surfaces is one of the most serious environmental issues. The adsorption technique has become a widely studied method for the removal of toxic pollutants, specifically synthetic dyes, from wastewater due to its cost-effectiveness, high selectivity, and ease of operation. In this study, a novel gelatin-crosslinked-poly(acrylamide-co-itaconic acid)/montmorillonite (MMT) nanoclay nanocomposites-based adsorbent has been prepared for removing malachite green (MG) dye from an aqueous solution. Modified gelatin nanocomposites were synthesized using a free-radical polymerization technique in the presence and absence of MMT. Various analytical instrumentation: including FTIR, FESEM, XRD, and TEM techniques were used to elucidate the chemical structure and surface morphology of the prepared samples. Using a batch adsorption experiment, Langmuir isotherm model showed that the prepared modified gelatin nanocomposite had a maximum adsorption capacity of 950.5 mg/g using 350 mg/L of MG dye at pH 9 within 45 min. Furthermore, the regeneration study showed good recyclability for the obtained nanocomposite through four consecutive reusable cycles. Therefore, the fabricated gelatin nanocomposite is an attractive adsorbent for MG dye elimination from aqueous solutions.
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Affiliation(s)
| | - Nema Aamer
- Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt
| | - Heba M Abdallah
- Polymers and Pigments Department, Chemical Industries Research Institute, National Research Centre, Dokki , Giza, 12622, Egypt
| | - Eduardo A López-Maldonado
- Faculty of Chemical Sciences and Engineering, Autonomous University of Baja California, CP: 22390, Tijuana, Baja California, Mexico
| | - Yasser M A Mohamed
- Photochemistry Department, National Research Center, Dokki, Giza, 12622, Egypt
| | - Hossam A El Nazer
- Photochemistry Department, National Research Center, Dokki, Giza, 12622, Egypt
| | - Riham R Mohamed
- Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt
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Awed M, Mohamed RR, Kamal KH, Sabaa MW, Ali KA. Tosyl-carrageenan/alginate composite adsorbent for removal of Pb 2+ ions from aqueous solutions. BMC Chem 2024; 18:8. [PMID: 38184657 PMCID: PMC10771639 DOI: 10.1186/s13065-023-01103-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 12/11/2023] [Indexed: 01/08/2024] Open
Abstract
The current study effectively designed novel cross-linked tosyl-carrageenan/alginate (Ts-Car/Alg) beads to remove Pb2+ ions from their aqueous solutions. To confirm the structure of the produced matrix, characterization methods such as XRD, SEM, FTIR, and EDX were used. Batch experiments were employed in order to further evaluate the adsorption efficiency of Pb2+ ions. Additionally, various variables, including contact time, solution pH, adsorbent dosage, and initial concentration of Pb2+ ions were investigated using atomic absorption. The results of this study showed that the adsorption equilibrium increased as Pb2+ ions concentration increased at pH = 5.3 after a contact time of 120 min, with 0.3 g of Ts-Car/Alg that having the best adsorption capacity at 74 mg/g. The adsorption progression was further examined using the kinetic and isothermal models. With a correlation coefficient of 0.975, the Freundlich model was thought to better fit Pb2+ ions adsorption from the isotherm investigation. Also, the adsorption kinetics were investigated using a pseudo-second-order model with 1/n ratio of 0.683. This Ts-Car/Alg adsorbent is regarded as an effective candidate to be used for water treatment because the reusability process of produced beads was successfully completed twice, and the adsorbent maintained its ability to remove Pb2+ ions. The prepared Ts-Car/Alg beads are therefore excellent candidates to be used as potent Pb2+ ions adsorbents from their aqueous solutions. The Ts-Car/Alg beads' regeneration and reusability investigation for the removal of heavy metal ions was completed in at least two successful cycles.
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Affiliation(s)
- Mohamed Awed
- Center of Excellence for Advanced Science, Advanced Materials and Nanotechnology Group National Research Centre, Dokki, Giza, 12622, Egypt
| | - Riham R Mohamed
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Kholod H Kamal
- Water Pollution Research Department, National Research Centre, Giza, 12622, Egypt
| | - Magdy W Sabaa
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Korany A Ali
- Center of Excellence for Advanced Science, Advanced Materials and Nanotechnology Group National Research Centre, Dokki, Giza, 12622, Egypt.
- Applied Organic Chemistry Department, National Research Centre, Dokki, Giza, 12622, Egypt.
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Hanna DH, El-Mazaly MH, Mohamed RR. Synthesis of biodegradable antimicrobial pH-sensitive silver nanocomposites reliant on chitosan and carrageenan derivatives for 5-fluorouracil drug delivery toward HCT116 cancer cells. Int J Biol Macromol 2023; 231:123364. [PMID: 36693607 DOI: 10.1016/j.ijbiomac.2023.123364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/12/2023] [Accepted: 01/17/2023] [Indexed: 01/22/2023]
Abstract
The current research relies on a one-pot green biosynthesis of silver nanoparticles (SNPs) with various ratios of silver (Ag) in the existence of N, N, N-trimethyl chitosan chloride (TMC) and carboxymethyl kappa-carrageenan (CMKC), to investigate the effectiveness of the synthesized silver nanocomposites (SNCs) as pH sensitive biodegradable carrier for orally intestinal delivery of 5-fluorouracil (5-FU) drug. FTIR, XRD, TEM and FE-SEM/EDX methods were utilized to demonstrate the structure of the prepared polyelectrolyte complex PEC (TMC/CMKC) and SNCs (TMC/CMKC/Ag). The results showed that the 5-FU encapsulation effectiveness inside all of the prepared SNCs samples was improved by increasing the concentration of Ag, reaching 92.16 ± 0.57 % with 3 % Ag. In vitro release behavior of 5-FU loaded SNC 3 % (TMC/CMKC/Ag 3 %), displayed slow and sustained release reaching 96.3 ± 0.81 % up to 24 h into pH 7.4 medium. The successful release of 5-FU from the loaded SNC 3 % was confirmed through occurrence of strong cytotoxicity, with an IC50 value of 31.15 μg/ml, and high % of apoptotic cells (30.66 %) within the treated HCT116 cells. Besides, SNC 3 % showed good biodegradability and antimicrobial properties against different bacterial strains. Overall, SNC 3 % can be suggested as an effective system for both controlled drug delivery and antibacterial action.
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Affiliation(s)
- Demiana H Hanna
- Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt.
| | - Marwa H El-Mazaly
- Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - Riham R Mohamed
- Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt
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Abdel-Aziem AA, Mohamed RR, Draz AH, Azab AR, Hegazy FA, Diab RH. The effect of McKenzie protocol vs. deep neck flexor and scapulothoracic exercises in subjects with chronic neck pain - a randomized controlled study. Eur Rev Med Pharmacol Sci 2022; 26:3138-3150. [PMID: 35587064 DOI: 10.26355/eurrev_202205_28731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
OBJECTIVE This study investigated the impact of McKenzie exercises against deep neck flexor (DNF) combined with scapulothoracic exercises on improving pain severity, cervical mobility, and functional disability. PATIENTS AND METHODS Fifty-five subjects suffering from chronic neck pain participated in this randomized controlled study. They were randomly assigned to three groups; the DNF group, which was treated by traditional physical therapy (i.e., physical therapy agents, stretching, and isometric exercises), combined with DNF, and scapulothoracic exercises; the McKenzie group, treated by traditional physical therapy, combined with McKenzie exercises; and finally, a control group, treated by traditional physical therapy. Before and after 6 weeks of treatment, they were assessed for neck pain severity, cervical range of motion (ROM), and functional disability using a visual analog scale (VAS), a gravity-reference goniometer, and the Copenhagen neck functional disability scale (CNFDS), respectively. RESULTS Compared to baseline, all groups showed a significant decrease in neck pain severity and disability (p <0.05), and there was a significant increase in neck flexion/extension, lateral right flexion/left flexion, and right/left rotation ROMs (p<0.05). The improvement of the McKenzie group was significantly higher than the DNF group, and control group. Moreover, the improvement of the DNF group was significantly higher than the control group (p<0.05). CONCLUSIONS The McKenzie exercises were better than DNF combined with scapulothoracic exercises to treat neck pain, functional disability, and mobility.
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Affiliation(s)
- A A Abdel-Aziem
- Department of Biomechanics, Department of Basic Sciences, Faculty of Physical Therapy, Cairo University, Giza, Egypt.
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Arafa EG, Sabaa MW, Mohamed RR, Elzanaty AM, Abdel-Gawad OF. Preparation of biodegradable sodium alginate/carboxymethylchitosan hydrogels for the slow-release of urea fertilizer and their antimicrobial activity. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2022.105243] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Elella MHA, Aamer N, Mohamed YMA, El Nazer HA, Mohamed RR. Innovation of high-performance adsorbent based on modified gelatin for wastewater treatment. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04079-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Abu Elella MH, Shalan AE, Sabaa MW, Mohamed RR. One-pot green synthesis of antimicrobial chitosan derivative nanocomposites to control foodborne pathogens. RSC Adv 2021; 12:1095-1104. [PMID: 35425120 PMCID: PMC8978815 DOI: 10.1039/d1ra07070c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 12/03/2021] [Indexed: 12/21/2022] Open
Abstract
Food contamination by foodborne pathogens is considered a serious problem worldwide. This study aimed to show the efficacy of the one-pot green biosynthesis of nanocomposites as effective antimicrobial agents based on a water-soluble biodegradable polysaccharide and silver nitrate (AgNO3). Silver (Ag) nanoparticles were synthesized using different concentrations of AgNO3 solution (1, 2, and 3 mM) in the presence of N-quaternized chitosan and N,N,N-trimethyl chitosan chloride (TMC) as both a reducing and stabilizing agent. In addition, the structure of TMC/Ag nanocomposites was confirmed using different analytical tools including FTIR, UV-Vis, XRD, HR-TEM, FE-SEM, and EDX techniques. The FTIR spectra and UV-Vis spectra showed the main characteristic absorption peaks of Ag nanoparticles. In addition, FE-SEM images showed the formation of spherical bead-like particles on the surface of TMC. Correspondingly, the EDX spectrum showed a peak for silver, indicating the successful synthesis of Ag nanoparticles inside the TMC chains. Moreover, HR-TEM images exhibited the good distribution of Ag nanoparticles, which appeared as nano-spherical shapes. The antimicrobial activity of TMC/Ag nanocomposites was examined against three foodborne pathogens, including Salmonella Typhimurium as a Gram-negative bacterium, Bacillus subtilis as a Gram-positive bacterium and Aspergillus fumigatus as a fungus. The results showed that TMC/Ag nanocomposites had better antimicrobial activity compared with TMC alone and their antimicrobial activity increased with an increase in the concentration of Ag. The results confirmed that the TMC/Ag nanocomposites can be potentially used as an effective antimicrobial agent in food preservation. This study aimed to show the efficacy of the one-pot green biosynthesis of nanocomposites as effective antimicrobial agents based on a water-soluble biodegradable polysaccharide and silver nitrate (AgNO3).![]()
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Affiliation(s)
| | - Ahmed Esmail Shalan
- Central Metallurgical Research and Development Institute (CMRDI) P. O. Box 87, Helwan Cairo 11421 Egypt .,BCMaterials, Basque Center for Materials, Applications and Nanostructures Martina Casiano, UPV/EHU Science Park, Barrio Sarriena s/n Leioa 48940 Spain
| | - Magdy W Sabaa
- Chemistry Department, Faculty of Science, Cairo University Giza 12613 Egypt
| | - Riham R Mohamed
- Chemistry Department, Faculty of Science, Cairo University Giza 12613 Egypt
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Ali MAM, Alsabagh AM, Sabaa MW, El-Salamony RA, Mohamed RR, Morsi RE. Polyacrylamide hybrid nanocomposites hydrogels for efficient water treatment. Iran Polym J 2020. [DOI: 10.1007/s13726-020-00810-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Abdel-Aziz MM, Elella MHA, Mohamed RR. Green synthesis of quaternized chitosan/silver nanocomposites for targeting mycobacterium tuberculosis and lung carcinoma cells (A-549). Int J Biol Macromol 2019; 142:244-253. [PMID: 31690471 DOI: 10.1016/j.ijbiomac.2019.09.096] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/24/2019] [Accepted: 09/13/2019] [Indexed: 01/06/2023]
Abstract
Lung cancer (LC) is the most-deadly type of cancer representing a major public health problem worldwide. Tuberculosis TB is another infectious disease influencing lungs that causes death especially in developing countries. The present study is the first to report antimycobacterial activity of TMC/Ag nanocomposite. It aims to solve the case of lung cancer and its most associative pathogen. The current study reports one pot green biosynthesis of silver nanocomposite in presence of biodegradable biopolymer (N,N,N-trimethyl chitosan chloride, TMC) as both reducing and stabilizing agent. The structure of TMC/Ag nanocomposite was characterized with different analysis tools including TEM, XRD and UV-vis spectrophotometer techniques. TEM images showed that Ag nanoparticles were well distributed spheres and their diameter ranged from 11 to17.5 nm. While, XRD pattern of TMC/Ag nanocomposite showed diffraction peaks related to the crystalline nature of Ag nanoparticles. In addition, UV-vis spectrum revealed a broad absorption peak at 400 nm attributing to the surface Plasmon resonance (SPR) of Ag. TMC/Ag nanocomposite exhibited a promising in vitro antimycobacterial activity with MIC of 1.95 μg/mL. On the other hand, The antitumor activity results of nanocomposites against both lung carcinoma cells (A-549) and normal lung cells (WI 38) revealed that nanocomposite cytotoxicity against A-549 cells with IC50 of 12.3 μg/mL, whereas the IC50 value against normal WI 38 cells was 357.2 μg/mL.
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Affiliation(s)
- Marwa M Abdel-Aziz
- Regional Center for Mycology and Biotechnology, Al-Azhar University, Cairo 11651, Egypt.
| | | | - Riham R Mohamed
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt.
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Sabaa MW, Hanna DH, Abu Elella MH, Mohamed RR. Encapsulation of bovine serum albumin within novel xanthan gum based hydrogel for protein delivery. Materials Science and Engineering: C 2019; 94:1044-1055. [DOI: 10.1016/j.msec.2018.10.040] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 10/02/2018] [Accepted: 10/09/2018] [Indexed: 12/22/2022]
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Abu Elella MH, Mohamed RR, Sabaa MW. Synthesis of novel grafted hyaluronic acid with antitumor activity. Carbohydr Polym 2018; 189:107-114. [DOI: 10.1016/j.carbpol.2018.02.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 01/17/2018] [Accepted: 02/01/2018] [Indexed: 12/27/2022]
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Abu Elella MH, Mohamed RR, Abdel-Aziz MM, Sabaa MW. Green synthesis of antimicrobial and antitumor N,N,N-trimethyl chitosan chloride/poly (acrylic acid)/silver nanocomposites. Int J Biol Macromol 2018; 111:706-716. [PMID: 29339279 DOI: 10.1016/j.ijbiomac.2018.01.055] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 11/27/2017] [Accepted: 01/09/2018] [Indexed: 12/17/2022]
Abstract
The present study is imported to solve two critical problems we face in our daily life which are microbial pollution and colon cancer. One pot green synthesis of a water soluble polyelectrolyte complex (PEC) between cationic polysaccharide as N,N,N-trimethyl chitosan chloride (TMC) and anionic polymer as poly (acrylic acid) (PAA) in presence of silver nanoparticles to yield (TMC/PAA/Ag) nanocomposites with different Ag weight ratios. Structure of TMC, PAA and TMC/PAA (PEC) were proved via different analysis tools. TMC/PAA and its Ag nanocomposites are used as antimicrobial agents against different pathogenic bacteria and fungi to solve microbial pollution. TMC/PAA-Silver nanocomposites had the highest antimicrobial activity which increases with increasing Ag %. Cytotoxicity data confirmed also that TMC/PAA/Ag (3%) had the most cytotoxic effect (the less cell viability %) towards colon cancer. TMC/PAA (PEC) was formed through electrostatic interactions between N-quaternized (-N+R3) groups in TMC and carboxylate (-COO-) groups in PAA.
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Affiliation(s)
| | - Riham R Mohamed
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt.
| | - Marwa M Abdel-Aziz
- The Regional Center for Mycology and Biotechnology, Azhar University, Cairo 11651, Egypt
| | - Magdy W Sabaa
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
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Elella MHA, Mohamed RR, ElHafeez EA, Sabaa MW. Synthesis of novel biodegradable antibacterial grafted xanthan gum. Carbohydr Polym 2017; 173:305-311. [DOI: 10.1016/j.carbpol.2017.05.058] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 05/05/2017] [Accepted: 05/18/2017] [Indexed: 11/26/2022]
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Mohamed RR, Elella MHA, Sabaa MW. Cytotoxicity and metal ions removal using antibacterial biodegradable hydrogels based on N-quaternized chitosan/poly(acrylic acid). Int J Biol Macromol 2017; 98:302-313. [PMID: 28130135 DOI: 10.1016/j.ijbiomac.2017.01.107] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 01/03/2017] [Accepted: 01/24/2017] [Indexed: 11/18/2022]
Abstract
Physically crosslinked hydrogels resulted from interaction between N,N,N-trimethyl chitosan chloride (N-Quaternized Chitosan) (NQC) and poly(acrylic acid) (PAA) were synthesized in different weight ratios (3:1), (1:1) and (1:3) taking the following codes Q3P1, Q1P1 and Q1P3, respectively. Characterization of the mentioned hydrogels was done using several analysis tools including; FTIR, XRD, SEM, TGA, biodegradation in simulated body fluid (SBF) and cytotoxicity against HepG-2 liver cancer cells. FTIR results proved that the prepared hydrogels were formed via electrostatic and H-bonding interactions, while XRD patterns proved that the prepared hydrogels -irrespective to their ratios- were more crystalline than both matrices NQC and PAA. TGA results, on the other hand, revealed that Q1P3 hydrogel was the most thermally stable compared to the other two hydrogels (Q3P1 and Q1P1). Biodegradation tests in SBF proved that these hydrogels were more biodegradable than the native chitosan. Examination of the prepared hydrogels for their potency in heavy metal ions removal revealed that they adsorbed Fe (III) and Cd (II) ions more than chitosan, while they adsorbed Cr (III), Ni (II) and Cu (II) ions less than chitosan. Moreover, testing the prepared hydrogels as antibacterial agents towards several Gram positive and Gram negative bacteria revealed their higher antibacterial activity as compared with NQC when used alone. Evaluating the cytotoxic effect of these hydrogels on an in vitro human liver cancer cell model (HepG-2) showed their good cytotoxic activity towards HepG-2. Moreover, the inhibition rate increased with increasing the hydrogels concentration in the culture medium.
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Affiliation(s)
- Riham R Mohamed
- Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt
| | | | - Magdy W Sabaa
- Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt.
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Sabaa MW, Abdallah HM, Mohamed NA, Mohamed RR. Synthesis, characterization and application of biodegradable crosslinked carboxymethyl chitosan/poly(vinyl alcohol) clay nanocomposites. Materials Science and Engineering: C 2015; 56:363-73. [DOI: 10.1016/j.msec.2015.06.043] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 05/09/2015] [Accepted: 06/22/2015] [Indexed: 10/23/2022]
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Mohamed RR, Elella MHA, Sabaa MW. Synthesis, characterization and applications of N- quaternized chitosan/poly(vinyl alcohol) hydrogels. Int J Biol Macromol 2015; 80:149-61. [DOI: 10.1016/j.ijbiomac.2015.06.041] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 06/17/2015] [Accepted: 06/20/2015] [Indexed: 11/28/2022]
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Mansour AM, Mohamed RR. Sulfamethazine copper(ii) complexes as antimicrobial thermal stabilizers and co-stabilizers for rigid PVC: spectroscopic, thermal, and DFT studies. RSC Adv 2015. [DOI: 10.1039/c4ra07212j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Binary and ternary Cu(ii) complexes of the sulfamethazine antibacterial drug have been prepared, characterized, and tested for their antibacterial thermal stabilizer efficiency for PVC.
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Affiliation(s)
- Ahmed M. Mansour
- Chemistry Department
- Faculty of Science
- Cairo University
- Giza 12613
- Egypt
| | - Riham R. Mohamed
- Chemistry Department
- Faculty of Science
- Cairo University
- Giza 12613
- Egypt
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Mohamed RR, Sabaa MW. Synthesis and characterization of antimicrobial crosslinked carboxymethyl chitosan nanoparticles loaded with silver. Int J Biol Macromol 2014; 69:95-9. [DOI: 10.1016/j.ijbiomac.2014.05.025] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 04/30/2014] [Accepted: 05/07/2014] [Indexed: 10/25/2022]
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Mohamed NA, Mohamed RR, Seoudi RS. Synthesis and characterization of some novel antimicrobial thiosemicarbazone O-carboxymethyl chitosan derivatives. Int J Biol Macromol 2013; 63:163-9. [PMID: 24211430 DOI: 10.1016/j.ijbiomac.2013.10.044] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Revised: 10/29/2013] [Accepted: 10/29/2013] [Indexed: 11/18/2022]
Abstract
Three novel thiosemicarbazone O-carboxymethyl chitosan derivatives were obtained via a condensation reaction of thiosemicarbazide O-carboxymethyl chitosan with o-hydroxybenzaldehyde, p-methoxybenzaldehyde, and p- chlorobenzaldehyde respectively. Their structures were characterized by elemental analysis, FTIR, (13)C NMR and X-ray diffraction. The antimicrobial behaviors of the prepared derivatives against three types of bacteria Staphylococcus aureus (S. aureus, RCMBA 2004), Bacillus subtilis (B. subtilis, RCMBA 6005), and Escherichia coli (E. Coli, RCMBA 5003) and three crops-threatening pathogenic fungi Aspergillus fumigatus (A. fumigatus, RCMBA 06002), Geotrichum candidum (G. candidum, RCMB 05098), and Candida albicans (C. albicans, RCMB 05035) were investigated. The results indicated that the antibacterial and antifungal activities of the investigated derivatives are much higher than those of the parent O-carboxymethyl chitosan. They were more potent in case of Gram-positive bacteria than Gram-negative bacteria. The presence of electron withdrawing chlorine atom on the aryl moiety of the aldehyde portion improved greatly antimicrobial activity to be nearly equivalent to the used standard drugs.
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Affiliation(s)
- Nadia A Mohamed
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt.
| | - Riham R Mohamed
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
| | - Rania S Seoudi
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
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Fahmy MM, Mohamed RR, Mohamed NA. Novel antimicrobial organic thermal stabilizer and co-stabilizer for rigid PVC. Molecules 2012; 17:7927-40. [PMID: 22751259 PMCID: PMC6268415 DOI: 10.3390/molecules17077927] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 06/15/2012] [Accepted: 06/18/2012] [Indexed: 11/15/2022] Open
Abstract
Biologically active N-benzoyl-4-(N-maleimido)-phenylhydrazide (BMPH) was synthesized and its structure was confirmed by elemental analysis and various spectral tools. It was examined as a thermal stabilizer and co-stabilizer for rigid poly (vinyl chloride) at 180 °C in air. Blending BMPH with reference samples in different ratios greatly lengthens the thermal stability value and improves the extent of discoloration of PVC. TGA confirmed the improved stability of PVC in presence of the investigated organic stabilizer. GPC measurements were done to investigate the changes occurred in the molecular masses of the degraded samples of blank PVC and PVC in presence of the novel stabilizer. BMPH showed good antimicrobial activity towards two kinds of bacteria and two kinds of fungi.
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El-Gamel NEA, Mohamed RR, Zayed MA. Synthesis, characterization and application of enrofloxacin complexes as thermal stabilizers for rigid poly(vinyl chloride). Dalton Trans 2012; 41:1824-31. [DOI: 10.1039/c1dt11928a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sabaa MW, Mohamed RR, Eltaweel SH, Seoudi RS. Crosslinked poly(vinyl alcohol)/carboxymethyl chitosan hydrogels for removal of metal ions and dyestuff from aqueous solutions. J Appl Polym Sci 2011. [DOI: 10.1002/app.35072] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Mohamed RR. WITHDRAWN: Synthesis and characterization of novel biodegradable adsorbents based on carboxy methylchitosan-calixarenes. Carbohydr Res 2011:S0008-6215(11)00086-3. [PMID: 21392737 DOI: 10.1016/j.carres.2011.02.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 02/09/2011] [Accepted: 02/11/2011] [Indexed: 11/21/2022]
Abstract
This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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Affiliation(s)
- Riham R Mohamed
- Cairo University, Faculty of Science, Chemistry Department, Giza 12613, Egypt
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Sabaa MW, Mohamed NA, Mohamed RR, Khalil NM, Abd El Latif SM. Synthesis, characterization and antimicrobial activity of poly (N-vinyl imidazole) grafted carboxymethyl chitosan. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2009.10.024] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Sabaa MW, Mohamed RR. Phenyl urea derivatives as organic stabilizers for rigid poly(vinyl chloride) against photo-degradation. J Appl Polym Sci 2006. [DOI: 10.1002/app.25205] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sabaa MW, Oraby EH, Naby ASA, Mohamed RR. N-phenyl-3-substituted 5-pyrazolone derivatives as organic stabilizers for rigid poly(vinyl chloride) against photodegradation. J Appl Polym Sci 2006. [DOI: 10.1002/app.23402] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sabaa MW, Oraby EH, Abdel Naby AS, Mohamed RR. Anthraquinone derivatives as organic stabilizers for rigid poly(vinyl chloride) against photo-degradation. Eur Polym J 2005. [DOI: 10.1016/j.eurpolymj.2005.05.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sabaa MW, Mohamed RR, Yassin AA. Organic thermal stabilizers for rigid poly(vinyl chloride).Part X: N-acryloyl-N′-p-substituted phenylthiourea derivatives. Polym Degrad Stab 2003. [DOI: 10.1016/s0141-3910(03)00175-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sabaa MW, Mohamed RR, Yassin AA. Organic thermal stabilizers for rigid poly(vinyl chloride) VIII. Phenylurea and phenylthiourea derivatives. Polym Degrad Stab 2003. [DOI: 10.1016/s0141-3910(03)00060-0] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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