Article
Chemistry, Physical
Shraddha Pai, Srinivas M. Kini, Manoj Kumar Narasimhan, Arivalagan Pugazhendhi, Raja Selvaraj
Summary: In this study, Fe3O4 nanoparticles were successfully prepared using Thunbergia grandifiora leaf extract, with high specific surface area and mesoporous structure. The nanoparticles showed a high adsorption capacity and efficiency for Acid blue 113 dye removal.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Environmental
Tariq J. Al-Musawi, Nezamaddin Mengelizadeh, Orabi Al Rawi, Davoud Balarak
Summary: The magnetized chitosan polymer C-Fe2O3 efficiently adsorbed acid blue 113 dye from aqueous solution, achieving a removal efficiency of 99.68% under optimized conditions. The material showed excellent recyclability with only a slight loss in efficiency after multiple operational cycles.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Environmental Sciences
Swetha Sunkar, P. Prakash, Balaji Dhandapani, Omirserik Baigenzhenov, J. Aravind Kumar, Valli Nachiyaar, Sara Zolfaghari, Ahmad Sara, Tejaswini, Ahmad Hosseini-Bandegharaei
Summary: This study compared the effectiveness of three biowaste materials in removing acid blue dye 113 from wastewater. The newly synthesized sorbent material, carbonized H3PO4-activated corn leaf, was found to have superior adsorption capacity and suitability for removing toxic dyes from contaminated waters. The characteristics of the sorbent materials were also studied, and the influence of experimental conditions was evaluated.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Shraddha Pai, M. Srinivas Kini, Gayathri Rangasamy, Raja Selvaraj
Summary: Calcium hydroxide nanoadsorbent derived from waste bivalve clamshells was found to have a high monolayer adsorption capacity for Acid Blue 113 dye. Langmuir and Temkin isotherms showed good fit to the experimental data, while pseudo-second-order kinetics described the adsorption rate well. Thermodynamic study revealed spontaneous and exothermic adsorption. This study demonstrated the effectiveness of using calcium hydroxide as an adsorbent for removing Acid Blue 113 dye from aqueous solutions.
Article
Environmental Sciences
Anitha Thulasisingh, Seenuvasan Muthulingam, Mohan Kumar, Naveenraj Rajasekar, Shantanu Mohanraj, Carlin Geor Malar
Summary: Biosorption using a chitosan-pectinase blend (CPB) was studied for the removal of methylene blue (MB) dye from synthetic solutions. The blend showed a rough surface morphology and amorphous nature. Fourier-transform infrared (FTIR) analysis confirmed the successful blend formation. Maximum adsorption was achieved at pH 7.0, 30°C, 30 min contact time, and an adsorbent dosage of 2.5 g/L. The pseudo-second-order model provided the best fit, with the highest R2 value close to 1. The Temkin isotherm model showed the highest adsorption capacity at 16.81 mg/g. The blend demonstrated good desorption ability, allowing for reuse in dye removal.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Polymer Science
Nouf Faisal Alharby, Ruwayda S. Almutairi, Nadia A. Mohamed
Summary: The chemical cross-linking of carboxymethyl chitosan was used to obtain a novel hydrogel for efficient removal of Methylene Blue dye from aqueous solution. Factors such as temperature and pH were found to significantly impact the adsorption capacity of the hydrogel, with higher temperatures and pH values leading to increased adsorption. The pseudo-second-order mechanism was found to be predominant in the adsorption process, with the Langmuir model showing high applicability.
Article
Chemistry, Applied
Malgorzata M. Jaworska, Urszula Filipkowska, Zofia Modrzejewska
Summary: The study investigated the functional groups involved in the sorption of premetalized dye Acid Blue 158:Cr on chitin/chitosan, revealing that physical sorption and chemisorption can occur simultaneously.
CARBOHYDRATE POLYMERS
(2022)
Article
Polymer Science
Dovile Liudvinaviciute, Ramune Rutkaite, Joana Bendoraitiene, Rima Klimaviciute, Greta Zambzickaite
Summary: The adsorption behavior of CA on CH powder was studied, revealing that with increasing adsorption temperature, the rate of adsorption increased while the amount of adsorbed CA decreased. The Langmuir adsorption model predicted that CA mainly adsorbed on the ionized amino groups of CH.
Article
Biochemistry & Molecular Biology
Zakariyya Uba Zango, John Ojur Dennis, A. Aljameel, Fahad Usman, Mohammed Khalil Mohammed Ali, Bashir Abubakar Abdulkadir, Saja Algessair, Osamah A. Aldaghri, Khalid Hassan Ibnaouf
Summary: In this study, ZnO-chitosan nanocomposites were successfully synthesized for the removal of methylene blue from water. The nanocomposites showed remarkable performance in dye adsorption and exhibited good reusability.
Article
Chemistry, Physical
Yun Liu, Yue-Fei Zhang, Jian Tang, Yuting Tan, Hang Lei, Ying Li, Pengmian Huang, Yan Li
Summary: In this study, a novel chitosan-based adsorbent with low cost, high adsorption capacity, and excellent reusability was developed. The adsorbent showed high swelling ratio and ultrahigh adsorption capacity for the anion dye acid blue 93, with a good stability and reusability even after multiple adsorption-desorption cycles. These findings provide a new option for the elimination and recycle of AB93, with potential for industrial applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Multidisciplinary Sciences
Hassanien Gomaa, Eman M. Abd El-Monaem, Abdelazeem S. Eltaweil, Ahmed M. Omer
Summary: This study fabricated a montmorillonite/magnetic -NiFe2O4@amine-functionalized chitosan (MMT-mAmCs) composite as a green adsorbent for the removal of cationic methylene blue and crystal violet dyes from wastewater. The MMT-mAmCs composite exhibited high negative charges over a wide pH range, making it ideal for adsorbing cationic contaminants. The optimum pH for adsorption was found to be 7, and the composite displayed ferromagnetic behavior for easy separation. The maximum adsorption capacities of methylene blue and crystal violet were 137 and 118 mg/g, respectively, and the composite showed excellent reusability with over 87% removal efficiency after ten cycles.
SCIENTIFIC REPORTS
(2022)
Article
Biochemistry & Molecular Biology
Sivarama Krishna Lakkaboyana, Khantong Soontarapa, Vinaykumar, Ravi Kumar Marella, Karthik Kannan
Summary: A novel sustainable chitosan polymeric nanocomposite CS-PVA@CuO was synthesized for the removal of acid blue 25 (AB25) from water. The study found that CS-PVA@CuO has a high adsorption capacity and can be used as an effective adsorbent.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Biochemistry & Molecular Biology
Fatma H. A. Mustafa, Ebtsam Kh. M. Gad ElRab, Rasha M. Kamel, Reda F. M. Elshaarawy
Summary: Chitosan/aspartic acid hydrogels were synthesized for the removal of MB dye from textile aqueous effluents. The hydrogels were characterized and confirmed to have successful preparations and MB dye adsorption. Batch experiments were conducted to investigate the effects of various factors on the adsorption process. The optimized conditions were determined for each hydrogel. The adsorption capacities of the hydrogels were compared, and both followed Freundlich isotherm model and pseudo-second-order kinetics for adsorption.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Physical
Islam M. Minisy, Nehal A. Salahuddin, Mohamad M. Ayad
Summary: In this study, an eco-friendly adsorbent of chitosan-montmorillonite/polyaniline nanocomposite was synthesized and used for methylene blue removal from aqueous solutions. The polyaniline base composite proved to be a better dye adsorbent and exhibited a maximum adsorption capacity of 111 mg g-1.
APPLIED CLAY SCIENCE
(2021)
Article
Chemistry, Applied
Yuru Yang, Lei Zeng, Zongkun Lin, Huabin Jiang, Aiping Zhang
Summary: A chitosan-based bead was synthesized by crosslinking and sulfhydryl modification reaction, with good removal ability for heavy metal ions Pb2+, Cu2+, and Cd2+. The adsorption process of the beads fits the Langmuir isotherm model and pseudo second-order kinetics model.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Applied
Antonia Carla de Jesus Oliveira, Luise Lopes Chaves, Fabio de Oliveira Silva Ribeiro, Lais Ramos Monteiro de Lima, Thaisa Cardoso Oliveira, Fatima Garcia-Villen, Cesar Viseras, Regina C. M. de Paula, Pedro Jose Rolim-Neto, Fernando Hallwass, Edson C. Silva-Filho, Durcilene Alves da Silva, Jose Lamartine Soares-Sobrinho, Monica Felts de la Roca Soares
Summary: Chemical modification of polysaccharides using microwave irradiation for the synthesis of phthalated cashew gum was investigated in this study, showing promising properties for improving the treatment of Chagas disease. The modified biopolymers were characterized for their structural and physicochemical properties, and the nanoparticles used for drug delivery systems exhibited specific characteristics such as size, zeta potential, and in vitro release behavior.
CARBOHYDRATE POLYMERS
(2021)
Article
Cell Biology
Rodolfo de Melo Nunes, Virginia Claudia Carneiro Girao, Rondinelle Ribeiro Castro, Pablyana Leila Rodrigues Cunha, Judith Pessoa Andrade Feitosa, Ana Carolina Matias Dinelly Pinto, Francisco Airton Castro Rocha
Summary: The relative content of CS in the cartilage matrix from both experimental and human OA samples increased, distinguishing OA extracellular CS from normal cartilage by an increase in peak MM.
CONNECTIVE TISSUE RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Lais Ramos Monteiro Lima, Everton Lucas de Lima Ramos, Maria Francilene Souza Silva, Fabio de Oliveira Silva Ribeiro, Jeanlex S. Sousa, Claudia Pessoa, Durcilene Alves Silva, Judith P. A. Feitosa, Haroldo C. B. Paula, Regina Celia Monteiro de Paula
Summary: In this study, aminated poly(N-isopropylacrylamide) was successfully grafted onto oxidized galactomannan polysaccharide from Delonix regia via Schiff base reaction. The self-organizing ability of the obtained nanoparticle copolymers was investigated, showing promising potential for drug delivery with good cell viability and transition temperature close to human body temperature. The use of free aldehyde groups in the oxidized polysaccharide for pro-drug formation with substances possessing NH2 groups was also highlighted.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Biochemistry & Molecular Biology
Irisvan S. Ribeiro, Francisco J. G. Pontes, Maria J. M. Carneiro, Nayara A. Sousa, Vicente P. T. Pinto, Fabio O. S. Ribeiro, Durcilene A. Silva, Gisele S. Araujo, Jose D. B. Marinho Filho, Ana J. Araujo, Haroldo C. B. Paula, Judith P. A. Feitosa, Regina C. M. de Paula
Summary: Polymer-based nanoparticles prepared in this study showed excellent drug encapsulation, controlled release performance, and biocompatibility, making them promising for drug delivery applications.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Biochemistry & Molecular Biology
Maria J. M. Carneiro, Claudio B. A. Paula, Irisvan S. Ribeiro, Lais R. M. de Lima, Fabio O. S. Ribeiro, Durcilene A. Silva, Gisele S. Araujo, Jose D. B. Marinho Filho, Ana J. Araujo, Rosemayre S. Freire, Judith P. A. Feitosa, Regina C. M. de Paula
Summary: Stimulus-responsive nanoparticles with dextran-graft-poly (N-isopropylacrylamide) copolymers synthesized via Schiff base formation show thermal and pH dual responsiveness. Conjugation of doxorubicin to the copolymers results in nanoparticles that exhibit selective release of the drug in tumor cells, demonstrating high cytotoxicity against cancer cells and low toxicity towards non-tumor cells.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Biochemistry & Molecular Biology
Thaisa Cardoso de Oliveira, Antonia Carla de Jesus Oliveira, Yuri Basilio Gomes Patriota, Luise Lopes Chaves, Fabio de Oliveira Silva Ribeiro, Regina C. M. de Paula, Edson Cavalcanti Silva-Filho, Durcilene Alves da Silva, Monica Felts de La Roca Soares, Jose Lamartine Soares-Sobrinho
Summary: A new hydrophobic polymer based on angico gum (AG) was developed, and new nanoparticles were produced to expand the applications of natural polysaccharides in nanomedicine. By utilizing Plackett-Burman's experimental design, nanoparticles with different characteristics were successfully produced. NVP-loaded PAG nanoparticles showed significant promotion of drug release.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Chemistry, Multidisciplinary
Gabriel Perli, Diego L. Bertuzzi, Denio E. P. Souto, Miguel D. Ramos, Carolyne B. Braga, Samile B. Aguiar, Catia Ornelas
Summary: Dendronized gold nanoparticles with charged peripheral groups were successfully synthesized and characterized. The results showed that these nanoparticles have stability and functionalization potential, which could be used as weapons against multi-drug resistant bacterial infections.
Article
Chemistry, Physical
Maria K. S. O. Abreu, Maria A. S. Silva, Dieric S. Abreu, Ana R. Richter, Regina C. M. de Paula, Vera R. L. Constantino, Igor F. Vasconcelos, Francisco G. S. de Oliveira, Acacio S. de Melo, Marcio A. Correa, Izaura C. N. Diogenes
Summary: This study improves the colloidal stability of CoFe2O4 in water media by encapsulating it in CMCG. The results show that after encapsulation, CoFe2O4 forms a polymer-caged MNPs aggregate with a negatively charged layer. Despite the dilution effect of CMCG, the material maintains magnetization.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Biochemistry & Molecular Biology
Fabio de Oliveira Silva Ribeiro, Fatima de Cassia Evangelista de Oliveira, Claudia Pessoa, Jhones do Nascimento Dias, Patricia Albuquerque, Edymilais da Silva Sousa, Sidney Goncalo de Lima, Lais Ramos Monteiro de Lima, Venicios G. Sombra, Regina Celia Monteiro de Paula, Even Herlany Pereira Alves, Daniel Fernando Pereira Vasconcelos, Darllan Damasceno Fontenele, Bruno Iles, Jand Venes Rolim Medeiros, Alyne Rodrigues de Araujo, Durcilene Alves da Silva, Jose Roberto de Souza de Almeida Leite
Summary: Lemon gum (LG) was isolated and characterized from Citrus x latifolia in Brazil. The biocompatibility of LG was evaluated in vitro and in vivo, and it showed antiproliferative activity against human prostate adenocarcinoma cancer cells. The results indicate the potential of LG for biomedical and biotechnological applications.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Oncology
Raimundo Fernandes de Araujo Junior, George A. Lira, Timo Schomann, Romulo S. Cavalcante, Natalia Feitosa Vilar, Regina Celia Monteiro de Paula, Raelle Ferreira Gomes, Chih Kit Chung, Carla Jorquera-Cordero, Olena Vepris, Alan B. Chan, Luis J. Cruz
Summary: This study investigates the down-regulation of interaction between tumour-associated macrophages (TAMs) and colorectal cancer cells by nanoparticles (NPs) loaded with retinoic acid (RA) and coated with cholesterol (CHO), in combination with an anti-PD-L1 immune checkpoint inhibitor. The IL-10R/IL-10 axis is shown to overstimulate the STAT3 pathway and downregulate the NF-kappa B signalling pathway, leading to immunosuppression and epithelial-mesenchymal-transition of colorectal cancer. The use of RA-loaded NPs coated with CHO and anti-PD-L1 is found to be more effective in blocking this signalling pathway.
TRANSLATIONAL ONCOLOGY
(2023)
Article
Polymer Science
Francisco das C. M. Brito, Wilton C. Lopes, Fabio O. S. Ribeiro, Raiza Raianne Luz Rodrigues, Klinger Antonio da Franca Rodrigues, Fabricio dos Santos Machado, Ana Jersia Araujo, Jose Delano Barreto Marinho Filho, Antonia Carla J. Oliveira, Edson C. S. Filho, Irisvan S. Ribeiro, Regina C. M. de Paula, Fernando Hallwass, Vicente Galber F. Viana, Durcilene A. Silva
Summary: This study modified the cashew gum through an amine reaction, which changed its molecular weight and surface charge. The amine group binding to the gum was confirmed, and cytotoxicity tests showed that the modified gum had increased thermal stability and no cytotoxic potential at concentrations below 50.0 mg/L.
Article
Chemistry, Multidisciplinary
Aline T. dos Santos, Emerson L. da Silva, Raquel C. Montenegro, Jeanlex S. de Sousa, Regina C. M. de Paula, Judith P. A. Feitosa
Summary: Copolymers of N-isopropylacrylamide (NIPAm) grafted with Dextran sulfate (DS) hold great potential for drug release, especially in targeted delivery to inflamed regions. Two different ratios of the copolymers were synthesized and confirmed using spectroscopic techniques. These copolymers demonstrated self-organization behavior in aqueous medium at temperatures above 34°C, with sizes smaller than 300 nm and spherical shapes. DS-g-3PNIPAm showed specificity to leukemic cells without affecting normal cell proliferation. Encapsulating and delivering the poorly water-soluble drug MTX using DS-g-3PNIPAm can overcome its severe side effects and improve bioactivity and stability. Among the thermo-responsive copolymers and targeted MTX nanocarriers, the DS-g-PNIPam exhibited the best performance.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Ana R. Richter, Jose G. Veras-Neto, Jeanlex S. Sousa, Josilayne F. S. Mendes, Raquel O. S. Fontenelle, Stephanie A. N. M. Silva, Jose D. B. Marinho-Filho, Ana J. Araujo, Judith P. A. Feitosa, Haroldo C. B. Paula, Francisco M. Goycoolea, Regina C. M. de Paula
Summary: This study reports the effect of acyl chain length on hydrophobized cashew gum derivatives. By using different anhydrides, the properties of nanoparticles and drug delivery were investigated, resulting in nanoparticles with desirable properties.
COLLOIDS AND INTERFACES
(2022)
Article
Chemistry, Applied
Lais R. M. Lima, Clara M. W. S. A. Cavalcante, Maria J. M. Carneiro, Josilayne F. S. Mendes, Nayara A. Sousa, Rosimeyre S. Freire, Vicente P. T. Pinto, Raquel O. S. Fontenelle, Judith P. A. Feitosa, Regina C. M. de Paula
Summary: Thermo-responsive copolymers were synthesized for loading galactomannan and antifungal drug amphotericin-B, showing good hemocompatibility and controlled release profile. The copolymer nanoparticles demonstrated effective antifungal activity with improved hemocompatibility compared to commercial amphotericin-B.
CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS
(2021)
Article
Polymer Science
Carlos Pinheiro Chagas de Lima, Andreia Hansen Oster, Fabio Rossi Cavalcanti, Regina Celia Monteiro de Paula, Judith Pessoa Andrade Feitosa
Summary: The study showed that sulfated chicha gum (SCHG) can act as an effective elicitor, enhancing the activity of guaiacol peroxidase and polyphenol oxidases while increasing the lignin content in apple fruits. Plant exudate may serve as an abundant, renewable, and safe source of elicitors.
POLIMEROS-CIENCIA E TECNOLOGIA
(2021)
Article
Chemistry, Applied
Xiaodan Wu, Zihan Wang, Guansong Shao, Bingyang Qin, Ying Wang, Tao Wang, Zhiguo Liu, Yujie Fu
Summary: In this study, a new type of cellulose-based ionic imprinting adsorbent was developed for the selective removal of cobalt ions. The adsorbent exhibited excellent adsorption performance, high cycling stability, and preferential selectivity for cobalt ions. The simple preparation method and promising application prospects make it a promising candidate for water treatment.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Chandirasekar Shanmugam, Vanitha Marimuthu, Nagappan Rajendiran
Summary: In this study, monodispersed gold and silver nanoparticles were synthesized using cholic acid functionalized star poly(DL-lactide) as a capping and reducing agent. The synthesized materials were found to be effective heterogeneous catalysts for the reduction reaction.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Bianca-Iulia Ciubotaru, Mirela-Fernanda Zaltariov, Mihaela Dascalu, Adrian Bele, Alexandra Bargan, Maria Cazacu
Summary: Porous networks were obtained using polysiloxanes pendant functionalized with aminopropyl groups. The addition of certain substances, such as ammonium bicarbonate and acetic acid, promoted the porosity and covalent cross-linking of the polymer. The resulting materials exhibited high dielectric permittivity and significant electrical output signal when subjected to compression, making them suitable for capacitive pressure sensors.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Mohamed A. Zein, Basim H. Asghar, Abdulaziz M. Almohyawi, Norah F. Alqahtani, Ahmed Alharbi, J. Alkabli, Reda F. M. Elshaarawy, Lamia A. Ismail
Summary: In this study, new amphiphilic chitosan-thyme extract-nanosilver nanocomposites were prepared, which synergistically inhibited bacterial biofilm formation and bacterial proliferation. The nanocomposites disrupted bacterial cell membranes, causing cell death, and prevented biofilm formation. In addition, the nanocomposites exhibited good biocompatibility, making them potential candidates for biomedical applications.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Review
Chemistry, Applied
Norah F. Alqahtani
Summary: This review explores the potential of Imidazolium-based ionic liquids (ImILs) in improving the solubility, stability, and functionality of chitosan, and provides an overview of the types and preparation methods of functionalized imidazolium ionic liquids (FImILs). Additionally, it discusses the various opportunities offered by FImIL-chitosan derivatives.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Olesya N. Zabegaeva, Alexey F. Kosolapov, Sergei L. Semjonov, Mariam G. Ezernitskaya, Egor S. Afanasyev, Ivan A. Godovikov, Alexander Chuchalov, Dmitriy A. Sapozhnikov
Summary: Polyimides are commonly used as primary protective coatings for optical fibers in high-temperature applications. However, the manufacturing process is complicated due to certain drawbacks. This study shows the potential use of polyamide-imides as highly reliable protective coatings for optical fibers.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
Article
Chemistry, Applied
Luis Miguel Nunez Tapia, Pascal Thebault, Laurent Bischoff, Alain Ledoux, Florian Defontaine, Olivier Lesouhaitier, Fabrice Burel
Summary: A water soluble cationic bis-cyclocarbonate was prepared through a three steps procedure, and non-isocyanate polyurethanes were prepared in acetonitrile with high yields. The resulting materials exhibited good thermal properties and hydrophilic properties. The polyurethane thermoset showed high inhibition towards bacteria, and the bis-cyclocarbonate oligomer was found to be harmless to organisms.
REACTIVE & FUNCTIONAL POLYMERS
(2024)
