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Geyik G, Güncüm E, Işıklan N. Design and development of pH-responsive alginate-based nanogel carriers for etoposide delivery. Int J Biol Macromol 2023; 250:126242. [PMID: 37562484 DOI: 10.1016/j.ijbiomac.2023.126242] [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: 02/16/2023] [Revised: 07/30/2023] [Accepted: 08/07/2023] [Indexed: 08/12/2023]
Abstract
Recently, pH-responsive nanogels are playing progressively important roles in cancer treatment. The present study focuses on designing and developing pH-responsive alginate-based nanogels to achieve a controlled release of etoposide (Et) while enhancing its hydrophilicity. Alginate (ALG) is grafted with 2-hydroxypropyl methacrylamide (HPMA) through a microwave-supported method, and the chemical structure of the graft copolymer (ALG-g-PHPMA) was verified by 1H/13C NMR and FTIR techniques. The ALG-g-PHPMA and anticancer drug-loaded ALG-g-PHPMA@Et nanogels were obtained using an emulsion method, and their structures were characterized through FTIR, TG/DSC, AFM/TEM, BET, and DLS analyses. The ALG-g-PHPMA nanogels demonstrated a good drug encapsulation efficiency (79.60 %), displaying a pH-dependent release profile and an in vitro accelerated release of Et compared to the ALG nanogels. Thermal and BET analyses revealed enhanced stability, surface area, and porosity volume of the alginate nanogels. The grafting of PHPMA chains onto alginate altered the surface topology of the ALG nanogels, resulting in lower surface roughness. Furthermore, cytotoxicity tests showed the high biocompatibility of the ALG-g-PHPMA copolymer and its nanogels. The ALG-g-PHPMA@Et nanogels exhibited a higher anticancer effect on lung cancer (H1299) cells than free etoposide. These results suggest that the ALG-g-PHPMA nanogels can be applied as a pH-dependent nanoplatform for delivering anticancer drugs.
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Affiliation(s)
- Gülcan Geyik
- Department of Chemistry, Faculty of Arts and Sciences, Kırıkkale University, Yahşihan, 71450 Kırıkkale, Turkey; Alaca Avni Çelik Vocational School, Hitit University, Çorum, Turkey
| | - Enes Güncüm
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Kırıkkale University, 71450 Yahşihan, Kırıkkale, Turkey
| | - Nuran Işıklan
- Department of Chemistry, Faculty of Arts and Sciences, Kırıkkale University, Yahşihan, 71450 Kırıkkale, Turkey.
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2
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Xiao Q, Chen Z, Ma M, Xie X, Weng H, Zhang Y, Chen J, Xiao A. Synthesis, characterization, antibacterial and emulsifying properties of agar benzoate. Int J Biol Macromol 2023; 239:124254. [PMID: 37003393 DOI: 10.1016/j.ijbiomac.2023.124254] [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: 09/22/2022] [Revised: 01/15/2023] [Accepted: 03/27/2023] [Indexed: 04/03/2023]
Abstract
Agar benzoate (AB) with different degrees of substitution (DS) was synthesized by the esterification of agar and benzoic anhydride in aqueous solution. The DS could be regulated by adjusting composition ratio, pH, and temperature. Its chemical structure was determined by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy (NMR). 13C NMR spectrum of the AB suggested the main substitution occurred at the C-6 in the d-galactopyranose. Cryo-scanning electron microscopy (Cryo-SEM) showed that the aperture of AB was larger than that of agar. The thermal performance of AB decreased slightly, but this did not affect its performance. AB showed the highest relative antibacterial activity against Escherichia coli, S. aureus and Alternaria alternata, reaching 100 % (AB 20 g/L), 100 % (AB 40 g/L) and 19.35 % (7 d incubation), respectively. Moreover, the obtained AB possessed good emulsion stability. These antibacterial AB have broad application prospects in the field of fruit and vegetable preservation.
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Affiliation(s)
- Qiong Xiao
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; National R&D Center for Red Alga Processing Technology, Xiamen, Fujian Province 361021, China; Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Xiamen, Fujian Province 361021, China; Xiamen Key Laboratory of Marine Functional Food, Xiamen 361021, China
| | - Zizhou Chen
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; National R&D Center for Red Alga Processing Technology, Xiamen, Fujian Province 361021, China; Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Xiamen, Fujian Province 361021, China; Xiamen Key Laboratory of Marine Functional Food, Xiamen 361021, China
| | - Mingze Ma
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; National R&D Center for Red Alga Processing Technology, Xiamen, Fujian Province 361021, China; Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Xiamen, Fujian Province 361021, China; Xiamen Key Laboratory of Marine Functional Food, Xiamen 361021, China
| | - Xiangji Xie
- Sanming Inspection & Testing Center for Product Quality, Sanming 365000, China
| | - Huifen Weng
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; National R&D Center for Red Alga Processing Technology, Xiamen, Fujian Province 361021, China; Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Xiamen, Fujian Province 361021, China; Xiamen Key Laboratory of Marine Functional Food, Xiamen 361021, China
| | - Yonghui Zhang
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; National R&D Center for Red Alga Processing Technology, Xiamen, Fujian Province 361021, China; Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Xiamen, Fujian Province 361021, China; Xiamen Key Laboratory of Marine Functional Food, Xiamen 361021, China
| | - Jun Chen
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; National R&D Center for Red Alga Processing Technology, Xiamen, Fujian Province 361021, China; Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Xiamen, Fujian Province 361021, China; Xiamen Key Laboratory of Marine Functional Food, Xiamen 361021, China.
| | - Anfeng Xiao
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China; National R&D Center for Red Alga Processing Technology, Xiamen, Fujian Province 361021, China; Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Xiamen, Fujian Province 361021, China; Xiamen Key Laboratory of Marine Functional Food, Xiamen 361021, China.
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3
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Geyik G, Işıklan N. Chemical modification of κ-carrageenan with poly(2-hydroxypropylmethacrylamide) through microwave induced graft copolymerization: Characterization and swelling features. Int J Biol Macromol 2023; 235:123888. [PMID: 36870636 DOI: 10.1016/j.ijbiomac.2023.123888] [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: 12/01/2022] [Revised: 02/24/2023] [Accepted: 02/26/2023] [Indexed: 03/06/2023]
Abstract
In the last decade, interest in the development of new graft copolymers based on natural polysaccharides has grown remarkably due to their potential applications in the wastewater treatment, biomedical, nanomedicine, and pharmaceutical fields. Herein, a novel graft copolymer of κ-carrageenan with poly(2-hydroxypropylmethacrylamide) (κ-Crg-g-PHPMA) was synthesized using a 'microwave induced' technique. The synthesized novel graft copolymer has been well characterized in terms of FTIR, 13C NMR, molecular weight determination, TG, DSC, XRD, SEM, and elemental analyses, taking κ-carrageenan as a reference. The graft copolymers' swelling characteristics were investigated at pH 1.2 and 7.4. The results of swelling studies displayed that the incorporation of PHPMA groups on κ-Crg provides increasing hydrophilicity. The effect of PHPMA percentage in the graft copolymers and pH of the medium on the swelling percentage was studied and the findings exhibited that swelling ability increased with the increment in PHPMA percentage and pH of the medium. The best swelling percentage was attained at pH = 7.4 and a grafting percentage of 81 % reaching 1007 % at the end of 240 min. Moreover, cytotoxicity of the synthesized κ-Crg-g-PHPMA copolymer was assessed on the L929 fibroblast cell line and obtained to be non-toxic.
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Affiliation(s)
- Gülcan Geyik
- Department of Chemistry, Faculty of Arts and Sciences, Kırıkkale University, Yahşihan 71450, Kırıkkale, Turkey; Alaca Avni Çelik Vocational School, Hitit University, Çorum, Turkey
| | - Nuran Işıklan
- Department of Chemistry, Faculty of Arts and Sciences, Kırıkkale University, Yahşihan 71450, Kırıkkale, Turkey.
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4
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Zhang B, Lan W, Xie J. Chemical modifications in the structure of marine polysaccharide as serviceable food processing and preservation assistant: A review. Int J Biol Macromol 2022; 223:1539-1555. [PMID: 36370860 DOI: 10.1016/j.ijbiomac.2022.11.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 10/24/2022] [Accepted: 11/04/2022] [Indexed: 11/11/2022]
Abstract
Marine polysaccharides are a kind of natural polysaccharides which isolated and extracted from marine organisms. Now some marine polysaccharides, such as chitosan, sodium alginate and agar, have been proven to exhibit antibacterial, antioxidant functions and biocompatibility, which are often used to preserve food or improve the physicochemical properties of food. However, they still have the defects of unsatisfactory preservation effect and biological activity, which can be remedied by its modification. Chemical modification is the most effective of all modification methods. The advances in common chemical modification methods of chitosan, sodium alginate, agar and other marine polysaccharides and research progress of modified products in food processing and preservation were summarized, and the influence of additional reaction conditions on the existence of chemical modification sites of polysaccharides was discussed. The modification of functional groups in natural marine polysaccharides leads to the change of molecular structure, which can improve the physical, chemical and biological properties of marine polysaccharides. Chemically modified products have been used in various fields of food applications, such as food preservatives, food additives, food packaging, and food processing aids. In general, chemical modification has excellent potential for food processing and preservation, which can improve the function of marine polysaccharides.
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Affiliation(s)
- Bingjie Zhang
- College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
| | - Weiqing Lan
- College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China; Shanghai Aquatic Products Processing and Storage Engineering Technology Research Center, Shanghai 201306, China; National Experimental Teaching Demonstration Center for Food Science and Engineering, Shanghai Ocean University, Shanghai 201306, China.
| | - Jing Xie
- College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China; Shanghai Aquatic Products Processing and Storage Engineering Technology Research Center, Shanghai 201306, China; National Experimental Teaching Demonstration Center for Food Science and Engineering, Shanghai Ocean University, Shanghai 201306, China.
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5
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Voycheva C, Slavkova M, Popova T, Tzankova D, Tosheva A, Aluani D, Tzankova V, Ivanova I, Tzankov S, Spassova I, Kovacheva D, Tzankov B. Synthesis and characterization of PnVCL grafted agar with potential temperature-sensitive delivery of Doxorubicin. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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6
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Singh S, Pandey JP, Sen G. Microwave assisted synthesis of guar gum based biopolymeric macromolecule optimized as a flocculant for mineral ore processing. Int J Biol Macromol 2022; 220:307-315. [PMID: 35961561 DOI: 10.1016/j.ijbiomac.2022.08.042] [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: 07/15/2022] [Revised: 08/03/2022] [Accepted: 08/07/2022] [Indexed: 11/17/2022]
Abstract
The research endeavour to synthesize a novel, non-toxic, eco-friendly guar gum based biopolymeric macromolecule, [2-(methacryloyloxy) ethyl] trimethyl ammonium chloride grafted guar gum (GG-g-P (MAETMAC)) that has been optimized as a flocculant for mineral ore processing. The synthesis was performed using non-radiation and microwave assisted technique to compare and ensure the superiority of the latter. The intended grafting of monomer[2-(methacryloyloxy) ethyl] trimethyl ammonium chloride on to the biological macromolecule (guar gum) was confirmed through standard physico-chemical characterization techniques namely X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-visible) spectroscopy, intrinsic viscosity study, etc. The flocculation efficacy of the synthesized novel graft copolymer was thoroughly investigated in kaolin, coal fine, and iron ore suspensions. We have explored a graft copolymer, [2-(methacryloyloxy) ethyl] trimethyl ammonium chloride grafted guar gum that has not been studied yet to the best of our knowledge. To establish the superiority of the synthesized biomaterial, the flocculation study revealed that the best grade of the synthesized novel graft copolymer showed flocculation efficacy of 90 % in kaolin, 69 % in Iron ore, and 29 % in coal fine suspensions which was significantly higher than using alum as a coagulant which provided 36 % efficacy in kaolin, 29 % in iron ore and 10 % in coal fine suspensions.
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Affiliation(s)
- Smita Singh
- Department of Chemistry, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India
| | - J P Pandey
- Department of Chemistry, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India
| | - Gautam Sen
- Department of Chemistry, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India.
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7
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Kumari N, Mishra S. Synthesis, characterization and flocculation efficiency of grafted Moringa gum based derivatives. Carbohydr Polym 2022; 281:119079. [DOI: 10.1016/j.carbpol.2021.119079] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Revised: 12/25/2021] [Accepted: 12/28/2021] [Indexed: 11/28/2022]
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8
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Park SH, Lee CR, Hong SK. Implications of agar and agarase in industrial applications of sustainable marine biomass. Appl Microbiol Biotechnol 2020; 104:2815-2832. [PMID: 32036436 DOI: 10.1007/s00253-020-10412-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 01/17/2020] [Accepted: 01/23/2020] [Indexed: 12/20/2022]
Abstract
Agar, a major component of the cell wall of red algae, is an interesting heteropolysaccharide containing an unusual sugar, 3,6-anhydro-L-galactose. It is widely used as a valuable material in various industrial and experimental applications due to its characteristic gelling and stabilizing properties. Agar-derived oligosaccharides or mono-sugars produced by various agarases have become a promising subject for research owing to their unique biological activities, including anti-obesity, anti-diabetic, immunomodulatory, anti-tumor, antioxidant, skin-whitening, skin-moisturizing, anti-fatigue, and anti-cariogenic activities. Agar is also considered as an alternative sustainable source of biomass for chemical feedstock and biofuel production to substitute for the fossil resource. In this review, we summarize various biochemically characterized agarases, which are useful for industrial applications, such as neoagarooligosaccharide or agarooligosaccharide production and saccharification of agar. Additionally, we succinctly discuss various recent studies that have been conducted to investigate the versatile biological activities of agar-derived saccharides and biofuel production from agar biomass. This review provides a basic framework for understanding the importance of agarases and agar-derived saccharides with broad applications in pharmaceutical, cosmetic, food, and bioenergy industries.
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Affiliation(s)
- Si Hyoung Park
- Department of Biological Sciences, Myongji University, Yongin, Gyeonggido, 17058, Republic of Korea
| | - Chang-Ro Lee
- Department of Biological Sciences, Myongji University, Yongin, Gyeonggido, 17058, Republic of Korea
| | - Soon-Kwang Hong
- Department of Biological Sciences, Myongji University, Yongin, Gyeonggido, 17058, Republic of Korea.
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9
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Mishra S, Kundu K. Synthesis, characterization and applications of polyacrylamide grafted fenugreek gum (FG-g-PAM) as flocculant: Microwave vs thermal synthesis approach. Int J Biol Macromol 2019; 141:792-808. [DOI: 10.1016/j.ijbiomac.2019.09.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 09/04/2019] [Accepted: 09/05/2019] [Indexed: 10/26/2022]
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10
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Zhang M, Zhang S, Chen Z, Wang M, Cao J, Wang R. Preparation and Characterization of Superabsorbent Polymers Based on Sawdust. Polymers (Basel) 2019; 11:polym11111891. [PMID: 31731757 PMCID: PMC6918447 DOI: 10.3390/polym11111891] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/11/2019] [Accepted: 11/13/2019] [Indexed: 02/07/2023] Open
Abstract
Sawdust, a cheap by-product of the timber and forestry industry, was considered as a framework structure to prepare superabsorbent polymer with acrylic acid (AA) and acrylamide (AM), the synthetic monomers. The effects of initiator content, crosslinker content, AA content, AM content, degree of neutralization of AA, and reaction temperature on the swelling rate of superabsorbent polymer were investigated. The synthesized polymer was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Under optimal synthesis conditions, the results showed that the swelling rate of the polymer in deionized water and 0.9% NaCl solution reached 738.12 and 90.18 g/g, respectively. The polymer exhibits excellent swelling ability, thermal stability, and reusability. After the polymer was introduced into the samples (soil or coal), the water evaporation rate of the samples was significantly reduced, and the saturated water holding capacity and pore structure were also significantly improved.
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Affiliation(s)
- Mingchang Zhang
- MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China; (M.Z.); (S.Z.); (Z.C.); (J.C.)
| | - Shaodi Zhang
- MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China; (M.Z.); (S.Z.); (Z.C.); (J.C.)
| | - Zhuoran Chen
- MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China; (M.Z.); (S.Z.); (Z.C.); (J.C.)
| | - Mingzhi Wang
- MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China; (M.Z.); (S.Z.); (Z.C.); (J.C.)
- Correspondence: ; Tel.: +86-010-62336225
| | - Jinzhen Cao
- MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China; (M.Z.); (S.Z.); (Z.C.); (J.C.)
| | - Ruoshui Wang
- School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;
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11
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Mahto A, Mishra S. Design, development and validation of guar gum based pH sensitive drug delivery carrier via graft copolymerization reaction using microwave irradiations. Int J Biol Macromol 2019; 138:278-291. [DOI: 10.1016/j.ijbiomac.2019.07.063] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/07/2019] [Accepted: 07/08/2019] [Indexed: 10/26/2022]
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12
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Lactic acid oligomer (OLLA) grafted gum arabic based green adhesive for structural applications. Int J Biol Macromol 2018; 120:711-720. [DOI: 10.1016/j.ijbiomac.2018.07.199] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 07/31/2018] [Accepted: 07/31/2018] [Indexed: 11/20/2022]
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13
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Li H, Liu J, Zheng X, Ji C, Mu Q, Liu R, Liu X. Synthesis of a branched photosensitive copolymer and its application for negative-type photoresists. J Appl Polym Sci 2016. [DOI: 10.1002/app.42838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hu Li
- Key Laboratory of Food Colloids and Biotechnology (Ministry of Education), School of Chemical and Material Engineering; Jiangnan University; Wuxi 214122 China
| | - Jingcheng Liu
- Key Laboratory of Food Colloids and Biotechnology (Ministry of Education), School of Chemical and Material Engineering; Jiangnan University; Wuxi 214122 China
| | - Xiangfei Zheng
- Suzhou Rui Hong Electronic Chemicals Company, Limited; Suzhou Jiangsu 215124 China
| | - Changwei Ji
- Suzhou Rui Hong Electronic Chemicals Company, Limited; Suzhou Jiangsu 215124 China
| | - Qidao Mu
- Suzhou Rui Hong Electronic Chemicals Company, Limited; Suzhou Jiangsu 215124 China
| | - Ren Liu
- Key Laboratory of Food Colloids and Biotechnology (Ministry of Education), School of Chemical and Material Engineering; Jiangnan University; Wuxi 214122 China
| | - Xiaoya Liu
- Key Laboratory of Food Colloids and Biotechnology (Ministry of Education), School of Chemical and Material Engineering; Jiangnan University; Wuxi 214122 China
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14
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Dao VH, Cameron NR, Saito K. Synthesis, properties and performance of organic polymers employed in flocculation applications. Polym Chem 2016. [DOI: 10.1039/c5py01572c] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recent developments on the synthesis and flocculation efficiency of several non-ionic, cationic, anionic and amphoteric polymers are presented and summarised.
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Affiliation(s)
- Vu H. Dao
- School of Chemistry
- Monash University
- Clayton
- Australia
| | - Neil R. Cameron
- Department of Materials Science and Engineering
- Monash University
- Clayton
- Australia
- School of Engineering
| | - Kei Saito
- School of Chemistry
- Monash University
- Clayton
- Australia
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15
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Rani GU, Dey KP, Bharti S, Mishra S. Controlled drug release of 5-amino salicylic acid by poly(2-hydroxyethylmethacrylate) grafted agar. Front Chem Sci Eng 2014. [DOI: 10.1007/s11705-014-1452-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Usha Rani G, Konreddy AK, Mishra S, Sen G. Synthesis and applications of polyacrylamide grafted agar as a matrix for controlled drug release of 5-ASA. Int J Biol Macromol 2014; 65:375-82. [DOI: 10.1016/j.ijbiomac.2014.01.034] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Revised: 01/05/2014] [Accepted: 01/17/2014] [Indexed: 10/25/2022]
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17
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Santhana Krishna Kumar A, Uday Kumar C, Rajesh V, Rajesh N. Microwave assisted preparation of n-butylacrylate grafted chitosan and its application for Cr(VI) adsorption. Int J Biol Macromol 2014; 66:135-43. [PMID: 24530325 DOI: 10.1016/j.ijbiomac.2014.02.007] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 01/28/2014] [Accepted: 02/03/2014] [Indexed: 10/25/2022]
Abstract
Biopolymers such as chitosan possess excellent properties suited for varied applications. In this work, we describe a novel microwave assisted method for the preparation of n-butylacrylate grafted chitosan adsorbent and its utility for the adsorption of chromium(VI). A 3 min irradiation time was enough to prepare the adsorbent, and techniques such as FT-IR, powder XRD, SEM and EDS were used for comprehensive characterization. The adsorption was effective at pH 3.5 with 25 mL of 20 ppm Cr(VI) solution. Langmuir, Freundlich, Dubinin-Radushkevich, Temkin, Elovich and Redlich isotherms were studied in detail. The ΔG, ΔH and ΔS parameters were evaluated to understand the adsorption thermodynamics. The adsorption involves the interaction of Cr(VI) with the hydroxyl and amino groups in chitosan.
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Affiliation(s)
- A Santhana Krishna Kumar
- Department of Chemistry, Birla Institute of Technology and Science, Pilani-Hyderabad Campus, Jawahar Nagar, Shameerpet Mandal, R.R. Dist, 500 078 AP, India
| | - Chinta Uday Kumar
- Department of Chemistry, Birla Institute of Technology and Science, Pilani-Hyderabad Campus, Jawahar Nagar, Shameerpet Mandal, R.R. Dist, 500 078 AP, India
| | - Vidya Rajesh
- Department of Biological Sciences, Birla Institute of Technology and Science, Pilani-Hyderabad campus, Jawahar Nagar, Shameerpet Mandal R.R. Dist, 500 078 AP, India
| | - N Rajesh
- Department of Chemistry, Birla Institute of Technology and Science, Pilani-Hyderabad Campus, Jawahar Nagar, Shameerpet Mandal, R.R. Dist, 500 078 AP, India.
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