Free radical graft copolymerization of N-vinyl-2-pyrrolidone onto k-carrageenan in aqueous media and applications

Mishra, Meenakshi; Sand, Arpit; Mishra, Dinesh Kumar; Yadav, Mithilesh; Behari, Kunj

doi:10.1016/j.carbpol.2010.04.080

Cited by 35 publications

(13 citation statements)

References 33 publications

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“…Hosseinzadeh (2009) grafted acrylonitrile into κ-carrageenan and found that the grafting ratio increased with ceric ammonium nitrate (the initiator) concentration reaching a maximum value of~85 % at 0.008 mol L −1 . The pair peroxymonosulfate/maleic acid has been used as redox initiator in the grafting of N-vinyl-2-pyrrolidone into κ-carrageenan (Mishra et al 2010); according to the authors, spectroscopic data confirm that the grafting was produced at OH group of κ-carrageenan. By using the same redox initiator, Yadav et al (2012) conducted the graft copolymerizatioin of vinyl sulfonic acid into κ-carrageenan.…”

Section: Discussionmentioning

confidence: 94%

“…Recently, studies on the application of carrageenans in drug delivery systems have gained much interest (Nanaki et al 2010;Rana et al 2011;Li et al 2013Li et al , 2014. On the other hand, copolymerization of carrageenans with vinyl monomers produces graft copolymers with new properties and applications Meena et al 2006;Pourjavadi et al 2008;Hosseinzadeh 2009;Mishra et al 2010;Sand et al 2012;Yadav et al 2012;Verma et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Carrageenans from nuclear phases of subantartic Mazzaella laminarioides (Gigartinales, Rhodophyta) and graft copolymerization of alkali-modified carrageenan with acrylamide

et al. 2015

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Aqueous extraction of cystocarpic, tetrasporic, and vegetative individuals of Mazzaella laminariodes collected in the Magellan Ecoregion, Southern Chile, afforded sulfated galactans. Analysis by Fourier transform infrared spectroscopy (FT-IR) and by 1 H and 13 C NMR spectroscopy indicated that purified extracts from cystocarpic (CP) and vegetative individuals (VP) were mixtures of κ/ι-type carrageenans and their precursors μ-and ν-carrageenans, whereas the aqueous extract from tetrasporic individuals was a λ-type carrageenan. Alkaline treatment of CP and VP polysaccharides produced modified polysaccharides with lower content of sulfate groups and with a concomitant increase of 3,6-anhydrogalactose content; analysis by 2D 1 H and 13 C NMR indicated the presence of hybrid κ-ι-carrageenans. Copolymerization of alkalitreated CP carrageenan with acrylamide was achieved by using ceric ammonium nitrate as the initiator; studies by NMR spectroscopy indicated grafting of polyacrylamide at position C-6 of β-galactopyranosyl residues. Reaction of modified CP with acrylamide assisted by microwave irradiation in the presence of ammonium persulfate afforded a copolymer grafted at position C-2 of β-galactopyranosyl residues.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Carrageenans from nuclear phases of subantartic Mazzaella laminarioides (Gigartinales, Rhodophyta) and graft copolymerization of alkali-modified carrageenan with acrylamide

et al. 2015

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“…In a study, Sand et al [35] reported the utilization of nonbiodegradable graft co-polymers of xanthan gum and 2-acrylamidoglycolic acid as flocculants. In another study, the nonbiodegradable graft co-polymer of N-vinyl-2-pyrrolidone onto kcarrageenan was also used as a potential flocculent [36]. Recently, we reported the synthesis of gum ghatti and vinyl monomers based flocculants using different reaction conditions, for example, like inair, in-vacuum or under pressure [16,37,38].…”

Section: Introductionmentioning

confidence: 99%

Gum ghatti and poly(acrylamide-co-acrylic acid) based biodegradable hydrogel-evaluation of the flocculation and adsorption properties

Mittal

Maity

Ray

2015

Polymer Degradation and Stability

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“…[4] Alginate is a biodegradable hydrophilic polymer, relatively inert, biocompatible, gelling agent, with adhesive properties, which are desirable characteristics for insecticide formulation, although it shows poor mechanical strength. [5] Nanotechnology has been a resource considered to solve this problem. Nanostructured materials are those materials that have, in at least one direction, dimension in the nanometer range, which gives them unique characteristics.…”

Section: Introductionmentioning

confidence: 99%

Polymer/Layered Silicate Nanocomposite as Matrix for Bioinsecticide Formulation

Batista

Souza

Santos-Magalhães

et al. 2014

Macromolecular Symposia

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Summary: Due to current encouragement to the use of bioinsecticides for pest control and the susceptibility of biological agents to external factors, we investigated the use of a polymer nanocomposite (PLN, polymer/ layered silicate nanocomposite) as matrix to encapsulate an entomopathogenic fungus active against pest insects of palm trees. The beads were formed by extrusion and the following variables were assessed: fungus conidial concentration (series 1: 10 7 ; series 2: 10 8 and series 3: 10 9 conidia/mL) and nanolayered silicate concentration (0; 0.5; 1; 2 and 4%). The matrix was evaluated by X-ray powder diffraction and Fourier transform infrared spectroscopy and the following characteristics of the products were assessed: percent of encapsulated conidia, size distribution and polydispersity index, swelling index, formulation's in vitro ability to release conidia and stability under different storage temperatures. PLN, whose interactions could be visualized by FTIR, proved to be a potential matrix for this fungus, because, while composed by natural substances non-toxic to the environment, it succeeded to encapsulate high amounts of conidia (series 2). A barrier effect with bentonite increase was also demonstrated by increased fungus germination time and thermal stability.

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Free radical graft copolymerization of N-vinyl-2-pyrrolidone onto k-carrageenan in aqueous media and applications

Cited by 35 publications

References 33 publications

Carrageenans from nuclear phases of subantartic Mazzaella laminarioides (Gigartinales, Rhodophyta) and graft copolymerization of alkali-modified carrageenan with acrylamide

Carrageenans from nuclear phases of subantartic Mazzaella laminarioides (Gigartinales, Rhodophyta) and graft copolymerization of alkali-modified carrageenan with acrylamide

Gum ghatti and poly(acrylamide-co-acrylic acid) based biodegradable hydrogel-evaluation of the flocculation and adsorption properties

Polymer/Layered Silicate Nanocomposite as Matrix for Bioinsecticide Formulation

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