Release of DNA from cryogel PVA-DNA membranes

Valente, Artur J.M.; Cruz, Sandra M. A.; Morán, Carmen; Murtinho, Dina; Muniz, Edvani C.; Miguel, Maria G.

doi:10.3144/expresspolymlett.2010.61

Cited by 15 publications

(7 citation statements)

References 35 publications

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“…It shows two main limitations: (i) applicability is restricted to short releases and (ii) does not consider erosion. Following such approach, different researchers has been used this model that showed robustness for describing the whole release profile in different systems [164][165][166].…”

Section: Mathematical Models For Treating Nutrient Release Profiles Datamentioning

confidence: 99%

Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

Guilherme

Aouada

Fajardo

et al. 2015

European Polymer Journal

605

325

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a b s t r a c t Superabsorbent hydrogels (SH) continue being a very important issue in both academic and industrial fields due to their applications in several technologies. This is proved by the impressive number of publications, through papers and patents as well, dealing with SH. This review is targeted to update and discuss some important aspects of synthesis, characterization and application of SH in agriculture, mainly those based on polysaccharides, as soil conditioners and as polymer carriers for nutrient release. Basic properties of SH and some methods for chemically modifying polysaccharides are given and some directions for hydrogels preparation are highlighted as well. Mechanisms associated with water transport into the 3D matrix, taking into account the transference of mass from hydrogelsoil system to plant, are discussed in the light of some mathematical models. Release of nutrients either from granules coated by hydrophilic polymer or from SH, targeting applications in agriculture, is also discussed on the basis of often used mathematical models (the swelling-based kinetic models) and on a diffusion-based kinetic model with a partition activity coefficient. Examples of recent applications in agriculture as soil conditioners and carriers for nutrient release (fertilizers, etc.) are given. At the final, future trends and perspectives are considered. More than two hundreds references are cited in the whole text.

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Section: Mathematical Models For Treating Nutrient Release Profiles Datamentioning

confidence: 99%

Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

Guilherme

Aouada

Fajardo

et al. 2015

European Polymer Journal

605

325

View full text Add to dashboard Cite

show abstract

“…Other applications include antifoaming agent in fermentation processes [317], metal and dye removal, either acting as an anchor [318][319][320] or by micellar extraction [321], formation of photosensitive structures [322][323][324] and the development of stimulus responsive gels [325,326]. Furthermore, bolaform surfactants are also relevant for biochemistry and pharmaceutical applications, by modeling lipid membranes [327][328][329], as permeability enhancers [330] or to be used for drugs encapsulation [331], respectively.…”

Section: Bolaform Surfactantsmentioning

confidence: 99%

The formation of host–guest complexes between surfactants and cyclodextrins

Valente

Söderman

2014

Advances in Colloid and Interface Science

184

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Cyclodextrins are able to act as host molecules in supramolecular chemistry with applications ranging from pharmaceutics to detergency. Among guest molecules surfactants play an important role with both fundamental and practical applications. The formation of cyclodextrin/surfactant host-guest compounds leads to an increase in the critical micelle concentration and in the solubility of surfactants. The possibility of changing the balance between several intermolecular forces, and thus allowing the study of, e.g., dehydration and steric hindrance effects upon association, makes surfactants ideal guest molecules for fundamental studies. Therefore, these systems allow for obtaining a deep insight into the host-guest association mechanism. In this paper, we review the influence on the thermodynamic properties of CD-surfactant association by highlighting the effect of different surfactant architectures (single tail, double-tailed, gemini and bolaform), with special emphasis on cationic surfactants. This is complemented with an assessment of the most common analytical techniques used to follow the association process. The applied methods for computation of the association stoichiometry and stability constants are also reviewed and discussed; this is an important point since there are significant discrepancies and scattered data for similar systems in the literature.In general, the surfactant-cyclodextrin association is treated without reference to the kinetics of the process. However, there are several examples where the kinetics of the process can be investigated, in particular those where volumes of the CD cavity and surfactant (either the tail or in special cases the head group) are similar in magnitude.This will also be critically reviewed.

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“…Although PVA can be easily cross-linked by contact with glutaraldehyde in acidic medium [14] such process presents limitations due to non-uniformity of the obtained matrix and to the severe toxicity of glutaraldehyde. PVA can also be physically crosslinked by repeated freezing-thawing cycles in aqueous solution, creating crystalline clusters that actuate as reticules [15,16]. The advantage of this process is the absence of moieties that could obliterate the biocompatibility.…”

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confidence: 99%

Hydrogels based on chemically modified poly(vinyl alcohol) (PVA-GMA) and PVA-GMA/chondroitin sulfate: Preparation and characterization

Crispim¹,

Piai²,

Fajardo³

et al. 2012

Express Polym. Lett.

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This work reports the preparation of hydrogels based on PVA-GMA, PVA-GMA is poly(vinyl alcohol) (PVA) functionalized with vinyl groups from glycidyl methacrylate (GMA), and on PVA-GMA with different content of chondroitin sulfate (CS). The degrees of swelling of PVA-GMA and PVA-GMA/CS hydrogels were evaluated in distilled water and the swelling kinetics was performed in simulated gastric and intestinal fluids (SGF and SIF). PVA-GMA and PVAGMA/CS hydrogels demonstrated to be resistant on SGF and SIF fluids. The elastic modulus, E, of swollen-hydrogels were determined through compressive tests and, according to the obtained results, the hydrogels presented good mechanical properties. At last, the presence of CS enhances the hydrogel cell compatibility as gathered by cytotoxicity assays. It was concluded that the hydrogels prepared through this work presented characteristics that allow them to be used as biomaterial, as a carrier in drug delivery system or to act as scaffolds in tissue engineering as well

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Release of DNA from cryogel PVA-DNA membranes

Cited by 15 publications

References 35 publications

Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

The formation of host–guest complexes between surfactants and cyclodextrins

Hydrogels based on chemically modified poly(vinyl alcohol) (PVA-GMA) and PVA-GMA/chondroitin sulfate: Preparation and characterization

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