Super water-absorbing new material from chitosan, EDTA and urea

Narayanan, Abathodharanan; Dhamodharan, R.

doi:10.1016/j.carbpol.2015.08.010

Cited by 62 publications

(33 citation statements)

References 23 publications

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“…A similar investigation was also performed by Corradini et al [ 121 ], while Hussain et al encapsulated urea in CHT microspheres obtaining a controlled release of the nutrient [ 122 ]. Recently, a potassium-containing, controlled-release biodegradable material based on CHT and montmorillonite clay layered silicate was prepared, and its structural, thermal, and morphological characterization was performed [ 123 ] and a new, super water-absorbing, material based on CHT, EDTA, and urea was synthesized [ 124 ]. This new material is very promising for its capacity to slow the release of urea and water as well as of metal ions that can be attached through the EDTA component.…”

Section: Use Of Cht Nanoparticles In Agriculturementioning

confidence: 99%

Chitosan Effects on Plant Systems

Malerba

Cerana

2016

IJMS

393

210

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Chitosan (CHT) is a natural, safe, and cheap product of chitin deacetylation, widely used by several industries because of its interesting features. The availability of industrial quantities of CHT in the late 1980s enabled it to be tested in agriculture. CHT has been proven to stimulate plant growth, to protect the safety of edible products, and to induce abiotic and biotic stress tolerance in various horticultural commodities. The stimulating effect of different enzyme activities to detoxify reactive oxygen species suggests the involvement of hydrogen peroxide and nitric oxide in CHT signaling. CHT could also interact with chromatin and directly affect gene expression. Recent innovative uses of CHT include synthesis of CHT nanoparticles as a valuable delivery system for fertilizers, herbicides, pesticides, and micronutrients for crop growth promotion by a balanced and sustained nutrition. In addition, CHT nanoparticles can safely deliver genetic material for plant transformation. This review presents an overview on the status of the use of CHT in plant systems. Attention was given to the research that suggested the use of CHT for sustainable crop productivity.

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Section: Use Of Cht Nanoparticles In Agriculturementioning

confidence: 99%

Chitosan Effects on Plant Systems

Malerba

Cerana

2016

IJMS

393

210

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“…In view of modeling the urea release characteristics, eight formulations based on chitosan, salicylaldehyde and urea (Table 1) were prepared applying the procedure of the in situ hydrogelation described in the Experimental section. It should be remarked that the in situ procedure allowed for efficient encapsulation of a large amount of fertilizer [29][30][31][32]. The formulations were firstly investigated by scanning electron microscopy (SEM) measurements to observe the influence of both the crosslinking density and urea content on their morphology.…”

Section: Resultsmentioning

confidence: 99%

A Theoretical Multifractal Model for Assessing Urea Release from Chitosan Based Formulations

et al. 2020

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This paper reports the calibration of a theoretical multifractal model based on empirical data on the urea release from a series of soil conditioner systems. To do this, a series of formulations was prepared by in situ hydrogelation of chitosan with salicylaldehyde in the presence of different urea amounts. The formulations were morphologically characterized by scanning electron microscopy and polarized light microscopy. The in vitro urea release was investigated in an environmentally simulated medium. The release data were fitted on five different mathematical models, Korsmeyer–Peppas, Zero order, First order, Higuchi and Hixson–Crowell, which allowed the establishment of a mechanism of urea release. Furthermore, a multifractal model, used for the fertilizer release for the first time, was calibrated using these empirical data. The resulting fit was in good agreement with the experimental data, validating the multifractal theoretical model.

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“…35,47,48 For instance, the effects of conditions are mostly investigated such as reaction temperature, reaction time, neutralization degree of AA, the amount ratio of AA to chitosan, the pH of external solution, and the amount of initiators, cross-linkers and monomers. 12,16,46,[49][50][51][52][53][54][55] And a 2 4À1 fractional factorial design is used to evaluate the effects of these parameters. 56,57 As the amount of initiators increases, the macro radicals increases, and thus more acrylic acid are graed onto the chitosan, which means that the average kinetic chain length of PAA becomes shorter, and this improves the water absorbency.…”

Section: Chemical Cross-linking Methodsmentioning

confidence: 99%