Synthesis and characterization of agar-starch based hydrogels for slow herbicide delivery applications

Singh, Baljit; Sharma, Devinder; Negi, Sunil; Dhiman, Abhishek

doi:10.1007/s12588-015-9126-z

Cited by 28 publications

(16 citation statements)

References 49 publications

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“…However, traditionally synthesized polymers are not biodegradable, which restricts their industrial application in agriculture. Therefore, natural polysaccharides such as cellulose (Ibrahim, Abd-Eladl, & Abou-Baker, 2015;Zhang et al, 2017a), lignocellulose (El-Saied, Waly, & Basta, 2000;El-Saied, Waley, Basta, & El-Hadi, 2004;El-Saied, Basta, El-Hadi, & Waley, 2007), starch Singh, Sharma, Negi, & Dhiman, 2015), and chitosan (Kashyap, Xiang, & Heiden, 2015;Perez & Francois, 2016) have been studied for the synthesis of hydrogels, due to their abundance, biodegradability, renewability, and low cost. Starch is one of the first and most promising materials used to produce hydrogels due to its chemical versatility and relatively easier processability among polysaccharides (Ismail, Irani, & Ahmad, 2013;Zhang & Xu, 2017).…”

Section: Introductionmentioning

confidence: 99%

Rheokinetics of graft copolymerization of acrylamide in concentrated starch and rheological behaviors and microstructures of reaction products

Bao

Simon

Shen

et al. 2018

Carbohydrate Polymers

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A widely recognized challenge in starch chemistry is to manipulate the graft copolymerization onto starch melt by reactive extrusion (REX). To understand the complex in-situ graft copolymerization in highly concentrated systems, we firstly used a mixer to achieve a homogeneous viscous starch melt, and then undertook dynamic rheological measurements to study the rheokinetics of the reaction. The in-situ synthesis also facilitated the characterization of the microstructures of reaction products. The melt mixture could be regarded to be completely micromixed since the rheokinetics was predominated by the reaction kinetics. The rheological characterization revealed that G'of hydrogels followed a linear progression with the crosslinker concentration. Nevertheless, the reaction temperature and initiator content had little influence on the final microstructure of hydrogels, most likely due to the strong chain transfer reaction in the melt. Additionally, high-amylose starches tended to form grafted hydrogels with a high physical crosslinking density.

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Section: Introductionmentioning

confidence: 99%

Rheokinetics of graft copolymerization of acrylamide in concentrated starch and rheological behaviors and microstructures of reaction products

Bao

Simon

Shen

et al. 2018

Carbohydrate Polymers

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“…51 This polysaccharide can be used as a soil conditioner and increases the crop yield through the development of hydrogels. 24 It is also a useful plant growth promoter by degrading bacterial species, improving soil health, and modifying microbial activity. It can also promote the release of plant protection products formulations in a slow, controlled, and precise way, based on hydrogels, which minimizes environmental and health problems (e.g., reduce the leaching of plant protection products into the soil, such as atrazine).…”

Section: Marine Raw Materialsmentioning

confidence: 99%

“…It can also promote the release of plant protection products formulations in a slow, controlled, and precise way, based on hydrogels, which minimizes environmental and health problems (e.g., reduce the leaching of plant protection products into the soil, such as atrazine). 24 Agar contains a mixture of agarose (gelling agent) and agaropectin (sulfated charged polymer). 51 Agarose is responsible for the development of hydrogels: the chains of agarose combine in double helices by hydrogen bonding and electrostatic and hydrophobic interactions, creating a 3D structure (hydrogel).…”

Section: Marine Raw Materialsmentioning

confidence: 99%

Repurposing of Marine Raw Materials in the Formulation of Innovative Plant Protection Products

Caramona

Coimbra

Pinto

et al. 2022

J. Agric. Food Chem.

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Over the years, the growth of the world population has caused a huge agricultural production to support the population’s needs. Since plant protection products are essential to preserve agricultural crops and to optimize vital plant processes, it is crucial to use more sustainable, biodegradable, and biocompatible raw materials, without harming the environment and human health. Although the development of new plant protection products is a costly process, the environmental benefits should be considered. In this context, marine raw materials obtained as byproducts of fishing industries, possessing a wide variety of physicochemical and biological properties, can serve as a promising source of such materials. They have a high potential for developing alternative and safe formulations for agricultural applications, not only as biocompatible excipients but also as effective and selective, or even both. It is also possible to promote a synergistic effect between an active substance and the biological activity of the marine polymer used in the formulation, enabling plant protection products with lower concentrations of the active substances. Thus, this review addresses the repurposing of marine raw materials for the development of innovative plant protection products, focusing on micro- and nanoparticulate formulations, to protect the environment through more ecological and sustainable strategies.

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“…CRFs of pesticide based on hydrogels is crucial to prolong the release cycle of active ingredients, control weeds in a long run, improve soil properties, such as permeability, aeration, infiltration rates, microbial activity and water‐holding capacity . Baljit Singh mentioned that agar/starch/poly(AAm) hydrogels have been prepared for slow delivery of herbicide, and the release of atrazine from the hydrogels occurred through non‐fickian diffusion mechanism. Chai Bai et al .…”

Section: Introductionmentioning

confidence: 99%

Amphoteric superabsorbent polymer based on waste collagen as loading media and safer release systems for herbicide 2, 4‐D

Yin

Wang

et al. 2019

J of Applied Polymer Sci

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As release formulations, superabsorbent polymers have attracted considerable attentions to reduce herbicide leaching and mitigate contamination. For this purpose, this study dealt with preparation, characterization, and performance test of a novel amphoteric superabsorbent polymer in adsorption and release of 2, 4-Dichlorophenoxyacetic acid (2, 4-D) herbicide. LW-g-p(AA-co-DMDAAC) was successfully synthesized by using leather waste (LW) as raw material and acrylic acid (AA), and dimethyldiallylammonium chloride (DMDAAC) as monomers. Then, the resulting LW-g-p(AA-co-DMDAAC) was characterized before and after 2, 4-D sorption by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). In addition, LW-g-p(AA-co-DMDAAC) with great equilibrium swelling capacity of 3203 g/g in distilled water, 181 g/g in 0.9 wt % NaCl exhibited excellent performance of swelling. Two absorption peaks appeared at pH = 4 and 7 solely when swelling occurred, and the swelling behavior in pH = 7 satisfied the pseudo first-order kinetic equation. Moreover, the sorbed 2, 4-D reached at 68 mg/g and showed sustained release cycle of 45 days under acidic or alkaline conditions. Therefore, the sustained release pattern of 2, 4-D as well as water absorbency made LW-g-p (AA-co-DMDAAC) suitable and potential candidate for controlling the release of herbicides to improve utilization and reduce environmental pollution.

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Synthesis and characterization of agar-starch based hydrogels for slow herbicide delivery applications

Cited by 28 publications

References 49 publications

Rheokinetics of graft copolymerization of acrylamide in concentrated starch and rheological behaviors and microstructures of reaction products

Rheokinetics of graft copolymerization of acrylamide in concentrated starch and rheological behaviors and microstructures of reaction products

Repurposing of Marine Raw Materials in the Formulation of Innovative Plant Protection Products

Amphoteric superabsorbent polymer based on waste collagen as loading media and safer release systems for herbicide 2, 4‐D

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