Hydrogels as controlled release devices in agriculture

Rudzinski, Walter E.; Dave, A. M.; Vaishnav, Ujval H; Kumbar, Sangamesh G.; Kulkarni, Akshay; Aminabhavi, Tejraj M.

doi:10.1163/156855502760151580

Cited by 235 publications

(144 citation statements)

References 115 publications

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“…Hydrogels specially based on natural polymers have been used as controlled-release devices for the encapsulation of pesticides (Kenawy 1998;Rudzinski et al 2002;Puoci et al 2008). Nowadays, natural polymers-based superabsorbent hydrogels have been observed material of great interest in the scientific and industrial field due to their biodegradable character and the high swelling capacity (Esposito et al 1996;Sannino et al 2003).…”

Section: +3mentioning

confidence: 99%

Polysaccharides as safer release systems for agrochemicals

Campos

Oliveira

Fraceto

et al. 2014

Agron. Sustain. Dev.

278

175

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Agrochemicals are used to improve the production of crops. Conventional formulations of agrochemicals can contaminate the environment, in particular in the case of intensive cropping. Hence, there is a need for controlledrelease formulations of agrochemicals such as polysaccharides to reduce pollution and health hazards. Natural polysaccharides are hydrophilic, biodegradable polymers. This article reviews the use of polysaccharides in the form of micro-and nanoparticles, beads and hydrogels. The main points are: (1) slow release formulations minimize environmental impact by reducing agrochemical leaching, volatilization and degradation. For example, 50 % of the encapsulated insecticide chlorpyrifos is released in 5 days, whereas free chlorpyrifos is released in 1 day. (2) Slow release formulations increase the water-holding capacity of soil. (3) Slow release formulations better control weeds in the long run. (4) Polymer-clay formulations store ionic plant nutrients. (5) Polymer hydrogel formulations reduce compaction, erosion, and water run-off. They increase soil permeability and aeration, infiltration rates, and microbial activity, and, in turn, plant performance. In conclusion, polysaccharide formulations can be used for safer use of agrochemicals.

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Section: +3mentioning

confidence: 99%

Polysaccharides as safer release systems for agrochemicals

Campos

Oliveira

Fraceto

et al. 2014

Agron. Sustain. Dev.

278

175

View full text Add to dashboard Cite

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“…for separation of these from aqueous solutions [57,58]. NIPAM-based hydrogels and anionic comonomers are used for the removal of pollutants with the aim of the environmental protection [59][60][61]. Optical humidity sensors are made from poly(NIPAM-co-AA) microgels in the study of Islam et al [62].…”

Section: Introductionmentioning

confidence: 99%

Hydrogels based on N-isopropylmethacrylamide and N-isopropylacrylamide

Urošević¹,

Nikolić²,

Ilić‐Stojanović³

et al. 2018

Adv Techol

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Hydrogels are three-dimensional polymer networks which have the capacity to retain a large quantity of water or biological fluids in the swollen state. Thermosensitive hydrogels have received special attention of reserachers since they represent a parameter which frequently changes in chemical, biological and physiological systems. Thermosensitive hydrogels have the critical solution temperature, i.e. they exhibit a substantial change in volume with the temperature change. Homopolymers poly(N-isopropylmethacrylamide) (poly(NIPMAM)) and poly(N-isopropylacrylamide) (poly(NIPAM)) are thermosensitive materials which have lately become the subject of intensive study. Monomer N-isopropylmethacrylamide, NIPMAM, enters into copolymerization with monomer N-isopropylacrylamide, NIPAM, in order to create a system with a phase transition temperature approximate to the human body temperature. In literature data there is available information on the synthesis and characterization of microgels, nanogels and copolymers based on NIPMAM and NIPAM. These thermosensitive polymer materials are used in controlled drug delivery and protein immobilization.

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“…Nesse contexto, o emprego de hidrogéis como veículos biodegradáveis tem merecido a atenção dos pesquisadores. Hidrogéis são materiais formados por redes tridimensionais de polímeros hidrofílicos que possuem habilidade de absorver grande quantidade de água (Rudzinski et al, 2002;Francis et al, 2006;Fang et al, 2007;Kimhi & Bianco-Peled, 2007). O principal benefício do sistema de liberação controlada é aumentar a eficiência funcional de insumos sintetizados quimicamente (nutrientes, herbicidas, inseticidas e parasiticidas) ou de natureza biológica (microrganismos com atividade específica contra uma praga-alvo), diminuindo custos, bem como aumentando a segurança no manuseio desses produtos, reduzindo riscos de toxidez para o homem, de concentrações elevadas na lavoura e de contaminação ambiental.…”

Section: Introductionunclassified