Neem Seed Oil: Encapsulation and Controlled Release - Search for a Greener Alternative for Pest Control

Devi, Nirmala; Maji, Tarun K.

doi:10.5772/17590

Cited by 14 publications

(16 citation statements)

References 88 publications

(73 reference statements)

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“…This Fickian diffusion mechanism indicates that fertilizer diffuses partially through a swollen matrix and water-filled pores in the prepared samples. As reported in literature, when the active agent is surrounded or encapsulated by polymeric layer, as in this case, the release mechanism will be diffusion-controlled mechanism and the active agent is released out to the environment by diffusion, through the micro-pores of the capsule walls [33]. Wu and Liu [20] prepared controlled release NPK fertilizer with the inner coating of chitosan and the outer coating of poly(acrylic acid-co-acrylamide) superabsorbent polymer.…”

Section: Fertilizer Releasementioning

confidence: 96%

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

2015

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Preparation of a new core-shell slow-release fertilizer formulation was conducted through the coating of commercial NPK fertilizer with hydrogel/clinoptilolite (Hyd/CL) nanocomposite. The Hyd/CL nanocomposite was prepared from free radical polymerization of sodium alginate, acrylic acid, acrylamide, and clinoptilolite zeolite. The uniform coating on the surface of the fertilizer granules was verified by scanning electron microscopy. The swelling kinetics as well as the water-retention property and water absorption rate of the prepared samples was studied. Furthermore, the release of fertilizer from Hyd/CL nanocomposite-coated fertilizer granules into soil showed that the Hyd/CL nanocomposite layer around the fertilizer granules caused the system to liberate the nutrient in a more controlled manner (lower than 57 % of loaded fertilizer on the 30 days) than that with the uncoated fertilizer. The overall results eventually suggested that the hydrogel nanocomposite designed in this work can be used as a coating on granular fertilizer compounds for application in agriculture due to its water-retention and slow-release properties.

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Section: Fertilizer Releasementioning

confidence: 96%

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

2015

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“…Uma das soluções para contornar esse problema é o encapsulamento dos compostos naturais em escala nanométrica (Perlatti et al, 2013), o que, além de aumentar o efeito residual, possibilita o controle da liberação do ingrediente ativo (Devi & Maji, 2011), permitindo melhorar a eficiência e a persistência dos biopesticidas (Mattoso et al, 2005). Polímeros biodegradáveis têm sido utilizados com sucesso como agentes encapsulantes, entre eles a poli-ε-caprolactona (PCL) e o poli-β-hidroxibutirato (PHB) (Ferreira et al, 2012).…”

Section: Introductionunclassified

Efeito inseticida sistêmico de nanoformulações à base de nim sobre Bemisia tabaci (Hemiptera: Aleyrodidae) biótipo B em tomateiro

et al. 2015

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ResumoEste estudo avaliou a ação inseticida sistêmica e o efeito residual de nanoformulações à base de derivados de nim (Azadirachta indica A. Juss, Meliaceae) sobre ninfas de Bemisia tabaci biótipo B (Hemiptera: Aleyrodidae), espécie-praga de diversas culturas de importância econômica. Suspensões coloidais contendo nanocápsulas carregadas com produtos derivados de A. indica foram preparadas utilizando polímeros biodegradáveis como poli-ε-caprolactona (PCL) e poli-β-hidroxibutirato (PHB). A matriz encapsulada era composta por uma formulação comercial contendo uma quantidade enriquecida e conhecida dos limonoides azadiractina e 3-tigloilazadiractol (Azamax  1,2 CE). Inicialmente foi estimada a CL 50 , para ninfas de B. tabaci, de soluções contendo óleo de nim, que foram aplicadas via água de irrigação (solo) em tomateiro. Posteriormente, dois lotes de nanoformulações, com variação no tipo e quantidade dos polímeros e na quantidade do óleo comercial, foram testados quanto à ação sistêmica. As nanoformulações NC L5-2 (com nanocápsulas de PCL) e NC L6-1 (com nanocápsulas de PHB), as mais eficazes entre as testadas, foram avaliadas quanto ao efeito residual. A CL 50 estimada foi de 180,67 mg L -1 de azadiractina. Constatou-se também que a ação sistêmica de óleos e nanoformulações contendo compostos de nim dependem das condições ambientais em que são aplicados. O Azamax  não apresenta efeito deterrente sobre a oviposição, nem age sobre o desenvolvimento embrionário da mosca-branca quando aplicado via água de irrigação no solo no momento da infestação. As nanoformulações selecionadas são bioativas mesmo cerca de 30 dias após a aplicação, não diferindo do produto comercial.Palavras-chave: nanotecnologia, bioatividade, MIP, Azadirachta indica. Systemic insecticidal effect of neem-based nanoformulations against Bemisia tabaci (Hemiptera: Aleyrodidae) biotype B in tomato AbstractThis study evaluated the systemic insecticidal action and the residual effect of neem-based nanoformulations (Azadirachta indica A. Juss, Meliaceae) on Bemisia tabaci biotype B (Hemiptera: Aleyrodidae) nymphs, a pest of several economic important crops. Colloidal suspensions containing nanocapsules loaded with derived products from A. indica were prepared by using biodegradable polymers such as poly-ε-caprolactone (PCL) and poly-β-hydroxybutyrate (PHB).The encapsulated matrix was a commercial formulation, which contained not only enriched amount of limonoids azadirachtin and 3-tigloilazadiractol, but also in known quantities (Azamax  1.2 CE). Initially, it was estimated the LC 50 of solutions containing neem oil, which were applied through irrigation water (soil) in tomato in order to control nymphs of B. tabaci. Afterwards, two lots of nanoformulations, varying in type and amount of polymers and in quantity of commercial oil, were evaluated for systemic action. The nanoformulations NC L5-2 (nanocapules in PCL) and NC L6-1 (nanocapsules in PHB) caused higher mortality among others and for this reason were assayed for residual effect. The estimat...

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“…Although natural enemies are sensitive to direct contact with such materials, the predators and the parasitoids which attack the product following 1-2 days of treatment, are not affected by the toxin (Isman 2006). Plant oils are generally considered broad-spectrum and safe for the environment because the array of compounds the oils contain quickly biodegrade in the soil (Rajendran and Sriranjini 2008;Devi and Maji 2011). The essential oils of several plant species such as: Apiaceae, Asteraceae, Cupressaceae, Lamiaceae, Lauraceae, Myrtaceae, Rutaceae, Poaceae, Piperaceae, and Zingiberaceae are characterised by insecticidal properties (Tripathi et al 2009;Isman et al 2010;RegnaultRoger et al 2012;Ebadollahi 2013;Mahmoodi et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Eucalyptus dundasii Maiden essential oil, chemical composition and insecticidal values against Rhyzopertha dominica (F.) and Oryzaephilus surinamensis (L.)

Aref¹,

Valizadegan²,

Farashiani³

2015

Journal of Plant Protection Research

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Abstract:The insecticidal effects of Eucalyptus dundasii Maiden essential oil was studied on the adults of the lesser grain borer, Rhyzopertha dominica (F.), and the saw-toothed grain beetle, Oryzaephilus surinamensis (L.). Essential oil was obtained by the hydro-distillation method and essential oil composition was analysed by GC-MS. Chemical analysis indicated that 1,8-cineole (54.15%), p-cymene (12.41%), α-thujene (11.37%), and E-caryophyllene (6.7%) were major constituents. For R. dominica and O. surinamensis, the LC 50 of E. dundasii essential oil was 41.69 and 57.92 μl · l -1 of air, respectively. Increasing the concentration of the essential oil and the exposure time, increased mortality. The durability of fumigant toxicity on O. surinamensis adults was higher than on R. dominica adults and was statistically different. Based on the mean of the repellent indexes and the standard deviation, E. dundasii essence was repellent for both insects at 70, 140, and 280 μl · l -1 of air concentrations. Statistical analysis showed that Relative Growth Rate (RGR) in O. surinamensis was higher than in R. dominica, and the Relative Consumption Rate (RCR), the Efficiency of Conversion of Ingested food (ECI), and the Feeding Deterrence Index (FDI) in O. surinamensis was lower than in R. dominica. The many diverse bio-effects of E. dundasii essential oil confirmed that it is a good candidate for management of R. dominica and O. surinamensis.

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Neem Seed Oil: Encapsulation and Controlled Release - Search for a Greener Alternative for Pest Control

Cited by 14 publications

References 88 publications

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

Efeito inseticida sistêmico de nanoformulações à base de nim sobre Bemisia tabaci (Hemiptera: Aleyrodidae) biótipo B em tomateiro

Eucalyptus dundasii Maiden essential oil, chemical composition and insecticidal values against Rhyzopertha dominica (F.) and Oryzaephilus surinamensis (L.)

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