Preparation of polyurea microcapsules containing pyrethroid insecticide with hexamethylene diisocyanate isocyanurate

Takahashi, Tadatsugu; Taguchi, Yoshinari; Tanaka, Masato

doi:10.1002/app.27238

Cited by 20 publications

(16 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over the past few years, polymer based microformulation and nanoformulation have been extensively applied to control the delivery and release of pesticide active ingredients, to protect them against degradation, or to increase the solubility of the insoluble active ingredients (Takahashi et al, 2007;Knowles, 2008;Chen and Yada, 2011;Grillo et al, 2012;Loha et al, 2012;Kah et al, 2013;de Oliveira et al, 2014;Kah and Hofmann, 2014). In addition, as encapsulation technology advances from the micro-to nano-scale size range, understanding how the risk to non-target organisms differs becomes of paramount importance.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH and ionic strength on exposure and toxicity of encapsulated lambda–cyhalothrin to Daphnia magna

Son

Hooven

Harper

et al. 2015

Science of The Total Environment

View full text Add to dashboard Cite

Encapsulation of pesticide active ingredients in polymers has been widely employed to control the release of poorly water-soluble active ingredients. Given the high dispersibility of these encapsulated pesticides in water, they are expected to behave differently compared to their active ingredients; however, our current understanding of the fate and effects of encapsulated pesticides is still limited. In this study, we employed a central composite design (CCD) to investigate how pH and ionic strength (IS) affect the hydrodynamic diameter (HDD) and zeta potential of encapsulated λ-cyhalothrin and how those changes affect the exposure and toxicity to Daphnia magna. R(2) values greater than 0.82 and 0.84 for HDD and zeta potential, respectively, irrespective of incubation time suggest those changes could be predicted as a function of pH and IS. For HDD, the linear factor of pH and quadratic factor of pH×pH were found to be the most significant factors affecting the change of HDD at the beginning of incubation, whereas the effects of IS and IS×IS became significant as incubation time increased. For zeta potential, the linear factor of IS and quadratic factor of IS×IS were found to be the most dominant factors affecting the change of zeta potential of encapsulated λ-cyhalothrin, irrespective of incubation time. The toxicity tests with D. magna under exposure conditions in which HDD or zeta potential of encapsulated λ-cyhalothrin was maximized or minimized in the overlying water also clearly showed the worst-case exposure condition to D. magna was when the encapsulated λ-cyhalothrin is either stable or small in the overlying water. Our results show that water quality could modify the fate and toxicity of encapsulated λ-cyhalothrin in aquatic environments, suggesting understanding their aquatic interactions are critical in environmental risk assessment. Herein, we discuss the implications of our findings for risk assessment.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of pH and ionic strength on exposure and toxicity of encapsulated lambda–cyhalothrin to Daphnia magna

Son

Hooven

Harper

et al. 2015

Science of The Total Environment

View full text Add to dashboard Cite

show abstract

“…[9][10][11][12][13][14][15][16][17] Functional papers that release fragrances are useful in applications such as insecticidal sheets that release an insect-repellant VEO. [17][18][19][20][21] For successful application, the paper needs to provide sustained release of the fragrance. In past studies, functional papers have usually been prepared from microcapsules with a binder.…”

Section: Introductionmentioning

confidence: 99%

Direct preparation of gelatin microcapsules on paper surface using simple coacervation technique

Ichiura

Kaneda

2013

J of Applied Polymer Sci

View full text Add to dashboard Cite

A simple coacervation technique was used to coat a functional paper with gelatin microcapsules containing geraniol to prepare functional papers with sustained fragrance release. This method eliminated the need for microcapsule preparation and coating with a binder. A gelatin solution containing geraniol and Tween 20 was coacervated using sodium carbonate (Na 2 CO 3 ) solution; the final Na 2 CO 3 concentration in the solution was 5 wt %. Filter papers impregnated with the coacervation mixture were immersed in 0-20 wt % Na 2 CO 3 solutions. Gelatin microcapsules were formed on the paper surface when 15 or 20 wt % Na 2 CO 3 solutions were used. The maximum amount of geraniol was fixed on paper prepared under these conditions, and the percentage of residual geraniol in the paper (RES) was about 70% after 72 h; this value was much higher than that for a blank sheet. The formation of gelatin microcapsules was important for the fixation and sustained release of geraniol. Figure 5. Residual geraniol for gelatin microcapsules prepared on (l) blank paper, (~) reference paper prepared using geraniol-Ca(OH) 2 composite powder and binder, and papers prepared using (n) 15 wt % Na 2 CO 3 and (^) 20 wt % Na 2 CO 3 . ARTICLE WWW.MATERIALSVIEWS.COM WILEYONLINELIBRARY.COM/APP

show abstract

“…The main purposes of microencapsulation are to protect the core material from environment, to enable controlled release the core material, to modify the surface of core material, to mask the taste of core material, and so on. It is well known that these functions of microcapsules are strongly dependent on the structure of microcapsules and the physical properties of shell materials such as gelation activity, reactivity, responsibility to various stimuli, organic solvent proof, acid and base proof, permeability for oxygen and water vapor and so on [7,8,9]. The type of structure of microcapsule that is constructed is dependent on the preparation method and the physical properties of core and shell materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Microcapsules Containing β-Carotene with Thermo Sensitive Curdlan by Utilizing Reverse Dispersion

Taguchi

Ono

2013

Pharmaceutics

Self Cite

View full text Add to dashboard Cite

We have tried to microencapsulate β-carotene with curdlan of a thermogelation type polysaccharide. Microcapsules were prepared by utilizing reverse dispersion, in which salada oil was the continuous phase (O’) and the curdlan water slurry (W) was the dispersed phase. β-carotene (O) as a core material was broken into fine oil droplets in the dispersed phase to form the (O/W) dispersion. The (O/W) dispersion was poured in the continuous phase (O’) and stirred to form the (O/W)/O’ dispersion at room temperature and then, temperature of the dispersion was raised to 80 °C to prepare curdlan-microcapusles containing β-carotene. In this microencapsulation process, the concentrations of curdlan and oil soluble surfactant and the impeller speed to form the (O/W)/O’ dispersion were mainly changed stepwise. We were able to prepare microcapsules by the microencapsulation method adopted here. The content of core material was increased with the curdlan concentration and decreased with the impeller speed and the oil soluble surfactant concentration. With the curdlan concentration, the drying rate of microcapsules was decreased and the retention ability for water was increased due to the stable preservation of β-carotene.

show abstract

Preparation of polyurea microcapsules containing pyrethroid insecticide with hexamethylene diisocyanate isocyanurate

Cited by 20 publications

References 9 publications

Effect of pH and ionic strength on exposure and toxicity of encapsulated lambda–cyhalothrin to Daphnia magna

Effect of pH and ionic strength on exposure and toxicity of encapsulated lambda–cyhalothrin to Daphnia magna

Direct preparation of gelatin microcapsules on paper surface using simple coacervation technique

Preparation of Microcapsules Containing β-Carotene with Thermo Sensitive Curdlan by Utilizing Reverse Dispersion

Contact Info

Product

Resources

About