Polymer/Layered Silicate Nanocomposite as Matrix for Bioinsecticide Formulation

Summary Due to current encouragement to the use of bioinsecticides for pest control and the susceptibility of biological agents to external factors, we investigated the use of a polymer nanocomposite (PLN, polymer/ layered silicate nanocomposite) as matrix to encapsulate an entomopathogenic fungus a...

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Bibliographic Details
Published in:	Macromolecular symposia. Vol. 344; no. 1; pp. 14 - 21
Main Authors:	Batista, Diogo P. C., Souza, Rafael da S., Santos-Magalhães, Nereide S., de Sena-Filho, José G., Teodoro, Adenir V., Grillo, Luciano A. M., Dornelas, Camila B.
Format:	Journal Article
Language:	English
Published:	Weinheim Blackwell Publishing Ltd 01-10-2014 Wiley Subscription Services, Inc
Subjects:	bioinsecticide formulation Encapsulation entomopathogenic fungus Formulations Fourier transforms Fungi hydrophilic polymers Infrared spectroscopy Nanocomposites Nanostructure Pests silicas Silicates Spectrum analysis
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Summary:	Summary Due to current encouragement to the use of bioinsecticides for pest control and the susceptibility of biological agents to external factors, we investigated the use of a polymer nanocomposite (PLN, polymer/ layered silicate nanocomposite) as matrix to encapsulate an entomopathogenic fungus active against pest insects of palm trees. The beads were formed by extrusion and the following variables were assessed: fungus conidial concentration (series 1: 107; series 2: 108 and series 3: 109 conidia/mL) and nanolayered silicate concentration (0; 0.5; 1; 2 and 4%). The matrix was evaluated by X‐ray powder diffraction and Fourier transform infrared spectroscopy and the following characteristics of the products were assessed: percent of encapsulated conidia, size distribution and polydispersity index, swelling index, formulation's in vitro ability to release conidia and stability under different storage temperatures. PLN, whose interactions could be visualized by FTIR, proved to be a potential matrix for this fungus, because, while composed by natural substances non‐toxic to the environment, it succeeded to encapsulate high amounts of conidia (series 2). A barrier effect with bentonite increase was also demonstrated by increased fungus germination time and thermal stability.
Bibliography:	istex:F4D5611CBD052A325FE8EB218CA516410A144089 ArticleID:MASY201300208 ark:/67375/WNG-GGXKDGKB-1 Brazilian Agricultural Research Corporation (EMBRAPA) and Foundation Research of the State of Alagoas (FAPEAL) ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1022-1360 1521-3900
DOI:	10.1002/masy.201300208