A novel, green, low-cost chitosan-starch hydrogel as potential delivery system for plant growth-promoting bacteria.
Carbohydr Polym
; 202: 409-417, 2018 Dec 15.
Article
em En
| MEDLINE
| ID: mdl-30287017
ABSTRACT
The study examines the use of macrobeads for the controlled-release of bacteria. Macrobeads were prepared by an easy dripping-technique using 20/80 wt/wt chitosan-starch blends and sodium tripolyphosphate as cross-linking agent. The resulting polymeric matrix was examined by SEM, XRD, TGA, and solid-RMN. The swelling-equilibrium, thermal behaviour, crystallinity, and size of macrobeads were affected by the autoclave-sterilization. The diameter of the sterilized xerogel was c.a. 1.6 mm. The results suggested that ionotropic-gelation and neutralization were the mechanisms underlying hydrogel formation. Plant growth-promoting bacteria (PGPB) were loaded into macrobeads separately or co-inoculated. Bacteria loaded macrobeads were dried and stored. Bacteria survived at least 12 months in orders of 109 CFU of A. brasilense/g and 108 CFU of P. fluorescens/g. Bacterial release in sterile saline solution tended to a super Case-II transport mechanism. Polymeric-matrix release efficiently both PGPB in natural soils, which uncovers their potential for the formulation of novel and improved biofertilizers.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Amido
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Pseudomonas fluorescens
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Azospirillum brasilense
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Sistemas de Liberação de Medicamentos
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Produtos Agrícolas
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Hidrogel de Polietilenoglicol-Dimetacrilato
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Quitosana
Tipo de estudo:
Health_economic_evaluation
Idioma:
En
Revista:
Carbohydr Polym
Ano de publicação:
2018
Tipo de documento:
Article