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Carbohydr Polym ; 202: 409-417, 2018 Dec 15.
Article in English | 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.


Subject(s)
Azospirillum brasilense/drug effects , Chitosan/pharmacology , Crops, Agricultural/growth & development , Drug Delivery Systems , Hydrogel, Polyethylene Glycol Dimethacrylate/pharmacology , Pseudomonas fluorescens/drug effects , Starch/pharmacology , Azospirillum brasilense/metabolism , Chitosan/chemistry , Crops, Agricultural/microbiology , Hydrogel, Polyethylene Glycol Dimethacrylate/chemistry , Particle Size , Pseudomonas fluorescens/metabolism , Starch/chemistry
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