Synthesis and characterization of a novel (salep phosphate)-based hydrogel as a carrier matrix for fertilizer release

Salep phosphate modified biopolymers with different phosphate contents were prepared via reacting salep (a multi-component polysaccharide obtained from dried tubers of certain natural terrestrial orchids) with a solution of primary and secondary sodium phosphates under basic conditions in a semidry...

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Bibliographic Details
Published in:Reactive & functional polymers 2012-10, Vol.72 (10), p.667-672
Main Authors: Pourjavadi, Ali, Doulabi, Malihe, Soleyman, Rouhollah, Sharif, Sepideh, Eghtesadi, Seyed Ali
Format: Article
Language:English
Subjects:
31P NMR spectroscopy
Agronomy. Soil science and plant productions
Applied sciences
Backbone
Biological and medical sciences
Controlled release
Copolymerization
Exact sciences and technology
Fertilizing
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Hydrogel
Hydrogels
Monomers
Natural polymers
Nitrogen, phosphorus, potassium fertilizations
Phosphates
Phosphorylation
Physicochemistry of polymers
Potassium fertilization
Salep phosphate
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Starch and polysaccharides
Swelling
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Summary:Salep phosphate modified biopolymers with different phosphate contents were prepared via reacting salep (a multi-component polysaccharide obtained from dried tubers of certain natural terrestrial orchids) with a solution of primary and secondary sodium phosphates under basic conditions in a semidry process. Structural characterization of salep phosphates were carried out by 31P NMR, FT-IR spectra and TGA curves. Determination of the phosphate content in samples was done by a standard spectrophotometric method. Then, novel (salep phosphate)-based hydrogels were synthesized by graft copolymerization of acrylic acid (AA) monomer onto salep phosphate backbones. Effect of the phosphate contents on swelling rate, equilibrium water absorbency in various pHs and potential of the hydrogels in release of KNO3 fertilizer were investigated. The results indicated that phosphorylation of salep could greatly improve equilibrium water absorbency, swelling rate and fertilizer release behavior of related hydrogels.
ISSN:1381-5148
DOI:10.1016/j.reactfunctpolym.2012.06.010