Controlled release fertilizer encapsulated by a κ-carrageenan hydrogel

AUTOR(ES)

Rozo, Gladys

FONTE

Polímeros

DATA DE PUBLICAÇÃO

03/10/2019

RESUMO

Abstract The release kinetics of nitrogen and phosphorous of a granulated fertilizer, encapsulated in a κ-carrageenan-based hydrogel (CBH), was evaluated in order to determine its release mechanism given the potential this hydrogel has as coating material for controlled release fertilizers (CFRs). The effect of pH on the release properties was also investigated. The relationship between the NH4+, NO3-, and PO43- release of encapsulated fertilizers and time was determined by short- and long-term laboratory incubations. The mechanism of the release of nutrient ions was determined by comparing the release data with the zero-order, first-order, Higuchi, Hixon-Crowell and Korsmeyer-Peppas kinetic models. The findings showed that the Korsmeyer-Peppas model could be used to describe the release characteristics of the nutrients in the encapsulated fertilizers and that non-Fickian diffusion is the main release mechanism. The experimental hydrogel showed a high water retention capacity able to absorb 300 times its weight water.

Documentos Relacionados

• Effect of potassium chloride and cationic drug on swelling, erosion and release from κ-carrageenan matrices
• Quantitative Determination of the Spatial Distribution of Nitrosomonas europaea and Nitrobacter agilis Cells Immobilized in κ-Carrageenan Gel Beads by a Specific Fluorescent-Antibody Labelling Technique
• Properties of pellets manufactured by wet extrusion/spheronization process using κ-carrageenan: Effect of process parameters
• Preparation and Delayed Release Study on Pancreatin Encapsulated into Alginate, Carrageenan and Pectin Hydrogels
• Conducting polymer- hydrogel blends for electrochemically controlled drug release devices