Preparation of Sodium Carboxymethly Cellulose Hydrogels for Controlled Release of Copper Micronutrient

Abstract

In this study, a series of nanoporous sodium carboxymethyl cellulose (NaCMC) hydrogels were synthesized using FeCl₃ ionic-crosslinker by changing the amounts of the components. Hydrogel formation percentages of the samples were determined and the highest value was obtained as 96% for the hydrogel containing the most amounts of polymer and crosslinker. Swelling/degradation behaviors of the hydrogels were studied by changing time, temperature and pH and it was determined that the swelling percentages regularly decreased with increasing the amounts of polymer and crossliker. S% values were determined to be 102% for the least swollen hydrogel. In general, NaCMC hydrogels much more swelled in basic medium than acidic medium. Releasing of copper micronutrient from NaCMC hydrogels were investigated by Atomic Absorption Spectrometer measurements.  Kinetic in vitro release parameters, the release rate factor K and the release exponent n of micronutrients in hydrogel system were calculated. It can be concluded that the produced hydrogel system having controllable release values is useful for agricultural applications. 

Keywords

• Sodium carboxymethyl cellulose,Hydrogel,Micronutrient,Controlled-release

References

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