Abstract
In our research group, controlled release systems for the sulfentrazone herbicide has been accomplished by encapsulating this bioactive compound into calcium alginate (Ca-ALG) biodegradable polymer fashion and the release mechanisms were verified by using Korsmeyer-Peppas model (KP). However, the KP model does not allow to evaluate all the phenomena involved in the (Mt/M∞ versus t) curves. Thus, the aim of this work is the development of a new mathematical model to interpret the distinct regions of the controlled release assays of the Sulfentrazone herbicide encapsulated in Ca-ALG microparticles and that can be used for other systems with a similar release profile. The proposed model is based on the herbicide diffusion, dissolution and polymer surface erosion. The results show that the proposed model is closest to the experimental curve when compared to the KP. The new mathematical model allows not just to describe the behavior of the system in terms of Fick’s law, but to know what type of mechanism act in the herbicide release process.
Highlights
The increase of world agriculture in productivity and cultivated areas occurs due to the adhesion of new technologies, such as the use of fertilizers, densified plantings, diffusion of transgenic plants and especially the use of agricultural pesticides 1
We studied experimentally the release assays of sulfentrazone herbicide encapsulated into calcium alginate (Ca-ALG) microparticles for weed control
The experimental data points obtained for the release in time were adjusted by the Korsmeyer-Peppas model (KP) model, which is an equation commonly employed for linearization of release data of unknown mechanism
Summary
The increase of world agriculture in productivity and cultivated areas occurs due to the adhesion of new technologies, such as the use of fertilizers, densified plantings, diffusion of transgenic plants and especially the use of agricultural pesticides 1. The sulfentrazone, N-{2,4-Dichloro-5-[4-(difluoromethyl)3-methyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl]phenyl} methanesulfonamide, is a pre-emergent herbicide of the aryltriazolinones group, which acts by inhibiting the enzyme protoporphyrinogen oxidase, an important intermediate in the synthesis of chlorophyll in plants 9 and may be applied in the conventional cultivation as in no-tillage system and used to weed control and some grasses in crops such as soybean 10, chickpeas, sugarcane 11 and rice 12. Due to their intensive use, herbicides are often detected in surface and groundwater quality studies 13.
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