Green Composite Based on PHB and Montmorillonite for KNO3 and NPK Delivery System

Souza, Josiane de; Chiaregato, Camila Gruber; Faez, Roselena

doi:10.1007/s10924-017-0979-4

Cited by 28 publications

(20 citation statements)

References 47 publications

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“…In this mathematical study, the Korsmeyer-Peppas model was used with the aim to determine the release mechanism of the encapsulated compound between three expected mechanisms, Fickian release (diffusion-controlled release), non-Fickian release (anomalous transport), and case II transport (relaxation-controlled release) [20,21].…”

Section: Zero-order Model Ismentioning

confidence: 99%

“…e use of the Korsmeyer-Peppas model requires the determination of exponent n; accordingly, it is suggested to use only the first 60% of the substance release data. e n value determined generally used to distinguish between the three mechanisms issued previously, in which Fickian release is verified at the n value less than 0.43, while the non-Fickian release mechanism is established where the n value is between 0.43 and 0.85, although the n value higher than 0.85 indicates the case II transport release [20][21][22]. Using Ori-ginPro 2018 software, the calculation of the squared correlation coefficient (R 2 ) was used to confirm the accuracy of those models.…”

Section: Zero-order Model Ismentioning

confidence: 99%

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Influence of Sodium Alginate Concentration on Microcapsules Properties Foreseeing the Protection and Controlled Release of Bioactive Substances

Brahmi

Berraaouan

Ed-Daoui

et al. 2021

Journal of Chemistry

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To understand the abilities of Ca-alginate microcapsules and their specific applications in different fields, it is necessary to determine the physicochemical and structural properties of those formulated microcapsules. In this work, we aimed to study the effect of alginate concentration in the improvement of the encapsulation efficiency (EE) and on the release of phenolic and flavonoid substances. The relationship between the structure of the encapsulated bioactive substance and Ca-alginate network and their effect on the EE and release kinetics have been investigated. The incorporation, structure, morphology, and phase properties of all elaborated materials were characterized by UV-spectroscopy, Fourier transform infrared (ATR-FTIR), scanning electron microscope (SEM), and X-ray diffraction (DRX). The results indicate that increasing the polymer concentration increases the EE and decreases the loading capacity (LC), whereas the effect of alginate polymer concentration on the release was not observed. The release study of bioactive substances showed that the release kinetics is relatively dependent on the structure and the physicochemical characteristics of the bioactive substance, which became clear when the encapsulated compounds were released from the core of calcium alginate microcapsules. Thus, it could be concluded that the pores size of the Ca-alginate network is smaller than the volume of the crocin molecule (2794.926 Å3) and higher than the volume of the gallic acid molecule (527.659 Å3). For the same microcapsules system, the release mechanism is affected by the structure and physicochemical properties of the encapsulated molecules.

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Section: Zero-order Model Ismentioning

confidence: 99%

Section: Zero-order Model Ismentioning

confidence: 99%

Influence of Sodium Alginate Concentration on Microcapsules Properties Foreseeing the Protection and Controlled Release of Bioactive Substances

Brahmi

Berraaouan

Ed-Daoui

et al. 2021

Journal of Chemistry

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“…where Q represents the fraction released at t(min), k p is the rate constant, and n is the diffusional exponent, indicative of gallic acid release mechanism. Furthermore, the Korsmeyer-Peppas model was employed in the active compound release behavior analysis of these formulations to distinguish between the competing release mechanisms such as Fickian release (diffusion-controlled release), non-Fickian release (anomalous transport) and case-II transport (relaxation-controlled release) [35,36].…”

Section: Analysis Of Gallic Acid Release Kinetics and Mechanismmentioning

confidence: 99%

“…The n value between 0.43 and 0.85 is defined as non-Fickian release. When n ≥ 0.85, it is case-II transport [35][36][37]. The prediction ability and accuracy of these models were compared by calculation of the squared correlation coefficient (R 2 ) using OriginPro 2018 software.…”

Section: Analysis Of Gallic Acid Release Kinetics and Mechanismmentioning

confidence: 99%

Optimization of gallic acid encapsulation in calcium alginate microbeads using Box-Behnken Experimental Design

et al. 2020

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The aim of this study was the optimization of the gallic acid (GA) encapsulation efficiency within calcium alginate microparticles by the ionotropic gelation technique, using Box-Behnken design for the surface methodology response. For this purpose, three independent variables were selected: sodium alginate concentration (X1), calcium chloride concentration (X2), and gallic acid concentrations (X3). The influence of each variable on the encapsulation efficiency was evaluated. The optimum conditions to reach maximum encapsulation efficiency were found to be: X1 = 30 g/l (3%, w/v), X2 = 21.63 g/l (2.163%, w/v) and X3 = 15 g/l (1.5%, w/v), respectively. The encapsulation efficiency was determined to be 42.8%. The obtained microbeads were further examined using differential scanning calorimetry (DSC) and Fourier transform infrared (ATR-FTIR), and the inclusion of gallic acid was confirmed. The gallic acid concentration (X3) is the statistically significant factor in the optimization process. In addition, no autoxidation of the gallic acid compound was observed in the formulated calcium alginate microbeads. Scanning electron microscope (SEM) analysis showed that the shape of the particle was spherical for all formulations and their surface is wrinkled. The release study of the gallic acid carried out in an aqueous medium at pH value 6.8, showed that the GA release pattern was fast for all systems studied (85% at 20 min), and the profile of the release was influenced by the size of the calcium alginate microbeads. The obtained results reveal that the calcium alginate microbeads prepared through the ionotropic gelation technique possess great prominent for gallic acid encapsulation as well as its liberation.

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“…The ultimate utility of these materials depends on how well they support plant performance; however, there are few available plant-based studies and those that have been published are on short time scales . Many studies only examine nutrient release in well-controlled laboratory settings (e.g., water), without probing the more complex and dynamic interplay that may exist in true agricultural settings, including the effects of soil factors and microbial activity. ,,− Moreover, many studies rely on complex and costly polymer synthesis procedures that are not amenable to scaling and commercialization. , …”

Section: Introductionmentioning

confidence: 99%

Biodegradable Polymer Nanocomposites Provide Effective Delivery and Reduce Phosphorus Loss during Plant Growth

Sigmon

Adisa

Liu

et al. 2021

ACS Agric. Sci. Technol.

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Although phosphorus (P) is an essential element, its availability to plants is often limited, and P-containing fertilizers must be supplemented to stimulate plant performance. However, the inefficiencies and negative environmental impacts associated with current nutrient delivery strategies have motivated interest in nanotechnology-enabled agriculture. Here, we synthesized biodegradable polymer nanocomposites (PNCs) containing polyhydroxyalkanoate (PHA) and calcium phosphate nanoparticles (Ca–P–NPs) and assessed their efficacy as a P-delivery vehicle, compared to a conventional P source (CaHPO4), using tomato as a test plant. The effectiveness of PHA–Ca–P PNCs was assessed by measuring plant biomass, fruit yield and quality, tissue elemental and chlorophyll content, and enzymatic biomarkers. Phosphorus in the leachate was used as a surrogate for runoff. PHA–Ca–P PNCs biodegraded as a result of microbial activity in the soil, controlling the release of P during the initial stages of plant growth. PHA–Ca–P PNCs supported plant performance comparably to the conventional P source, while significantly reducing the P loss from the soil by over 80%. Given the negative consequences of eutrophication driven by P-rich agricultural runoff, this significant reduction in lost P has broad implications. Our studies also highlight the need to improve the efficiency of P uptake by plants from exogenous P sources. Collectively, these findings demonstrate the significant potential of biodegradable PNCs as a nutrient delivery platform to simultaneously enhance crop productivity and reduce the negative impacts of agriculture on the environment.

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Green Composite Based on PHB and Montmorillonite for KNO3 and NPK Delivery System

Cited by 28 publications

References 47 publications

Influence of Sodium Alginate Concentration on Microcapsules Properties Foreseeing the Protection and Controlled Release of Bioactive Substances

Influence of Sodium Alginate Concentration on Microcapsules Properties Foreseeing the Protection and Controlled Release of Bioactive Substances

Optimization of gallic acid encapsulation in calcium alginate microbeads using Box-Behnken Experimental Design

Biodegradable Polymer Nanocomposites Provide Effective Delivery and Reduce Phosphorus Loss during Plant Growth

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