PHB and Montmorillonite Clay Composites as KNO3 and NPK Support for a Controlled Release

Souza, J. L.; Campos, Adriana de; França, Débora; Faez, Roselena

doi:10.1007/s10924-019-01498-9

Cited by 16 publications

(15 citation statements)

References 31 publications

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“…Characteristic absorption bands for PHA in the C–O–C and C–C stretching and CH deformation mode regions (1300–1000 cm –1 ) overlap with P–O and PO stretches (1300–1100 cm –1 ) characteristic of Ca–P (Figure S5). ,, This overlap and the low concentration of Ca–P–NPs prevent spectral identification of their inclusion in the PNCs.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Analyzing the possible interaction points of the material components, we have assumed that NO 3 − interacts with the hydroxyl groups of starch while K + ions are attracted by the groups −CO. It could justify the more prolonged release of the nutrient and the nitrate role as a matrix plasticizer, 38 as observed in torque analysis (Figure 3). When comparing the infrared spectra, it was possible to observe that the materials with the CNF microspheres were different and that the CO was more evident to be close to 1600 cm −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Biobased Poly(3-hydroxybutyrate)/Starch/Cellulose Nanofibrils for Nutrients Coatings

França

Angelo

Souza

et al. 2021

ACS Appl. Polym. Mater.

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The coating of nutrients to obtain enhanced efficiency fertilizer (EEF) is a common practice in agriculture. The material used as a matrix to coat or carry nutrients on the EEFs must be nutrient compatible, control the release, degrade after use, and be harmless to the environment. The present study aims at the preparation of a sustainable matrix based on natural and biodegradable polymers. First, cellulose nanofibrils (CNFs) have encapsulated potassium nitrate nutrients through spray drying, producing microparticles. Then, the polymeric matrix based on thermoplastic starch (TPS) and poly (3-hydroxybutyrate) (PHB) has coated the CNF-KNO3 microparticles by a melting process. The chemical and physical characterization and the biodegradation evaluation have ensured that the matrices are harmless to the environment. The nutrient release tests have evaluated the effectiveness of the matrix in postponing nutrient discharge. The matrix has first released the nutrient (first three days) and then started to degrade (the 7th day’s peak of biodegradation). All matrix formulations have shown to be biodegradable, and the EEF based on PHB, TPS, and CNF showed the highest levels of biodegradation. Characteristics attributed to CNFs and TPS effect on the degradation processes. Thereby, sustainable matrices for the enhanced efficiency fertilizers based on PHB, starch, and cellulose nanofibrils are feasible to be obtained and applied.

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“…A liberação dos nutrientes em água segue uma metodologia já estabelecia no grupo de pesquisa, Figura 4 (FRANÇA et al, 2018;FAEZ, 2019;SOUZA et al, 2019). Microesferas de CS/micronutriente (0,5 g) foram condicionadas em um sachê semipermeável de TNT (7 x 5 cm) e imergidos em um volume de 50 mL de água destilada.…”

Section: Liberação Em áGua Dos Micronutrientesunclassified

“…Além disso, o PVA é um polímero termoplástico de difícil processamento (TANG; ALAVI, 2011).Para solucionar-se este problema, a principal alternativa é o uso de plastificantes, que diminuem as forças intermoleculares entre as cadeias, tendo como consequência a redução da temperatura de fusão do polímero. Na literatura o plastificante mais utilizado é o glicerol, mas o mesmo foi apontado como um possível contaminante do solo, dificultado o crescimento das plantas(RYCHTER et al, 2016;TANG;ALAVI, 2011). Dessa forma, propôs-se também avaliar a combinação de glicerol e água (1:1) e uso da ureia ou a combinação de ureia e água (1:1) como agente plastificante.Em relação ao perfil de torque obtido, Figura 15, ao se adicionar o PVA + plastificante à câmara de mistura, há um aumento do torque durante 1 min 30 s, relacionado à força necessária para os rotores girarem e cisalharem o material.…”

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“…Misturar o KNO3 à matriz antes do processamento diminuiu o valor de torque, o que significa menor viscosidade, condição favorável para incorporação do nutriente. Trabalhos anteriores do grupo mostraram que o KNO3 pode atuar como plastificante de PHB(FRANÇA et al, 2021;SOUZA et al, 2019). Figura 25 (b e c) mostra o aspecto dos materiais obtidos ao final do processamento.…”

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Desenvolvimento de materiais contendo macro e micronutrientes para liberação programada: uma agricultura sustentável

Chiaregato¹

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Desenvolvimento de materiais contendo macro e micronutrientes para liberação programada: uma agricultura sustentávelPirassununga Bascote® e Multi/M, pois interagiam pouco com a matriz de solo, comparado com a formulação Macro. A formulação Multi/M apresentou perfil de liberação semelhante 8 ao material comercial Basacote®, o que demostra a potencialidade do material para a aplicação como EEFs, além de ser à base de materiais que possuem potencial de biodegradação.

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PHB and Montmorillonite Clay Composites as KNO3 and NPK Support for a Controlled Release

Cited by 16 publications

References 31 publications

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

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

Biobased Poly(3-hydroxybutyrate)/Starch/Cellulose Nanofibrils for Nutrients Coatings

Desenvolvimento de materiais contendo macro e micronutrientes para liberação programada: uma agricultura sustentável

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