<scp>pH</scp>sensitive phosphate crosslinked films of starch‐carboxymethyl cellulose

Cagnin, Caroline; Simões, Bruno Matheus; Yamashita, Fábio; Carvalho, Gizilene Maria de; Grossmann, Maria Victória Eiras

doi:10.1002/pen.25582

Cited by 18 publications

(9 citation statements)

References 34 publications

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“…In DXE, the peak at 1740 cm –1 was assigned to the stretching vibrations of the −CO group of the ester linkage formed between dextrin and lauroyl moieties. On the other hand, in PDXE MGs, the appearance of additional peaks at 1230 and 833 cm –1 apart from other characteristic peaks of DXE corresponded to −PO and −C–O–P bond vibrations, respectively, indicating that DXE was successfully combined with STP. , Next, to check the successful loading of urea in the PDXE MGs, FTIR spectra of both bare urea and Urea@PDXE MGs were recorded. Here, characteristic peaks of urea were observed at 1675 and 1463 cm –1 owing to the stretching vibration of −CO, −C–N bond.…”

Section: Resultsmentioning

confidence: 99%

Biodegradable Dextrin-Based Microgels for Slow Release of Dual Fertilizers for Sustainable Agriculture

Dhiman,

Thaper,

Bhardwaj

et al. 2024

ACS Appl. Mater. Interfaces

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In this research, we report dextrin-based biodegradable microgels (PDXE MGs) having phosphate-based cross-linking units for slow release of urea and a potential P source to improve fertilization. PDXE MGs (∼200 nm) are synthesized by crosslinking the lauroyl-functionalized dextrin chains with sodium tripolyphosphate. The developed PDXE MGs exhibit high loading (∼10%) and encapsulation efficiency (∼88%) for urea. It is observed that functionalization of PDXE MGs with lauroyl chains slows down the release of urea (90% in ∼24 days) as compared to nonfunctionalized microgels (PDX MGs) (99% in ∼17 days) in water. Further studies of the developed formulation display that Urea@PDXE MGs significantly boost maize seed germination and overall plant growth as compared to pure urea fertilizer. Moreover, analysis of maize leaves obtained from plants treated with Urea@PDXE MGs reveals 3.5 ± 0.3% nitrogen content and 90 ± 0.7 mg/ g chlorophyll content. These values are significantly higher than 1.4 ± 0.6% nitrogen content and 48 ± 0.05 mg/g chlorophyll content obtained by using bare urea. Further, acid phosphatase activity in roots is reduced upon treatment with PDXE MGs and Urea@PDXE MGs, suggesting the availability of P upon degradation of PDXE MGs by the amylase enzyme in soil. These experimental results present the developed microgel-based biodegradable formulation with a slow release feature as a potential candidate to move toward sustainable agriculture practices.

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Section: Resultsmentioning

confidence: 99%

Biodegradable Dextrin-Based Microgels for Slow Release of Dual Fertilizers for Sustainable Agriculture

Dhiman,

Thaper,

Bhardwaj

et al. 2024

ACS Appl. Mater. Interfaces

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“…It was noticed that the O-CMC–PEG −6% needed more time (~ 90 min) to reach the equilibrium WA than the other three samples (~ 60 min), which should be attributed to the homogeneous structure produced by crosslinking and high component compatibility. While with the increase of crosslinking degree in the composites (O-CMC–PEG −9% and O-CMC–PEG −12% ), the high PEG content resulted in microphase separation, which generated free space to allow water molecules to easily permeate the materials 48 . Based on values of equilibrium WA, it could be found the water sensitivity of the composites mainly depended on the crosslinking degree, that is, the crosslinking was an effective strategy to improve their water resistance.…”

Section: Resultsmentioning

confidence: 99%

PEG-crosslinked O-carboxymethyl chitosan films with degradability and antibacterial activity for food packaging

Yang,

Liu,

Gao

et al. 2024

Sci Rep

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This study developed a kind of PEG-crosslinked O-carboxymethyl chitosan (O-CMC–PEG) with various PEG content for food packaging. The crosslinking agent of isocyanate-terminated PEG was firstly synthesized by a simple condensation reaction between PEG and excess diisocyanate, then the crosslink between O-carboxymethyl chitosan (O-CMC) and crosslinking agent occurred under mild conditions to produce O-CMC–PEG with a crosslinked structure linked by urea bonds. FT-IR and 1H NMR techniques were utilized to confirm the chemical structures of the crosslinking agent and O-CMC–PEGs. Extensive research was conducted to investigate the impact of the PEG content (or crosslinking degree) on the physicochemical characteristics of the casted O-CMC–PEG films. The results illuminated that crosslinking and components compatibility could improve their tensile features and water vapor barrier performance, while high PEG content played the inverse effects due to the microphase separation between PEG and O-CMC segments. The in vitro degradation rate and water sensitivity primarily depended on the crosslinking degree in comparison with the PEG content. Furthermore, caused by the remaining –NH2 groups of O-CMC, the films demonstrated antibacterial activity against Escherichia coli and Staphylococcus aureus. When the PEG content was 6% (medium crosslinking degree), the prepared O-CMC–PEG−6% film possessed optimal tensile features, high water resistance, appropriate degradation rate, low water vapor transmission rate and fine broad-spectrum antibacterial capacity, manifesting a great potential for application in food packaging to extend the shelf life.

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“…Porous material produced by extrusion typically displays irregular pore size [23,24,36]. The microtomography presented in Fig.…”

Section: Microtomography and Porositymentioning

confidence: 99%

Starch-cellulose-gelatin hydrogels obtained by reactive extrusion aiming an ecologically friendly perspective

MARIM,

Pereira,

Andrello

et al. 2023

Preprint

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Biopolymeric hydrogels represent a versatile class of materials with a wide range of potential applications, including their use in agricultural materials, drug delivery systems, biosensors, and food packaging. This investigation primarily centered on the synthesis and characterization of biodegradable hydrogels based on starch, cellulose, and gelatin, acting as a polymeric matrix intended for water retention in agricultural contexts. Prior to their incorporation into the hydrogels formulations, cassava starch and cellulose extracted from oat hulls underwent modification via reactive extrusion involving reaction with citric acid (CA) and sodium trimetaphosfate (STMP) as crosslinking agents, respectively. The hydrogels were obtained through a reactive extrusion process to produce porous pellets. These pellets were characterized according to their porosity, thermal properties, degree of swelling at different times and pHs, and water adsorption capacities. The hydrogel sample formulated with both CA-modified starch and STMP-modified cellulose, and gelatin, presented the highest values of porosity (> 45%) and open pores (> 5%), and the higher degree of swelling (607%). These materials as promising candidates for application in agriculture to increase water and/or fertilizers retention capacity in soil, with important advantages, including their biodegradability and low toxicity. It is worth mentioning that the reactive extrusion process used is a continuous process, with low effluent generation and scalable for large-scale production.

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pHsensitive phosphate crosslinked films of starch‐carboxymethyl cellulose

Cited by 18 publications

References 34 publications

Biodegradable Dextrin-Based Microgels for Slow Release of Dual Fertilizers for Sustainable Agriculture

Biodegradable Dextrin-Based Microgels for Slow Release of Dual Fertilizers for Sustainable Agriculture

PEG-crosslinked O-carboxymethyl chitosan films with degradability and antibacterial activity for food packaging

Starch-cellulose-gelatin hydrogels obtained by reactive extrusion aiming an ecologically friendly perspective

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