pH-responsive eco-friendly chitosan modified cenosphere/alginate composite hydrogel beads as carrier for controlled release of Imidacloprid towards sustainable pest control

Singh, Amrita; Kar, Aditya K.; Singh, Divya; Verma, Rajendra Kumar; Shraogi, Nikita; Zehra, Alina; Gautam, Krishna; Anbumani, Sadasivam; Ghosh, Debabrata; Patnaik, Satyakam

doi:10.1016/j.cej.2021.131215

Cited by 74 publications

(31 citation statements)

References 73 publications

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“…Relating our results to our previous studies with PA12_ZrO 2 , for PA12_Al 2 O 3, we observed the following phenomena. Compared with previous studies on zirconia and alumina, the present samples from the CSs had a higher initial hardness (PA12_ZrO 2 -11 HV, PA12_Al 2 O 3 -17 HV) [42]. On the other hand, the hardness values after 29 days in SBF were PA12_ZrO 2 , 19 HV; PA12_ZrO 2 , 19 HV; and PA12_Al 2 O 3 , 12 HV [44].…”

Section: Discussioncontrasting

confidence: 83%

“…Relating our results to our previous studies with PA12_ZrO2, for PA12_Al2O3, we observed the following phenomena. Compared with previous studies on zirconia and alumina, the present samples from the CSs had a higher initial hardness (PA12_ZrO2-11 HV, PA12_Al2O3-17 HV) [42]. On the other hand, the The samples after the soaking tests were subjected to mechanical tests to confirm the influence of SBF on potential aging under real conditions.…”

Section: Discussionmentioning

confidence: 52%

“…The manner of their surface modification is also important as it helps to avoid phase separation [40]. These composites with these kinds of fillers are also part of sustainable technology [41,42].…”

Section: Introductionmentioning

confidence: 99%

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Cenospheres-Reinforced PA-12 Composite: Preparation, Physicochemical Properties, and Soaking Tests

et al. 2022

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The main aim of this research was the preparation of a polymer–ceramic composite with PA-12 as the polymer matrix and modified aluminosilicate cenospheres (CSs) as the ceramic filler. The CSs were subjected to an early purification and cleaning process, which was also taken as a second objective. The CSs were surface modified by a two-step process: (1) etching in Piranha solution and (2) silanization in 3-aminopropyltriethoxysilane. The composite was made for 3D printing by FDM. Raw and modified CSs and a composite with PA-12 were subjected to the following tests: surface development including pores (BET), real density (HP), chemical composition and morphology (SEM/EDS, FTIR), grain analysis (PSD), phase composition (XRD), hardness (HV), and static tensile tests. The composites were subjected to soaking under simulated body fluid (SBF) conditions in artificial saliva for 14, 21, and 29 days. Compared to pure PA-12, PA-12_CS had generally better mechanical properties and was more resistant to SBF at elevated temperatures and soaking times. These results showed this material has potential for use in biomedical applications. These results also showed the necessity of developing a kinetic aging model for aging in different liquids to verify the true value of this material.

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Section: Discussioncontrasting

confidence: 83%

“…Relating our results to our previous studies with PA12_ZrO2, for PA12_Al2O3, we observed the following phenomena. Compared with previous studies on zirconia and alumina, the present samples from the CSs had a higher initial hardness (PA12_ZrO2-11 HV, PA12_Al2O3-17 HV) [42]. On the other hand, the The samples after the soaking tests were subjected to mechanical tests to confirm the influence of SBF on potential aging under real conditions.…”

Section: Discussionmentioning

confidence: 52%

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Cenospheres-Reinforced PA-12 Composite: Preparation, Physicochemical Properties, and Soaking Tests

et al. 2022

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“…Singh et al [41] recently reported that IMD at 2.35 mM reduces HaCaT cells viability below 50%, when exposed for 24 h. This value is 4.74-fold higher than the one reported in our research (Table 1), which can be explained by the difference in cell density per well. Regarding HepG2, Guimarães et al [42] reported that IMD dose-dependently reduced cell viability in the range of 0.5-2.0 mM or 0.25-2.0 mM, for 24 h or 48 h exposure, respectively, values well aligned with the IMD toxicity against HepG2 cells (Table 1).…”

Section: Discussioncontrasting

confidence: 82%

In Vitro Assessment of Pesticides Toxicity and Data Correlation with Pesticides Physicochemical Properties for Prediction of Toxicity in Gastrointestinal and Skin Contact Exposure

Silva

Martins-Gomes

Silva

et al. 2022

Toxics

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In this work, three pesticides of different physicochemical properties, namely, glyphosate (herbicide), imidacloprid (insecticide) and imazalil (fungicide), were selected to assess their cytotoxicity against distinct cell models (Caco-2, HepG2, A431, HaCaT, SK-MEL-5 and RAW 264.7 cells) to mimic gastrointestinal and skin exposure with potential systemic effect. Cells were subjected to different concentrations of selected pesticides for 24 h or 48 h. Cell viability was assessed by Alamar Blue assay, morphological changes by bright-field microscopy and the IC50 values were calculated. Cytotoxic profiles were analysed using the physico-chemical parameters of the pesticides, namely: molecular weight, water solubility, the partition coefficient in the n-octanol/water (Log Pow) system, the topological polar surface area (TPSA), and number of hydrogen-bonds (donor/acceptor) and rotatable bonds. Results showed that glyphosate did not reduce cell viability (up to 1 mM), imidacloprid induced moderate toxicity (IC50 > 1 mM for Caco-2 cells while IC50 = 305.9 ± 22.4 μM for RAW 264.7 cells) and imazalil was highly cytotoxic (IC50 > 253.5 ± 3.37 for Caco-2 cells while IC50 = 31.3 ± 2.7 μM for RAW 264.7 cells) after 24 h exposure. Toxicity was time-dependent as IC50 values at 48 h exposure were lower, and decrease in cell viability was accompanied by changes in cell morphology. Pesticides toxicity was found to be directly proportional with their Log Pow, indicating that the affinity to a lipophilic environment such as the cell membranes governs their toxicity. Toxicity is inverse to pesticides TPSA, but lower TPSA favours membrane permeation. The lower toxicity against Caco-2 cells was attributed to the physiology and metabolism of cell barriers equipped with various ABC transporters. In conclusion, physicochemical factors such as Log Pow, TPSA and H-bond are likely to be directly correlated with pesticide-induced toxicity, thus being key factors to potentially predict the toxicity of other compounds.

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“…Thermal stability was analyzed by a comparison of the TGA curve between GO, Pyr and GO–Pyr nanocomposite ( Figure 3 ). It can be observed that the weight loss of GO at 200 °C was 19.43%; the weight loss of Pyr at 200 °C was 2.87%; while that of GO–Pyr was only about 5%, suggesting that GO–Pyr nanocomposite had a higher thermal stability than GO while lower thermal stability than Pyr [ 44 ]. This phenomenon can be attributed to the weight loss of oxygen-containing functional groups in GO.…”

Section: Resultsmentioning

confidence: 99%

Nanopesticide Formulation from Pyraclostrobin and Graphene Oxide as a Nanocarrier and Application in Controlling Plant Fungal Pathogens

et al. 2022

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Efficient and environment-friendly nanopesticide delivery systems are critical for the sustainable development of agriculture. In this study, a graphene oxide nanocomposite was developed for pesticide delivery and plant protection with pyraclostrobin as the model pesticide. First, graphene oxide–pyraclostrobin nanocomposite was prepared through fast adsorption of pyraclostrobin onto graphene oxide with a maximum loading of 87.04%. The as-prepared graphene oxide–pyraclostrobin nanocomposite exhibited high stability during two years of storage, suggesting its high potential in practical application. The graphene oxide–pyraclostrobin nanocomposite could achieve temperature (25 °C, 30 °C and 35 °C) and pH (5, 7 and 9) slow-release behavior, which overcomes the burst release of conventional pyraclostrobin formulation. Furthermore, graphene oxide–pyraclostrobin nanocomposite exhibited considerable antifungal activities against Fusarium graminearum and Sclerotinia sclerotiorum both in vitro and in vivo. The cotoxicity factor assay revealed that there was a synergistic interaction when graphene oxide and pyraclostrobin were combined at the ratio of 1:1 against the mycelial growth of Fusarium graminearum and Sclerotinia sclerotiorum with co-toxicity coefficient values exceeding 100 in vitro. The control efficacy of graphene oxide–pyraclostrobin nanocomposite was 71.35% and 62.32% against Fusarium graminearum and Sclerotinia sclerotiorum in greenhouse, respectively, which was higher than that of single graphene oxide and pyraclostrobin. In general, the present study provides a candidate nanoformulation for pathogenic fungal control in plants, and may also expand the application of graphene oxide materials in controlling plant fungal pathogens and sustainable agriculture.

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pH-responsive eco-friendly chitosan modified cenosphere/alginate composite hydrogel beads as carrier for controlled release of Imidacloprid towards sustainable pest control

Cited by 74 publications

References 73 publications

Cenospheres-Reinforced PA-12 Composite: Preparation, Physicochemical Properties, and Soaking Tests

Cenospheres-Reinforced PA-12 Composite: Preparation, Physicochemical Properties, and Soaking Tests

In Vitro Assessment of Pesticides Toxicity and Data Correlation with Pesticides Physicochemical Properties for Prediction of Toxicity in Gastrointestinal and Skin Contact Exposure

Nanopesticide Formulation from Pyraclostrobin and Graphene Oxide as a Nanocarrier and Application in Controlling Plant Fungal Pathogens

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