Hybrid humic acid/titanium dioxide nanomaterials as highly effective antimicrobial agents against gram(−) pathogens and antibiotic contaminants in wastewater

Vitiello, Giuseppe; Venezia, Virginia; Verrillo, Mariavittoria; Nuzzo, Assunta; Houston, Judith E.; Cimino, Stefano; D’Errico, Gerardino; Aronne, Antonio; Paduano, Luigi; Piccolo, Alessandro; Luciani, Giuseppina

doi:10.1016/j.envres.2020.110562

Cited by 43 publications

(23 citation statements)

References 69 publications

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“…Tables 2 and 3 list the band assignment in the FT-IR spectra of gelatin and HA, respectively. 48,49 The FT-IR spectra of gelatin and gelatin−HA 8 are similar. This evidence is due to the high amount of gelatin in the sample, which covers the HA FT-IR characteristic bands.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

“…FT-IR analysis was carried out to identify functional groups of gelatin, HA, gelatin–HA, and gelatin–HA mix powders and to assess if any change occurred because of gelatin–HA interactions (Figure a). Tables and list the band assignment in the FT-IR spectra of gelatin and HA, respectively. , The FT-IR spectra of gelatin and gelatin–HA 8 are similar. This evidence is due to the high amount of gelatin in the sample, which covers the HA FT-IR characteristic bands.…”

Section: Resultsmentioning

confidence: 99%

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Adding Humic Acids to Gelatin Hydrogels: A Way to Tune Gelation

et al. 2021

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Exploring the chance to convert biowaste into a valuable resource, this study tests the potential role of humic acids (HA), a class of multifunctional compounds obtained by oxidative decomposition of biomass, as physical agents to improve gelatin’s mechanical and thermal properties. To this purpose, gelatin–HA aqueous samples were prepared at increasing HA content. HA/gelatin concentrations changed in the range 2.67–26.67 (wt/wt)%. Multiple techniques were employed to assess the influence of HA content on the gel properties and to unveil the underlying mechanisms. HAs increased gel strength up to a concentration of 13.33 (wt/wt)% and led to a weaker gel at higher concentrations. FT-IR and DSC results proved that HAs can establish noncovalent interactions through H-bonding with gelatin. Coagulation phenomena occur because of HA–gelatin interactions, and at concentrations greater than 13.33 (wt/wt)%, HAs established preferential bonds with water molecules, preventing them from coordinating with gelatin chains. These features were accompanied by a change in the secondary structure of gelatin, which lost the triple helix structure and exhibited an increase in the random coil conformation. Besides, higher HA weight content caused swelling phenomena due to HA water absorption, contributing to a weaker gel. The current findings may be useful to enable a better control of gelatin structures modified with composted biowaste, extending their exploitation for a large set of technological applications.

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Section: ■ Results and Discussionmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Adding Humic Acids to Gelatin Hydrogels: A Way to Tune Gelation

et al. 2021

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“…Antibacterial activity assays were conducted by: (1) diffusion disk assay, 26 (2) broth microdilution (MIC) method, 27 and (3) agar dilution plate viable-count method. 28 All bacterial strains were kept at −80 °C in Luria Bertani (LB) broth with 20% glycerol, activated by transferring to agar and incubating at 37 °C for 18 h. Preliminary antibacterial screening was performed by testing two Grampositive (Staphylococcus aureus ATCC 6538P and Enterococcus faecalis ATCC 29212) and two Gram-negative bacterial strains (Salmonella typhi ATCC14028 and Escherichia coli ATCC 35218) with a disk diffusion method according to the National Committee for Clinical Laboratory Standards (NCCLS) standard method. This antimicrobial test is based on the different diffusion of the sampling www.soci.org M Verrillo et al…”

Section: Antimicrobial Activitymentioning

confidence: 99%

Valorization of lignins from energy crops and agro‐industrial byproducts as antioxidant and antibacterial materials

et al. 2021

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BACKGROUND Developing eco‐friendly antioxidant and antimicrobial substances originating from biomass residues has recently attracted considerable interest. In this study, two lignosulfonates and various oxidized water‐soluble lignins were investigated for their antioxidant properties, as assessed by ABTS, DPPH and Folin–Ciocalteu methods, and their antimicrobial activity against some bacterial strains responsible for human pathologies. RESULTS The lignosulfonates showed the largest antiradical/antimicrobial capacity, whereas the other substrates were less effective. The observed antioxidant/antibacterial properties were positively correlated with lignin aromatic/phenolic content. The positive correlation between antiradical and antimicrobial activities suggests that lignin scavenging capacity was also involved in its antibacterial activity. A greater antimicrobial performance was generally observed against Gram‐positive bacterial strains, and it was attributed to the intrinsic larger susceptibility of Gram‐positive bacteria to lignin phenols. A significant though lesser inhibitory activity was also found against Escherichia coli. CONCLUSION Our results confirmed the dependence of lignin antioxidant/antibacterial power on its extraction method and chemical structure, as well as on the type of bacterial strains. Identifying the relationship between lignin molecular composition and its antioxidant/antibacterial features represents an advance on the potential future use of renewable and eco‐compatible lignin materials in nutraceutical, pharmaceutical and cosmetic sectors. © 2021 Society of Chemical Industry.

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“…Nanomaterials have a wide range of applications in biotechnology and medicine, such as biosensors, drug delivery, tissue engineering, cancer treatment, and antimicrobial agents [30,[93][94][95][96][97][98]. Cytotoxicity studies are expected for 2DMs to be compatible with proposed biomedical applications [99].…”

Section: Cytotoxicity Studies Of Various 2d Nanomaterialsmentioning

confidence: 99%

A Review on Environmental and Economic Impact of 2D Nanomaterials‐Based Heat Transfer Fluids

Shaik

Goyal

et al. 2022

Journal of Nanomaterials

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2D nanomaterials-based heat transfer fluids show excellent thermal properties due to their large specific surface area; hence, they find large-scale applications in automobile industries and cooling processes. Therefore, it is very essential to study the environmental and economic aspects of these 2D nanomaterial-based nanofluids. In this review, we have discussed the environmental impact of 2D nanomaterial-based heat transfer nanofluids under various conditions. The environmental impact analysis of these materials has shown excellent capability in reducing the energy consumption for heat transfer operations. Moreover, the possibility of nanomaterials and base fluid recovery makes it a sustainable alternative. In addition, health risk assessment on humans, cytotoxicity, and life cycle analysis have also been explored. The price-performance index has been successfully used to study the economic impact of 2D nanomaterial-based heat transfer fluids. The overall economic impact of 2D nanomaterial-based heat transfer nanofluids provides an optimistic perspective over conventional heat transfer fluids. Moreover, graphene production, market trend, and commercialization obstacles were also discussed.

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Hybrid humic acid/titanium dioxide nanomaterials as highly effective antimicrobial agents against gram(−) pathogens and antibiotic contaminants in wastewater

Cited by 43 publications

References 69 publications

Adding Humic Acids to Gelatin Hydrogels: A Way to Tune Gelation

Adding Humic Acids to Gelatin Hydrogels: A Way to Tune Gelation

Valorization of lignins from energy crops and agro‐industrial byproducts as antioxidant and antibacterial materials

A Review on Environmental and Economic Impact of 2D Nanomaterials‐Based Heat Transfer Fluids

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