Metal–Polysaccharide Interplay: Beyond Metal Immobilization, Graphenization‐Induced‐Anisotropic Growth

Kadib, Abdelkrim El

doi:10.1002/cssc.201501609

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…It is a high molecular weight poly-cationic polymer, the second most abundant polysaccharide in nature, and is present in the structural exoskeleton of insects, crustaceans, mollusks, cell walls of fungi, and certain algae, but largely obtained from marine crustaceans [30]. Several gigatons of crustacean shell are produced annually and the extraction of chitin (10 6 –10 7 tons), chitosan, and protein from this waste has added value [31,32]. It has antimicrobial properties against bacteria, filamentous fungi, and yeast, and even has virus, anti-inflammatory, antitumor activity, antioxidative activity, anticholesterolemic, hemostatic, and analgesic effects [33,34].…”

Section: Chitosanmentioning

confidence: 99%

The Role of Chitosan as a Possible Agent for Enteric Methane Mitigation in Ruminants

Jiménez-Ocampo

Valencia-Salazar

Pinzón-Díaz³

et al. 2019

Animals

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Simple SummaryRuminant husbandry is one the largest contributors to greenhouse gas emissions from the agriculture sector, particularly of methane gas, which is a byproduct of the anaerobic fermentation of structural and non-structural carbohydrates in the rumen. Increasing the efficiency of production systems and decreasing its environmental burden is a global commitment, thus methane mitigation is a strategy in which to reach these goals by rechanneling metabolic hydrogen (H2) into volatile fatty acids (VFA) to reduce the loss of energy as methane in the rumen, which ranges from 2% (grain rations) to 12% (poor-quality forage rations) of gross energy intake. A strategy to achieve that goal may be through the manipulation of rumen fermentation with natural compounds such as chitosan. In this review, we describe the effects of chitosan on feed intake and rumen fermentation, and present some results on methanogenesis. The main compounds with antimethanogenic properties are the secondary metabolites, which are generally classified into five main groups: saponins, tannins, essential oils, organosulfurized compounds, and flavonoids. Novel compounds of interest include chitosan obtained by the deacetylation of chitin, with beneficial properties such as biocompatibility, biodegradability, non-toxicity, and chelation of metal ions. This compound has shown its potential to modify the rumen microbiome, improve nitrogen (N) metabolism, and mitigate enteric methane (CH4) under some circumstances. Further evaluations in vivo are necessary at different doses in ruminant species as well as the economic evaluation of its incorporation in practical rations.AbstractLivestock production is a main source of anthropogenic greenhouse gases (GHG). The main gases are CH4 with a global warming potential (GWP) 25 times and nitrous oxide (N2O) with a GWP 298 times, that of carbon dioxide (CO2) arising from enteric fermentation or from manure management, respectively. In fact, CH4 is the second most important GHG emitted globally. This current scenario has increased the concerns about global warming and encouraged the development of intensive research on different natural compounds to be used as feed additives in ruminant rations and modify the rumen ecosystem, fermentation pattern, and mitigate enteric CH4. The compounds most studied are the secondary metabolites of plants, which include a vast array of chemical substances like polyphenols and saponins that are present in plant tissues of different species, but the results are not consistent, and the extraction cost has constrained their utilization in practical animal feeding. Other new compounds of interest include polysaccharide biopolymers such as chitosan, mainly obtained as a marine co-product. As with other compounds, the effect of chitosan on the rumen microbial population depends on the source, purity, dose, process of extraction, and storage. In addition, it is important to identify compounds without adverse effects on rumen fermentation. The present review is aimed at providing in...

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Section: Chitosanmentioning

confidence: 99%

The Role of Chitosan as a Possible Agent for Enteric Methane Mitigation in Ruminants

Jiménez-Ocampo

Valencia-Salazar

Pinzón-Díaz³

et al. 2019

Animals

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“…We considered chitosan, a copolymer built from random distribution of (1–4),2-amino-2-deoxy- d -glucan and 2-acetamidodeoxy- d -glucan units, particularly useful for our design . Its choice was dictated by (i) the large availability of its source (chitin, which is the second most abundant biowaste polysaccharide after cellulose, extracted from cell fungi, the exoskeletons of arthropods, such as crustaceans and insects, the radulas of mollusks, and the beaks of cephalopods); (ii) its film-forming properties; (iii) its coordinating and stabilizing ability to metal complexes and naked particles, respectively; − and (iv) its well-established templating-effect for metal alkoxide species under sol–gel chemistry. , …”

Section: Introductionmentioning

confidence: 99%

Supramolecular Chemistry-Driven Preparation of Nanostructured, Transformable, and Biologically Active Chitosan-Clustered Single, Binary, and Ternary Metal Oxide Bioplastics

Hammi

Wrońska

Katir

et al. 2018

ACS Appl. Bio Mater.

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Aside from their economical cost and resource depletion, petroleum-based plastics generate annually a substantial amount of waste with a negative and extremely alarming impact on the environment and public health. Consequently, rising interest was devoted to search for biobased materials to find sustainable alternatives. Herein, we report a new and straightforward method to incorporate endogenous nano-objects (exemplified herein by metal oxide clusters) within polysaccharide-based films. Supramolecular chemistry based on polysaccharide self-assembly associated with the sol–gel polymerization allowed converting soluble chitosan and metal alkoxide precursors to nanostructured chitosan-clustered metal oxide films. A broad range of discrete single, binary, and ternary mixed metal oxides was successfully incorporated in the resulting bioplastics. The multifaceted use of these films was demonstrated by transforming them under gentle thermal treatment to partially oxidized chitosan–metal oxide materials or by disintegrating them in aqueous conditions to yield stable, water-dispersed chitosan-coated-metal oxide nanoparticles. The utility of these functional films was demonstrated through their use as antimicrobial agents, where significant improvement for inhibiting growth of positive and negative bacteria was observed compared to native, nonmodified chitosan films.

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“…Polysaccharides themselves [7,8] as well as polysaccharidecontaining biomass [9][10][11][12][13][14][15][16][17] are considered excellent adsorbents for harmful metal ions. [18,19] Exceptional adsorptive properties of polysaccharides are mainly attributed to: (i) high hydrophilicity of the polymer due to the hydroxyl groups of glucose units; (ii) the presence of a large number of functional and reactive groups (like acetamido, primary amino, hydroxyls or sulfonates group); and (iii) flexible structure of the polymer chain, [20] and its facile modification.…”

Section: Introductionmentioning

confidence: 99%

Adhesive Stalks of DiatomDidymosphenia geminataas a Novel Biological Adsorbent for Hazardous Metals Removal

Wysokowski

Bartczak

Żółtowska-Aksamitowska

et al. 2017

CLEAN Soil Air Water

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The application of biomass derived from the nuisance fresh‐water diatom species Didymosphenia geminata toward the adsorption and removal of heavy‐metal ions from water is reported. The cell‐free polysaccharide‐based stalks of these diatoms are used as adsorbents to remove harmful metal ions: Pb(II), Ni(II), and Cd(II). Detailed analyses of the adsorption kinetics using both pseudo‐first‐order model and pseudo‐second‐order models are performed. The results show a strong correspondence to a pseudo‐second‐order kinetic model. The Langmuir and Freundlich models are used to describe the adsorption isotherms. The correlation coefficients (r2) of the Langmuir model are equal to 0.994 (Pb2+), 0.995 (Cd2+), and 0.995 (Ni2+), and the r2 for the Freundlich model are equal to 0.991 (Pb2+), 0.991 (Cd2+), and 0.987 (Ni2+). The experimental data for all metal ions strongly support the Langmuir isotherm model. It is shown that stalks of D. geminata exhibit exceptional sorption capacity (qm) for Pb(II) ions of 175.48 mg g−1. Additionally, a high sorption capacity for Cd(II) (145.86 mg g−1), and Ni(II) (130.27 mg g−1) is observed. The thermodynamic aspects of the adsorption process of selected metal ions are also discussed. Preliminary tests investigating applications of D. geminata stalks for sewage purification from galvanic industry and battery and accumulator production were performed. These comprehensive studies show that D. geminata can be robustly applied for the removal of harmful metal ions from wastewater.

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Metal–Polysaccharide Interplay: Beyond Metal Immobilization, Graphenization‐Induced‐Anisotropic Growth

Abstract: Such sweet support: Metal-polysaccharide interplay affords, after pyrolytic transformation, highly active catalysts based on anisotropically oriented nanoparticles supported on graphene sheets.

Cited by 9 publications

References 18 publications

The Role of Chitosan as a Possible Agent for Enteric Methane Mitigation in Ruminants

The Role of Chitosan as a Possible Agent for Enteric Methane Mitigation in Ruminants

Supramolecular Chemistry-Driven Preparation of Nanostructured, Transformable, and Biologically Active Chitosan-Clustered Single, Binary, and Ternary Metal Oxide Bioplastics

Adhesive Stalks of DiatomDidymosphenia geminataas a Novel Biological Adsorbent for Hazardous Metals Removal

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