(Amino acid+silica) adsorption thermodynamics: Effects of temperature

Sebben, Damien A.; Pendleton, Phillip

doi:10.1016/j.jct.2015.03.018

Cited by 13 publications

(11 citation statements)

References 32 publications

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“…Therefore, using a lower temperature would promote the adsorption of MCs. The same conclusion has also been reported by Moreno-Castilla [133] and Sebben and Pendleton [139]. Park et al [109] also investigated the adsorption efficiency of MCs on mesoporous carbon using thermodynamic models.…”

Section: Temperaturesupporting

confidence: 76%

“…Several studies have shown that general hydrogen bonding is also prevalent in the adsorption of very low molecular weight cyanobacterial components, including MCs [125,159,160]. Hydrogen bonds are typically formed between the protonated functional groups of the adsorption participants, as has been reported for the N heteroatoms of the guanidyl group in arginine molecules and the hydroxyl groups of AC [139,158]. Similar trends were observed for the adsorption of the abundant amino acids in MCs using two types of AC (Filrasorb (FTL) and Picabiol (PIC)).…”

Section: Possible Adsorption Mechanismsmentioning

confidence: 90%

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Adsorbents Used for Microcystin Removal from Water Sources: Current Knowledge and Future Prospects

et al. 2022

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The increasing occurrence of toxic cyanobacteria in water sources, driven by climate change and eutrophication, is of great concern worldwide today. Cyanobacterial blooms can negatively affect water bodies and generate harmful secondary metabolites, namely microcystins (MCs), which significantly impair water quality. Various adsorbents used for MC removal from water sources were assessed in this investigation. Activated carbon constitutes the most widely used adsorbent for treating contaminated waters due to its high affinity for adsorbing MCs. Alternative adsorbents have also been proposed and reported to provide higher efficiency, but the studies carried out so far in this regard are still insufficient. The mechanisms implicated in MC adsorption upon different adsorbents should be further detailed for a better optimization of the adsorption process. Certainly, adsorbent characteristics, water pH and temperature are the main factors influencing the adsorption of MCs. In this context, optimization studies must be performed considering the effectiveness, economic aspects associated with each adsorbent. This review provides guidelines for more practical field applications of the adsorption in the treatment of waters actually contaminated with MCs.

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Section: Temperaturesupporting

confidence: 76%

Section: Possible Adsorption Mechanismsmentioning

confidence: 90%

Adsorbents Used for Microcystin Removal from Water Sources: Current Knowledge and Future Prospects

et al. 2022

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“…The adsorption of amino acids on different ceramic surfaces is well studied, − mainly due to the long-term interest in revealing the role of early earth minerals in the prebiotic formation of peptides, proteins, and other biomolecules. ,− Early studies showed that adsorbed amino acids can be activated and go through condensation reactions (polymerization) after dry–wet or heating cycles. , Other studies demonstrated that amino acids bond to ceramic surfaces. − Although the role of inorganic surfaces in prebiotic peptide formation and stereospecificity of the bonds between amino acids and minerals are still in dispute, it is likely that surface immobilization of amino acids facilitates the condensation reaction due to the inherent proximity of the reactants, bond activation by coordination with mineral surfaces, and mitigation of the thermodynamic favorability of peptide bond hydrolysis.…”

Section: Introductionmentioning

confidence: 99%

Chiral Ceramic Nanoparticles and Peptide Catalysis

et al. 2017

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The chirality of nanoparticles (NPs) and their assemblies has been investigated predominantly for noble metals and II-VI semiconductors. However, ceramic NPs represent the majority of nanoscale materials in nature. The robustness and other innate properties of ceramics offer technological opportunities in catalysis, biomedical sciences, and optics. Here we report the preparation of chiral ceramic NPs, as represented by tungsten oxide hydrate, WO·HO, dispersed in ethanol. The chirality of the metal oxide core, with an average size of ca. 1.6 nm, is imparted by proline (Pro) and aspartic acid (Asp) ligands via bio-to-nano chirality transfer. The amino acids are attached to the NP surface through C-O-W linkages formed from dissociated carboxyl groups and through amino groups weakly coordinated to the NP surface. Surprisingly, the dominant circular dichroism bands for NPs coated by Pro and Asp are different despite the similarity in the geometry of the NPs; they are positioned at 400-700 nm and 500-1100 nm for Pro- and Asp-modified NPs, respectively. The differences in the spectral positions of the main chiroptical band for the two types of NPs are associated with the molecular binding of the two amino acids to the NP surface; Asp has one additional C-O-W linkage compared to Pro, resulting in stronger distortion of the inorganic crystal lattice and greater intensity of CD bands associated with the chirality of the inorganic core. The chirality of WO·HO atomic structure is confirmed by atomistic molecular dynamics simulations. The proximity of the amino acids to the mineral surface is associated with the catalytic abilities of WO·HO NPs. We found that NPs facilitate formation of peptide bonds, leading to Asp-Asp and Asp-Pro dipeptides. The chiroptical activity, chemical reactivity, and biocompatibility of tungsten oxide create a unique combination of properties relevant to chiral optics, chemical technologies, and biomedicine.

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“…The adsorption characteristics of amino acids on silica surfaces have been reported, and glycine and lysine are mainly adsorbed via electrostatic action. Glutamic acid is adsorbed via hydrogen bonds and forms intermolecular clusters around an adsorbed nucleus (Sebben & Pendleton, 2015). These results indicate that the free amino acids were unstable and adsorbed on mineral and oxide surfaces, forming aggregates and precipitates.…”

Section: Resultsmentioning

confidence: 99%

“…Glutamic acid is adsorbed via hydrogen bonds and forms intermolecular clusters around an adsorbed nucleus (Sebben & Pendleton, 2015). These results indicate that the free amino acids were unstable and adsorbed on mineral and oxide surfaces, forming aggregates and precipitates.…”

Section: Nutritional Componentsmentioning

confidence: 97%

Acidity rectified aggregation behaviour of colloids in sugarcane juice

Meng

Shi

Wen

et al. 2022

Int J of Food Sci Tech

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During processing and low-temperature storage, pH change affects the stability of sugarcane juice. This study investigated the colloidal stability and aggregation mechanisms of membrane-filtered sugarcane juice at the pH range of 2.5-9.5. The mechanisms of aggregate formation were speculated based on the compositional variations in sugarcane juice at different pH. When pH was lower than 6.03, aggregation was driven by the electrostatic effect, wherein proteins, polysaccharides and phenolic compounds interact, hence increase the average particle size and turbidity. The absolute value of the zeta potential of the juice was decreased and found an isoelectric point at the pH range of 3.0-3.5. However, under alkaline conditions, calcium phosphate mesh flocs, which are the dominant components of the aggregate, attract colloidal impurities in the juice, eventually resulting in a sharp increase in turbidity and the rapid formation of enormous precipitates, further increasing particle size. This work provides new clues to control aggregation issues commonly encountered by the sugarcane beverage industry.

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(Amino acid+silica) adsorption thermodynamics: Effects of temperature

Cited by 13 publications

References 32 publications

Adsorbents Used for Microcystin Removal from Water Sources: Current Knowledge and Future Prospects

Adsorbents Used for Microcystin Removal from Water Sources: Current Knowledge and Future Prospects

Chiral Ceramic Nanoparticles and Peptide Catalysis

Acidity rectified aggregation behaviour of colloids in sugarcane juice

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