Molecular aspects on the amino acid-mediated sol–gel process of tetramethoxysilane in water

Kaßner, Lysann; Kronawitt, Julia; Klimm, Daniela; Seifert, Andreas; Spange, Stefan

doi:10.1007/s10971-019-04930-7

Cited by 4 publications

(5 citation statements)

References 44 publications

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“…Some of our findings about the participation of both extremities of amino acid, were shared by the recent work of Kaβner et al . They studied the role of amino‐acids embedded in silica material, in the aim to develop a reproducible process to prepare solid monoliths (32 wt%) without the use of organic solvent and at controlled pH thanks to amino‐acid induced pH (dependant of their isoelectric point).…”

Section: Resultsmentioning

confidence: 61%

“…Other organic compounds may also drive the assembly of precursors by forming complexes. This is the case of multifunctional compounds like diols, sugars and amino acids …”

Section: Resultsmentioning

confidence: 99%

“…This is the case of multifunctional compounds like diols, [34] sugars [35][36][37][38][39][40][41] and amino acids. [35,[42][43][44][45][46] A panel of organic compounds, including those cited above, were selected. It is worth noting that pH had to be adjusted to 7.4 with certain compounds (e. g. amines, carboxylic acids, noted with an '*' in Table 1).…”

Section: Resultsmentioning

confidence: 99%

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Biocompatible Glycine‐Assisted Catalysis of the Sol‐Gel Process: Development of Cell‐Embedded Hydrogels

et al. 2019

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The sol‐gel process can be used for hydrogel cross‐linking, thus opening an attractive route for the design of biocompatible hydrogels under soft conditions. The sol‐gel process can be catalysed at basic or acidic pH values, under neutral conditions with the addition of a nucleophile. Therefore, working around pH 7 unlocks the possibility of direct cell embedment and the preparation of bioinks. We aimed to propose a generic method for sol‐gel 3D bioprinting, and first screened different nucleophilic catalysts using bis‐silylated polyethylene glycol (PEG) as a model hydrogel. A synergistic effect of glycine and NaF, used in low concentrations to avoid any toxicity, was observed. Biocompatibility of the approach was demonstrated by embedding primary mouse mesenchymal stem cells. The measure of viscosity as a function of time showed the impact of reaction parameters, such as temperature, complexity of the medium, pH and cell addition, on the kinetics of the sol‐gel process, and allowed prediction of the gelation time.

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Section: Resultsmentioning

confidence: 61%

“…Other organic compounds may also drive the assembly of precursors by forming complexes. This is the case of multifunctional compounds like diols, sugars and amino acids …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Biocompatible Glycine‐Assisted Catalysis of the Sol‐Gel Process: Development of Cell‐Embedded Hydrogels

et al. 2019

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“…This speculation is substantiated by the results revealed in Table 1, which illustrate an elevated loss rate of acidic AA at pH 2.0 and 4.0 compared to pH 6.0 and 8.0, while the loss rate of basic AA escalated significantly at pH 6.0 and 8.0 upon decolourization treatment. This could be ascribed to the propensity of these AAs to be adsorbed by activated carbon, when the solution pH approaches the isoelectric points of aspartic acid and glutamic acid (with isoelectric points of 2.77 and 3.22, respectively), as well as histidine, lysine, and arginine (with isoelectric points of 7.59, 9.74, and 10.76, respectively) (Kaßner et al ., 2019; Wang et al ., 2019). Aromatic AA exhibited the highest loss rates, ranging from 23.81%–33.21% with 0.5% activated carbon treatment and 53.04%–64.78% with 1.5% activated carbon treatment.…”

Section: Resultsmentioning

confidence: 99%

Optimising decolourization and nitrogen component properties of corn protein hydrolysate: impact of activated carbon dosage and pH

Fu,

Wang,

Chen

et al. 2024

Int J of Food Sci Tech

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SummaryThis research was designed to examine the effects of activated carbon dosage and pH on various attributes of corn protein hydrolysate, including decolourization efficiency, nitrogen component, amino acid (AA) composition, protein secondary structure, and antioxidant activity. Optimal pigment elimination of occurred within the pH range of 2.0–4.0, utilising the hydrolysate as the control. Remarkably, the removal of trichloroacetic acid (TCA) insoluble peptide was evident at pH 4.0. The decolourization process elicited considerable reduction of the aromatic AA, exhibiting pronounced decreases of acidic AA (Glu and Asp) within the pH range of 2.0–4.0, and basic AA (His, Lys, and Arg) within the range of 6.0–8.0. Meanwhile, infrared spectroscopy analyses indicated that a dosage of 0.5% activated carbon at pH 4.0, effectively preserved the secondary structure and ratios of the control, maintaining its antioxidant activity. These results provide insights into optimisation strategies for decolourization in the food industry.

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“…Recently, nuclear magnetic resonance (NMR) and Fourier-transform infrared (FT-IR) spectroscopy have been usually used to analyze the fundamental chemical reaction and structure of the sol in the experiment. [21][22][23] Due to their limited in situ characterization of the sol, it is difficult to study the formation process of aluminum sol at the molecular level and obtain their specific structure using these experimental methods. However, density functional theory (DFT) based on quantum chemistry can overcome the experimental limitation and has been confirmed to be a credible way to study the structure or reaction mechanism of Al(III) species and other compounds.…”

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confidence: 99%

A density functional theory study on the structure formation of Al(III) carboxylate complexes in aqueous aluminum sols

Liu

Wang

et al. 2020

Int J of Quantum Chemistry

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In-depth studies of the structure of precursor sols is very important for understanding the subsequent sol to gel transition. Here, density functional theory was applied to study the reaction of Al powder with formic and acetic acid in aqueous solution to find the structure of Al(III) complex in precursor sols. The Al 3+ ion obtained by dissolving Al powder in aqueous solution of formic and acetic acid would preferentially coordinate with water molecules to form aluminum hydrates. As the reaction energy barrier of aluminum hydrates with CH 3 COO − and HCOO − was comparable, both aluminum formoacetate and other aluminum carboxylate monomers could be obtained. Most Al(III) complexes formed by other carboxylate monomers were similar to that prepared from aluminum formoacetate. However, some Al(III) monomers and Al(III) dimer with different structural characteristics might be detrimental to the formation of linear polymers. The formation of other aluminum carboxylate monomers had great influence on the structure of precursor sols.

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Molecular aspects on the amino acid-mediated sol–gel process of tetramethoxysilane in water

Cited by 4 publications

References 44 publications

Biocompatible Glycine‐Assisted Catalysis of the Sol‐Gel Process: Development of Cell‐Embedded Hydrogels

Biocompatible Glycine‐Assisted Catalysis of the Sol‐Gel Process: Development of Cell‐Embedded Hydrogels

Optimising decolourization and nitrogen component properties of corn protein hydrolysate: impact of activated carbon dosage and pH

A density functional theory study on the structure formation of Al(III) carboxylate complexes in aqueous aluminum sols

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