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Li, Shaohui, et al. Applied Surface Science 681 (2025): 161620.
L-Tryptophan, an essential aromatic amino acid, has recently gained attention as a versatile functionalization agent in nanomaterials engineering. Its unique structure, containing both -NH₂ and -COOH groups, provides abundant reactive sites for surface modification, while its indole moiety enables π-π stacking interactions with conjugated systems. In a recent study, L-tryptophan was employed to functionalize graphitic carbon nitride (g-C₃N₄), generating L-g-C₃N₄ with significantly enhanced dispersibility in aqueous media compared to bulk g-C₃N₄.
The functionalization was achieved through ultrasonic-assisted assembly, where L-tryptophan established strong π-π interactions with g-C₃N₄ sheets. This modification not only improved solubility but also introduced additional carboxyl groups, facilitating uniform deposition of cerium oxide (CeO₂) nanoparticles in subsequent hydrothermal synthesis. The resulting CeO₂/L-g-C₃N₄ nanocomposite exhibited remarkable oxidase-like catalytic activity, effectively catalyzing the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) into its colored product.
Beyond catalytic enhancement, the L-tryptophan functionalization also enabled advanced sensing applications. Coupling the nanocomposite's fluorescence properties with redox-mediated quenching, a novel on-off-on sensing platform was established for the selective detection of Cr(VI) and SO₃²⁻ ions. Theoretical analysis confirmed that the improved activity stemmed from reduced binding energy of intermediates on the modified surface.
This case study highlights the critical role of L-tryptophan in tuning the physicochemical properties of g-C₃N₄, enabling multifunctional nanocomposites with potential applications in biosensing, environmental monitoring, and nanozyme-based catalysis.
Khandelwal, Himanshu, et al. Energy & Fuels 35.1 (2020): 649-658.
L-Tryptophan, an essential amino acid widely recognized for its biological importance, has recently emerged as a promising additive in gas hydrate-based carbon capture and storage (CCS) technologies. One of the critical challenges in CO₂ hydrate formation is the inherently slow kinetics, which limit the feasibility of large-scale applications. In this context, L-tryptophan was evaluated as an environmentally friendly kinetic promoter in hydrate synthesis experiments conducted within a stirred tank reactor.
Systematic studies revealed that the addition of L-tryptophan significantly improved hydrate formation rates. At an optimal concentration of 300 ppm, the process achieved an average gas uptake of 114 v/v, corresponding to 78% water-to-hydrate conversion at 273.65 K and 3.4 MPa. This represented a four-fold increase compared to the control system without promoter. Notably, higher concentrations (1000 ppm) did not further enhance performance, suggesting a saturation effect.
Temperature played a crucial role in modulating hydrate kinetics. Lower operating temperatures (273.65-275.65 K) yielded shorter induction times and greater gas uptake relative to experiments at 277.65 K. The enhanced performance is attributed to L-tryptophan's ability to facilitate nucleation and stabilize hydrate growth, likely through hydrogen-bonding interactions and hydrophobic effects.
With its low effective dosage, high efficiency, and environmental compatibility, L-tryptophan offers a practical pathway for advancing hydrate-based CCS technologies. Its integration into industrial-scale processes may provide a sustainable and efficient solution to reduce CO₂ emissions, contributing to global climate mitigation strategies.
Shen, X., Li, Y., Li, Y., Shen, L., Maeda, N., Zhang, Y., ... & Wang, X. (2023). ACS Sustainable Chemistry & Engineering, 11(24), 8774-8785.
L-Tryptophan, an environmentally friendly amino acid, has recently been evaluated as a promising additive in hydrate-based gas solidification technology. Methane hydrates, though attractive for energy storage and gas transport, face kinetic limitations that hinder large-scale application. Traditional surfactant promoters such as sodium dodecyl sulfate (SDS) improve nucleation, but their environmental impact raises concerns. L-Tryptophan provides a sustainable alternative with unique advantages in hydrate growth kinetics.
Experimental investigations conducted under isothermal and isochoric conditions revealed that L-tryptophan did not significantly accelerate nucleation rates but exhibited superior promotion of hydrate growth compared to SDS. Remarkably, effective promotion was achieved at concentrations as low as 0.1 wt %, with negligible performance gains beyond this threshold. At 0.1 wt %, the ultimate methane gas consumption increased by 46.52% and the time to reach 90% gas uptake (t90) decreased by 33.67% when pressure was raised from 7 to 11 MPa. Temperature variations (273.65-277.15 K) influenced both gas consumption and hydrate growth time, highlighting the importance of thermodynamic conditions.
Macroscopic morphology observations demonstrated that hydrates nucleated preferentially at the gas-liquid-solid interface, spreading as thin films before expanding and climbing container walls. At higher L-tryptophan concentrations (>0.5 wt %), hydrates developed as loose, porous structures with capillary-driven solution transport.
This study underscores the potential of L-tryptophan as a sustainable kinetic promoter, offering efficient hydrate growth with minimal dosage, advancing the feasibility of hydrate-based methane storage and transport technologies.
What is the molecular formula of L-Tryptophan according to the reference?
The molecular formula of L-Tryptophan is C11H12N2O2.
What is the molecular weight of L-Tryptophan according to the reference?
The molecular weight of L-Tryptophan is 204.22 g/mol.
What are some synonyms for L-Tryptophan mentioned in the reference?
Some synonyms for L-Tryptophan are tryptophan, L-Tryptophane, and h-Trp-oh.
What role does L-Tryptophan have according to the reference?
L-Tryptophan has a role as an antidepressant, a nutraceutical, a plant metabolite, and a human metabolite.
What is the IUPAC name of L-Tryptophan?
The IUPAC name of L-Tryptophan is (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid.
What is the InChIKey of L-Tryptophan?
The InChIKey of L-Tryptophan is QIVBCDIJIAJPQS-VIFPVBQESA-N.
What is the Canonical SMILES of L-Tryptophan?
The Canonical SMILES of L-Tryptophan is C1=CC=C2C(=C1)C(=CN2)CC(C(=O)O)N.
What is the EC Number of L-Tryptophan?
The European Community (EC) Number of L-Tryptophan is 200-795-6.
What is the UNII number of L-Tryptophan?
The UNII number of L-Tryptophan is 8DUH1N11BX.
What is the ChEMBL ID of L-Tryptophan?
The ChEMBL ID of L-Tryptophan is CHEMBL54976.
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