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Zhou, Shi-Dong, et al. Journal of Industrial and Engineering Chemistry 138 (2024): 282-299.
L-Methionine (L-met) has demonstrated significant potential as a kinetic promoter in hydrate-based CO₂ capture systems. In a recent study, L-met was combined with multi-walled carbon nanotubes (MWCNTs) to synergistically enhance the formation rate and gas consumption efficiency of CO₂ hydrates under mild conditions.
The optimized promoter formulation-0.1250 wt% L-met with 0.0450 wt% MWCNTs-resulted in an average 81.03% reduction in induction time and a 21.50% increase in total gas consumption compared to pure water. Notably, the initial gas consumption rate increased by 334.78% relative to the control system. FT-IR spectral analysis revealed shifts in characteristic absorption peaks, indicating strong hydrogen bonding and hydrophobic interactions between L-met and MWCNTs. These interactions disrupted native hydrogen bonding in water, facilitating a more ordered structure conducive to hydrate nucleation.
Experimentally, MWCNTs accelerated the nucleation phase by offering abundant surface sites, while L-met promoted subsequent hydrate growth along the reactor walls. The hydrophobic nature of both L-met and MWCNTs promoted the formation of semi-cage structures that act as nucleation templates, enhancing cage network formation and hydrate stability.
This study highlights L-methionine's valuable role in enhancing CO₂ capture efficiency by improving hydrate formation kinetics. Its combination with nanomaterials like MWCNTs offers a scalable and effective strategy for accelerating hydrate-based gas sequestration technologies.
Laban, Bojana, et al. Journal of Inorganic Biochemistry 204 (2020): 110958.
L-Methionine (L-Met) has been successfully applied as a dual-function capping and reducing agent in the eco-friendly synthesis of silver (Ag@LM NPs) and gold (Au@LM NPs) nanoparticles without the need for additional stabilizers or chemical reductants. This green synthesis approach yielded stable, biocompatible nanoparticles suitable for biomedical applications.
For Ag@LM NPs, 1 mL of 10⁻³ M AgNO₃ was mixed with 0.5 mL of 10⁻² M L-Met and diluted to 10 mL with water. The mixture was brought to a boil, and the color change to dark yellow confirmed nanoparticle formation. For Au@LM NPs, 10 mL of 10⁻³ M HAuCl₄ was boiled before adding 0.5 mL of 10⁻¹ M L-Met, with the final volume adjusted to 20 mL. The color transitioned from yellow to pink, indicating gold nanoparticle formation. Both colloids were adjusted to pH 9-11 with KOH and purified by centrifugation and washing.
Characterization via UV-Vis, TEM, AFM, FT-IR, and zeta potential confirmed spherical morphology, L-Met surface coverage, and colloidal stability. DFT calculations revealed that L-Met predominantly binds metal surfaces through the -NH₂ group in vertical geometry. In vitro studies using human lymphocytes indicated that while Ag@LM NPs exhibited some genotoxicity, Au@LM NPs promoted cell proliferation without inducing DNA damage. These findings highlight L-Methionine's critical role in the safe, green fabrication of noble metal nanomaterials for potential nanomedicine applications.
Kaur, R., Kumar, H., Kumar, B., Singla, M., Kumar, V., Ghfar, A. A., & Pandey, S. (2022). Heliyon, 8(8).
L-Methionine (L-Met), a naturally occurring amino acid, has been shown to significantly influence the micellization behavior of ionic liquids (ILs) in aqueous media. In a comparative study, two ILs with identical hydrophobic chain lengths-1-dodecyl-3-methylimidazolium bromide ([C12mim][Br]) and N-dodecyl-N-methylmorpholinium bromide ([Mor1,12][Br])-were analyzed in the absence and presence of L-Met using electrical conductivity, surface tension, UV-Vis spectroscopy, and dynamic light scattering (DLS).
Results showed that [C12mim][Br] exhibited lower critical micelle concentration (CMC) and higher surface activity than [Mor1,12][Br], attributed to the relatively lower hydrophilicity of the imidazolium head group compared to the morpholinium counterpart, which contains an oxygen atom. Upon introducing L-Methionine, the micellar sizes of both ILs decreased, indicating enhanced micellization, driven predominantly by hydrophobic interactions between the IL alkyl chains and L-Met molecules at higher concentrations.
The consistent CMC values obtained across all methods confirmed the reliability of the findings. Importantly, L-Methionine acted as a co-aggregating agent, reducing micelle size and modifying interfacial properties, which may be leveraged to design IL-based systems for biomedical applications such as drug delivery or cancer therapy. Given the biocompatibility of L-Met and the reduced toxicity of morpholinium ILs, their synergistic combination offers a promising pathway for developing greener and functionally tunable IL formulations.
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