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Zhang, Xiaocan, et al. Journal of Environmental Chemical Engineering 11.6 (2023): 111400.
L-Cysteine was employed as a key zwitterionic modifier in the synthesis of novel nanocomposites designed to enhance ultrafiltration membrane performance. The experimental process began with the preparation of PDA-coated halloysite nanotubes (PDA-HNTs), which served as the functional platform. These PDA-HNTs (0.5 g) were dispersed into a 250 mL aqueous L-Cysteine solution (0.2 g·L⁻¹, pH = 8.5) and stirred continuously under ambient conditions for 12 hours, enabling covalent grafting of L-Cysteine via a Michael addition reaction. The resulting Cys-PDA-HNTs were then repeatedly washed with deionized water and collected by centrifugation.
For membrane fabrication, the Cys-PDA-HNTs nanocomposites were blended with PVP in DMAC and stirred at 25 °C for 1 hour. Subsequently, PVDF was added and dissolved by continuous stirring at 60 °C for 12 hours, yielding a homogeneous casting solution. The formulation contained 12 wt% PVDF, 2 wt% PVP, and 86 wt% DMAC. The degassed solution was cast onto a glass plate using a 200 µm casting knife and immersed directly into a deionized water coagulation bath to initiate phase separation. The resulting wet membranes (140-160 µm thick) were washed and stored in DI water prior to performance testing.
This precise multi-step process demonstrates how L-Cysteine enables the functionalization of nanofillers and supports their integration into high-performance antifouling ultrafiltration membranes.
Li, B., Li, Y. L., Liu, X. M., Zhang, T. T., Wan, Q. C., & Li, G. C. (2025). Gas Science and Engineering, 205638.
L-Cysteine has been demonstrated as a highly effective and environmentally benign kinetic promoter in the synthesis of methane hydrates for solidified natural gas (SNG) storage. In this study, hydrate formation experiments were conducted at 275.2 K and 8 MPa to evaluate the effect of L-cysteine concentration (0.5-2 wt%) on hydrate formation kinetics, gas uptake, and morphology.
The optimal concentration of 1 wt% L-cysteine yielded a maximum methane uptake of 144.98 mmol/mol H₂O, with 90% of this capacity achieved within just 29 minutes. This represents a significant enhancement compared to other amino acids tested, including L-threonine, L-arginine, and L-valine. Morphological analysis revealed that L-cysteine promotes the formation of porous hydrates, with the structure evolving from needle-like to vein-like and eventually to cluster-like as its concentration increased.
Mechanistically, L-cysteine enriches methane locally by creating hydrophobic microenvironments, facilitating enhanced interaction between methane molecules and surrounding water. This accelerates hydrate nucleation and supports the development of a high-surface-area porous framework, which in turn improves storage density and kinetics.
This study confirms that L-cysteine is not only an efficient promoter for methane hydrate formation but also a sustainable alternative to traditional surfactants, offering a green pathway toward the commercial viability of SNG technologies.
Mobin, Mohammad, Saman Zehra, and Mosarrat Parveen. Journal of Molecular Liquids 216 (2016): 598-607.
L-Cysteine has been investigated as an environmentally friendly corrosion inhibitor for mild steel (MS) in 1 M HCl solution at temperatures ranging from 30 °C to 60 °C. Experimental techniques including weight loss analysis, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) were employed to evaluate its inhibitory efficiency. At 30 °C and 500 ppm concentration, L-cysteine achieved a maximum inhibition efficiency (IE) of 85.62%.
The corrosion inhibition performance is attributed to the strong adsorption of L-cysteine onto the MS surface via its thiol (-SH) group, which forms a protective film that reduces both anodic and cathodic reactions. FTIR analysis confirmed the presence of adsorbed CYS molecules, while SEM imaging revealed significant morphological changes, with reduced surface degradation in the presence of the inhibitor.
Furthermore, the synergistic effects of co-additives-sodium dodecyl sulfate (SDS), cetylpyridinium chloride (CPC), and Triton X-100 (TX)-were studied. Each surfactant enhanced the inhibition efficiency of L-cysteine, with the non-ionic TX showing the most significant improvement. The combined systems acted as mixed-type inhibitors, and their adsorption behavior followed Langmuir's isotherm model, indicating monolayer adsorption with strong surface interaction.
This study confirms L-cysteine's potential as a green, cost-effective, and thermally stable inhibitor, suitable for mitigating acidic corrosion in industrial applications involving mild steel.
What is the molecular formula of L-cysteine?
The molecular formula of L-cysteine is C3H7NO2S.
What is the molecular weight of L-cysteine?
The molecular weight of L-cysteine is 121.16 g/mol.
What is the IUPAC name of L-cysteine?
The IUPAC name of L-cysteine is (2R)-2-amino-3-sulfanylpropanoic acid.
What is the InChI of L-cysteine?
The InChI of L-cysteine is InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1.
What is the InChIKey of L-cysteine?
The InChIKey of L-cysteine is XUJNEKJLAYXESH-REOHCLBHSA-N.
What is the canonical SMILES of L-cysteine?
The canonical SMILES of L-cysteine is C(C(C(=O)O)N)S.
What is the CAS number of L-cysteine?
The CAS number of L-cysteine is 52-90-4.
What is the ChEBI ID of L-cysteine?
The ChEBI ID of L-cysteine is CHEBI863.
What is the FEMA number of L-cysteine?
The FEMA number of L-cysteine is 3263.
What is the KEGG ID of L-cysteine?
The KEGG ID of L-cysteine is C00097.
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