Designed Negative Feedback from Transiently Formed Catalytic Nanostructures
作者:Syed Pavel Afrose、Subhajit Bal、Ayan Chatterjee、Krishnendu Das、Dibyendu Das
DOI:10.1002/anie.201910280
日期:2019.10.28
helical nanostructures leads to rapid hydrolysis of the substrate providing negativefeedback on the stability of the nanostructures and realization of an out-of-equilibrium state. This simple system, made from amino acid functionalized lipids, demonstrates a substrate-induced self-assembled state, where the fuel-to-waste conversion leads to the temporal presence of helical nanostructures.
Emergence of a Promiscuous Peroxidase Under Non‐Equilibrium Conditions**
作者:Sumit Pal、Antara Reja、Subhajit Bal、Baishakhi Tikader、Dibyendu Das
DOI:10.1002/anie.202111857
日期:2022.1.10
acceleration of catalytic potential resulting in degradation of the substrate. Furthermore, latent catalytic function was displayed to hydrolyze a precursor to yield the same substrate suggesting promiscuous activity.
An object of the present invention is to provide an external use composition having a novel composition that has a superior effect promoting collagen production and is able to suppress, prevent or improve wrinkles and sagging of the skin with aging.
The present invention relates to an external use composition for anti-aging, comprising (A) a lipopeptide represented by the following formula (1), or a pharmaceutically acceptable salt thereof:
(wherein, R1 represents a saturated aliphatic group, or aliphatic group having a single unsaturated bond, having 9 to 19 carbon atoms, and m represents 0 or 1).
An object of the present invention is to provide an external use composition having a novel composition that has a superior effect promoting collagen production and is able to suppress, prevent or improve wrinkles and sagging of the skin with aging.
The present invention relates to an external use composition for anti-aging, comprising (A) a lipopeptide represented by the following formula (1), or a pharmaceutically acceptable salt thereof:
(wherein, R1 represents a saturated aliphatic group, or aliphatic group having a single unsaturated bond, having 9 to 19 carbon atoms, and m represents 0 or 1).
Preparation, characterization, and surface and biological properties of<i>N</i>-stearoyl amino acids
作者:A. Sivasamy、M. Krishnaveni、P. G. Rao
DOI:10.1007/s11746-001-0361-5
日期:2001.9
AbstractSeveral lipoamino acids were synthesized, in which n‐octadecanoic acid (stearic acid) was coupled with the α‐amino group of an amino acid. The products were characterized and their identities confirmed by advanced analytical techniques like Fourier transform infrared 1H nuclear magnentic resonance spectroscopy, and differential scanning, calorimetry. Their surface properties, such as critical micelle concentration (CMC) and foaming properties, biodegradability, and antimicrobial activity were also evaluated. The N‐stearoyl amino acids (NSA) had low CMC values, and some of them showed good foaming properties. They were screened for antimicrobial activity against the gram‐positive bacteria Staphylococcus aureus, Micrococcus luteus, and Bacillus cerceus, the gram‐negative bacteria Escherichia coli and Pseudomonas aeruginosa, and the yeast Candida albicans. All the compounds inhibited at least one of these organisms. N‐Stearoyl proline was the most effective, the order of antimicrobial activity being aromatic NSA> acidic NSA>basic NSA. However, the effective inhibition by all the compounds indicates the desirability of more thorough investigation and suggests that some of these compounds may have potential utility as biostatic additives in commercial products. All NSA are highly biodegradable and can readily be removed under conditions of normal secondary sewage treatment.