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Related Concept Videos

Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

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Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
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Stability of Equilibrium Configuration01:23

Stability of Equilibrium Configuration

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Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
415
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
313
Carbocations02:10

Carbocations

10.7K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
10.7K
Relative Stabilities of Alkenes01:59

Relative Stabilities of Alkenes

13.8K
The relative stability of alkenes can be determined by comparing their heats of hydrogenation. The lower heat of hydrogenation indicates the more stable alkene.  The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.
13.8K
Types of Enols and Enolates01:19

Types of Enols and Enolates

2.5K
Aldehydes and ketones form enols, although only about 1% of the enol is present at the equilibrium for simple monocarbonyl compounds. The enol form is undetectable for acetaldehyde, present as only 1.5 × 10−4 % of acetone, and present as only 1.2% of cyclohexanone. Two kinds of regioisomeric enols are possible for unsymmetrical ketones, and their net composition is 1% at equilibrium. This instability is due to the lower bond energy of C=C than the C=O group. The...
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Updated: May 21, 2025

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
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A Stable and Local H2 Nanogenerator for Antifading Responses.

Jiaying Cao1,2, Mingwei Zhong1, Siyu Wang1

  • 1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 214122 Wuxi, Jiangsu, China.

ACS Applied Bio Materials
|May 19, 2025
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Summary

This study introduces an in-situ hydrogen production system (HPS) for enhanced antioxidant therapy. The novel system effectively reduces inflammation and shows potential for anti-aging cosmetic applications.

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anti-inflammatoryantifadingbiohydrogen productionemodinliposome

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cosmetic Science

Background:

  • Persistent inflammation is a hallmark of cellular senescence.
  • Traditional hydrogen (H2) therapy faces challenges with solubility and efficiency.
  • Developing advanced systems for targeted H2 delivery is crucial for anti-aging and anti-inflammatory treatments.

Purpose of the Study:

  • To design and evaluate an in-situ hydrogen production system (HPS) for efficient H2 generation.
  • To investigate the anti-inflammatory and anti-senescence effects of the HPS.
  • To assess the potential of HPS for transdermal delivery in cosmetic applications.

Main Methods:

  • Liposome-encapsulated system utilizing emodin (photosensitizer), L-ascorbic acid-2-phosphate trisodium salt (AAP, H2 source), and gold nanoparticles (Au NPs, photocatalyst).
  • Characterization of HPS stability under thermal stress.
  • In vitro assessment of HPS efficacy in reducing inflammatory factors (TNF-α, IL-6, ROS) and senescence markers (β-galactosidase) in RAW264.7 cells.
  • In vitro transdermal penetration studies using pig skin models.

Main Results:

  • The HPS demonstrated excellent stability at 50°C for 28 days.
  • HPS significantly reduced levels of TNF-α, IL-6, and ROS in cells.
  • Senescence-associated β-galactosidase activity was effectively eliminated by the HPS.
  • Successful transdermal penetration of the HPS through pig skin was confirmed.

Conclusions:

  • The developed HPS offers a stable and efficient platform for in-situ hydrogen production.
  • The system exhibits potent anti-inflammatory and anti-senescence properties.
  • The HPS shows significant promise for transdermal delivery in anti-aging and cosmetic formulations.