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Related Concept Videos

Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
IR and UV–Vis Spectroscopy of Carboxylic Acids01:28

IR and UV–Vis Spectroscopy of Carboxylic Acids

In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency, 1710 cm−1. The C=O bond of the...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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Related Experiment Video

Updated: Jun 10, 2026

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage
12:59

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage

Published on: February 15, 2020

Chlorogenic acid UVA–UVB photostability.

Diogo P Rivelli1, Carlos A H Filho, Rebeca L Almeida

  • 1Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of São Paulo, Brasil. diogopineda@gmail.com

Photochemistry and Photobiology
|July 29, 2010
PubMed
Summary
This summary is machine-generated.

Chlorogenic acid, a natural antioxidant, is stable when exposed to UVA and UVB radiation. This finding supports its use in cosmetic formulations without degradation concerns from UV light.

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Improved UPLC-UV Method for the Quantification of Vitamin C in Lettuce Varieties (Lactuca sativa L.) and Crop Wild Relatives (Lactuca spp.)

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Last Updated: Jun 10, 2026

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage
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Improved UPLC-UV Method for the Quantification of Vitamin C in Lettuce Varieties (Lactuca sativa L.) and Crop Wild Relatives (Lactuca spp.)
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Published on: June 30, 2020

Area of Science:

  • Photochemistry
  • Cosmetic Science
  • Analytical Chemistry

Background:

  • Chlorogenic acid is a naturally occurring antioxidant with potential cosmetic applications.
  • Photochemical stability is crucial for cosmetic ingredients exposed to UV radiation.
  • Assessing UV degradation is necessary to validate chlorogenic acid's use in formulations.

Purpose of the Study:

  • To determine the photochemical stability of chlorogenic acid.
  • To evaluate its degradation under UVA and UVB irradiation.
  • To assess its suitability for cosmetic formulations.

Main Methods:

  • High-Performance Liquid Chromatography (HPLC) was used for analysis.
  • Chlorogenic acid concentration was measured before and after UV exposure.
  • UVA and UVB irradiation were employed to simulate environmental conditions.

Main Results:

  • Chlorogenic acid showed no significant degradation.
  • Concentration remained consistent after both UVA and UVB exposure.
  • The compound is stable under the tested UV conditions.

Conclusions:

  • Chlorogenic acid is photochemically stable.
  • Its stability supports its application in cosmetic products.
  • No degradation occurs upon exposure to UVA and UVB radiation.