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Related Concept Videos

IR and UV–Vis Spectroscopy of Carboxylic Acids01:28

IR and UV–Vis Spectroscopy of Carboxylic Acids

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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,...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Carboxylic acids, upon heating, undergo a decarboxylation reaction by releasing carbon dioxide gas. Monocarboxylic acids do not undergo decarboxylation easily. However, a silver salt of carboxylic acid reacts with bromine or iodine under high temperature to release carbon dioxide gas and forms halide with one less carbon. This reaction is called the Hunsdiecker reaction.
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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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Pigmentation01:19

Pigmentation

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The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
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Updated: Sep 3, 2025

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Getting to know carotenoids.

George Britton1

  • 1The University of Liverpool School of Biological Sciences, Liverpool, United Kingdom.

Methods in Enzymology
|July 25, 2022
PubMed
Summary
This summary is machine-generated.

This chapter guides non-specialists on carotenoids, covering their structure, properties, and safe handling. It details isolation, identification, and analysis methods for these vital natural compounds.

Keywords:
Analysis and identificationCarotenoids and apocarotenoidsChemistryChromatographyHPLCIsolationNomenclatureProperties in situ

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Area of Science:

  • Biochemistry
  • Natural Product Chemistry

Background:

  • Over 600 unique carotenoids exist, yet share fundamental properties.
  • Understanding carotenoids is crucial for research and applications.

Purpose of the Study:

  • To provide a comprehensive guide for non-specialists on carotenoid peculiarities.
  • To detail safe handling, isolation, identification, and analysis techniques.

Main Methods:

  • Discussion of carotenoid structure, nomenclature (IUPAC rules), and chemical/physical properties.
  • Explanation of factors influencing in situ carotenoid behavior (aggregation, interactions).
  • Overview of analytical methods including spectrophotometry.

Main Results:

  • Carotenoid properties are linked to their conjugated polyene system and molecular shape.
  • In situ properties are affected by aggregation and interactions with lipids and proteins.
  • Apocarotenoids nomenclature is briefly addressed.

Conclusions:

  • This guide equips newcomers with essential knowledge for working with carotenoids.
  • Understanding carotenoid properties is key to their biological functions and reliable analysis.