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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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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.
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Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...
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Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
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Updated: Jul 15, 2025

DNA Electrophoresis Using Thiazole Orange Instead of Ethidium Bromide or Alternative Dyes
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Acid Orange 3.

Christina L Burnett1, Wilma F Bergfeld2, Donald V Belsito2

  • 1Cosmetic Ingredient Review Senior Scientific Analyst/Writer.

International Journal of Toxicology
|September 26, 2023
PubMed
Summary
This summary is machine-generated.

The Expert Panel for Cosmetic Ingredient Safety reaffirmed that Acid Orange 3 is safe for hair dye formulations. Updated reviews confirm its safety at concentrations below 0.2%.

Keywords:
Acid Orange 3CosmeticsSafety

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Area of Science:

  • Cosmetic Science
  • Toxicology
  • Dermatology

Background:

  • The safety of Acid Orange 3, a cosmetic ingredient, was previously assessed in 2000.
  • Updated toxicological data and usage patterns have become available since the initial assessment.

Purpose of the Study:

  • To review updated information on Acid Orange 3.
  • To reassess the safety of Acid Orange 3 in cosmetic products, specifically hair dyes.

Main Methods:

  • The Expert Panel for Cosmetic Ingredient Safety reviewed new data.
  • Evaluated updated product types, usage frequency, and concentration data.

Main Results:

  • The panel reaffirmed the original safety conclusion for Acid Orange 3.
  • Acid Orange 3 is considered safe for use in hair dye formulations.

Conclusions:

  • Acid Orange 3 is safe for cosmetic use in hair dyes at concentrations less than 0.2%.
  • Continued monitoring and adherence to safe concentration limits are recommended.