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Related Concept Videos

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones

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Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
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Aldehydes and Ketones with Alcohols: Hemiacetal Formation01:19

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Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
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Oxidations of Aldehydes and Ketones to Carboxylic Acids01:15

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Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
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Physical Properties of Amines01:26

Physical Properties of Amines

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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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Updated: Jul 13, 2025

Use of Capillary Aerosol Generator in Continuous Production of Controlled Aerosol for Non-Clinical Studies
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Acetaldehyde as a Food Flavoring Substance: Aspects of Risk Assessment.

Alexander T Cartus1, Dirk W Lachenmeier2, Sabine Guth3

  • 1Chemservice S.A., 13, Fausermillen, Mertert, 6689, Luxembourg.

Molecular Nutrition & Food Research
|October 16, 2023
PubMed
Summary

The safety of acetaldehyde as a food flavoring is uncertain due to its genotoxic potential. More research is needed to assess risks, prompting a call for reassessment of its approval.

Keywords:
acetaldehydeexposureflavoringgenotoxicityrisk assessment

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Area of Science:

  • Food safety
  • Toxicology
  • Risk assessment

Background:

  • Acetaldehyde is used as a flavoring substance in foods.
  • Acetaldehyde exhibits in vitro genotoxicity.
  • Concerns exist regarding potential in vivo genotoxic effects following ethanol intake or acetaldehyde inhalation.

Purpose of the Study:

  • To review available data on acetaldehyde as a food flavoring.
  • To assess the health risks associated with its use.
  • To determine if current data supports safe use.

Main Methods:

  • Review of existing scientific literature and data.
  • Analysis of genotoxicity studies (in vitro and in vivo).
  • Evaluation of human exposure data.

Main Results:

  • Acetaldehyde is genotoxic in vitro.
  • In vivo genotoxic effects cannot be ruled out after oral ethanol intake or inhalation.
  • Conclusive evidence on in vivo genotoxicity after oral exposure is lacking.
  • Human exposure data is insufficient for reliable risk assessment.

Conclusions:

  • The genotoxic potential of acetaldehyde raises safety concerns.
  • Significant data gaps prevent a comprehensive health risk assessment.
  • A reassessment of the scientific basis for approving acetaldehyde as a food flavoring is recommended for precautionary consumer protection.