aldehyde


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Related to aldehyde: Aldehyde dehydrogenase

aldehyde

(ăl`dəhīd) [alcohol + New Lat. dehydrogenatus=dehydrogenated], any of a class of organic compounds that contain the carbonyl groupcarbonyl group
, in chemistry, functional group that consists of an oxygen atom joined by a double bond to a carbon atom. The carbon atom is joined to the remainder of the molecule by two single bonds or one double bond.
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, , and in which the carbonyl group is bonded to at least one hydrogen; the general formula for an aldehyde is RCHO, where R is hydrogen or an alkyl or aryl group. Aldehydes are formed by partial oxidation of primary alcohols and form carboxylic acids when they are further oxidized. The common name for an aldehyde is often derived from the name of the acid it forms; the IUPAC name is usually derived from the name of the alcohol from which it is formed. Low molecular weight aldehydes, e.g., formaldehydeformaldehyde
, HCHO, the simplest aldehyde. It melts at −92°C;, boils at −21°C;, and is soluble in water, alcohol, and ether; at STP, it is a flammable, poisonous, colorless gas with a suffocating odor.
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 and acetaldehydeacetaldehyde
or ethanal
, CH3CHO, colorless liquid aldehyde, sometimes simply called aldehyde. It melts at −123°C;, boils at 20.8°C;, and is soluble in water and ethanol.
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, have sharp, unpleasant odors; higher molecular weight aldehydes, e.g., benzaldehydebenzaldehyde
or benzenecarbonal
, C6H5CHO, colorless liquid aldehyde with a characteristic almond odor. It boils at 180°C;, is soluble in ethanol, but is insoluble in water.
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 and furfuralfurfural
or furfuraldehyde
[Lat.,=bran], C4H3OCHO, viscous, colorless liquid that has a pleasant aromatic odor; upon exposure to air it turns dark brown or black. It boils at about 160°C;.
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, have pleasant, often flowery, odors and are found in the essential oilsessential oils,
volatile oils that occur in plants and in general give to the plants their characteristic odors, flavors, or other such properties. Essential oils are found in various parts of the plant body (in the seeds, flowers, bark, or leaves) and are also concentrated in
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 of certain plants. Aldehydes are used for the manufacture of synthetic resins, e.g., bakelite, and for making dyestuffs, flavorings, perfumes, and other chemicals. Some are used as preservatives and disinfectants.

aldehyde

[′al·də‚hīd]
(organic chemistry)
One of a class of organic compounds containing the CHO radical.

aldehyde

1. any organic compound containing the group -CHO. Aldehydes are oxidized to carboxylic acids and take part in many addition reactions
2. consisting of, containing, or concerned with the group -CHO
References in periodicals archive ?
2]" case, the upper phase contains only methanol and aldehyde vapor, so consequently only a small fraction of the reactants added to the reactor does not affect the outcome of the reaction.
Variables: the characteristics ill an experiment that change (for example, roasting temperature and peanuts' aldehyde levels)
Aldehyde measurement from glued-laminated timber is usually performed using the small chamber method and by sealing both cross-sectional sides (Matsuda et al.
Tissue distribution of aldehyde dehydrogenase 2 and effects of the ALDH2 gene disruption on the expression of enzymes involved in alcohol metabolism.
This molecular sieve is highly selective for adsorbing odor-causing compounds like aldehydes and ketones.
However, applying such empirical models is restricted to terpene concentrations, especially as long as aldehyde formation does not terminate at early stages of emission testing.
After technical drying, TVOC of fungal treated material decreased substantially due to the reduction of aldehyde emissions.
The investigators exposed cinnamic aldehyde to 158 F for up to 1 hour in a closed system.
Tenders are invited for Analysis of DNPH Aldehyde Cartridges.
Activ'Air board look like standard plasterboard, but incorporates a mineral-based additive into its gypsum core that captures VOCs such as the toxic aldehyde formaldehyde and converts them into harmless inert aldehydes.
In order to better understand the conditions that may affect the antimicrobial activity of plant-derived phenolics, researchers at the University of Georgia determined the activity of cinnamic aldehyde when it is exposed to high temperatures.
In order to avoid this, we've found that bedbug nymphs release aldehyde pheromones that let the male know that they should look elsewhere," said Harraca.