aldehyde

(redirected from aldehyde group)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

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.
..... Click the link for more information.
, , 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.
..... Click the link for more information.
 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.
..... Click the link for more information.
, 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.
..... Click the link for more information.
 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;.
..... Click the link for more information.
, 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
..... Click the link for more information.
 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 ?
3 that the peaks al about 204 ppm are attributed to carbon atoms in aldehyde groups, further confirming the presence of aldehyde in the resin, (29), (30) and the relative peak area increases on increasing the amount of isobulyraldehyde.
In addition, the UIF resins also contained hydroxyl groups, and the content of aldehyde groups in the resin increased with the increase of isobutyraldehyde.
This conclusion can be made from the NMR spectra of the formed resins, where no amino and aldehyde groups can be seen, and from the hydroxyl equivalent of formed resins (Table 2), which increases with increasing molar ratio.
3), which means an increase of the quantity of aldehyde groups in individual reaction mixtures.
5, the ratio between amino and aldehyde groups is 2:2.
At the beginning of the reaction the aldehyde groups react more intensively with amino groups than with imino groups.
The aldehyde groups derived from the agarose film were covalently linked with amino groups of antigens.
Activated agarose provided a thin layer on the glass with active aldehyde groups which can bind to amino groups on various biomolecules, such as DNA, proteins, peptides and phospholipids.
Previous studies ascertained active aldehyde groups in agarose could be linked to amino groups in biomolecules and after UV crosslinking, the covalent binds could be formed.
OXY-Cel contains aldehyde groups introduced directly into the cellulose chain without any spacer.

Full browser ?