aldehyde

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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 ?
(23) The peaks at 6.2-6.6 ppm are attributed to hydrogen in amido groups.(24), (25) The peaks at 9.3-9.5 ppm assigned to hydrogen in aldehyde groups (26), (27)and the relative peak area increase along with the amount of isobutyraldehyde, which coincide with the results of FTIR.
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.
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.
The remaining part may be entrapped in the hydrogels because the amino groups of BSA can enter into Schiff's reaction with the aldehyde groups of Odex [9].
When glutaric dialdehyde concentration was increased, the amount of free aldehyde groups on the microspheres' surface will be increased thus enhancing the laccase loading capacity.
Coating of oxidized agarose on glass slides can provide aldehyde groups which bind to amino-modified DNA probes (19), also DNA probes can attach to agarose-coated glass surface using ultraviolet (UV) radiation (19), (20).
The aldehyde groups derived from the agarose film were covalently linked with amino groups of antigens.
The subsequent reduction with sodium borohydride led to the stabilization of the bonds between the protein and the polysaccharide, and to the reduction of the residual aldehyde groups [4].
OXY-Cel contains aldehyde groups introduced directly into the cellulose chain without any spacer.
GEN has three free primary amino groups, which can enter into reaction with aldehyde groups of ADA (Figure 1).
We believe that slow release observed from matrices having a higher degree of oxidation is due to the better drug conjugation onto the polymer because of the large number of aldehyde groups present.

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