aldehyde

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aldehyde

 [al´dĕ-hīd]
an organic compound containing the aldehyde functional group (-CHO); that is, one with a carbonyl group (C=O) located at one end of the carbon chain.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

al·de·hyde

(al'dĕ-hīd),
A compound containing the radical -CH=O, reducible to an alcohol (CH2OH) and oxidizable to a carboxylic acid (COOH), for example, acetaldehyde.
Farlex Partner Medical Dictionary © Farlex 2012

aldehyde

An organic compound with a formyl group (R-CHO), which is double-bonded to an O2 (i.e., a carbonyl group, C=O), single-bonded to a hydrogen and single-bonded to another group (e.g., methane, benzene, hydrogen, etc.). The aldehydes in some essential oils contribute to their pleasant odoor, including vanillin, cilantro and cinnamaldehyde.

Example
Acetaldehyde (CH3CHO), butyraldehyde (CH3(CH2)2CHO).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

al·de·hyde

(al'dĕ-hīd)
A compound containing the radical -CH=O, reducible to an alcohol (-CH2OH), oxidizable to a carboxylic acid (-COOH); e.g., acetaldehyde.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

aldehyde

A product of dehydrogenated (metabolized) alcohol, hence the name. Aldehydes cause most of the toxic effects of bibulous overindulgence (hangover).
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

al·de·hyde

(al'dĕ-hīd)
A compound containing the radical -CH=O, reducible to an alcohol (-CH2OH), oxidizable to a carboxylic acid (-COOH); e.g., acetaldehyde.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
The alkoxy radicals formed (see reaction 13) have a high tendency to undergo [beta]-scission, thus forming hexanal and pentanal. The formation of alkoxy radicals disrupts the radical chain of reactions 2 and 3 (see Fig.
The head-space GC-MS data for the Co-EH-catalyzed EL oxidation reaction show that constant hexanal and pentanal formation takes place, a sure sign of [beta]-scission reactions.
In contrast, both crude fat (-0.71 [less than or equal to] r [less than or equal to] -0.60, p<0.001) and reducing sugar contents (-0.49 [less than or equal to] r [less than or equal to] -0.39, p<0.05) were negatively correlated with several volatile compounds, including propanal, pentanal, hexanal, heptanal, octanal, and n-pentane (Table 6).
In contrast, the C16:0, C16:1, C18:1n9, and MUFA percentages of LT fat were negatively correlated (-0.81 [less than or equal to] r [less than or equal to] -0.50, p<0.01) with several volatile compounds, including propanol, pentanal, hexanal, and n-pentane (Table 7).
Since pentanal showed the most sensitive response (the steepest slopes) with change of TVOC emissions, it may be used for the prediction of TVOC emissions for practical purposes.
Since pentanal showed the most sensitive response with the change of TVOC emissions, it may be used for the prediction of TVOC emissions for practical purposes.
Three-week-old pellet samples with a pungent smell showed high emission values of hexanal and pentanal. These pellets were made of a mixture of fresh and stored sawdust.
From the above results it is assumed that the pungent smell was due to hexanal and pentanal, although other compounds might also be involved.
The formation of latter 2 volatiles involves thermal and oxidative degradation of lipids, pentanal and hexanal (Shi and Ho, 1994).
An internal standard compound, 2-methyl-3-methanone, n-alkane ([C.sub.8]-[C.sub.20]) and authentic compounds including acetaldehyde, trans-2-decenal, 2-methylpropanal, 2-methylbutanal, 3-methylbutanal, pentanal, hexanal, heptanal, (E), 2-heptenal, 2-methylthiazole, benzaldehyde, octanal, benzeneacetaldehyde, nonanal, decanal, (E,E), 2,4-decadienal, ethanol, 1-propanol, 2-furanmethanol, 1-hexanol, 1-octen-3-ol, fufural, tetradecanal, 1-octanol, acetone, 2-propanone, 2,3-butanedione, 2-butanone, 2-heptanone, 3-octanone, dimethyldisulfide, pyrazine, methylpyrazine, 2,3-dimethylpyrazine etc.
The correlation coefficients ([r.sup.2]) of the quadratic models are 0.99 and 0.90 for hexanal and pentanal, respectively.
Emissions of small straight-chain aldehydes, such as hexanal, pentanal, heptanal, octanal, and nonanal, generally exceeded emissions of other compounds and accounted for more than 50 percent of total VOC emissions.