unsaturation


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unsaturation

[¦ən‚sach·ə′rā·shən]
(organic chemistry)
A state in which the atomic bonds of an organic compound's chain or ring are not completely satisfied (that is, not saturated); usually applies to carbon, but can include other ring or chain atoms; unsaturation usually results in a double bond (as for olefins) or a triple bond (as for the acetylenes).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The molecular formula was established as, C19H34N2O, by HREIMS (m/z 306.2653), requires four degrees of unsaturation. The compound displayed an absorption bands at 207, 259, 263 and 267 nm, interpreted for aromatic compound.
The low intensity of the signals near 130 ppm confirms the low content of unsaturation of the fatty acid chains observed in the others analysis.
This study did not find any significant evidence for species or varietal differences that are related to geography, though freshly collected nuts did exhibit subtle differences in unsaturation that could be discerned using ATR-FTIR analyses of cold-pressed oils obtained with a simple hand press.
The characteristics of lipid chain length, branching and unsaturation can be investigated by comparing contributions of lipid C[H.sub.3] and C[H.sub.2] functional groups [16,18].
lactis grown at different NaCl concentrations on YEPD broth medium, pH 6 at 28UC for maximum growth NaCl% Fatty acids "as % of total fatty acids" C16:0 C16:1 C18:0 C18:1 C18:2 0 ND 25.87 40.66 50.00 ND 2 ND ND 44.00 12.00 ND 4 ND 33.18 46.22 11.30 ND 6 4.59 12.35 49.11 11.50 2.30 8 5.98 12.19 54.00 10.80 1.16 NaCl% Fatty acids "as % of total fatty acids" C18:3 C20:0 C22:0 C24:0 0 2.00 ND 3.52 ND 2 1.58 ND 4.80 ND 4 1.41 ND ND ND 6 1.29 4.93 4.85 4.88 8 1.00 8.48 4.9 4.61 # Unsaturation index = 1 (% monoenes) + 2 (% dienes) + 3 (% trienes)/ 100 mol as defined by Kates and Hagen (1964) ND = Fatty acid not detected
To get the optimal performance in both unsaturation and saturation situations, a dynamic time slot allocation scheme of CQM protocol is proposed, based on traffic prediction.
Similar to the proof of Theorem 1, we obtain the unsaturation of the quantizer and the asymptotic convergence of the closed-loop system.
The fatty amides synthesized from the crude rice bran oil act as corrosion inhibitors, due to the high unsaturation content of their alkyl chains.
The molecular formula of compound 3 was determined to be [C.sub.21][H.sub.30][O.sub.8] (seven degrees of unsaturation) on the basis of HRESIMS analysis (m/z 433.1848 [[M + Na].sup.+]).
Addition of SLE and degree of unsaturation were the two major factors responsible for the changes in fatty acid composition.
This unsaturation level can be observed when analyzing the composition of fatty acids in baru oil (Table 1), which is rich in monounsaturated and polyunsaturated components.
They all contain some degree of unsaturation (double bonds) and hydroxyl/carboxyl functionality which are used to promote curing.