DMDS adducts of the Z11 16 Me, Z11 14 Me and E11 14 Me exhibited the characteristic ion at m/z 245 as shown in Fig. 2. The double-bond positions of the methyl tetradecadienoate were identified as 9,11 by analysis of its MTAD derivatives that exhibited the diagnostic ions at m/z 351 (M+), 194 and 322.
In order to evaluate the influence of the double bond position on the antimycobacterial properties, we introduced a double bond at various positions of the side chain.
In summary, MS analysis revealed considerable variation in the carbon chain length, degree of unsaturation, positions of fatty acyl chains, and double bond positions of both the short chain and long chain fatty acyl components.
The bond position curve of the reinforced RAC beams was similar to that of natural aggregate concrete (NAC) beams subjected to bending and shear stresses before and after steel corrosion, with a sharp increase of the relative bond stiffness at both anchorage ends, and an almost linear decrease of relative bond stiffness in the range of 0.15 0.85 times the anchorage length.
The double-bond positions of FAMEs were determined by GC-MS analysis of DMDS adducts.
The double-bond positions of C16:1 and C20 1 were not identified.
In solids there are usually three or four longer secondary bonds surrounding the position of the lone pair as shown by the dashed lines in Figure 9b.
The following standard fatty acid nomenclature [35], briefly summed up by the following formula, is used throughout this article: A XωB, where A is the number of carbon atoms in the lipid chain; X is the number of double bonds; B is the position of the double bond from the methyl end.
In the IR range, with the increase of the number of carbon bonds, the positions of the CCC and CCH bending modes shift to lower energy, the latest converging rapidly to a fixed value of 620.5 cm−1 for an infinite length polyyne.
The environment in which the hydroxyl bond is situated (that is, primarily the extent of hydrogen bonding) determines the exact position of the absorbance band [ 19- 21].
