methoxyl


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methoxyl

[mə′thäk·səl]
(organic chemistry)
CH3O‒ A functional group which is univalent.
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Considering the absence of a methoxyl C signal, the width of the signal band (90-140 ppm) and the composition of the pyrolysis fingerprint, this aromatic signal originates from BC (see also Skjemstad et al.
The degree of esterification is also shown in Table 3, and the values found are similar, identifying the homogeneous group of high methoxyl pectin with an average DE of 72.
A methoxyl (also produced by [alpha]-amino groups) carbon signal at 56 ppm and several signals in the aryl C region (110-165 ppm) indicated the presence of lignin and/or that of hydrolysable tannin.
CP Kelco's investment in Skensved supports production of Low Methoxyl Amidated (LMA) specialty pectin.
In fact, compound 6, having methoxyl groups at C-8 and C-9, found at C-7 and C-8 in compound 4, exhibited low cytotoxicity.
This may be caused in the low activation potential within methoxyl groups by laccase or LMS treatment (Euring et al.
In detail, there is no absorption of methoxyl group in both spectra, suggesting that silicon monomers have been hydrolyzed very well.
However, substitution of the hydroxyl groups at the 3- and 5-position with methoxyl groups as in syringic acid reduces the activity .
The sharp peak at ~56ppm is probably due to methoxyl C, which is also commonly associated with lignin structures.
Apparently the hydroxyls present in the mammalian alkaloids and absent in their methoxyl analogs play a role in binding to the chiral selector.