In the FTIR spectra Increases in the area of the OH groups and the changes in the region of the carbonyl group
indicated that the microorganisms present in the basal medium may be favoring chain scission PP generating hydrolysis product of grafted monomers.
Non substituted carbons (C-8 and C-9) arranged their signals at 137.6 and 136.1 ppm referring to different effect of the carbonyl group
on each of them.
This behavior can be related to a large number of carbonyl groups
(C = O) 1208-1256 [cm.sup.-1], typical for aryl-OH present in the eucalyptus extract, or aryl-O-C[H.sub.2] present in the peel extract of coconut and cocoa.
According to the reaction mechanism between ketone carbonyl groups
and primary amines, the ketone carbonyl groups
embedded onto the acrylic resin side chains would react with free primary amino groups from the protein polypeptide at room temperature.
Mechanism of action of lipaseAfter lipase has bound to the substrate to form the enzyme-substrate complex, Ser163, in the reaction's rate determining step, nucleophilically attacks the carbonyl group
to form the complex known as the tetrahedral intermediate (covalent catalysis).
This model was less successful at predicting the stereochemistry resulting from the reduction of carbonyl groups
in the enzyme.
In the [sup.13]C NMR spectra, the signals at 199.8 to 193.4 ppm, 168.3 to 167.1 ppm, and 168.1 to 167.0 ppm corresponding to ketone, carboxylic, and amide carbonyl groups
On TLC the compound gave a violet spot with p-nitroaniline spray reagent indicating that it is either phenolic or enolic, a dark brown colour with anisaldehyde spray reagent and a bright yellow colour with, 2,4 DNP spray reagent, suggesting that a carbonyl group
might be present.
These two peaks corresponded to carbonyl group
and formation of double bonds as a result of breakdown of polymer chain.
The effect of the pBQ concentration on the heterogeneous attraction of the hydroxyl group of chitin to the carbonyl group
of the pBQ was investigated.
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The first group is covalently bound to the second group via an additional carbonyl group
. The second group is covalently bound to the spacer group S or to another radiation activatable group.