A 3-hydrogen singlet at I' 2.17 was correlated in HSQC spectrum with the carbon at I' 23.4, indicating an acetyl group
NAT2 is involved in the initial biotransformation metabolism of aromatic amines and hydrazines, and catalyzes the transfer of an acetyl group
from acetyl CoA to the nitrogen of the substrate (1,2).
The results indicated that ACHA was comprised of the ammonium group, the acetyl group
, and the other framework.
Analysis of the [sup.13]C NMR and HSQC spectra of 1 revealed the presence of an aromatic methyl at [[delta].sub.C] 20.2 (3-C[H.sub.3]), an acetyl group
([[delta].sub.C] 208.2 and 32.6) and ten aromatic signals of a naphthalene skeleton (Table 1).
Polyphenols share a common structural component: a phenol or an aromatic ring, usually two, with at least one hydroxyl, methyl, or acetyl group
linked via a three-carbon bond to form a six-unit heterocyclic ring.
The total uronic acids and acetyl group
contents (Figure 2), both hemicelluloses components, also showed negative correlation with harvesting age, especially for clone B.
For instance, tacking an acetyl group
onto the histone H3 protein at a specific spot is associated with increased gene activity, but switching the acetyl group
for a couple of methyl groups can reduce gene activity.
The presence of the acetyl group
in the xylan backbone hinders the complete degradation of hemicellulose; consequently, the removal of the acetyl group
is a very important step in many industrial applications which utilize plant biomass, including biofuel production systems (Biely, 1985).
Peak at 2.709 ppm as singlet confirms three protons of methyl group at 8 positions and peak at 2.504 ppm is due to three protons of acetyl group
as singlet at 4 positions in the molecule.
To determine the effect of the pyruvyl and acetyl group
on xanthan lyase activity, the crude xanthan substrate was purified and the acetylation and pyruvation extent of xanthan was determined as 9.7% and 15.3% respectively.
In our lab, a novel enzyme Acetoxcy Drug: Protein Transacetylase (TAase), catalyzing transfer of acetyl group
from various polyphenolic peracetate (PA) to certain receptor proteins such as cytochromes P-450, NADPH cytochrome reductase, nitric oxide synthase (NOS) has been established.
The only structural difference among these two compounds is that ATS has one acetyl group
at position 3 (C-ring), whereas QTS possesses a sulphate group at the same position, which is more polar than ATS.