The presence of a hydroxyl group
on the molecular chain will improve the molecule's hydrophilicity [13,14], and thus its solubility, and can also inhibit the formation of macroporous structures in the membrane cross section .
* Improvements in moisture regain (more hydroxyl group
Figure 4(a) shows IR absorption bands of stretching vibration of the hydroxyl group
(OH), 3600-3100 [cm.sup.-1] of LDPE films exposed to C[O.sub.2] laser radiation at different fluencies and PE-BIO without exposure to C[O.sub.2] laser radiation.
Namely, compounds which possess the hydroxyl group
in position C2 have IHB between hydrogen atom of the hydroxyl group
and carbonyl oxygen of the carboxyl group.
This study has compared the bioactivities of 14 different compounds comprising three structural variations of flavonoids which are flavones (absence of hydroxyl group
at position 3), flavonol (presence of hydroxyl group
at position 3), and flavanol (absence of double bond and ketonic group at positions 2-3 and 4, resp.) (Figure 4).
The carbon carrying free hydroxyl group
(C-3, C-4, and C-11) was unequivocally distinguished from the others (C-2, C-4a, and C-10b) by the deuterium induced differential isotope shift (DIS) measurement.
9,168,218 B2; L'Oreal has patented a composition that contains photoluminescent polymer (PLP), which is a polyester synthesized from a multifunctional monomer containing two carboxylic acid groups and a functional moiety comprising a carboxylic acid group or a hydroxyl group
, and a diol.
The hydroxyl groups
on C2 and C3 of the glucose units are located at the top of the torus and the hydroxyl group
on C6 is located at the base of the torus.
The team, which includes chemistry professor Stephen Hanessian, initially examined the possibility of simply removing a hydroxyl group
from neomycin to limit the effectiveness of the aminoglycoside-inactivating enzyme.
Preliminary experiments have provided evidence for an unusual mechanism of modular polyketide synthase chain release in enacyloxin biosynthesis, involving intermolecular condensation of an acyl carrier protein (ACP)-bound thioester with the C-3 hydroxyl group
of (1R, 3R, 4S)-3,4-dihydroxycyclohexane carboxylic acid (DHCCA).
The researchers synthesized gold nanoparticles whose surfaces were modified with various functional groups: a positively-charged amino group (-NH2), a negatively-charged carboxyl group (-COOH) or a neutral hydroxyl group
(1,8-10) In the case of this system, the formed film with high crosslinking density can be obtained due to the reaction between PIH and the active hydrogen (hydroxyl group
, amine group, or carboxyl acid) in the polymers.