TEMPO-Oxidized Spruce Galactoglucomannan–Biopolymer with Enhanced Antioxidant Activity and Selective Heavy-Metal Sorption
Antioxidants,
Journal Year:
2025,
Volume and Issue:
14(5), P. 569 - 569
Published: May 9, 2025
This
study
examines
galactoglucomannan,
a
well-studied
biopolymer
isolated
from
Siberian
spruce
(Picea
obovata
Ledeb).
Due
to
its
structure,
abundant
with
hydroxyl
groups,
galactoglucomannan’s
properties,
such
as
heavy-metal
ion
affinity,
are
considered
be
mediocre.
Nevertheless,
there
various
ways
enhance
functionality
via
oxidative
TEMPO/NaBr/NaOCl
processing.
work
is
concerned
the
determination
of
oxidation
effect
on
structure
and
performance
thermal
decomposition
behavior,
antioxidant
activity,
selective
sorption.
In
results,
TEMPO-oxidized
galactoglucomannan
yields
vary
in
range
78.3
±
6.4
wt.%.
The
carboxylate
group
oxidized
derivative
represents
up
0.084
g/1
g
sample.
According
activity
tests,
exceeds
initial
sample
terms
radical
scavenging
ability.
spectral
characteristics
samples
reveal
differences
absorption
units
(1725,
1610,
1371
cm−1).
preservation
polymeric
was
confirmed
by
gel
permeation
chromatography
analysis
results.
capacity
higher
for
derivative,
which
demonstrated
Cd2+,
Fe2+,
Cu2+,
Pb2+
adsorption
values
166.8
mg/g,
142.8
150.0
199.2
accordingly.
obtained
result
competitive
also
form,
characterized
summary
143.1
mg/g
capacity.
Language: Английский
Comparison of Сore‐Shell Colloids of Silver and Gold Nanoparticles Capped by Arabinogalactan
Particle & Particle Systems Characterization,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 31, 2024
Abstract
Ecologically
friendly
green
synthesis
of
plasmonic
silver
and
gold
nanoparticles
with
the
help
polysaccharides
acting
both
as
reducing
capping
agents
became
popular
nowadays
due
to
numerous
applications
such
nanobiocomposites.
However,
formation
their
core‐shell
structures
is
not
at
all
clear.
The
Au
Ag
(NP)
synthesized
Siberian
Larch
arabinogalactan
(ARB)
compared.
series
ARB@AgNP
studied
respect
metal
content
by
light
scattering
(static,
dynamic,
electrophoretic
one),
transmission
electron
microscopy,
FT‐IR,
UV–vis.
spectroscopy.
results
are
compared
those
ARB@AuNP
(
J.
Phys.
Chem
C
2011,
115,
24627).
Higher
redox
potential
3+
ions
responsible
for
thicker
shells
oxidized
hydrolyzed
ARB
surrounding
AuNPs
more
negative
zeta‐potentials
these
colloids.
Contrary
colloids
single
spherical
AgNP
in
core,
contained
a
fraction
AuNP
dumbbells
depolarization
scattered
light.
position
slipping
plane
which
determined
attributed
hydrodynamic
radii
R
h
).
Thus,
decrease
explained
growth
.
Language: Английский