Page 63 - Kutnar, Andreja, et al., eds., 2015. Proceedings of the 1st COST Action FP1307 International Conference - Life Cycle Assessment, EPDs, and modified wood. University of Primorska Press, Koper.

lower
phenolic
and
flavonoid
contents
on
crude
extract
could
be
explained
by
the
presence
of

impurities
such
as
organic
acids,
which
can
interfere
with
the
determination
of
the
chemical

composition
(Chirinos
et
al.
2007).
The
butanolic
fraction
exhibited
the
most
effective
DPPH

scavenging
capacity,
followed
by
ethyl
acetate
fraction
and
crude
extract.
According
to
Dudonné

et
al.
2009,
the
presence
of
phenolic
compounds
in
the
plant
contributes
strongly
to
their

antioxidant
ability.
Following
the
TGA
analysis,
the
first
step
of
decomposition
in
all
extracts

corresponded
to
dehydration
(<180°C).
In
crude
extractives,
the
degradation
process
occurred
at

250°C
and
at
400°C,
while
the
fractions
showed
a
main
step
approximately
at
300°C
(Fig.
1).
This

difference
may
be
due
to
decomposition
of
crude
extractives
in
different
fractions
of
compounds

(Ross
et
al.
2009).
The
results
of
decay
test
are
ongoing,
but
as
a
preliminary
report
the
antifungal

activity
found
in
the
impregnated
samples
is
related
to
the
presence
of
phenolic
compounds
in

the
O.
acutifolia
leaves
extracts.

Figure
1:
Thermogravimetric
analysis
of
O.
acutifolia
leaves
extracts.

References

Chirinos
R.,
Rogez
H.,
Campos
D.,
Pedreschi
R.,
Larondelle
Y.
2007.
Optimization
of
extraction
conditions
of

antioxidant
phenolic
compounds
from
mashua
(Tropaeolum
tuberosum
Ruíz
&Pavón)
tubers.

Separation
and
Purification
Technology,
55:
217–225.

Dudonné
S.,
Vitrac
X.,
Coutière
P.,
Woillez
M.,
Mérillon
J-­‐M.
2009.
Comparative
Study
of
Antioxidant

Properties
and
total
phenolic
content
of
30
plant
extracts
of
industrial
interest
using
DPPH,
ABTS,
FRAP,

SOD,
and
ORAC
assays.
Journal
of
A
gricultural
and
Food
Chemistry,
57:
1768–1774.

Egua
M.
O.,
Etuk
E.
U.,
Bello
S.
O.,
Hassan
S.
W.
2014.
Antidiabetic
potential
of
liquid-­‐liquid
partition

fractions
of
ethanolic
seed
extract
of
Corchorus
olitorious.
Journal
of
Pharmacognosy
and
Phytotherapy,

6,
1:
4-­‐9.

Ross
A.
B.,
Anastasakis
K.,
Kubacki
M.,
Jones
J.
M.
2009.
Investigation
of
the
pyrolysis
behavior
of
brown

algae
before
and
after
pre-­‐treatment
using
PY-­‐GC-­‐MS
and
TGA.
Journal
of
Analytical
and
Applied

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85:
3-­‐10.

Acknowledgments

The
authors
are
grateful
for
the
scholarship
of
Brazilian
National
Counsel
of
Technological
and

Scientific
Development
(CNPq)
and
for
the
financial
support
of
the
Basque
Government
(project

IT672-­‐13).

51