Pak. j. sci. ind. res. Ser. A: phys. sci. 2018 61A(3) 126-131
Studies of Chemical Constituents from Eremostachys loasifolia
Muhammad Imranab*, Uzma Rasheed Mughalc, Muhammad Iqbald, Riaz Hussaine,
Wasif Iqbalf, Rafy Yaqeeng and Sadia Ferheeng
a
Department of Chemistry, Ghazi University Dera Ghazi Khan, Pakistan
b
School of Chemistry, University of Bristol, United Kingdom
c
Departmentof Chemistry, GC University Faisalabad, Layyah Campus, Pakistan
d
Department of Biochemistry& Biotechnology, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
e
Departmentof Chemistry, University of Education Lahore, D. G. Khan Campus, Pakistan
f
Science of Dental Materials, Mohammad Bin Qasim Medical and Dental College, Port Qasim, Karachi, Pakistan
g
PCSIR Laboratories Complex, Karachi-75280, Pakistan
(received November 9, 2017; revised August 8, 2018; accepted August 15, 2018)
Abstract. The chemical constituent analysis on the whole plant Eremostachys loasifolia (Family: Lamiaceae)
resulted 13 compounds of flavonoids class for the first time from this species namely Loasifolin (1),
Eremoside A (2), Eremoside B (3), Kaempferol (3,4',5,7-tetrahydroxyflavone) (4), 5-Hydroxy-6,7,8,4'tetramethoxyflavone (5), 5-Hydroxy-3',4',6,7,8-pentamethoxyflavone (6), Apigenin (4',5,7-trihydroxyflavone)
(7), Luteolin (3',4',5,7-tetrahydroxyflavone) (8), Apigenin 7-O-b-D-glucopyranose (9) 4-Methyl Kaempferol
(3,5,6-trihydroxy-4methoxy flavone) (10) 5-Hydroxy-7,4-dimethoxy flavones (11), 6,7-Dimethoxy-4,5hydroxyflavone (12), 3,5,7-Trihydroxy-3´,4´-dimethoxyflavone (13). Further, all isolated compounds
showed antioxidant activity. The structures of isolated compounds were determined using different
spectroscopic techniques including NMR, UV/Vis., IR and MS.
Keywords: Eremostachys loasifolia, antioxidant activity, flavonoids
pounds are Loasifolin (1), Eremoside A (2), Eremoside
B (3), Kaempferol (3,4',5,7-tetrahydroxyflavone) (4),
5-Hydroxy-6,7,8,4'-tetramethoxyflavone (5), 5-Hydroxy3',4',6,7,8-pentamethoxyflavone (6), Apigenin (4',5,7trihydroxyflavone) (7), Luteolin (3',4',5,7-tetrahydroxyflavone) (8), Apigenin 7-O-b-D-glucopyranose (9) 4'Methyl Kaempferol (3,5,6-trihydroxy-4methoxy flavone)
(10) 5-Hydroxy-7,4-dimethoxy flavones (11), 6,7-Dimethoxy-4,5-hydroxyflavone (12) and 3,5,7-Trihydroxy3´,4´-dimethoxyflavone (13). The structures of all
isolated compounds are showed in Fig. 1.
Introduction
The plant genus Eremostachys is member of the family
Labiatae (Lamiaceae) which comprises of eighty species
and distributed in mostly Afghanistan and Russia region
(Li and Hedge, 1995). Plants of this genus are used for
medicinal purpose in China and Asia for the purpose
of local analgesic, for the treatment of allergies,
headache, liver diseases and skin diseases (Ali and
Nasir, 1990). The genus compounds also show strong
antidepressant activity, cytotoxic activity and free radical
scavenging activity (Delazar et al., 2004a; 2004b).
Eremostachys loasifolia is one of the important species
of this genus that can be found in Balochistan, and in
the northern province of Pakistan. The previous study
of the genus showed the presence of essential diterpenes,
iridoids, fatty acids, oils, flavonoids, and aromatic glucosides (Modaressi et al., 2009; Muhammad et al., 2006;
Said et al., 2002). In this plant previously, no systematic
pharmacological studies have so far been carried out
and therefore chemical analysis of this species was
studied because of its medicinal importance. From the
results of present experimental work thirteen flavonoids
isolated for the first time from E. loasifolia. The com-
Materials and Methods
The Al precoated sheets (Merck diameter 20 × 20 cm,)
with silica gel were used for TLC and stationary phase
in glass column for chromatographic (230-400 and 80200 mesh size) silica gel was used. Hitachi UV-3200
spectrometer for the TLC spot location determination
was used under wavelength at 254 and 366. Polarimeter
DIP-360 JASCO was used for the determination of
optical rotations of the compounds. Infra Red 460
Shimadzu spectrometer were recorded for IR. JMSHX-110 mass spectrometers were used for EI-MS and
HR-EI-MS measurement, Bruker spectrometers (400
MHz) for the the proton-NMR,13C-NMR. The activity
*Author for correspondence:
E-mail: imranchemist@gmail.com
126
127
Chemical Constituents from Eremostachys loasifolia
i.e., antioxidant of all isolated compounds1-13 was
carried out by the same protocol as described in discussion (Wavy et al., 2003; Yoshi Rawa et al., 2002).
chloroform:methanol was re-chromatographed over
FCC and eluted with chloroform:methanol to obtain
(2) and (3).
Plant material. Eremostachys loasifolia complete plant
was collected from Lakpass, Quetta Valley, Balochistan,
Pakistan and identified by Balochistan University, Plant
Taxanomist, where No. el. Rbt. 01. 2005 (specimen
voucher) was alloted in the departmental herbarium.
Loasifolin (1), Eremoside A (2), Eremoside B (3), for
these new compounds spectroscopic data are already
published (Mughal et al., 2010) but activity are reported
first time. The data including both physical and spectral of compounds 4-13 were comparable with the
literature values (Imran et al., 2012; Ahmed et al.,
2006; Sadikum et al., 1980; Redalli et al., 1980;
Dawson et al., 1966).
Extraction, fractionation and purification. Freshly
collected Eremostachys loasifolia plant (20 kg) was
dried and extracted at r.t with ethanol (4 ´ 30 L, 08
days each). 750 g residue was attained from these
combined ethanolic portion after reduced pressure
evaporation (400 g). The ethanolic plant residue 750 g
was dissolved in water (500 mL) and further extracted
into petroleum ether (80 g), CH2Cl2 (65 g), ethyl acetate
(105 g), n-butanol (164 g) and H2O soluble portion.
Ethyl acetate (105 g) soluble portion was exposed to
chromatography separation FCC as stationary phase
silica gel (different mesh size) and mobile phase
petroleum ether, chloroform and methanol depending
upon polarity of constituents. From first large column
five major fractions obtained namely E1 to E-5. The E1 fraction was chromatographed over FCC silica gel
and obtained three fractions (A-1 to A-3). The (4.0:6.0)
petroleum ether:CHCl3 fraction A-1 on further chromatography gives (4).
The E-2 portion (7.0:3.0) petroleum ether-CHCl3 was
finally purified by CC via solvent (2.3:7.7) system
petroleum ether -CHCl3 giving compounds 5 and 6.
The petroleum ether-CHCl3 (1.0:9.0). The portion E3 was chromatography using eluting system (1.5:8.5)
with petroleum ether -CHCl3 to pay for 7 and two
compounds mixture that was separated by preparative
TLC (1.8: 8.2) solvent petroleum ether -CHCl3 to give
compound 8 and 9. The (9.8:0.2) CHCl3: MeOH fraction
A-2, gives compound 10. The third fraction hexane and
chloroform (8.5:1.5) upon further FCC analysis gives
compound 11. The fraction E-4 obtained from (9.5:0.6)
Chloroform-MeOH was chromatographed using eluent
system (9.3:0.7) Chloroform-MeOH to afford 12 (9
mg) and (9.2:0.8) 13 (11 mg).
The fraction E-5, obtained from pure chloroform was
subjected to FCC give rise to three sub fractions. The
first fraction further chromatographed by (7.5:2.5) of
chloroform: methanol mobile phase solvent system
gives pure compound 1. The second portion (9.8:0.2)
Results and Discussion
The chemical constituents were extracted with ethanol
and then crude extract (ethanol) was suspended in water
and partitioned into petroleum ether, CH2Cl2, EtOAc,
n-BuOH and water fractions on the basis of respective
solubility. Further analysis especially chromatographic
were performed on EtOAc portion because of its strong
crude activity. Series of column and flash chromatographic analyses were performed on the EtOAc soluble
part and as a result 13 compounds separated and
identified. These are namely, Loasifolin (1), Eremoside
A (2), Eremoside B (3), Kaempferol (3,4',5,7-tetrahydroxy-flavone) (4), 5-Hydroxy-6,7,8,4'-tetramethoxyflavone (5), 5-Hydroxy-3',4',6,7,8-pentamethoxy-flavone
(6), Apigenin (4',5,7-trihydroxy-flavone) (7), Luteolin
(3',4',5, 7-tetrahydroxy-flavone) (8), Apigenin 7-O-bD-glucopyranose (9) 4-Methyl Kaempferol (3,5,6trihydroxy-4-methoxy-flavone) (10) 5-Hydroxy-7,4'dimethoxy-flavones (11), 6,7-Dimethoxy-4',5-hydroxyflavone (12), 3,5,7-Trihydroxy-3´,4´-dimethoxy-flavone
(13). The purified flavonoids showed antioxidant
properties (Table 1). The structures of all isolated
compounds were shown in Fig. 1.
The structures of compounds 1-3 were already published
in detail with our previous articles. 5 compound
Kaempferol (4) was obtained as light yellow powder
from EtOAc-soluble part. It UV (lmax) spectrum and
IR (cm-1) spectrum absorption bands are the typical
flavonoidal nature. The HREI-MS showed the molecular
ion peak at m/z 286 consistent with the formula C15H10O6.
Furthermore, the 1H NMR spectrum indicated the
presence of para-substituted benzene ring with AA'BB'
pattern. The 13C NMR (BB and DEPT) spectra showed
the characteristic signals of a flavonoidal skeleton. On
the basis of these evidences and comparison with
published data its named as Kaempferol.
128
Muhammad Imran et al.
Compound (5) was obtained as yellow crystalline powder
from the chloroform portion. It gave violet colour with
FeCl3 for a phenol. The UV (lmax) spectrum and IR
(cm-1) spectrum showed absorption bands of aromatic
moieties. The EI-MS showed the fragment peaks at m/z
358. The HREI-MS showed the molecular ion peak at
m/z 358 indicating the molecular formula C19HI807.
From 1 H-NMR spectrum data presence of para
substituted ring revealed. Furthermore the presence of
four methoxy moieties were also observed at d 3.84,
3.87, 3.90 and 3.93. The 13C-NMR (BB and DEPT)
spectra showed well resolved total nineteen carbon
signals comprising four methyl, five methine and ten
quaternary carbon atoms.
Compound (6) was obtained as yellow solid from the
EtOAc soluble part. It gave violet colour with FeCl3
for a phenol. The UV (lmax) spectrum and IR (cm-1)
spectrum absorption bands indicating aromatic skeleton.
The high resolution EI-MS showed the molecular ion
peak at m/z 388 which deduced the molecular formula
C20H2008. Its 1H-NMR showed at the aromatic(ABX
system) region i.e., of five methoxyl protons and four
protons in the. The 13C-NMR showed well resolved
total twenty signals comprising of 11 quaternary carbon,
4 methine and 5 methyl atoms.
Compound (7) was obtained as pale yellow form from
the CH3Cl portions showing violet colour with FeCl3
Table 1. Antioxidant activity of compounds 1-13
Compound
DPPH assay
(IC50)a
Cytochrome-c reduction
assay (IC50)a
(µM)
1
2
3
4
5
6
7
8
9
10
11
12
13
Gallic acidb
25.3
33.1
32.5
24.2
26.1
26.3
23.9
24
25.7
25.1
25.9
26.1
24.8
20.9
24.1
26.5
25.1
23.2
24.2
24.1
23.2
23.5
23.9
23.5
24.5
25.2
23.1
17.3
a
= results in IC50 values (µM); b = positive control.
All analysis were average of four experiments.
for a phenol. The UV (lmax) spectrum and IR (cm-1)
spectrum showed presence of flavone moieties. The
molecular ion peak observed at m/z 270 showing the
molecular formula C15H10O5. The para-disubstituted
benzene ring as an AA'BB' pattern observed in its 1HNMR spectrum. Its 13C-NMR spectra showed the typical
carbon pattern of flavonoid.
The compound (8) was obtained as light yellow powder
from the CH3Cl portions giving violet colour with FeCl3
for a phenol. The UV (lmax) spectrum and IR (cm-1)
spectrum absorption bands absorption bands of
conjugated aromatic system. The MS spectra in hard
ionization mode showed the molecular ion peak at m/z
286 which deduced the molecular formula C15H10O6.
The tri-substituted ring pattern was observed in its 1HNMR spectrum. The 13C-NMR showed fifteen carbon
15 signals consisting of 9 quaternary and 6 methine
carbon atoms.
Compound (9) was obtained as a yellow amorphous
powder. The UV (lmax) spectrum and IR (cm-1) absorption
bands were similar to flavone. The MS gives M.F
C21H21O10 showing peak at m/z 433. The chelated
hydroxyl group observed in its IH-NMR spectrum
because of H-bonding. The sugar moiety in b configuration were also observed. The 13C-NMR spectra
showing twenty one carbon signal out of these 1
methylene 12 methine and 8 quaternary carbons.
Compound (10) was obtained as a light yellow solid.
Its mass spectra of showed molecular ion peak at m/z
300 with the molecular formula C16H12O6. The UV
(lmax) spectrum and IR (cm-1) spectrum absorption bands
absorption bands of flavone system. The total six signals
of H with ring B is symmetrical, free methoxyl group
at position C-4 in the downfield region in its 1H-NMR
spectra.
Compound (11) was obtained as a light yellow solid.
Its mass spectra of showed molecular ion peak at m/z
298 with M.F C17H14O5. The UV (lmax) spectrum and
IR (cm-1) spectrum absorption bands absorption bands
of flavone skeleton. The seven signals of H in the
downfield region i.e., aromatic in its 1H-NMR spectra.
The EI-MS data of compound (12) showed molecular
ion peak at m/z 314. Its molecular formula observed
in HREI-MS 314 with the M.F C17H14O6. The UV (lmax)
spectrum and IR (cm-1) spectrum absorption bands
absorption bands of benzene rings. The six signals of
H in the downfield region i.e., aromatic in its 1H-NMR
spectra.
Chemical Constituents from Eremostachys loasifolia
Compound (13) showed the UV (lmax) spectrum and
IR (cm-1) spectrum absorption bands absorption bands
of aromatic species. Its EI-MS confirmed M.F as
C17H14O7 showing mass peak at m/z 330. The two OCH3 signals and five H present in the aromatic region
in its 1H-NMR. The 17 carbon signals were observed
in 13C-NMR spectra including ten quaternary five
methine, and two methyl carbons. All the physical and
spectral data of isolated compounds correspondence
with the published data (Imran et al., 2012; Ahmed
et al., 2006; Sadi Rum et al., 1980; Redalli et al., 1980;
Dawson et al., 1966).
Antioxidant activity of compound 1-13. The determination of antioxidant activity of compounds 1-13, DPPH
followed by cytochrome-c-reduction tests were followed.
The TPA-induced (HL-60 cell culture system) free
radical formation with the positive control and showed
free radical scavenging activity in the DPPH assay
(Wavg et al., 2003; Yoshi Rawa et al., 2002). All isolated
compounds showed significant antioxidant activity
compared against standards (Table 1).
Spectral data. Kaempferol (3,4',5,7-tetrahydroxyflavone) (4). EI-MS m/z:286; HREI-MS: m/z 286.0488
[M]+(calcud. for C15H10O6, 286.0474). Light yellow
powder (19 mg) M. P: 277 °C ; UV (MeOH) 213, 267,
337; IR (KBr) umax cm-1: 3417, 2928, 1661, 1611 and
1178; 1H NMR (500 MHz CD3OD) (dppm): (J in Hz)
6.95 (d, H each, J = 8.6, H-3'5'), 6.37 (d, H, J = 2.1, H8), 8.06 (d, 1H each, J = 8.6, H-2'6'), 6.18 (d, H, J =
2.0, H-6).
5-Hydroxy-6,7,8,4'-tetramethoxyflavone (5). EI-MS
m/z (rel. int.): 358; HREI-MS m/z: 358.1043 (calcud.
for C19H18O7, 358.1049). Yellowish solid (23); M.P:
181 °C; IR (KBr) nmaxcm-1: 3345, 1600, 888; 1H-NMR
(300 MHz CDCl3,) d: (J in Hz) 12.61 (OH), 6.61 (s, H,
H-3), 7.88 (d, twoH, J = 10.0 Hz, H-2'6'), 7.03 (d, twoH,
J = 10.2, 3.0, H-3'5'), 3.94, 3.91, 3.86, 3.85 (s, each
tweleveH, -OCH3-6, 7, 8, 4').
5-Hydroxy-3',4',6,7,8-pentamethoxyflavone (6). EIMS m/z: 388; HREI-MS m/z: 388.1153 (calcud. for
C20H20O8, 388.1158). Light yellowish crystal; (25 mg);
M.P: 146 °C; IR (KBr) nmaxcm-1: 3511, 1681, 1575; 1HNMR (500 MHz C5D5N,) d: (J in Hz) 13.26 (5-OH)6.85
(s, H, H-3), 7.87 (d, H, J = 2.1, H-2'), 7.11 (d, H, J =
8.6, H-5'), 7.92 (dd,H, J = 8.5, 2.0 Hz, H-6'), 3.58, 3.99,
3.83x3, 4.00, (15H, s, -OCH3-6, 7, 8, 3', 4').
Apigenin (4',5,7-trihydroxyflavone)(7). EI-MS m/z:
270; HREI-MS: m/z 270.0525 [M]+ (calcud. for C15H10O5,
129
270.0527). Yellow powder (35 mg) Melting point: 314
°C; UV(MeOH) 338, 266, 214; IR (KBr) umax cm-1:
3416, 1670, 1610 1179; 1H-NMR (500 MHz C5D5N,)
(dppm), (J in Hz) 7.21 (d, H each, J = 9.1, H-3'5'), 6.92
(s, H, H-3), 7.91 (d, H each, J = 9.2, H-2'6') 6.81 (d,
1H, J = 2.1, H-8), 6.75 (1H, d, J = 2.0 , H-6).
Luteolin (3',4',5,7-tetrahydroxyflavone) (8). EI-MS
m/z: 286; HREI-MS: m/z 286.0475 [M]+ (calcud. for
C15H10O6, 286.0469). Light yellow powder (21 mg);
Melting point: 324 °C ;UV (MeOH)351, 259, 211; IR
(KBr) umax cm-1: 3426, 1674, 1607; 1H-NMR ,(300 MHz
(CD3OD) (dppm): (J in Hz) 7.37 (dd, H, J = 9.1, 2.2,
H-2'), 6.87 (d, H, J = 9.1, H-3'), 7.39 (d,H, J = 2.1 H6'), 6.52 (s,1H), 6.41 (d, H, J = 2.2, H-8), 6.75 (d, H,
J = 2.2, H-6).
Apigenin 7-O-b-D-glucopyranose (9). EI-MSm/z: 270
[M-glucose]+; HRFAB-MS: m/z 433.1139 [M+H]+
(calcud. for C21H21O10, 433.1128). Pale Yellow (30 mg);
Melting point: 228 °C; UV(MeOH) 337, 265, 215; IR
(KBr) umax cm-1: 3425, 1668, 1637, 1618; 1H NMR (500
MHz C5D5N,) (dppm): (J in Hz) 7.21 (d, H each, J =
9.1, H-3'5'), 7.86 (d, H each, J = 9.1, H-2'6'), 7.08 (d,
H, J = 2.1, H-8), 6.88 (s, H, H-3), 6.84 (d, H, J = 2.1,
H-6), 5.85 (d, H, J = 7.5, H -1"), 4.57 (dd,H, J = 1.6,
1.6, H -6"), 4.37 (dd, H, J = 1.6, 1.6, H -6"), 4.40 (H,
m, H -3"), 4.35 (m, H, H -2"); 4.23 (m, H, H -5"),4.35
(m, H).
4'-Methyl Kaempferol (3,5,6-trihydroxy-4methoxy
flavone) (10). El-MS m/z: 300.2; HREI-MS: m/z
300.0541 (calcud. for C16H12O6; 300.0634). White
crystals (18 mg); M.P 227 °C; UV (MeOH): 287, 327;
1
H-NMR (500 MHz CDCl3,) d: (J in Hz) 3.92 (s,
threeH, OCH3) 7.25 (d, twoH, 9.1, H-3', 5'), 7.95 (d,
twoH, 9.1, H-2', 6'),6.94 (br.s, H, H-8), 6.87 (br. s, H,
H-6).
5-Hydroxy-7, 4'-dimethoxy flavones (11). HREIMS; /z
298.0625 (calcud. for C17H14O5, 298.0839), Yellow solid
(26 mg); M.P. 174 °C; UV (MeOH): 270, 328; 1H-NMR
(400 MHz CDCl3,) d: (J in Hz) 3.87 (s, 3H, OCH3 at
C-7) and 3.86 (s, 3H, OCH3); 7.25 (d, H, J = 9.2, H2',6'), 7.01 (d, twoH, J = 9.1, H-3',5'), 6.57 (s, H, H-3),
6.45 (d,H, J = 2.1, H-8), 6.35 (d, H, J =2.1, H-6).
6, 7-Dimethoxy-4',5-hydroxyflavone (12). EI-MS m/z:
314; HREI-MS: m/z 314.0769 [M] + (calcud. for
C17H14O6; 314.0788). Yellowish crystals (15 mg); M.P.
201 °C; UV (MeOH): 215, 274, 343; IR (KBr) nmax
cm-1: 3456, 1671, 1182; 1H-NMR (400 MHz CDCl3,)
d: (J in Hz) 3.99 (threeH, s, OMe), 3.87 (3H, s, OMe)
130
Muhammad Imran et al.
OH
3'
(1)
HO
8
H3CO
8
HO
2
OH
4'
4'
1'
O
9
7
2'
3'
(7)
7
1
10 O
1'
2
5'
5'
6'
6'
6
3
10
5
OH
6'
HO
4'
O
1'
6'
5'
10
1
O 2 1'
4
6
OH
3'
OH
9
O
OH
9
4
5
3
5
7
4'
2'
6
O
1
8
HO
6''
H
10
8
7
H
HO
O
5'
(8)
O
2'
OH
O
2''
HO
(9)
OH
4''
OH
5''
O
1''
4'
HO
HO
OH
3''
5'
6'
HO
6'
5'
O
1
10 O
8
O
3'
2'
HO
7
MeO
6
H
2'
3'
MeO
HO
O
1'
4'
6''
H
10
HO
O 5''
O
1''
HO
8
10
O
HO
OH
O
4' OH
2'
7
2''
OH
4''
OH
3'' OH
OCH3
OH
3'
(4)
HO
(10)
O
1
8
6'
5'
O
3
5
9
7
(11)
1
O 2 1'
6'
4
9
H3CO
1
O 2
7
OH
5
5
6
OH
4'
2'
OCH3
5'
3
6
3'
3
4
9
OH
4
6
1'
4' OH
2'
5
MeO
2
1'
H
(3)
3
O
(2) MeO
3'
4
9
5
4
OH
MeO
6
OCH3
1'
3
O
OH
3'
(5)
OCH3
8
H3CO
7
4'
2'
(12)
1'
O
9
6'
6
H3CO
H3CO
4'
2
5'
2
O
OCH3
1
O 2
7
OH
1'
3
10
4
5
H3CO
O
OH
3
6
OH
(6)
2'
OCH3
H3CO
8
7
9
OCH3
3'
4'
OCH3
1'
O
5'
2
O
(13)
HO
O
O
6'
H3CO
6
3
10
OH
OH
4
5
O
Scheme 1. Structures of Isolated Compounds (1-13).
OH
O
Chemical Constituents from Eremostachys loasifolia
7.02 (twoH, d, J = 8.8, H-3',5') 7.83 (twoH, d, H-2',6')
and 6.58 (twoH, s, H-8, H-3).
3,5,7-Trihydroxy-3',4'-dimethoxyflavone (13). EI-MS
m/z: 330; HR-EI-MS m/z: 330.0741 (calcud for C17H14O7,
330.0739). Yellow powder 933 mg; UV (MeOH): 269
and 370; IR (KBr) nmax cm-1: 3275, 1651, 1609 and 867;
1
H-NMR (300 MHz CDCl3,): d: (J in Hz) 3.85 (threeH,
s, OMe), 3.74 (threeH, s, OMe); 7.65(d, H, J = 1.9 H2'), 7.60 (dd, H, H-6'), 6.35 (d,H, J = 2.2, H-8), 6.19
(d, H, J = 2.2 H-6) and 6.84 (d, H, J = 8.7, H-5').
Conclusion
Bioassy guided separation of secondary metabolites
freshly collected from Eremostachys loasifolia plant
was carried out first time with the aid of advanced
chromatographic and spectroscopic techniques. This
study gives thirteen mostly flavonoids metabolites
showing significant antioxidant activity. All physical
and spectral data of isolated compounds were comparable
with already reported structures. This study opens
window of opportunity for further studies of medicinal
purpose of the plant Eremostachys loasifolia.
References
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