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In vitro anti-inflammatory and antimicrobial activity of Securidaca
longepedunculata and Annona senegalensis hydro-alcoholic extract
Datagni G’massampou1*, Mouzou Aklesso Pouwelong1, Metowogo Kossi1, Afanyibo Yaovi-Gameli2, Sadji
Adodo2, Eklu-Gadegbeku Kwashie1
1 Research
Unit in Physiopathology - Bioactive substances and Safety / Laboratory of Physiology-Pharmacology / Faculty of Sciences / University of
Lomé, 01BP: 1515, Lomé, Togo
2 National
Institute of Hygiene of Togo, 26 Street Nangbéto, B.P 1396, Lomé, Togo.
Article Info:
_________________________________________
Article History:
Received 21 August 2021
Reviewed 29 September 2021
Accepted 05 October 2021
Published 15 October 2021
_________________________________________
Cite this article as:
Datagni G, Mouzou AP, Metowogo K, Afanyibo YG,
Sadji A, Eklu-Gadegbeku K, In vitro antiinflammatory and antimicrobial activity of
Securidaca longepedunculata and Annona
senegalensis hydro-alcoholic extract, Journal of
Drug Delivery and Therapeutics. 2021; 11(5-S):6370
DOI: http://dx.doi.org/10.22270/jddt.v11i5-S.5090
_________________________________________
*Address for Correspondence:
Datagni G’massampou, Research Unit in
Physiopathology-Bioactive substances and Safety/
Laboratory of Physiology-Pharmacology/Faculty of
Sciences / University of Lomé, 01BP: 1515, Lomé,
Togo
Abstract
______________________________________________________________________________________________________
Annona senegalensis and Securidaca longepedunculata are two plants traditionnaly used in
inflammation and wounds infection treatment after snakebites.
This study aims to investigate the in vitro anti-inflammatory and antimicrobial activities of
the hydroalcoholic extracts of Annona senegalensis and Securidaca longepedunculata.
Antimicrobial activity of the two plant extracts was examined against five bacterial strains
with the well diffusion method and the inhibition zones diameters (IZD), minimum inhibitory
concentration (MIC) and minimum bactericidal concentration (MBC) were determined using
the 96-well microplate dilution method. While antiinflammatory activity was assessed by the
albumin denaturation method.
The results obtained showed that the hydroalcoholic extract of Annona senegalensis has
antimicrobial property against Staphylococcus aureus (IZD=12.22 ± 0.24 mm, MIC=62.5
mg/mL, MBC=125 mg/mL) and against Pseudomonas aeruginosa (IZD=12.06 ± 0.06 mm,
MIC=125 mg/mL, MBC=250 mg/mL). Securidaca longepedunculata also showed its
antimicrobial activity against Staphylococcus aureus (IZD=12.03 ± 0.03 mm, MIC=125
mg/mL, MBC=250 mg/mL) and Candida albicans (IZD=12.12 ± 0.07 mm, MIC=62.5 mg/mL,
MFC=125 mg/mL).
In the order hand, Annona senegalensis and Securidaca longepedunculata exhibited
concentration-dependent anti-inflammatory activity by reducing significantly (p<0.001) the
denaturation of BSA. In addition S. longepedunculata inhibited haemolysis significantly
(p<0.001) more than Diclofenac sodium at 200 and 400 µg/mL.
Hence, it was concluded that Annona senegalensis and Securidaca longepedunculata
possessed anti-inflammatory and antimicrobial properties and can be used in the treatment
of inflammation and wounds infection after snakebites.
Keywords: Annona
antimicrobial, BSA.
INTRODUCTION
Inflammation and wound infection occuring after snakebite
complicate treatment of victims. To treat snake bites in
Africa, few victims use modern health facilities 1. The
microbes resistance to available antibiotics, the blow of
antibiotics and anti-inflammatory drugs available on the
market leads to the search for new therapeutic molecules
with antimicrobial and anti-inflammatory properties.
Medicinal plants are an adequate solution to these problems.
Victims often use medicinal plants. Annona senegalensis (A.
senegalensis) and S. longepedunculata are medicinal plants
used in envenomation management in Togo 2.
A. senegalensis is a small tree that is widely distributed in
Africa 3. It is usually 2 to 6 meters tall and has an aromatic
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senegalensis,
Securidaca
longepedunculata,
anti-inflammatory,
flower that is used to flavour foods. Its ripe fruit has a yellow
colour and a pleasant smell. It’s fruit is edible 4. Previous
studies have shown that this plant has anti venom 4, 5, anti
diarrhea 6, anti cancer 7, Spermatogenic 8, anti convulsion 9
properties. A methanol root extract has analgesic and antiinflammatory effects 10. Ethanol and methanol extracts from
roots, leaves and bark have antimicrobial effects 11.
Securidaca longepeduncula is also called «snake tree». It is a
7 m or 10 m tall shrub with a smooth bark and grey
branches. Its pink to purple flowers make it easy to
recognize during its flowering season 12. Previous studies
have shown that this plant has: antioxidant 13,
antiplasmodiale 14, antiparasitic 15 properties. The methanol
extract, petroleum ether fraction and methanol fraction have
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Journal of Drug Delivery & Therapeutics. 2021; 11(5-S):63-70
anti-inflammatory effects 16. The methanol extract and
chloroform fraction have antibacterial properties 17.
In vitro antimicrobial property of A. senegalensis and S.
longepedunculata extracts
The control of inflammation and wound infection caused by
snakebites is important in envenomation management. Antiinflammatory Medicinal plants are used to treat several
adverse effects of synthetic anti-inflammatory drugs.
Antimicrobial plants are the source of new molecules that
can counteract microbial resistance. The aim of this study is
to evaluate in vitro anti-inflammatory and antimicobial
properties of S. longepedunculata and A. senegalensis using
their hydroalcoholic extracts.
Microbial strains
Microbial suspensions preparation
MATERIAL AND METHODS
Plants materials
Roots of A. senegalensis were collected from Gblainvié in Zio
prefecture (Togo), located at 30 km north of Lomé. The roots
of S. longepedunculata were collected from Anié locality in
the prefecture of Anié (Togo). This locality is located 187,7
Km north of Lomé.
Both plants have been identified in Botany and Plant Ecology
Laboratory of Faculty of Science (University of Lome), where
voucher specimen was deposited in the herbarium under the
number TOGO 15673 (A. senegalensis) and TOGO 15676 (S.
longepedunculata).
Roots of the plants were cleaned out with water, cut into
small pieces, dried at the Animal Physiology laboratory at
22°C and then reduced into powder using THOMAS-Wiley,
LABORATORY MILL, Model 4 mill.
Preparation of the hydro-alcoholic extracts
400g of powder from each plant were extracted in 4L of an
ethanol/water mixture (50:50, V/V) for 72 hours under
intermittent manual agitation. The crude extract was filtered
on Whatman paper and evaporated in vacuum at 45°C using
a Rotavapor (Heidolph2, Germany).
The extracts were in the form of crystals and have been
stored in the refrigerator at 4°C.
Phytochemical Study of A. senegalensis and S.
longepedunculata
Phytochemical screening
The phytochemical analysis was performed for detection of
phyto-constituents present in the extracts using standard
procedure by 18.
Determination of total phenols and tannins
Total phenols were measured in the extracts by the FolinCiocalteu method and for the determination of tannins; a
second dosage of the phenols was performed after fixing
tannins by PVP (Polyvinyl pyrrolidone). Total tannins
content was determined by absorbance difference between
the first and second assay according to the method of
Maksimovic et al., 19.
Determination of total flavonoids
Flavonoids content was determined according to the method
used by Mimica-dukic 20. Briefly, to 2 ml of extract / rutin at
different concentrations (5-100 µg/ml), 2 ml of aluminum
chloride (20 mg/ml) and 6 ml of sodium acetate (50 mg/ml)
were added. Absorbance was read at 440 nm after 2.5 hours
of incubation.
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The pathogenic bacterial strains assayed in this study were
Staphylococcus aureus ATCC 29213, Escherichia coli ATCC
25922, Pseudomonas aeruginosa ATCC 27853, Klebsiella
pneumoniae ATCC 700603, including the yeast Candida
albicans ATCC 35659. These strains come from bacteriology
laboratory strain bank of the National Institute of Hygiene
(Togo).
[64]
Grown 24 hours old Microorganisms were used. To obtain
these young colonies of microorganisms, the selected germs
were isolated on Muller-Hinton agar (MHA) for bacteria and
on Sabouraud Chloramphenicol agar (SCA) for Candida
albicans. Incubation was done at 37°C for bacteria and 25°C
for Candida albicans for 18 to 24 hours.
Microbial suspensions of densities of 0.5 MC Farland diluted
10-1 were prepared in normal physiological saline with
young colonies of microorganisms.
The S. longepedunculata and A. senegalensis extracts
solutions were prepared at a concentration of 250 mg/mL in
distilled water and then sterilized on millipore membrane of
0.45 μm porosity and 47 mm in diameter 21.
Presumptive Test
It is a presumptive test that has made it possible to identify
the active extracts starting from a high concentration. The
antibiotic susceptibility testing was performed by the agar
well diffusion method with some changes 21. The high
concentration of extract in this study is 250 mg/mL.
The microbial suspensions used were equal to 0.5 Mac
Farland (≈108 CFU/mL). The inoculum was introduced on
culture medium prepared under standard conditions. These
were MHA for bacteria and SCA for Candida. The quality of
these medium was evaluated by sterility and fertility tests
before use. After inoculation of the medium, wells of 6 mm in
diameter were made using a sterile hollow punch concentric
ally in the agar. Gentamicin solution’s 30 μg/mL (for
Staphylococcus aureus, Escherichia coli, Pseudomonas
aeruginosa, Klebsiella pneumoniae) and Nystatin solution’s
250 mg/mL for Candida albicans were used as reference
drugs. For negative controls, sterile distilled water was used
in place of the extract. After 30 minutes of pre-diffusion at
laboratory temperature, the Petri dishes were incubated for
24 h at 35˚C for the bacteria and 25˚C for the yeasts. The
microbial growth inhibition zone diameter’s was measured
using an electronic reading chart. Extracts having an
inhibition diameter ≥ 12 mm (including disc) were used for
the determination of MIC and MBC/MFC. The tests were
repeated in triplicate 22.
Minimum Inhibitory Concentrations (MIC) and
Bactericidal/Fungicidal (MBC/MFC) determination
Extracts that showed a growth inhibition diameter of 12 mm
according to our presumptive test were used for the MIC and
MBC/MFC determination.
This test was performed using 96-well microplate dilution
method 23, 24, 25. From a stock extract solution of 250 mg/mL.
A successive dilutions series of the two plants extracts (250,
125, 62.5, 31.25, 15.625, 7.8125 and 3.90625 mg/mL) were
placed in Mueller Hinton Broth (MHB). The wells were
inoculated with a microbial suspension at 6x105 CFU/mL.
Quality control was performed with MHB (not inoculated).
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Another control was performed with MHB seeds to
facilitated reading. The tests were performed in a sterile
environment. The preparations were covered with parafilm
and incubated at the appropriate temperature for 24 h. After
incubation, the wells were observed with the naked eye.
Turbidity presence corresponded to microbial culture
presence. The MIC of the extract on tested strain
corresponds to extract lowest concentration for which no
culture was observed. Then, 100 μL was taken from wells
that did not show visible microbial growth to the naked eye
and plated on MHA for bacteria and SCA for Candida
albicans. Incubation was carried out at the appropriate
temperature for 24 h. The tests were performed in triplicate.
The lowest concentration for which no colonies were found
was considered the MBC or MFC of the extract on the strain
tested. The MBC/MIC ratio was used to determine the
antibiotic activity of the extract on the microbial strain.
Assessment of the in vitro anti inflammatory activity of
A. senegalensis and S. longepedunculata extracts
Membrane stabilisation assay
The method described by Javed et al., 26 and Joshi et al., 27
was used to perform this test. Wistar rats were anesthetized
using light diethyl ether and blood was collected from the
retro-orbital sinus in heparinised tubes. The collected blood
was centrifuged at 1500 rpm for 10 min and washed three
times with the same volume of normal saline. The
reconstitution of red blood cells (RBC) with saline solution
was 10% v/v suspension. To 1 mL of the RBC suspension
were added 1 mL of plant extract or the reference drug
Diclofenac sodium at different concentrations (50-1600
µg/mL) and 2 mL of hyposaline solution (0.36%). After 30
min of incubation at 37 °C, centrifugation (3000 rpm) was
performed for 20 min. The assay was performed in three
replicates for each concentration and the membrane
stabilisation percentage reflecting anti-inflammatory activity
was determined after reading the absorbance at 560 nm.
The inhibition percentage was calculated by following
formula.
Anti-inflammatory activity (%) = (A0 - At / A0) x 100
A0 was the control absorbance (without extract) and At was
the absorbance of extract or drug presence.
Inhibition of bovine protein serum albumin (BSA)
denaturation
incubation, and at 70°C during 5 min. After cooling, 2.5 mL
PBS (pH 6.3) was added to each sample. The test was
carried out in three replicates for each concentration and the
protein denaturing inhibition percentage that reflects antiinflammatory activity was determined after reading the
absorbance at 660 nm.
The inhibition percentage was calculated by following
formula.
Anti-inflammatory activity (%) = (A0 - At / A0) x 100
A0 was the control absorbance (without extract) and At was
the absorbance of extract or drug presence.
Data Analysis
Data were expressed as Mean ± SD (standard deviation) for
presumptive test and Mean ± SEM (standard error of the
Mean) for anti-inflammatory tests using the GraphPad Prism
7 software. Statistical differences between groups were
determined by ANOVA followed by Dunnett test and
considered significant for p < 0.05.
RESULTS
Phytochemical Study of A. senegalensis and S.
longepedunculata
Phytochemical screening
Phytochemical analysis of hydroalcoholic extracts A.
senegalensis and S. longepedunculata revealed the presence
of flavonoids, tannins, carbohydrates, alkaloids, phenols, and
saponosides. The results of phytochemical screening are
resumed in table 1.
Table 1 : Phytochemical screening
Metabolites
A. senegalensis
S. longepedunculata
Alkaloids
+
+
Tannins
+
+
Flavonoids
+
+
carbohydrates
+
+
Phenols
+
+
Saponosides
+
+
+ : presence
The anti-inflammatory effect of extracts was investigated
using Saleem et al., method 28. To 0.45 mL of bovine serum
albumin (BSA) solution (5% w/v), 0.05 mL of extract at
different concentration or reference drugs (Diclofenac
sodium) were added (1600; 800; 400; 200; 10 and 50
µg/ml). Incubation took place twice : at 37°C during 20 min
Determination of total flavonoids, phenols and tannins
Table 2 shows that A. senegalensis and S. longepedunculata
contain phenolic compounds.
Table 2 : Total phenols, flavonoids and tannins content
Extracts
Total flavonoids
Total phenols
Total tannins
(mgRE/g)
(mgGAE/g)
(mgGAE/g)
A. senegalensis
15.62 ± 0.71
31.77±2.24
5.15±2.24
S. longepedunculata
29.62±0.95
11.09±0.62
1.07±0.62
Total phenols and tannins are expressed in mg Gallic Acid Equivalent/g extract. Flavonoids are expressed in mg Rutin Equivalent/g extract.
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Journal of Drug Delivery & Therapeutics. 2021; 11(5-S):63-70
= 12.06 ± 0.06 mm. A. senegalensis root extract has not active
on : Klebsiella pneumonia (K. pneumonia), Escherichia coli (E.
coli) and Candida albicans (C. albicans).In addition, S.
longepedunculata extract was active on S. aureus with IZD =
12.03 ± 0.03 mm and C. albicans with IZD = 12.12 ± 0.07 mm.
S. longepedunculata root extract has not active on K.
pneumoniae, E. coli and P. aeruginosa. (Table 3)
In vitro antimicrobial property of A. senegalensis and S.
longepedunculata extracts
Antimicrobial presumptive test
The results showed that A. senegalensis extract was active on
Staphylococcus aureus (S. aureus) with IZD = 12.22 ± 0.24
mm and on Pseudomonas aeruginosa (P. aeruginosa) with IZD
Table 3 : inhibition zone diameter obtain in presumptive test
IZD (mm)
A. Senegalensis
P. aeruginosa ATCC 27853
12.06 ± 0.06
GN
S. longepedunculata
250 mg/mL
30 μg/mL
NA
14.80 ± 0.79
K. pneumonia ATCC 700603
NA
NA
11.84 ± 0.34
S. aureus ATCC 29213
12.22 ± 0.24
12.03 ± 0.03
27.30 ± 0.81
E. coli ATCC 25922
NA
NA
20.65 ± 0.06
C. albicans ATCC 35659
NA
12.12 ± 0.07
250 mg/mL
NY
250 mg/mL
29.09 ± 0.04
IZD = inhibition zone diameter, GN = Gentamicin, NY = Nystatin, NA = not active
A. senegalensis extract was active on S. aureus with MIC =
62.5 mg/mL and MBC = 125 mg/mL. He is also active on P.
aeruginosa with MIC = 125 mg/mL and MBC = 250 mg/mL.
The MBC/MIC ratio is 2 for the two bacteria on which A.
senegalensis extract was active. S. longepedunculata extract
was active on C. albicans with MIC = 62.5 mg/mL and MBC =
125 mg/mL. He is also active on S. aureus with MIC = 125
mg/mL and MBC = 250 mg/mL. The MFC/MIC or the
MBC/MIC ratio is 2 for the two bacteria on which S.
longepedunculata extract was active. (Table 4)
Determination of Minimum Inhibitory Concentrations
(MIC) and Bactericidal/Fungicidal (MBC/MFC)
MICs and MBCs/MFCs were determined for germs that were
susceptible to extra ts with inhibition diameters ≥ 12 mm.
The bacteriostatic and bactericidal effects of the extracts on
the germs were determined by the ratio of MBC/MIC or
MFC/MIC ≤ 1 (Bactericidal); MBC/MIC or MFC/MIC ≥ 2
(Bacteriostatic).
Table 4 : MIC and MBC of microorganisms
A. senegalensis
Germs
CMI (mg/ml) CMB (mg/ml)
S. longepedunculata
MBC/CMI
CMI
MBC/CMI
MFC/CMI
(mg/ml)
CMB (mg/ml)
MFC/CMI
P. aeruginosa
125
250
2
0
0
0
K. pneumonia
0
0
0
0
0
0
62.5
125
2
125
250
2
E. coli
0
0
0
0
0
0
C. albicans
0
0
0
62.5
125
2
S. aureus
Assessment of the in vitro anti inflammatory activity of A.
senegalensis and S. longepedunculata extracts
significantly (p<0.001) inhibited haemolysis compared to
diclofenac.
Membrane stabilisation assay
These results provide evidence for the membrane stabilizing
effect of both extracts as an additional mechanism for their
anti-inflammatory activity (Figure 1).
The analysis showed concentration-dependent protection of
the cell membrane by the hydroalcoholic extracts of A.
senegalensis and S. longepedunculata. For example, at the
dose of 50 µg/mL, A. senegalensis and S. longepedunculata
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Journal of Drug Delivery & Therapeutics. 2021; 11(5-S):63-70
100
d ic lo fe n a c
*
i n h ib it io n %
80
***
*
A . s e n e g a le n s is
S . lo n g e p e d u n c u la ta
60
***
***
40
*
20
00
0
16
80
0
0
40
10
20
0
*** ***
50
0
C o n c e n tra tio n (µ g /m L )
Figure 1: Effet of A. senegalensis and S. longepedunculata hydroalcoholic extracts on red blood cell membrane
stabilisation
***p
< 0,001 ; *p < 0,05 (compared to diclofenac). % inhibition = (A0 - At / A0) x 100 .A0 was the control absorbance (without extract) and At was
the absorbance of extract or drug presence.
Inhibition of bovine protein serum albumin (BSA)
denaturation
The results in figure 4 showed that At 50 µg/mL,
hydroalcoholic extracts of A. senegalensis and S.
longepedunculata significantly (p<0.05) inhibited protein
denaturation compared to Diclofenac. In addition, at the
dose of 400 µg/mL, the inhibition of BSA denaturation by the
two plants were more significant (p<0.001) than Diclofenac
(Figure 2).
150
d ic lo fe n a c
i n h ib it io n %
A . s e n e g a le n s is
S . lo n g e p e d u n c u la ta
100
*
***
***
50
***
*
00
16
0
80
0
40
0
20
10
50
0
*
0
C o n c e n tra tio n (µ g /m L )
Figure 2 : Effet of A. senegalensis and S. longepedunculata hydro-alcoholic extract on BSA denaturation
***p
< 0,001 ; *p < 0,05 (compared to diclofenac). % inhibition = (A0 - At / A0) x 100 .A0 was the control absorbance (without extract) and At was
the absorbance of extract or drug presence.
DISCUSSION
The search for natural anti-inflammatory and antimicrobial
agents with fewer side effects has crucially increased
nowadays. This study was then investigated in order to
evaluate the antiinflammatory and antimicrobial activities of
hydroalcoholic extracts of A. senegalensis and S.
longepedunculata.
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[67]
The antimicrobial assay was performed in other to detect
the sensitivity of five germs (Staphylococcus aureus ATCC
29213, Escherichia coli ATCC 25922, Pseudomonas
aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC
700603; Candida albicans ATCC 35659) in the presence of A.
senegalensis and S. longepedunculata hydro-alcoholic
extracts. Results revealed that 40% of the germs tested were
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susceptible to hydro-alcoholic extracts of A. senegalensis and
S. longepedunculata.
A. senegalensis extract was found to be active on
Staphylococcus aureus (S. aureus) and Pseudomonas
aeruginosa (P. aeruginosa) with inhibition zone diameters of
12.22 mm and 12.06 mm respectively. For the two bacteria
on which A. senegalensis extract was active, the MIC = 62.5
mg/mL for S. aureus and MIC = 125 mg/mL for P. aeruginosa.
The MBC extract for these two bacteria is 125 mg/mL for S.
aureus and 250 mg/mL for P. aeruginosa. However, this
extract was not active on E. coli, K. pneumoniae and C.
albicans Our results corroborate with the work Swhich
showed that Kaurenoic Acid isolated from A. senegalensis
root bark inhibited S. aureus and P. aeruginosa but has no
effect on Klebsiella pneumoniae and Escherichia coli 29. This
also corroborates with those of More et al., which showed
that A. senegalensis methanol extract is not active on Candida
albicans 30. Our results are different from the work of Awa et
al 31 in which methanol extract from A. senegalensis stem
bark acted on E. coli with inhibition zone diameter equals 12
mm. Lino and Deogracious 32 showed that the acqueous
extract inhibited S. aureus with a diameter of 18 mm.
Similarly, the raw flavonoids isolated from stem bark of A.
senegalensis inhibited E. coli an inhibition zone diameter
equal to 18 mm 33. The MIC and MBC obtained with
methanol and ethanol extracts of this plant are different
from the values obtained with hydro-alcoholic extract in this
study. Thus, A. senegalensis methanol extract was active on S.
aureus with MIC=250 µg/ml and MBC>1000 µg/ml 11. The
ethanol extract from A. senegalensis root bark acted on S.
aureus with a MIC=500 µg/ml 34.
In addition, S. longepedunculata extract was active on S.
aureus and C. albicans respectively with 12.03 mm and 12.12
mm inhibition diameters. For the two microbes on which A.
senegalensis extract was active, the MIC are 125 mg/mL for
S. aureus and 62.5 mg/mL for C. albicans. S. longepedunculata
extract has an MBC=250 mg/mL for S. aureus and an
MFC=125 mg/mL for C. albicans. However S.
longepedunculata is not found to be active on E. coli, P.
aeruginosa and K. pneumoniae. Our results are same with
those obtained by 35 which showed that S. longepedunculata
roots ethyl acetate fraction and n-butanol fraction have
inhibitory effects on S. aureus and C. albicans. The two
fractions had an inhibition zone diameter of 12 mm each on
both germs. Acqueous extract yielded 13 mm inhibition zone
diameter with S. aureus and MIC=1000 mg/mL 32. The lack of
sensitivity of the microorganisms used in this work to the
extracts of A. senegalensis and S. longepedunculata could be
explained by: an inaccessibility of the molecules contained in
these two extracts to the microbial cell due to the
impermeability of the membrane of the microbes to the
molecules contained in these extracts; or an affinity of the
molecules contained in these two extracts for the bacterial
target or an expulsion of the antibiotic molecules contained
in these extracts by chromosomal efflux pumps.
The diversity observed in the sensitivity of K. pneumoniae to
the extracts could be explained first by the capsule
surrounding the bacteria presence as a natural protection
[36]. Difference between our results and those obtained with
methanol and ethanol extracts is explained by the fact that
hydro-alcoholic extract (50:50) would not have been able to
extract sufficient the active ingredients extracted acting
microbe with methanol and ethanol. These active
ingredients would increase the bactericidal potency of the
two extracts when methanol and ethanol are used as
maceration solvents.
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Inflammation is a physiological process that defends body
against aggression that results in tissue alteration.
Inflammation primary function is to eliminate the aggressor
and allow tissue repair. Short-term inflammation known as
acute inflammation is a beneficial phenomenon of the body
that allows it to regain its physiological integrity. Whereas
the negative inflammation aspect occurs when it lasts and
becomes a chronic inflammation. In this case, inflammatory
reaction should be controlled by the drugs 37.
In this study, the effect of S. longepedunculata and A.
senegalensis extracts on membrane stabilization was
indexed via the ability to protect RBCs from heat-induced
haemolysis.
The red blood cell membrane stabilization can be
extrapolated to the lysosomal membrane because the two
membranes are analogous. The haemolytic effect of a
hypotonic solution is expressing by excessive accumulation
of fluid inside the cell that caused membrane rupture 38.
Results showed that S. longepedunculata and A. senegalensis
protected red blood cell membrane against haemolysis. This
effect occured in dose dependent manner. However, S.
longepedunculata showed a higher protective capacity than
the reference drug used for the 200 µg/mL dose. This could
be explained by the control of surface/volume ratio of cells
or by strengthening of the red blood cells membrane by the
plants.
Protein denaturation is a process by which proteins lose
their structure due to the presence of other compounds,
external stress, or heat, thus leading them to lose their
biological functionality. Therefore, denaturation of tissue
proteins is recognized as a marker of inflammation. In our
study, Both extracts inhibited BSA protein denaturation in
concentration depent manner. It is possible that bioactive
compounds in the extracts protect lysosomal membranes
against injury by interfering with activation of
phospholipases. The extracts may block an exagerated
release of pro-inflammatory molecules, including histamine,
serotonin, tachykinine, bradykinine and complement
proteins 39. Our results corroborate with other studies that
had demonstrated the anti-inflammatory effect of A.
senegalensis 40, 41 and S. longepedunculata42,43.
To better understand the effect of the two plants, their
preliminary phytochemical study was carried out. With
phytochemical screening, the presence of alkaloids, tannins,
flavonoids, carbohydrates, saponosides and phenols were
revealed in the two extracts. This is in accordance to the
works of 44 and 45. Quantitative tests confirmed the presence
of these phenolic compounds. The phenolic compounds
present the plants could explain their antimicrobial and antiinflammatory effects because many studies demonstrated
the antibacterial properties of tannins 46 and flavonoids 47;
anti-inflammatory properties of phenols such as coumarin
48, flavonoids 49 and tannins 50. In fact, these compounds
present in the extract having functional groups serve as
electron donors by breaking the free radical chain.
Flavonoids also have the property of stabilizing the structure
of biological membranes. Phenolic compounds also are able
to inhibit either the production or the action of proinflammatory mediators, resulting in anti-inflammatory
capacity.
CONCLUSION
In summary, A. senegalensis and S. longepedunculata have
remarquable
antimicrobial
and
anti-inflammatory
properties. These properties could be related to the
phytochemical compounds present in the hydroalcoholoic
CODEN (USA): JDDTAO
Datagni et al
Journal of Drug Delivery & Therapeutics. 2021; 11(5-S):63-70
extracts of A. senegalensis and S. longepedunculata. Taken
together, these two medicinal plants can be used in the
patients suffering of inflammation and microbial infection of
wounds by snake bites.
However, further studies are required to understand the
exact mechanism of action of various constituents present in
the two plants.
ACKNOWLEDGMENTS
The authors are grateful to the bacteriology laboratory of
National Institute of Hygiene (INH) of Lome for assistance in
antimicrobial test.
CONFLICT OF INTEREST
The authors declare that they have no conflicts of interest.
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