Some of Phytochemical, Pharmacological and Toxicological Properties of … · 2015-06-04 ·...
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Sustainable Development of Natural Resources in the Nile Basin Countries, 14 – 15 April 2014
43
Some of Phytochemical, Pharmacological and
Toxicological Properties of Henna (Lawsonia inermis
L.): A Review of Recent Researches
Nasir H. Wagini*1
, Amira Sh. Soliman2, El-Saady M. Badawy
3,
Mohamed S. Abbas1 and Yasser A. Hanafy
4
1*Biology Department, Faculty of Natural and Applied Sciences,
Umaru Musa Yar’adua University, Katsina, Nigeria,
2Natural Resources Department, Institute of African Research and
Studies, Cairo University, Egypt
3Medicinal and Ornamental Plant, Faculty of Agriculture, Cairo
University, Egypt
4Medical and Aromatic Plants Unit, Desert Research Center, Cairo,
Egypt
______________________________________________________
Abstract: Henna (Lawsonia inermis, Litheracae) is a medicinal
plant that has been widely used as herbal medicines all over the
world, since antiquity, Henna is widely used as antimicrobial and is
sometimes applied directly to the affected area for dandruff, eczema,
scabies, wounds, infectious diseases and helminthiasis. Currently,
there is a renewed interest in henna, and several scientific
investigations aimed at isolation and identification of active
constituents of henna, scientific verification of its pharmacological
actions and of its constituents, and verification of the basis of the use
of henna in some of several diseases and conditions. This article aims
at reviewing the most salient recent reports on these investigations.
The main pharmacological actions of henna and compounds isolated
therefrom include lawsone, coumarine, anti-microbial, anti-
tumorigenic, anti-inflammatory, anti-apoptotic, anti-hyperglycemic
and anti-lipidemic. Henna is a strong anti-oxidant substance and was
confirmed to mitigate or prevent generation of free radicals. It is
considered a safe herbal medicine with only few and insignificant
adverse/ side effects. Finally, more studies are required in animals
and humans on the pharmacology and toxicology of henna and its
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constituents and on the effects of their utilization over a long period
of time.
Keywords: Henna; Lawson; Anti-oxidant; Anti-tumorigenic; Anti-
inflammatory.
__________________________________________________________
1. INTRODUCTION:
Henna Lawsonia inermis L., belongs to lythraceae, also
known as the loosestrife family. Henna is cultivated by many
farmers for cosmetic and pharmaceutical purposes, it belongs to
the group of plants that are popular in nature and all parts of the
plant (root, stem, leaf, flower pod and seed) are of great
medicinal important (Abdelraouf et al. 2011). The most
important part of the plant is the leaf which contained a coloring
compound called Lawson. The Lawson is a red orange dye
molecule, also known as hennotannic acid (Gibbons et al. 2004,
Awek and Tapapul 2005, Emin and Mehmet 2012).
Although henna is traditionally drawn only on the hands and
feet, feel free to create your designs on arms, legs, around the
belly button, and even behind the neck (Tattoo 2006). Several
reviews have appeared in the literature about this plant, and this
may reflect the popularity of the subject and its common use in
cosmetic and as a medicinal plant (e.g. European 2013). Many
reviews have been devoted to specific aspects of henna’s
actions. For example, the review of Kamal & Jawaid 2010 was
on phytochemicals in henna, Chaudhary et al. 2010 and Amit et
al 2011 on phytopharmacological, while Muhammad and
Muhammad (2005) Chah et al. 2006 and Nayak et al. 2007
work on the use of henna in the wound healing, Babu and
Subhasree 2009, and Habbal et al., 2011) was on the use of
henna as antibacterial agent, however, Gupta et al. 1993 and Ali
et al. 1995 work was on the use of henna as an anti-
inflammatory agent, while that of Babili et al. (2013) and
Endrini et al. 2007) dealt with the cancer prevention properties
of the crude drug. In a nut shell, the aim was to summarize the
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more recent and common actions and therapeutic application of
henna and its active constituents.
2. Phytochemicals:
The chemical constituents of henna are numerous and vary
depending on the place of origin and whether the leaves are
fresh or dry. It is not our intention in this review to cover all the
many compounds reported for henna, but to summarize the
major components that have been implicated in the
pharmacological activities of the crude drug. Furthermore, the
dyeing property of henna depends mainly on its principal
colouring matter known as lawsone, 2- hydroxy-1:4
napthaquinone (C10H6O3, m.p.190º decomp.), the yield of which
varies from 1% to 20%. However, much work is done in the
field of phytochemical investigation of the plant. The chemical
constituents isolated from L. inermis are napthoquinone
derivatives, phenolic compounds, terpenoids, sterols, aliphatic
derisvatives, xanthones, coumarin, fatty acids, amino acids and
other constituents. However, in another research article,
phytochemical investigation of henna leaf shows total ash
(14.60 %), acid insoluble ash (4.50 %), and water soluble ash
(3.0 %). Loss on drying was found to be (4.5 % w/w). Alcohol
soluble extractive value and aqueous extractive value were 3.8
% w/w and 5.0 % w/w, respectively. The % practical yields of
alcohol and aqueous extract were found to be 12.34 % and
15.50 % (Hema et al. 2010). Meanwhile, alcoholic extract and
aqueous extract carbohydrate, glycosides, tannins, phenolic
compounds, gums and mucilage were present in good quantity
and saponins, alkaloids, phytosterols, fixed oils, fats, proteins,
amino acids, volatile oils were absent (Jain et al. 2010).
However, six compounds were identified in Lawsonia
inermis leaves by GC-MS analysis and the prevailing
compounds were a-D-Glucopyranoside, methyl (51.73%) and 1,
4-Naphthalenedione, 2-hydroxy- [Synonyms: Henna] (19.19%)
(Hema et al. 2010).
The principal colouring matter of henna is lawsone, 2-
hydroxy-1:4 napthaquinone (C10H6O3, m.p.190ºdecomp.)
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besides lawsone other constituents present are gallic acid,
glucose, mannitol, fats, resin (2 %), mucilage and traces of an
alkaloid. Leaves yield hennatannic acid and an olive oil green
resin, soluble in ether and alcohol (Pratibha and Korwar 1999).
Flowers yield an essential oil (0.01-0.02 %) with brown or dark
brown colour, strong fragrance and consist mainly of α- and β-
ionones; a nitrogenous compound and resin (Anita and Kaushal
1950). Seeds contain proteins (5.0 %), carbohydrates (33.62 %),
fibers (33.5 %), fatty oils (10- 11 %) composed of behenic acid,
arachidic acid, stearic acid, palmitic acid, oleic acid and linoleic
acid (Aggarwal et al. 1959). The unsaponified matter of henna
contains waxes and colouring matter and the root contains a red
colouring matter too (Gupta et al. 1992). Leaf, flower and fruit
extracts of L. inermis showed positive results for cardiac
glycosides test and negative results tophlobatannins and steroids
(Jeyaseelan et al., 2012). Phytochemical screening of the henna leaf
extracts showed the presence of glycosides, phytosterol, steroids, saponins,
tannins and flavonoids (Raja et al., 2013).
3. Pharmacological properties of L. inermis:
Several researchers have reported the different antibacterial
actions of L. inermis in various in-vitro and in-vivo test models.
Henna leaves, flower, seeds, stem bark, roots have been found
to exhibit antioxidant, antidiabetic, hepatoprotective,
hypoglycemic, antimicrobial, anticancer and wound healing
properties.
3.1. Antibacterial studies of henna:
Ethanol extracts of 20 plants species used by Yemeni
traditional healers to treat infectious diseases were screened for
their antibacterial activity against both gram positive and gram
negative bacteria. The ethyl acetate extract of L. inermis was
found to be the most active against all the bacteria in the test
system (Ali et al. 2001, Nadjib et al. 2013 and Abulyazid et al.
2013). Out of forty-five species of 29 plant families used in the
traditional medicine by Iranian people showed antibacterial
activities against eleven bacterial species, henna showed strong
activity against Bordetella bronchiseptica. These findings
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indicated that L. inermis can be used in the treatment of
bacterial infections (Bonjar 2004). Crude extracts of fresh dry
leaves and seeds of henna were investigated for their
antimicrobial activity against three standard strains. Henna dry
leaves demonstrated the best in-vitro antimicrobial activity and
in particular against Shigella sonnei (Habbal et al. 2005).
Genotoxic studies on main constituent of henna suggested that it
was a weak bacterial mutagen for Salmonella typhimurium
strain TA98 and was more mutagenic for strain TA2637. It
suggested that hydroxyl napthaquinone have no genotoxic risk
to the consumer (Kirkland and Marzin 2003). Primary invaders
of burn wounds viz Staphylococcus aureus, Pseudomonas
aeruginosa, Candida albicans, Fusarium oxysporum and
Aspergillus niger were treated with aqueous and chloroform
extract obtained from leaves of L. inermis, using in-vitro agar
incorporation and well diffusion methods. Extract inhibit
growth pattern of all microbes except C. albicans. Overall,
study by Muhammad and Muhammad (2005) suggested that
henna may be effective in the management of wound infections.
The antibacterial activity of methanolic extract of L. inermis
was investigated by agar well diffusion method using S. aureus
(MTCC 087), E. coli (MTCC 729), K. pneumonia (MTCC 432),
P. aeruginosa (MTCC 1688) and P. mirablis (MTCC 425) by
Arun et al. (2010). Antibacterial activity of aqueous, ethanol,
methanol, ethyl acetate and chloroform extracts of Lawsonia
inermis Linn leaves were tested against reference bacterial
strains (Escherichia coli, Klebsiella pneumoniae, Pseudomonas
aeuroginosa, Proteus mirabilis, Salmonella typhi, Vibrio
cholerae, Staphylococcus aureus, Methicillin Resistant
Staphylococcus aureus) and clinical isolates (Staphylococcus
aureus and AmpC β-lactamases producing Proteus mirabilis).
The solvent extracts of L. inermis leaves exhibited profound
antibacterial activity against the bacterial pathogens tested
(Ramesh et al., 2013). Henna samples from different regions of
Oman demonstrated antibacterial activity against a wide range
of different bacterial strains with the highest antibacterial
activity being demonstrated against P. aeruginosa organisms
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(Habbal et al., 2011). Henna leaves extracts showed
considerable antimicrobial activity almost on all of the tested
microorganisms (S. aureus, Bacillus spp., K. pneumonia,
Proteus spp., E. coli, P. aeruginosa, and Enterococcus spp.with
the exception of aqueous extract which showed the least effect
on most bacterial samples tested (Abdelraouf et al., 2011). In-
vitro antibacterial activities of the aqueous extract, fractions of
ethanol extract and fractionation residue of the leaves were
investigated against Staphylococcus aureus, Proteus vulgaris,
Streptococcus pneumoniae, Pseudomonas aeruginosa,
Escherichia coli, Klebsiella pneumoniae, Streptococcus
pyogenes, Salmonella typhi and Shigella dysenteriae using agar-
disc diffusion method. The aqueous extract, the fractions and
the fractionation residues all showed antibacterial activities
against the test isolates (Kawo and Kwa 2011).
3.2. Antifungal studies of henna:
Mansour et al. (2012) and Abulyazid et al. (2013) reported in
their research that L. inermis leaves extract have developed a
fungicidal effect against Trichophyton mentagrophytes and
Candida albicans. Among the fifty two plants screened,
aqueous extract of Lawsonia inermis and 10 other plant species
have recorded significant antifungal activity against one or the
other Aspergillus species tested (Raveesha et al. 2007).
Sharma et al. (2011) reported that the sensitivity of
dermatophytes toward henna was strong in Trichophyton
mentagrophytes, T. rubrum, T. tonsurans, T. violaceum, T.
verrocosum, T. schoenleinii, Epidermophyton floccosum,
Microsporum ferrugineum, M. canis and sporotrichum
schenckii. Meanwhile, ethanol, methanol and aqueous extract of
leaves of L. inermis are involved in defensive mechanism
against spore germination of Drechslera oryzae (Natarajan and
Lalitha 1987). During screening of barks of 30 plant species for
activity against Microsporum gypseum and Trichophyton
mentagrophytes, only L. inermis extract exhibited absolute
toxicity. The extract showed broad fungitoxic spectrum when
tested against 13 other dermatophytes. Further the fungitoxicity
of the extract remained unaltered at high temperature on
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autoclaving and after long storage (Singh and Pandey 1989).
Aqueous extract of leaves of L. inermis was tested for the
antifungal potential against eight important species of
Aspergillus which isolated from sorghum, maize and paddy seed
samples. A. flavus recorded high susceptibility and hence
solvent extracts viz., petroleum ether, benzene, chloroform,
methanol and ethanol extract of the plant showed significant
antifungal activity (Raveesha et al. 2007). These finding
suggested that henna extract could be used as alternative source
of antifungal agents for protection of plants or crops against
fungal infection.
In another research by Natarajan and Lalitha (1987), the
activity of ethanol, ethyl acetate and hexane extracts of L.
inermis were tested on 5 strains each of Tinea rubrum and Tinea
mentagrophytes. All these extracts showed significant
antidermatophytic properties in-vitro. The effect of aqueous and
methanolic extract of henna using 25 μl of the extracts against
C. albicans and Microsporum was examined and confirmed
(Abdelraouf et al., 2011).
3.3. Antiviral studies of henna:
Henna definitely has an anti-viral effect that became clear by
its action on warts, whitlow and herpes simplex. Henna was
tried traditionally in many times especially on the warts which
are resistant to cryo (Nitrogen liquid) treatment and prove
effective on giant wart measuring 1.5x1.5cm on a child thumb
which was resistant to all forms of treatment, at last the child
referred to the plastic surgeon for operation, “we tried Henna on
it, applied every other day over night and in few weeks it
disappeared completely”. Henna was found very useful
especially on multiple wars. On warts Henna applied as paste.
The second proven and successful effect of henna on viral
infections was after its application to herpes it was noticed that;
it dried the vesicles at the site early, prevent ulceration and crust
formation and it prevents secondary infection. This anti-viral
effect of Henna is very promising and should be explored
further; it could be used as treatment for AIDS. It is natural,
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cheap, and it looks to have no side effect even when taken by
oral route (Hussain 2010).
The ethanol soluble fraction of L. inermis fruits displayed
highly potent activity against Sembiki forest virus (SFV) in
swiss mice and chick embryo models exhibiting 100 to 65 %
activities after 10 to 25 days of virus challenge (Khan et al.
1991).
3.4. Abortifacient activity of henna:
Methanol extract of roots of L. inermis was most effective in
inducing abortion in mice, rats and guinea pig. The effect
apparently was dosage dependent. The results of the whole
animal experiments support the methanol extract effectiveness
as an abortant due to its maternal and foetal toxic effects
(Chaudhary et al. 2010). However, the results of Bello et al.,
(2010) support and confirm the use of Lawsonia inermis to
induce first trimester abortions, prevent and treat postpartum
haemorrhage in traditional medicine and suggest that uterotonic
activity involving the beta-adrenergic pathway may be the
mechanism.
3.5. Antioxidant activity of henna:
2-hydroxy-1,4-naphthoquinone (HNQ; Lawsone, CAS 83-
72-7) is the main dye ingredient found in the natural plant of
Henna (Lawsonia inermis). The percentages of superoxide
anion (O2.) and hydrogen peroxide (H2O2,) formation during the
oxidation of 100 μM phenanthridine by guinea pig aldehyde
oxidase have been measured and found to be 6-10% and 85-
90%, respectively (Omar 2005). The modulator effect of 80 %
ethanol extract of leaves of L. inermis was studied on drug
metabolizing phase-I and phase-II enzymes, antioxidant
enzymes, glutathione content, lactate dehydrogenase and lipid
peroxidation in the liver of swiss albino mice. The hepatic
glutathione S-transferase and DT-diaphorase specific activities
were elevated above basal level by L. inermis extract treatment
(Dasgupta et al. 2003). Another study was carried out to assess
the effect of aqueous and methanolic extracts of L. inermis
extract on chromium (VI)–induced cellular and DNA toxicity.
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The extracts showed significant potential in scavenging free
radicals of 1,1-Diphenyl-2-picrylhydrazyl (DPPH), 3-
ethylbenzothiazoline-6-sulfonic acid (ABTS), Fe3+ and also in
inhibition of lipid peroxidation. Extracts also showed
significantly properties of DNA and cyto-protection (Guha et al.
2011). Different constituents isolated from the leaves of L.
inermis were tested for their antioxidant activity using ABTS.
The IC50 value of henna constituents are p-coumaric acid (2.6
mM), cosmosiin (2.9 mM) apiin (1.6 mM) respectively. These
fundings depicted that all isolated compounds exhibited
antioxidant activity comparable to that of ascorbic acid (2.5
mM) (Mikhaeil et al. 2004).
3.6. Hepato-protective activity of henna:
The aqueous extract of Lawsonia inermis was administered
orally to the rats with hepatotoxicity induced by paracetamol.
Silymarin was given as reference standard. The plant aqueous
extract was effective in protecting the liver against the injury
induced by Paracetamol in rats. This was evident from
significant reduction in serum enzymes alkaline
aminotransferase (ALT), aspartate aminotransferase (AST),
alkaline phosphatase (ALP), Acid Phosphatase (ACP), Protein
and Bilirubin (Selvanayaki and Ananthi 2012). Alcoholic
extract of the bark of L. inermis showed hepatoprotective effect
against the CCl4. Extract cause elevation in serum marker
enzymes (GOT and GPT), serum bilirubin, liver lipid
peroxidation and reduction in total serum protein, liver
glutathione, glutathione peroxidase, glutathione-s-transferase,
glycogen, superoxide dismutase and catalase activity (Anand et
al. 1992 and Bhandarkar 2003). The hepatoprotective activity of
the ethanolic extract of the dried leaves of L. inermis and its
fractions (petroleum ether, ethyl acetate, butanol and butanone
fractions) was evaluated against CCl4 induced hepatotoxicity in
mice. The ethanolic extract and its fractions significantly
reduced the total bilirubin content and aspartate
aminotransferase or serum glutamic oxaloacetic transaminase
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Serum Glutamic Oxaloacetic Transaminase (SGOT), Serum
Glutamic Oxaloacetic Transaminase (SGPT) and Serum
Alkaline (SAL) activities, and reduced liver weight compared to
Liver Care (LIV-52) used as control (Hemalatha et al. 1997).
The ABTS [2,2-azino-bis (3-ethyl benzthiazoline-6-sulfonic
acid)], free radical scavenging assay depicted that all isolated
compounds from henna exhibited antioxidant activity in an in
vitro study comparable to that of ascorbic acid (Botros et al.,
2004).
3.7. Antidiabetic activity of henna:
Ethanol (70 %) extract of L. inermis showed significant
hypoglycemic and hypolipidemic activities in alloxan induced
diabetic mice after oral administration. The feeding of 0.8 g/kg
of L. inermis extract decreased the concentration of glucose,
cholesterol and triglycerides to normal (Syamsudin and
Winarno 2008).
3.8. Protein glycation inhibitory activity of henna:
Ethanol extract of the plant tissues was evaluated in-vitro for
protein glycation inhibitory activity using the model system of
bovine serum albumin and glucose (Monique et al. 2005). The
extract and its components showed significant effect on protein
damage induced by a free radical generator during in-vitro assay
system. It was found by Sultana et al. (2009) that the alcoholic
extract, lawsone and gallic acid showed significant inhibition of
Advanced Glycated End Products (AGEs) formation and exhibit
77.95 %, 79.10 % and 66.98 % inhibition at a concentration of
1500 μg/mL, 1000 μg/mL and 1000 μM respectively. L. inermis
constituents were confirmed to be glycation inhibitors.
3.9. Wound healing activity of henna:
Ethanol extract of the plant (200 mg/kg) was used to
evaluate the wound healing activity on rats using excision,
incision and dead space wound models. Topical application was
made in the case of excision wound model. Whereas, oral
treatment was done with incision and dead space wound model.
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Extract of L. inermis showed high rate of wound contraction, a
decrease in the period of epithelialization, high skin breaking
strength, a significant increase in the granulation tissue weight
and hydroxyproline content (Hamdi et al. 1997). Histological
studies of the tissue showed increased well organized bands of
collagen, more fibroblasts and few inflammatory cells when
compared with the controls which showed inflammatory cells,
scanty collagen fibres and fibroblasts. These findings suggested
the use of L. inermis in the management of wound healing
(Nayak et al. 2007). Chloroform and aqueous extracts of leaves
of the plant were capable of inhibiting the growth of
microorganisms that are involved in causing burn wound
infections (Muhammad and Muhammad 2005).
3.10. Anti-inflammatory activity of henna:
Isoplumbagin and lawsaritol, isolated from stem bark and
root of L. inermis screened for anti-inflammatory activity
against carrageenan induced paw edema in rats. The results
showed that isoplumbagin exhibited significant activity, was
compared to that of phenylbutazone (Gupta et al. 1993).
Butanol and chloroform fractions showed potent anti-
inflammatory, analgesic and antipyretic effects that aqueous
fraction of crude ethanol extract of L. inermis in a dose
dependent manner (Ali et al. 1995).
3.11. Tuberculostatic activityof henna:
The tuberculostatic activity of henna was tested in-vitro and
in-vivo using Lowenstein Jensen medium, the growth of
Tubercle bacilli from sputum of Mycobacterium tuberculosis
was inhibited by 6μg/ml of the herb. In-vivo studies on guinea
pigs and mice showed that the plant at a dose of 5 mg/kg body
weight led to a significant resolution of experimental
tuberculosis following infection with M. tuberculosis (Sharma
1990).
3.12. Anticancer activity:
The anticarcinogenic activity of chloroform extract L. inermis
leaves was carried using microculture tetrazolium salt assay on
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the human breast (MCF-7), colon (Caco-2), liver (HepG2)
carcinoma cell lines and normal human liver cell lines (Chang
Liver). The preliminary results showed that the henna extract
displayed the cytotoxic effects against HepG2 and MCF-7 and
IC-value of 0.3 and 24.85µg/ml respectively (Endrini et al.
2007). Isoplumbagin at a concentration of 10.5–10.8 M, the
compound typically produced LC50 – level responses against a
majority of the melanoma and colon cancer cell lines as well as
against several of the non-small cell lungs, colon, Central
Nervous System (CNS), and renal cell lines. Isoplumbagin
showed an interesting profile of cytotoxic activity (Ali and
Grever 1998).
The antitumour activity of L. inermis leaf extract was studied
on 7,12-dimethylbenzanthracene (DMBA) induced 2-stage skin
carcinogenesis and B16F10 melanoma tumour model using
swiss albino mice. Topical application of L. inermis leaf extract
at a dose level of 1000 mg/kg body weight was found to be
effective in reducing the number of the papillomas (Wasim et
al. 2009).
3.13. Molluscidal activity:
The molluscicidal activity of leaf, bark and seed of henna
against Lymnaea acuminata and Indoplanorbis exustus were
studied. Seed powder was more toxic than leaf and bark against
L. exustus (Ahmed et al. 2000). Binary combinations of henna
seed with Cedrus deodara Roxh and Azadirachta indica A Juss
oil, or powdered Allium sativum, or Zingiber officinale rhizome
oleoresin was more toxic to snails L. acuminata and I. exustus
than their single treatment. The highest increase in the toxicity
was observed when henna seeds powder and C. deodara oil
(1:1) were tested against both the snails. The combination with
neem oil was also more toxic than their individual components
and other combinations (Singh and Singh 2001).
3.14. Antitrypanasomal activity of henna:
Crude methanolic extract of leaf of L. inermis showed in-
vitro activity against Trypanosoma brucei at concentration of
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8.3 mg/ml of blood in mice but not in-vivo. The treatment tends
to ameliorate the disease condition, but did not affect the level
of parasitaemia and packed cell volume (Wurochekke et al.
2004).
3.15. Antifertility activity of henna:
Ethanol extract prepared from the powdered seeds of L.
inermis failed to show significant antifertility activity. However
in subsequent studies it was observed that the powdered leaves
of henna, when administered as suspension or incorporated into
the diet inhibited the fertility of rats. The fertility induced
appeared was found to be permanent (Munshi et al. 1977).
3.16. Immunomodulatory activity of henna:
Methanol extract of henna leaves at 1 mg/ml concentration
had displayed immunostimulant action as indicated by
promotion of T-lymphocyte proliferative responses. Seven
compounds were isolated adopting the lymphocyte
transformation assay (LTA)-guided fractionation of the total
methanolic extract of henna leaves (Mikhaeil et al.
2004). Naphthoquinone fraction obtained from leaves L.
inermis showed significant immunomodulatory effect (Dikshit
et al. 2000).
3.17. Nootropic activity of henna:
The effect of acetone soluble fraction of petroleum ether
extract of L. inermis leaves was investigated on memory,
anxiety and behaviour mediated via monoamine
neurotransmitters using elevated plus maze and passive shock
avoidance paradigms. The extract exhibited prominent
nootropic activity, potentiated clonidine induced hypothermia
and decreased lithium induced head twitches. However, the
haloperidol induced catalepsy was not modified (Iyer et al.
1998).
4. Toxicology/Safety evaluation:
Henna is widely used as antimicrobial and is sometimes
applied directly to the affected area for dandruff, eczema,
scabies, infections, and wounds (Mansour et al. 2013). While in
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manufacturing, henna is used in cosmetics, hair dyes, and hair
care products; and as a dye for body, nails, hands, and clothing.
However, Catherine (2008) reported that the use of henna is
widespread and has been used for centuries as generally
considered harmless since prehistoric time to date. Opinion of
The European Commission (EC) (2013) during the meeting of
the Scientific Committee on Cosmetic Products and Non-Food
Products (SCCNFP) intended for consumers concerning
Lawsonia Inermis (henna) concluded that Lawsonia inermis is
not irritant for the rabbit skin and eye and was considered not
irritating on human skin after Repeated Insult-Patch Tests
(RIPT). However, Nadjib et al. (2013) reported that most of the
toxicological studies published in medical journals concerning
the toxic effects, due to the use of herbal medicine, are
associated with hepatotoxicity, mutagenecity and
carcinogenicity. As such, numerous advance biological
experimental techniques are needed to be used as standard
safety test prior to the efficacy study. From the literature it has
been noted that L. inermis L. exhibited significant
hepatoprotective, antioxidant, antiinflammatory, antimicrobial,
analgesic and adaptogenic effects, indicating that it is a safe
substance to be used as a drug ordinarily (Chaudhary et al.
2010, Mansour et al. 2013 and Shahitha et al. 2013). Reports
show that methanolic root extracts of Lawsonia is used in
Nigeria for cosmetic purposes and antimalarial (Idowu et al.
2010). Users’ accounts few negative effects of natural henna
paste, such as occasional allergic reactions in people with
glucose 6 phosphate (G6PD) deficiency. Pre-mixed henna body
art pastes may have ingredients added to darken stain, or to alter
stain color. The health risks involved in pre-mixed paste not the
natural henna, therefore consumers are advice to avoid henna
with synthetic additives (Raupp et al. 2001 and Dron et al.
2007).Otherwise; some pastes have been noted to contained
synthetic: silver nitrate, carmine, pyrogallol, disperse orange
dye, and chromium. These have been found to cause allergic
reactions, chronic inflammatory reactions, or late-onset allergic
reactions to hairdressing products and textile dyes (Kang and
Sustainable Development of Natural Resources in the Nile Basin Countries, 14 – 15 April 2014
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Lee 2006). In this case one has to be careful while buying henna
from market.
5. Conclusion:
Medical plants such as henna are commonly used by local
inhabitants for their antimicrobial activity. Use of a simple to
complex methods for extraction and analysis of L. inermis has
proven to be successful in the estimation and confirmation of
phytochemicals and antimicrobial activity against large number
of bacteria and fungi which are responsible for various
infections. The data confirmed the effective role of L. inermis to
cause high disturbances of protein, amylase and glycoprotein
fractions of the microorganisms tested and a high effect of L.
inermis on microbial growth at both higher and lower
concentrations. Henna has a wide spectrum of antimicrobial
pathogens activity including antibacterial, antiviral, antimycotic
and antiparasitic activities. With the ever increasing resistant
strains of microorganisms to the already available and
synthesized antibiotics, the naturally available Lawsonia inermis
(henna) could be a potential alternative.
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