Chemical Constituent - Main
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22.1 Introduction
The use of plants for the treatment of various human ailments is not new and known
for the past several centuries. Herbal formulations were used by early human days to
the modern era for the remedy against many forms of diseases. Plants have been rec-
ognized as a curative agent since from many ancient civilizations such as Indians,
Chinese, Egyptians, Romans, and Greeks (Gaidahani et al. 2009; Kumara et al. 2012;
Mohanty et al. 2017). Plant products in the form of extracts or dry powder are chiefly
employed in Ayurveda, Chinese medicine, homeopathy, naturopathy, Native American,
Siddha, Tibetan, and Unani medicines (Erok 2013; Mohanty et al. 2015; Atanasov
et al. 2015; Swamy et al. 2015; Arumugam et al. 2016). According to the assessment
report of the World Health Organization (WHO), around 80% of the global population
mainly rely upon herb-based medicines to meet their basic health-care needs
H. Ahmed
Department of Biological sciences, Usmanu Danfodiyo University Sokoto, Sokoto, Nigeria
Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia,
Serdang, Selangor, Malaysia
A. S. Juraimi (*) · M. K. Swamy (*) · M. S. Ahmad-Hamdani · U. R. Sinniah (*)
Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia,
Serdang, Selangor, Malaysia
e-mail: dean.agri@upm.edu.my; umarani@upm.edu.my
D. Omar
Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia,
Serdang, Selangor, Malaysia
M. Y. Rafii
Institute of Tropical Agriculture, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
M. S. Akhtar
Department of Botany, Gandhi Faiz-e-Aam College, Shahjahanpur, Uttar Pradesh, India
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518 H. Ahmed et al.
(Kumara Swamy et al. 2011, 2015; Kumara et al. 2012; Swamy and Sinniah 2015;
Arumugam et al. 2016; Mohanty et al. 2017). Moreover, currently available modern
therapeutic drugs are discovered primarily from the knowledge on herbs from the
traditional practices of treatments. Today’s drug discovery is largely focused on utiliz-
ing natural resources and their compounds to combat the danger of persistently grow-
ing human illnesses (Mohanty et al. 2014; Arumugam et al. 2016; Swamy et al. 2016,
2017). Many pharmaceutical industries often rely on plants as a source of essential
ingredient and raw material (Swamy and Sinniah 2016; Arumugam et al. 2016; Tariq
et al. 2017). Hence, to meet the growing demand for herbal raw materials, several
medicinal and aromatic plants have been cultivated commercially for obtaining bioac-
tive metabolites (Sudipta et al. 2011; Swamy and Sinniah 2016; Mohanty et al. 2017).
The genus Sida belonging to the family Malvaceae includes over 200 herbaceous
species with ethnomedicinal significance (Sivarajan and Pradeep 1996; Dinda et al.
2015). These plants are distributed pantropically throughout the world. Sida cordi-
folia, also well known as “Malva Branca” is utilized in Brazilian folk medicines for
treating inflammatory diseases, blennorrhea, asthma, nasal congestion, and stomati-
tis (Franzotti et al. 2000; Franco et al. 2005; Dinda et al. 2015). In many parts of the
African countries, it is used against several health problems, especially for treating
respiratory diseases (Galal et al. 2015; Dinda et al. 2015). The plant possesses anti-
inflammatory (Kanth and Diwan 1999), hypoglycemic, analgesic (Dinda et al.
2015; Siddiqui et al. 2016), anti-protozoan (Khare 2004), antiulcer (Philip et al.
2008; Akilandeswari et al. 2013), antimicrobial (Masih et al. 2014; Halilu et al.
2016), antihelminthic (Pawa et al. 2011; Nathaniel et al. 2014), and anticancer
(Dassonneville et al. 2000; Mallikarjuna et al. 2013; Srinithya et al. 2016) proper-
ties. The presence of the constituent, ephedrine, imparts psychostimulative proper-
ties to the plant and affects the heart and central nervous system. Also, ephedrine
acts as a bronchodilator and decongestant (Santos et al. 2005; Galal et al. 2015;
Adam and Steven 2006). In India, the root of S. cordifolia is popularly recognized
by the name Bala and used widely as an ingredient for preparing various formula-
tions of Ayurvedic medicines. The remedial properties of S. cordifolia are because
of the presence of various bioactive phytoconstituents such as 2-carboxylated try-
tamines, β-phenylamines, quinoline, quinazoline, indole, ephedrine, vasicinone,
5-hydroxy-3-isoprenyl flavone, 5, 7-dihydroxy-3-isoprenyl flavone, 6-(Isoprenyl)-
3-methoxy-8-C-β-D-glucosyl-kaempferol 3-O-β-D-glucosyl [1–4]-α-D-glucoside,
and many others (Ghosal et al. 1975; Prakash et al. 1981; Sutradhar et al. 2007b,
2008; Chaves et al. 2013).
In recent years, cancer disease has been widely spread across the world, and its
incidences are increasing constantly. In 2016, American Cancer Society estimated
about 1,685,210 number of new cancer cases worldwide. In Asian countries (consti-
tutes 60% total global population) one-third of deaths were related to cancer, and
the death rate was projected to geometrically increase to 16 million in 2025 (Shin
et al. 2012; Ferlay et al. 2010). According to World Cancer Research Foundation,
Denmark has the highest cancer rate among the nations, while Nigeria has the low-
est rate in 2012 (Ferlay et al. 2010). Cancer cells develop rapidly and progressively
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22 Botany, Chemistry, and Pharmaceutical Significance of Sida cordifolia… 519
invade normal body tissues in a stepwise manner, hence making its early detection
and prevention difficult. The cause for cancer includes chemicals, radiations, inges-
tion of carcinogens, immune failure, and pathogenic and genetic factors (Chacko
et al. 2015).
For decades, traditional herbal medicine has played a vital role in the develop-
ment of anticancer drugs with minimum side effects worldwide (Nath et al. 2013).
Exploration of botanical natural products for cancer prevention has resulted in the
development of more than 300 anticancer drugs (Abdel-Kadir et al. 2007). Though
herbal medicine is natural and safe, it can be detrimental or toxic to humans when
taken in specific conditions such as pregnancy, lactation, ulcer, and hepatic prob-
lems or at high doses. For instance, root bark extract of Annona senegalensis exhib-
ited 50% cellular toxicity against HeLa, PANC-1, and 293-T cells at 211.35, 166.07,
and 125.89 μg/ml (Okoye et al. 2011). In contrast, some active compounds includ-
ing piperine from Piper nigrum, Cicer arietinum, and Plantago major at 5000 mg/
kg, 600 μg/ml, and 2000 mg/kg were reported to be nontoxic on mammary tumori-
genesis and peripheral blood mononuclear cells and nonmortal (Garcia et al. 2003;
Damanhouri and Ahmad 2014; Kumar et al. 2014). Interestingly, pharmacological
study ascertained negligible or low-toxicity effect of S. cordifolia extract when
administered orally on mice and exhibited good anti-inflammatory and analgesic
activity (Franzotti et al. 2000; Konaté et al. 2012; Quedraogo et al. 2012). The weak
toxicity level of S. cordifolia to biological system gives an interesting feature and
suggests its potential safety for therapeutic applications. Thus considering the above
facts, the present chapter aims to provide detailed information about the ethnobo-
tanical, phytochemical, and pharmacological aspects of S. cordifolia. The informa-
tion will be useful for the development of novel drugs against various deadly
diseases including cancer.
S. cordifolia is an erect perennial herb that grows up to 1.5 m height. It can tolerate
drought as well as high rainfall conditions and strive in a wide variety of soil types.
Leaves are simple heart truncate and serrate shaped with 2.5–7 cm long and
2.5–5 cm broad, ovate with entire leaf blade, and dense stellate hairs (Jain et al.
2011). Stems are ascending, stout and strong, and tall with densely stellate pubes-
cent. A well-developed tap root system is up to 60 cm. Peduncle bears yellow flow-
ers produced in clusters jointly above the panicle, flowers bisexual are paired or
solitary, small axillaries or subterminal with cup-shaped calyx and yellow corolla,
mericarps with awns (Dinda et al. 2015). Fruits are slender mericarp, 5-carpeled,
6–8 mm diameter across and sub-discoid with each carpel having two long linear
and setaceous awns; seeds are flattened, grayish black, smooth, and produced in
capsules divided into ten segments (Khurana et al. 2016).
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520 H. Ahmed et al.
22.2.2 Taxonomy
Sida cordifolia is a flowering plant belongs to the Malvaceae family. The order
Malvales taxa consisting of four families (Bombacaceae, Malvaceae, Sterculiaceae,
and Tiliaceae) comprises about 250 genera and 4230 species which are widely
spread across the world (Tate et al. 2005). Chromosomal evolution of the family has
been dynamic with haploid numbers ranging from n = 5 to 36; generic alliance of
Sida contains 11 genera (Akrosida, Allosidastrum, Dendrosida, Krapovickasia,
Malvella, Maximalva, Rhynchsida, Sida, Sidasodes, Sidastrum, and Tetrasidas)
which are characterized by morphology and basic chromosome numbers of pollen
and fruits with a varying haploid chromosome numbers from n = 6 to 28 (Tate et al.
2005; Carolina et al. 2010). Common names includes country mallow, flannel weed,
heart leaf shape Sida, Brazil “Malva Branca,” Malaysia “Pokok kelulut puteh,”
Chinese “Ke dong,” Nigeria (Hausa) “Garmani,” Hindi “Kungyi,” Sanskrit “Bala,”
Tamil “Mayir-manikham,” Bengali “Brela,” and Punjab “Simak.”
An ethnobotanical investigation has shown that many species of the genus Sida are
traditionally used to treat various kinds of diseases. Among such plants, S. cordifo-
lia L. and S. acuta Burn f. contribute to the modern system of herbal medicine and
drug development (Jain et al. 2011). In India, S. cordifolia has been used widely
since historic periods as one of the important raw material for preparing various
Ayurvedic medicines (Galal et al. 2015). Some of the ethnobotanical importance of
different parts of S. cordifolia and their preparations are detailed in Table 22.1. Its
medicinal significance includes the treatment of illnesses such as bronchial asthma,
nasal congestion, headache, aching joints and bones, edema, cough, gastrointestinal
and urinary infections, debility, skin ailments, weight loss, asthma, rheumatism,
stomatitis, stomach upset, diarrhea, dysentery, premature ejaculation, miscarriage,
malaria, fever, bronchitis, variola, and sciatica; its use in childbirth; and anti-gonor-
rhea, antituberculosis, anti-obesity, anticancer, antibacterial, anti-ulcer, antipyretic,
diuretic, aphrodisiac, and hepatoprotective properties (Sutradhar et al. 2007a;
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Table 22.1 Ethnobotanical importance S. cordifolia uses and its mode of preparation against
difference ailments
Plant Mode of
part used Ethnomedicinal use Country preparation References
Root Rheumatism and sciatica India Decoction of fresh Vasudevan Nair
root bark (2004)
Hemiplegia, Parkinson’s India – Divakar et al.
disease, weight loss, (2013)
weakness, mental
exhaustion
Facial paralysis India – Khatoon et al.
(2005) and
Nagashayana et al.
(2000)
Sunstroke India Paste of root with Kapoor and
sugar orally Lakhera (2013)
Leucorrhoea India Powdered root bark Kapoor and
mixed with milk Lakhera (2013)
and sugar orally
Jaundice India Mixture of half cup Sarkar and Das
root juice and half (2010)
tablespoon sugar
candy is given once
daily till cured
Eye inflammation Burkina Faso Maceration Brink and
and Tanzania Achigan-Dako
(2012)
Abortion Kenya and Extract orally Brink and
Central African Achigan-Dako
Republic (2012)
Urinary tract problem Bangladesh – Brink and
and fever, dysentery and Benin Achigan-Dako
(2012) and
Rahmatullah et al
(2010)
Menstruation Kenya and Chewing Brink and
Central African Achigan-Dako
Republic (2012)
Leaf and Hair loss, constipation, Colombia Decoction Ballesteros et al.
twig and fever (2013)
Leaf Cuts India Pounded leaves Kapoor and
Lakhera (2013)
Syphilis and pneumonia Rwanda Leaves Boily and
Puyvelde (1986)
Ophthalmic diseases India Paste of leaves Ajithabai et al.
externally (2012)
Fever; prevent Burkina Faso Decoction Nacoulma (1996)
miscarriage
Dysentery, sprains, Burkina Faso, Poultice to sprains Brink and
swellings, and intestinal Kenya, and swelling, Achigan-Dako
worms Philippines, decoction orally for (2012)
Burundi, control of intestinal
Senegal worms
(continued)
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22 Botany, Chemistry, and Pharmaceutical Significance of Sida cordifolia… 523
Nagashayana et al. 2000; Jain et al. 2011; Srivastava et al. 2013; Dinda et al. 2015;
Halilu et al. 2016). Seeds are commonly considered to be aphrodisiac, while the
juice of the whole plant is useful in preventing premature ejaculation (Konaté et al.
2012), controlling neurodegenerative (Alzheimer’s, Parkinson’s) diseases, loss of
memory, degeneration of nerves, and other neurological disorders (Auddy et al.
2003). Traditionally its root extract is used to promote wound healing, crumpled
leaves serve as an astringent dressing of wounds and treatment of skin injuries,
stomach problems, nervous system, muscular pain and as a cardiac tonic (Pawar
et al. 2016), analgesic, depressive effect on central nervous system, cancer treatment
and anti-inflammatory and regeneration of liver cells (Franco et al. 2005; Jenny
et al. 2005; Nunes et al. 2006). In Brazil, S. cordifolia is used in their folk medicines
for treating inflammatory diseases, blennorrhea, asthma, nasal congestion, and sto-
matitis (Franzotti et al. 2000; Franco et al. 2005; Dinda et al. 2015). In many parts
of the African countries, it is used against several health problems, especially for
treating respiratory diseases (Galal et al. 2015; Dinda et al. 2015). Methanol extract
of S. cordifolia at 6–8 μg/ml was observed to have cytotoxic effect on HeLa cell line
and was also effective against phytopathogens such as Bacillus subtilis, Escherichia
coli, Enterobacter aerogenes, Mycobacterium spp., Pseudomonas aeruginosa, and
Micrococcus spp. (Joseph et al. 2011). Seeds are useful for vowel complaints; roots
possess tonic, astringent, and diuretic properties, hemiplegia, urinary disorder, and
facial paralysis (Kanth and Diwan 1999). In China, it is used as an equivalent to
ephedra, an herbal preparation from the plant Ephedra sinica, while it is employed
against dental problems in Kenya (Galal et al. 2015).
22.4 Phytochemistry
22.4.1 Alkaloids
The aerial parts of S. cordifolia are reported to contain ephedrine and Ψ-ephedrine
and appreciable quantities of water soluble alkaloids (Dutta and Crane 1963). The
total alkaloid content is reported to be 0.085%. Reverse-phase high-performance
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22.4.2 Flavonoids
The aerial parts of S. cordifolia were detected with a C-flavonol glycoside, namely,
3′-(3″,7″-dimethyl-2″,6″-octadiene)-8-C-β-D-glucosyl-kaempferol 3-O-β-D-
glucoside, and two flavones such as 5-hydroxy-3-isoprenyl flavones and 5,7-
dihydroxy-3-isoprenyl flavones (Sutradhar et al. 2007b, 2008; Chaves et al. 2013).
Similarly, three more flavonol C-glycosides, namely, 6-(isoprenyl)-3-methoxy-8-C-
β-D-glucosyl-kaempferol 3-O-β-D-glucosyl [1→4]-α-D-glucoside, 3′-(3″.
7″-dimethyl-2″0.6″-octadiene)-8-C-β-D-glucosyl-kaempferol-3-O-β-D- glucoside,
and 3′-(3″. 7″-dimethyl- 2″0.6″-octadiene)-8-C-β-D-glucosyl-kaempferol-3-O-β-
D-glucosyl[1→4]-α-D-glucoside, were isolated from the same plant source
(Sutradhar et al. 2007b, 2008; Chaves et al. 2013).
Rao and Lakshminarayana (1984) and Ahmed et al. (2017) identified the following
fatty acids such as arachidic acid, linoleic acid, malvalic acid, myristic acid, oleic
acid, palmitic acid, sterculic acid, stearic acid, dihydrosterculic acid, and sterculic
acid from the seed oils of S. cordifolia. The occurrence of a hydroxyl unsaturated
fatty acid, (10E, 12Z)-9-hydroxyoctadeca-10,12-dienoic acid, was obtained from
the bioassay-guided fractions of methanolic leaf extracts of S. cordifolia (Nune
et al. 2006).
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22.4.4 Steroids
To date, no extensive study on the steroids in S. cordifolia has been recorded; how-
ever, Sutradhar et al. (2008) reported that the dried powder of the aerial parts of S.
cordifolia contain two steroid compounds, namely, β-sitosterol and stigmasterol.
In this section, the significant outcomes from the previous research studies on the
pharmacological activities of different isolated compounds and plant extracts of S.
cordifolia are reviewed (Tables 22.3 and 22.4).
Joseph et al. (2011) evaluated the cytotoxic activity of the ethanolic extract of S.
cordifolia whole plant and found the dose-dependent cell toxicity in HeLa cell lines.
Also, they observed that cells treated with S. cordifolia extract have arrested the
cells by apoptosis. Likewise, the ethanolic extract (70%) of S. cordifolia at 250 and
500 mg/kg bw dose had significantly restored necrotic cells, by exhibiting antioxi-
dant and anticancer activities (Mallikarjuna et al. 2013). In another study, it has
been reported that cryptolepine, an alkaloid compound of S. cordifolia, hinders the
growth of mutated osteosarcoma (MG63) cells at ≥0.5 μM within 72 h of incuba-
tion. Further, it promotes anticancer activity of a potent cyclin-dependent kinases
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528 H. Ahmed et al.
inhibitor (p21 WAF1/CIP1) expression in human colon cancer HCT116 cells hence
could be suitable for chemotherapy for osteosarcoma (Matsui et al. 2007). Likewise,
cryptolepine was previously reported to inhibit cell cycle and induce apoptosis in
human LH-60 leukemia (Dassonneville et al. 2000). The p21 WAF1/CIP1 sup-
pressed G1 and G2 M-phase cell cycle, differentiation and growth of cells in vivo
and in vitro (Gartel et al. 1996; Matsumoto et al. 1998), and because it rarely mutates
in human cancer cells, it thus serves as an attractive molecular target to suppress cell
growth in cancer cells. Recently, aqueous leaf extract of S. cordifolia was capped
with silver nitrate solution to form nanoparticles (AgNPs) which showed anticancer
activity against EAC and HT-29 cell lines with IC50 value of 204.7 and 129.3 μg/ml,
respectively (Srinithya et al. 2016).
Many progressive loss and degenerative functions of neuron tissues cause adverse
effect on health and well-being of millions of people globally leading to diseases
such as Parkinson’s, Alzheimer’s, schizophrenia, amyotrophic lateral sclerosis,
Huntington’s, and many more. S. cordifolia had been previously reported to be
administered for neuron disorders such as facial paralysis, Parkinson’s disease, and
hemiplegia by the ancient Ayurveda (Nagashayana et al. 2000). Recently, emphases
on exploration of herbal drugs for their antioxidative and neuroprotection potentials
are on the increase. Aqueous extract and different fractions (hexane, chloroform,
and aqueous) of S. cordifolia were evaluated against rotenone-induced histopatho-
logical, neurochemical, biochemical, and behavioral alterations in a rat model of
Parkinson’s disease (PD).The results indicated the therapeutic potential of these
polar fractions in curing PD through antioxidative activities. A dosage of 100 mg/kg
of its aqueous fractions was observed to improve biochemical, histopathological,
and neurochemical performance similar to L-deprenyl drug (monoamine oxidase-B
inhibitor) and protected against oxidative stress-induced dopaminergic
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One of the major reasons for the regeneration of neurons is the inability of a biologi-
cal system to ready detoxify imbalance production of reactive oxygen species.
Swathy et al. (2010) reported that ethanol aerial and root extract of S. cordifolia
possess effective free radical scavenging activities. S. cordifolia root is the major
ingredient used in the treatment of neurological disorder in Ayurveda medicine, and
Sutradhar et al. (2007a) validated S. cordifolia ethanol extract for its neurological,
antioxidant, and anti-inflammatory activities and found comparable results to that
of a commercial standard drug, deprenyl (Swathy et al. 2010).
Coronary diseases may lead to irreversible necrosis of heart muscles and adversely
heart attack. Hence the use of alternative and complementary medicine in treatment
of ailments such as myocardial infarction (MI) and other cardiac-related morbidities
are gaining attention worldwide; however, many efforts were relented to provide
scientific evidence on ethnopharmacology efficacy of different herbs.
Histopathological observations and biochemical findings revealed therapeutic
potential of hydroalcoholic leaf extract of S. cordifolia doses at 100 and 500 mg/kg
significantly increased endogenous antioxidants superoxide dismutase (SOD) and
catalase in heart tissue homogenate (HTH); this ascertains its potency and protec-
tive activity in the treatment of MI in traditional medicine (Kubavat and Asdaq
2009). Simultaneous increase in SOD and catalase are the indicators of cardiopro-
tection (Yim et al. 1990).
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530 H. Ahmed et al.
For decades, research studies have shown that S. cordifolia products help to reduce
weight by reducing the fat accumulation in cell tissues and lowering blood sugar
(Jain et al. 2011). The methanol extract of S. cordifolia aerial parts at 600 mg/kg
showed the maximum hypoglycemic activity and significantly decreased (31%)
blood sugar level in mice after 2 h of administration (Kanth and Diwan 1999).
Ahmad et al. (2014) observed the potency of alcoholic extract of S. cordifolia at
400 mg/kg to decrease triglycerides, total cholesterol, low density lipids, plasma
urea, plasma creatinine, lipid peroxidation, and total cholesterol and significantly
increased superoxide dismutase and catalase activity in diabetic rat and also pro-
tected cell membrane damages.
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A bioassay was carried out to evaluate the anthelmintic activity of aqueous and
ethanol extracts of S. cordifolia on earthworm (Pheretima posthuma). The results
revealed that both the extracts showed the anthelmintic properties, but aqueous
extract was more promising and, hence, recommended in use in folklore medicine
(Pawa et al. 2011). Similarly, Nathaniel et al. (2014) stated that methanol and aque-
ous extracts of S. cordifolia exhibit the anthelmintic effect against P. posthuma. A
chemical isolate from root of S. cordifolia possessed anthelmintic, antifertility, and
anti-protozoan activity against Ascaridia galli and Hymenolepis nana (Harborne
et al. 1998; Khare 2004), thereby validating the efficacy and relevance of S. cordi-
folia in ethnomedicine uses.
Oral dose of 500 mg/kg methanol extract (aerial part) of S. cordifolia showed effec-
tive anti-ulcerogenic activity against ethanol (95%) and aspirin in Wistar albino rat
(Philip et al. 2008). A study conducted by Akilandeswari et al. (2013) involving
albino rats induced with peptic ulcer by administration of aspirin, ethanol, and aspi-
rin + pylorus ligation in 0.2% agar treated with 100 mg and 200 mg/kg ethanol leaf
extract of S. cordifolia resulted in reduced acidity and gastric secretion similar to
famotidine, while at 200 mg/kg high significant potency was observed greater than
famotidine, indicating that the extract possessed antiulcer property against the three
ulcer-causing models.
The traditional medical practices in India, Brazil, China, and other countries use S.
cordifolia for treating several health problems such as asthma, bronchitis, inflam-
mation of oral mucosa, nasal congestion, rheumatism, gonorrhea, neurological dis-
orders, and dysentery. Modern studies have witnessed the occurrence of various
bioactive principles in the plant. The major compounds included ephedrine,
Ψ-ephedrine vasicine, vasicinone, β-sitosterol, and stigmasterol. Also, several flavo-
noids and fatty acids such as arachidic acid, linoleic acid, malvalic acid, etc. were
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532 H. Ahmed et al.
found in their plant parts. Studies have shown that the plant possesses anticancer,
anti-inflammatory, neurodegenerative, cardioprotective, antimicrobial, hypoglyce-
mic, analgesic, anthelmintic, and antiulcer activities. Most of these biological prop-
erties could be correlated to the occurrence of wide-ranging biologically active
constituents in both plant extracts and essential oil. The available literature confirms
the pharmacological significance of S. cordifolia, and it can be a good source of
natural products. More recently, plant-based compounds are much appreciated by
nutraceutical and pharmaceutical industries as they are relatively safe and cause no
or negligible side effects in the treated patients. It is important to note that most of
the research efforts in S. cordifolia are limited to only plant extracts, and only few
bioactive metabolites have been isolated so far. Hence, more phytochemical and
metabonomic investigations using modern analytical tools such as electron ioniza-
tion (EI), electrospray ionization (ESI), matrix-assisted laser desorption/ionization
(MALDI), and MALDI time-of-flight mass spectrometry (MALDI-TOF MS) meth-
ods are crucially required to identify and quantify unknown compounds with bio-
logical significance from this medicinal plant. In addition, the isolated and pure
compounds need to be validated for their effectiveness using both in vitro and
in vivo models. The presence of some compounds such as vasicinone, a bronchodi-
lator, authenticates its use in the traditional medicines of Ayurveda in India.
However, compounds like ephedrine and cryptolepine of S. cordifolia still pose a
great concern about its safety and require evaluation of their toxicity. Cryptolepine
and plant extracts have shown a positive response against few cancer cell lines sug-
gesting the possible use of S. cordifolia against cancer. Further research efforts are
required to isolate and validate many such novel anticancer lead molecules occur-
ring in the plant extracts. To date, in vivo studies related to bioactivity and toxicity
using animal models are inadequate, and there is no information on the clinical
aspects of S. cordifolia extracts or its compounds, though widely used in different
traditional medicines. Importantly, S. cordifolia is morphologically similar to other
closely associated Sida species and often leads to misidentification. Therefore, cor-
rect taxonomical authentication is very critical to make use of the plant for com-
mercial purposes. Therefore, more research studies should be encouraged so as to
completely utilize this medicinal herb to treat various human illnesses including
cancer.
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