Herbal Medicines for Diabetes Mellitus: A Review sphinxsai july sept 2010 vol2 3 pharmtech Some of these herbal plants and their active chemical constituents which have a role in the management of diabetes mellitus are compiled here and discussed in this review Key words Diabetes mellitus, hypoglycemic agents, herbal medicines, sulphonylureas, biguanides Introduction
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Journal of PharmTech Research CODEN (USA): IJPRIF ISSN : Vol.2,
C.Madhusudhana Chetty Dept.
Kadapa – 516 126,
Abstract: Diabetes mellitus is one of the common metabolic disorders and 2.8% of the population suffers from this
disease throughout the world and it may cross 5.4% by the year 2025.
Oral hypoglycemic agents like sulphonylureas and biguanides are still the major players in the management of the disease but there is growing interest in herbal remedies due to the side effects associated with the oral hypoglycemic agents.
They are widely used today indicating that herbs are a growing part of modern,
besides having natural therapeutic values against various diseases and considerable works have been done on these plants to treat diabetes mellitus,
describes that the antidiabetic activity of medicinal plants is due to the presence of phenolic compounds,
coumarins and other constituents which show reduction in blood glucose levels.
Some of these herbal plants and their active chemical constituents which have a role in the management of diabetes mellitus are compiled here and discussed in this review.
and hypoinsulinaemia it leads to decrease in both insulin secretion and insulin action.1 It is frequently associated with the development of micro and macro vascular diseases which include neuropathy,
cardiovascular and cerebrovascular diseases.2 The disease is associated with reduced quality of life and increased risk factors for mortality and morbidity.
The long-term hyperglycemia is an important factor in the development and progression of micro- and macrovascular complications3.
The worldwide prevalence of diabetes for all age groups was estimated to be 2.8% in 2000 and it is projected to be 5.4% in 2025.
Currently available therapies for diabetes include insulin and various oral antidiabetic agents such as sulfonylureas,
α-glucosidase inhibitors and glinides.
there is growing interest in herbal remedies due to the side effects associated with the oral hypoglycemic agents (therapeutic agent) for the treatment of diabetes mellitus.
it plays important role in the management of diabetes mellitus.4 In recent years,
herbal medicines have started to gain importance as a source of hypoglycemic agents.
Marles and Farnsworth estimated that more than 1000 plant species are being used as folk medicine for diabetes.5 Biological actions of the plant products used as alternative medicines to treat diabetes are related to their chemical composition.
and other constituents which show reduction in blood glucose levels.6,
fewer side effects in clinical experience and relatively low costs,
herbal drugs are prescribed.10 Medicinal and herbal plant
M.Upendra Rao et al /Int.J.
products are traditionally used from long ago in many countries for the treatment of diabetes mellitus.
The ethnobotanical information reports about 1000 plants that may possess antidiabetic potential among them,
this review article enumerates some medicinal plants possessing hypoglycemic properties and elucidating their mechanisms of action such as Bauhinia forcata,
and method of experiment on animals and therapeutic efficiency of plant extracts were exploited.
Some of the important anti-diabetic potential herbal plants source and their active principles are given in the Table: 1
Table 1: Important anti-diabetic potential herbal plants source and their active principles Botanical name
moupinamide Arecaine and arecoline Germacranolide Azadirachtin and nimbin
Bauhinia forcata Beta vulgaris Boerhavia diffusa Camellia sinensis Capparis decidua Cinnamomum zeylanicum Combretum micranthum Elephantopus scaber
Bulbs Fruits Seed Leaves and flowers Leaves,
flowers & seed Leaf Root Whole plant Leaves Fruit Bark
Gymnema sylvestre Gynandropsis gynandra Lantana camara Liriope spicata Momordica charantia Ocimum sanctum Panax quinquefolius Parinari excelsa Phyllanthus amarus Prunus amygdalus Pterocarpus marsupium Punica granatum Ricinus communis Salacia oblonga wall Sarcopoterium spinosum Smallanthus sonchifolius Swertia punicea
Terpenoid and 2,6,23 trienolide Leucodelphinidin and leucopelargonin Dihydroxy gymnemic triacetate N,N-diethyltoluamide
Verbenaceae Liliaceae Cucurbitaceae Labiatae Araliaceae Chrysobalanaceae Phyllanthaceae Rosaceae Leguminosae Lythraceae Euphorbiaceae Celastraceae Rosaceae
quercertin Phyllanthin amygdalin Kenotannic acid,
punicalin Ricinolic acid salacinol Catechin and epicatechin
uctuanin Methyl swertianin and bellidifolin Tinosporone,
betacyanins Punarnavine and ursolic acid caffeine and catechins Spermidine Isocodonocarpine Cinnamaldehyde,
Trigonella foenum graecum Vernonia anthelmintica Withania somnifera
Leaves and seeds
Important medicinal plants having antidiabetic potential: Bauhinia forficata Bauhinia forficata is the most widely used herbal medicine for control of diabetes in Brazil,
where it is known as Pata de Vaca (cows hoof).11 The fresh leaves are the essential part of this plant which shows the hypoglycemic activity and the genus Bauhinia belongs to the family Caesalpiniaceae.12 The initial reports of Bauhinia forficata antidiabetic activity in diabetic patients were made by Juliani (1941) 13 and Juliani (1931).
Pepato et al (2002) Bauhinia forficate decoction was prepared by boiling 150 g of fresh leaves in 1 litre of water for 5 min,
allowed the decoction to stand for 30 min and filtered.
The rats which are used for the experiment were fed a normal laboratory chow diet containing (wt./wt.) 16% protein,
diabetic and non diabetic groups,
followed by administered the streptozotocin (STZ) 40 mg/kg body weight,
after 3 days the serum and urinary glucose levels were increased.
Then one group was injected with Bauhinia forcata decoction and another with the drinking-water as control group.
After 31 days of treatment the diabetic group treated with decoction showed a significant reduction in plasma glucose and urinary glucose.
So the pharmacological,
histological and chemical studies are needed to elucidate the exact mechanism of action of Bauhinia forficata leaf decoction and to isolate any active compounds.
Gymnema sylvestre Gymnema sylvestre (Asclepiadaceae) is emerging as a potential treatment for the management of diabetes,
the leaves of this plant is used in herbal medicine preparations.
Gymnema is a plant used in India and parts of Asia as a natural treatment for diabetes or “sweet urine.” The hypoglycemic (blood sugar lowering) action of Gymnema leaves was first documented in the late 1920s.16 The Gymnema sylvestre crude extracts and its isolated compound dihydroxy gymnemic triacetate shows hypoglycemic effect against streptozotocin induced diabetic rats in dose and time dependent manner17.
This hypoglycemic effect was due to the ability of gymnemic acids to delay the glucose absorption in the blood.
Gymnemic acid molecules fill the receptor location in the absorptive external layers of the intestine thereby preventing the sugar molecules absorption by the intestine,
which results in low blood sugar level.18 And also the reduced glucose levels are exerted by the crude extract due to the presence of dihydroxy gymnemic triacetate had the ability to release the insulin by the stimulation of a regeneration process and revitalization of the remaining beta cells.19,
without compromising cell viability.22 The plasma glucose and insulin levels of the normal rats administered with dihydroxy gymnemic triacetate were not altered indicating its normoglycemic effect of the novel compound.
The characteristic loss of body weight associated with STZ-induced diabetes is due to increased muscle wasting in diabetes.23 By reviewing all the literature we conclusively affirm that the novel compound dihydroxy gymnemic triacetate which was isolated from the leaves of Gymnema sylvestre represent a good candidate for alternative and/or complementary medicine in the management of diabetes mellitus,
since they exhibited beneficial effects on the blood glucose levels and associated biochemical parameters of STZ induced diabetic animals.
Further clinical trials on human subjects are recommended for further prospects of the compound can be used as a drug.
Ricinus communis Ricinus communis is the traditional medicine which was used for the management of Diabetes mellitus.
and it was cultivated all over India for getting its seed oil.
Castor oil have been used in classical Egyptian and Greek medicine and their use has been described in the Susruta and Ayurveda as early as sixth century B.C.
root and seed oil of this plant have been used for the treatment of inammation and liver disorders.25 Fifty percent of ethanolic extract of the root,
stem and leaves of this plant showed hypoglycemic activity in normal animals and antihyperglycemic activity in diabetic animals in initial screening studies.26 The Administration of the ethanolic extract for a long duration led to a significant diminution of Blood Glucose in the diabetic rats,
there was no signicant alteration in the Blood Glucose of the control animals.
The 50% ethanolic root extracts of Ricinus communis showed a dosedependent effect on Blood Glucose of diabetic animals up to a dose of 500 mg/kg body weight.
higher doses up to 2000 mg/kg body weight did not show any dose-dependent effect and a maximum decrease in blood Glucose was observed at 8th hour.
The significant hypoglycemic effect was observed at 500 mg/kg body weight of 50% ethanolic extract which decreases the Blood Glucose to 166 ± 19 from an initial level of 371 ± 21 mg/dl.
Out of the twenty column-puried fractions of 50% ethanolic root extracts were tested for antihyperglycemic activity in diabetic rats,
only one fraction (R18) showed a signicant decrease in blood glucose of the diabetic rats.
Fraction R18 decreased the Blood Glucose to 294 ± 60 (22.4% decrease),
respectively from an initial value of 379 ± 72 mg/dl at the beginning of the experiment.27 The results of this plant showed a potent blood glucose lowering activity,
both in the normal as well as alloxan diabetic rats.
The effective dose of Ricinus communis was found to be 500 mg/kg body weight.
not only signicantly lowered the Blood Glucose of the diabetic animals to almost normal level,
but also increased the insulin levels and caused improvement in lipid prole and body weight of the diabetic animals.
though further comprehensive pharmacological investigations are needed to elucidate the exact mechanism of action of the Ricinus communis root extract.
Swertia punicea Swertia plants are most widely used traditional medicines in the treatment of diabetes.
which was treated successively with petroleum ether,
the major class of compounds among the chemical constituents of this genus,
have been reported to show signicantly hypoglycemic activities.
the Ethanol extracts and Ethyl acetate soluble fraction of Swertia Punicea showed hypoglycemic effects in STZ-induced type-2 diabetic mice and may be
benecial to improvement of insulin resistance (IR).32 The hypoglycemic activity of this plant is due to the presence of two important constituents which are Methylswertianin and Bellidifolin.
The 90%ethanolic extract of Swertia Punicea was administered to the diabetic and control group of rats.
The Fasting Blood Glucose level of the diabetic control was signicantly higher than that of normal control.
Methylswertianin and Bellidifolin at both doses signicantly reduced Fasting Blood Glucose after 1 week of administration,
and the Fasting Blood Glucose levels were stable within 4 weeks.
Both Methylswertianin and Bellidifolin at 200 mg/kg body wt.
/day produced more antidiabetic effect (signicant decreases of 44.04% and 44.48% after 4 weeks of oral administration,
respectively) than them at 100 mg/kg body wt.
/ day (decreases of 37.99% and 38.93%,
respectively).33 In previous study reports mention that the ethanol extract and the Ethyl acetate fraction of Swertia Punicea showed high anti-diabetic activities.
Now the present studies states that xanthone derivatives named as Methylswertianin and Bellidifolin,
shows significant anti-diabetic effects as well as the potential mechanism(s) of action in STZ induced type-2 diabetes in mices.
by the improvement of Insulin resistance.
So the herbal medicine Swertia Punicea plays an important role in the management of type-2 Diabetes mellitus and supports the development of new phytomedicines for Diabetes.
It is therefore possible that we may nd more useful species of Swertia for the treatment of type-2 diabetes.
Combretum micranthum Combretum Micranthum is a medicinal plant used for treating diabetes in Northwestern Nigeria.
belong to the family of Combretaceae.
more than 80% of the people depend on herbal medicines for treating their illnesses.36 The plant have also been documented to show antioxidant,
antimicrobial37 as well as antiinammatory38 properties.
The Aqueous extract of Combretum Micranthum was prepared by using Soxhlet extractor and it was dried in an evaporator at 45ºC and stored at 4ºC until ready for use.
The hypoglycemic activity of this plant extract was tested by using glucose tolerance test and fasting blood sugar assessment in normal rats.
diabetic group and nondiabetic groups.
but 100 mg/kg of the extract was found to be the optimum dose of the 3 doses.
The aqueous leaf extract of 100 mg/kg body weight dose produced a signicant reduction in blood glucose level and 24.6% maximum reduction when compared to the maximum decrease of 21.9% and 18.9% produced by 200 mg and 400 mg/kg body weight doses,
respectively.39 In this study of this plant was showed that the aqueous leaf extract of Combretum Micranthum has potential antidiabetic property for both type 1 and type 2 Diabetes mellitus.
Hence further studies are needed to study the various active constituents responsible for these properties.
Sarcopoterium spinosum Sarcopoterium spinosum species is a common medicinal plant in the Mediterranean region,
and it is widely used as an antidiabetic drug by Bedouin healers.
used by traditional Arab and Bedouin medicine for the management of diabetes,
“natsh” or “bilan”) 40,
were tested that the root extract of this plant was used for treating diabetes in Muslim folk medicine43 and a very few studies have conrmed this information and measured its antidiabetic activity.
In the late 1960s and 1980s,
several studies were performed to show the root extract of Sarcopoterium spinosum exhibits a hypoglycemic effect in rats.44 The aqueous root extract of Sarcopoterium spinosum was prepared by cutting the 100gms of fresh roots into small pieces and roots were boiled in 1 Litre of water for 30 min.
The Sarcopoterium spinosum extract (0.01,
compared to 160 ±12% increase in glucose uptake obtained by insulin.
The root extract of this plant at 0.01 mg/ml concentration showed maximum activity than lower or higher doses.
The aqueous root extract was assumed that it shows antidiabetic effect in the progressive hyperglycemia of genetically diabetic mice.
Hence the aqueous root extract of Sarcopoterium spinosum shows an insulinlike actions in targets tissues,
increases insulin secretion in vitro,
So that these results support the traditional use of herbal medicine Sarcopoterium spinosum has an antidiabetic activity.45 The extract increases glucose uptake in hepatocytes,
The Sarcopoterium spinosum extract also increases GSK3 Phosphorylation in myotubes.
The identication of active compounds in the Sarcopoterium spinosum plant extract may be the source for the development and improvement of new antidiabetic drugs.
Parinari excelsa Senegalese traditional herbals are used to manage the Diabetes mellitus
the decoction of Parinari excelsa is one of the most widely used medicinal plant.
It is a big tree that grows up to a 25 m of height.
in Congo and in Senegal particularly in Casamance.
studies reported the flavonoids of Parinari excelsa shows the hypoglycemic effect and the ability to induce insulin secretion in diabetic animal models.47,
the infusion is subjected to filtration,
and the solvent was evaporated to give the extract (yield 4%).
alloxan induced diabetic and normoglycemic rats.
The aqueous extract of Parinari excelsa is administered to both the groups at doses of 100 and 300 mg/kg/day for 7 days.
The Plant aqueous extract at 100 and 300 mg/kg/day reverse the permanent hyperglycemia induced by alloxan and the blood glucose level decreased from 3.11 ± 0.24 to 0.91 ± 0.02 g/l and 3.60 ± 0.12 to 0.85 ± 0.04 g/l,
respectively.53 The oral administration of aqueous extract of Parinari excelsa at the dose of 100 and 300 mg/kg was also reduced significantly the blood glucose level at 1/2 h,
toxicological and pharmacological investigations are underway to better characterize the active principle(s) and to evaluate the mechanism of their antidiabetic effect.
Vernonia anthelmintica Folk medicine for the treatment of Diabetes mellitus from Rayalaseema reports 26 plants with antidiabetic activity,
anthelmintica.54 The popular name of this plant is wild cumin/purple /wormseed and in Hindi it is known as Kalizeeri.
It belongs to the family Asteraceae.
The ethnobotanical information reports about 800 plants that may possess antidiabetic activity.55 Vernonia anthelmintica was found throughout in India and is an annual herbaceous plant.
The ethanolic extract of this plant seeds having the significant hypoglycemic effect in STZ induced diabetic rats.
The ethanolic extract of Vernonia anthelmintica was prepared by using (200 g) powdered seeds and these were extracted with 1 litre of 95% ethanol in a soxhlet extractor for 24 h.
The antidiabetic activity of this plant extract was studied by using normal and STZ induced diabetic rats and the blood glucose levels were determined Glucose oxidase–peroxidase method.56 The ethanolic extract of plant at a dosage of 0.25 and 0.75 g/kg body weight showed a decrease of 30.6% and 17.5% in the blood glucose levels in the diabetic rats after 6 h of treatment,
But at a dose of 100 mg/kg body weight of extract showed a signicant antihyperglycemic activity in the diabetic treated rats with a maximum fall of 82.3% in the blood glucose level after the 6th hour of treatment when compared with other fractions.57 The other species of this genus Vernonia amygdalina 58 and Vernonia colorata 59 have been reported to have antidiabetic activity.
Hence the present study of this Vernonia anthelmintica seeds shows the antihyperglycemic property in diabetic rats without any hypoglycemic action in normal rats and without evident toxic effects.
having the property to reduce the blood glucose levels in streptozotocin induced diabetic rats signicantly.
and it is family of Asteraceae.
It is a scabrescent aromatic herb distributed in the moist deciduous forests of the central Western Ghats.
the roots of Elephantopus scaber are used as an antipyretic,
cardiotonic and diuretic60 and decoction of the roots and leaves is used as emollient and it was given in dysuria,
dysentery and stomach pain.61 The aqueous extract of leaves is applied externally to treat eczema and ulcers.62 The Acetone extract of Elephantopus scaber was prepared from 1 kg dried powdered plant and it was extracted by using hexane,
acetone and methanol in a soxhlet extraction apparatus sequentially and the extracts were evaporated to dryness under reduced pressure.
The Antidiabetic property of acetone extract was determined by taking control and streptozotocin induced diabetic rats.
After 60 days of treatment with
the acetone extract of Elephantopus scaber showed a significant decrease in blood glucose level from the initial 534.6 mg/dl to 86.14 mg/dl and reached a level closer to the untreated control of 85.
augmenting glucosedependent insulin secretion and stimulating the regeneration of islets of langerhans in pancreas of STZ- induced diabetic rats.64 The administration of Elephantopus scaber acetone extract lowering the blood sugar level in streptozotocin induced hyperglycemic animals it may be due to a stimulating effect on insulin release from regenerated ß-cells of the pancreas or increased cellularity of the islet tissues and regeneration of the granules in the ß-cells.65 The signicant and consistent antidiabetic effect of acetone extract of Elephantopus scaber,
in diabetic rats indicates that this effect can be mediated by stimulation of glucose utilization by peripheral tissues.
Now the present studies indicate that the novel terpenoid isolated from Elephantopus scaber can be a useful in the management of Diabetes mellitus.
which belongs to Liliaceae family.
It is frequently used as “maidong” in prescriptions of traditional Chinese medicine for the treatment of Diabetes mellitus,
because of the high availability and safety.
The antidiabetic effect it is due to presence of two important main active components in water extracts as well as crude polysaccharides.66 The aqueous extract of Liriope spicata tuberous roots was prepared by using 500 gm of powdered material and it was boiled in distilled water for three times (1:4,
and then concentrated by using rotary evaporator at 45ºC under reduced pressure.
In previous reports,
STZ-induced type 2 diabetic studies were made by using prescribed methods in C57BL/6J and ICR mice.68,
after 28 days of treatment it shows significant decrease in the blood glucose level in streptozotocin induced diabetic rats.
The results of this study demonstrate that aqueous extract of Liriope spicata did not have any appreciable effect on Fasting Blood Glucose level in normal mice,
but it caused a marked decrease of Fasting Blood Glucose level and a signicant improvement on glucose tolerance and insulin resistance in STZ-induced type 2 diabetic mice,
and thus proving the hypoglycemic effects of aqueous extract.70 However,
further pharmacological evaluations are required to isolate and identify the active hypoglycemic and hypolipidemic principles in
the plant as well as elucidating their mechanisms of action.
affecting more than 300million people worldwide.
therapies developed along the principles of western medicine (allopathic) are often limited in efficacy,
carry the risk of adverse effects,
especially for the developing world.
treating diabetes mellitus with plantderived compounds which are accessible and do not