Elaeagnus conferta: A Comprehensive Review

 

Naresh Singh Gill1, Mukta Gupta2,3*

1Rayat Institute of Pharmacy, Railmajra, SBS Nagar, Punjab, India

2Department of Pharmaceutical Chemistry, Lovely Professional University, Phagwara, Punjab, India

3Department of Pharmaceutical Sciences, I. K. Gujral Punjab Technical University, Kapurthala, Punjab, India

*Corresponding Author E-mail: mukta_gupta2k@yahoo.com

 

ABSTRACT:

Elaeagnus conferta commonly known as bastard oleaster belongs to family elaeaganaceae and is found in Vietnam, Malaysia, South China and India. It contains carotenoids, carbohydrates, phytic acid, proteins, amino acids, flavanoids, minerals and plant sterols.  E. conferta and its species has been being used for treatment of various types of diseases and it is reported to possess anti-tumour, anti-microbial, anti-viral, anti-fungal, antioxidant, anti inflammatory, anti-diabetic and cytoprotective activities. The pharmacological activities are attributed due to presence of high content of ascorbic acid and carotenoids. Despite of immense nutritional and food potential, the genus of this family is in languish situation and still needs many efforts to reach mainstream market.

 

KEYWORDS: Elaeagnus conferta, antioxidant, antimicrobial, analgesic, anti-inflammatory.

 

 


INTRODUCTION:

Eleaganus latifolia Linn. Syn. Elaeagnus conferta Roxb. is a dense thorny shrub or small bushy deciduous tree, belonging to family Elaeaganaceae, found in the lower temperate zone. The fruit is edible, long, elliptical about 4 cm in length, reddish with light freckles, and sour in taste. Fruits are commonly available in the market during February-March. Elaeagnus has high nutritional value  as the plant is contains high amount of macroelements such as nitrogen, phosphorus, potassium, calcium, magnesium, sodium and also contains microelements which includes ferric, zinc, copper and manganes1-3. It also contains carbohydrate, phytic acid, oxalate, peroxidase, catalase and superoxide dismutase4. Plant is rich in phenolic and flavanoidal content which is responsible for its antioxidant potential5. 

 

Moreover it has been reported that silver nano particles of leaf extract of Elaeagnus has been prepared which has wide application in field of pharmacology and industries6,7.  Along with the same it has also been used for treatment of diabetes, ulcer and pulmonary complaints8,9.  It is also known with names of muslendi bastard oleaster, ambgul, amboli and nurgi. The various other biologically active species of Elaeagnus are E.  angustifolia, E. oldhamii, E. kologa, E. mollis, E. parvifolia, E. pungens, E. pyriformis, E. umbellate, E. multiflora, E. commutate, E. indica, E. glabra, E. bockii, E. lanceolat, E. angustifolia which have high therapeutic potential like indigestion10,  analgesic11, antiarthritic12,13 muscle relaxant14, antinociceptive  activity15,16 antioxidant17,18, antibacterial,19 anticancer, cardio-protective20,21 and antiasthmatic22. The phytochemical assessment of E. conferta has been summarized in table 1.

 

Taxonomical Classification:

Kingdom               Plantae

Phylum                  Tracheophyta

Class                      Magnoliopsida

Order                      Rosales

Family                   Elaeaganacae

Genus                     Eleaganus conferta

 

Table I: Phytochemical assessment of E. conferta 

Constituent

Percentage

Protein

2.4 %

Fat

2.8%

Sugars

5.1%

Amino acids

1.45%

Minerals

Nitrogen

Phosphorus

Potassium

Calcium

Magnesium

Sodium

Ferrous

Zinc

Copper

Manganese

mg/100g

0.57

1.29

1338.9

280.1

1401

184.3

21.33

5.51

0.94

3.80

 

Geograhical Area:

E. conferta and their species are divided into different geographical areas, mainly grown in Vietnam, Malaysia, South China and several territories of India. More than 90 percent of natural bastard oleaster habitat is found in Europe, China, and India where the plant is widely used for its antioxidant potentials23,24. In India it is found in Himachal pardesh and subtropical and temperate of Himalaya like Darjeeling, Sikkim, Bhutan and Meghalaya25-27.

Phytochemistry:

Elaeagnus fruits contains carotenoids,  anthocyanin, carbohydrates, lipid, phytic acid, proteins, ascorbic acid, amino acids, flavanoids, minerals, plant sterols, oxalate, catalase, peroxidase, superoxide dimutase which have been used as anti-tumour, anti-microbial, anti -viral, anti-fungal, antioxidant, anti inflammatory, anti-diabetic and cytoprotective.  Bastard oleaster fruits are known for its antirheumatic, haematinic, analgesic         properties28-30,1-5. Methanol: chloroform extract of fruit of E. conferta was prepared to estimate carotenoid content and results have indicated that lycophene and β-carotene are the two major carotenoids in the flesh of E. conferta Roxb., and their content differed markedly between two genetic genotypes31. Assessment of bioactive constituents of E. conferta was carried out. The compounds which have been indentified are 1-Chloroflouoethane, Cyclopentanone, 2-Methyl n-hexadecanoic acid, 9-Octadecenoic acid, Octadecanoic acid, E-11-Hexadecenal, Hexadecanoic acid-2-hydroxy-1-(hydroxymethyl) ethyl ester, 1,2-Benzenedicarboxylic acid, dioctyl ester, 9,10 antracenedione, 1,8 dihydroxy-3-methoxy-6-methyl (Parietin) and structures of these have been confirmed by mass analysis32.


 

Figure I: Chemical constituents of E. conferta


 

 

 

 

Pharmacological activities of E. conferta:

1.     Antioxidant:

Methanolic extract of E. conferta is effective antioxidant. Free radical scavenging activity of extract was assayed by DPPH in terms of inhibitory concerntartion (IC50), effective concerntration (EC50) and anti radical power (ARP). It has been investigated that fruit of E. conferta can reduce free radical generation at a concerntration of IC50: 0.060, EC50: 2.61, ARP: 38.4433. In a more recent study total phenolic, flavanoidal, carotenoid content has been estimated in juice, acetone extract and peel extract. However it has been reported that pulp extract of E. conferta showed higher scavenging activity as compared to juice which is due to high ascorbic acid and total carotene content34,35.

 

2.     Hepatoprotective:

Potential of E . conferta dry fruit powder (ECR) in clearing blood alcohol level was determined in mice in which alcohol intoxification was introduced  by Hongxing liquor containing 65 % v/v ethanol  orally. Pretreatment of ECR at a dose of 200, 400 and 800 mg/kg was made 30 min prior to administration of alcohol and it has been reported that dose of 800 mg/kg decreased alcohol content by 21.2%. Moreover level of enzymes such as alcohol dehtdrogenase and aldehyde dehydrogenase was also enhanced by ECR, so can be used as hepatoprotective36.

 

3.     Anti-inflammatory and analgesic activity:

Anti-inflammatory activity of methanolic leave extract of E. conferta was confirmed by inhibition level of lipooxygenase (LOX) and cycloxegenase (COX). COX-2 inhibition was measured using colorimetric human COX-2 inhibition screening assay kit using 100 μg of methanol extract, whereas spectrophotometric assay was carried out for LOX-15 using different concentration (10, 25, 50, 75, 100 μg/L of leave extract. The methanol extracts of E. conferta exhibited potent inflammation inhibiting capacity about 43.85% LOX activity37,38. Traditional knowledge of employing use of E. conferta for treatment of body pain has been documented. However, its practical knowledge for about its use regarding analgesic activity requires further investigation39.

 

4.     Anti-microbial activity:

Antimicrobial activity of methanol leaf extract of E. conferta at different concerntration (10, 25, 50 and 100 μg) was investigated in gram +ve (Staphylococcus aureus, Bacillus subtilis) and gram –ve bacteria (Klebsiella pneumonia, Escherichia coli, Salmonella typhi, Shigella flexneri). Disc plates were prepared by loading different concentration of methanol extract and were incubated for 15 to 18 h at 37 0C. Diameter of inhibition zone was recorded and compared with chloramphenicol as reference. Broth microdilution method was used for determining minimum inhibition concerntration (MIC) and is more effective against gram –ve bacteria as compared to gram +ve bacteria. However high MIC values has shown that plant is poor antibacterial agent37. The MIC values of elaeagnus extract against different gram +ve and gram –ve micro-organisms is summarized in table II.

 

Table II: Antimicrobial activity of E. conferta

Bacteria                  

Minimum inhibitory Concentration (MIC)

Klebsiella pneumonia

243.6

Staphylococcus aureus

247.3

Escherichia coli

245.5

Salmonella typhi

240.1

Shigella flexneri

242.6

Bacillus subtilis

179.8

 

Pharmacological activities of another species of Elaeagnus:

Many other species of genus Elaeagnus is found to be used for treatment of various types of ailments. These are commonly used as antioxidant, antiageing, muscle relaxant, analgesic, antiulcer etc. The pharmacological activities of some of the species of genus Elaeagnus have been summarized in the table III.

 

Table III: Biological activities of species of Elaeagnus

S. No.

Plant Name

Pharmacological activities

1

Elaeagnus angustifolia

Muscle relaxant38, diuretic39, antipyretic40, analgesic41, antinociceptive activity42 , antiarthritic43, 44, antioxidant45, 46 and Antimicrobial47

2

Elaeagnus kologa

Antioxidant, antibacterial, anticancer48, insecticidal49,Analgesic, antipyretic50 and protein supplement51

3

Elaeagnus mollis

Heart disorders52 , antioxidant and antiageing53

4

Elaeagnus oldhamii

Anticancer54, analgesic and anti-inflammatory55,56

5

Elaeagnus parvifolia

Cardiac stimulant, astringent, expectorant and anticancer57

6

Elaeagnus pungens

Antiasthmatic, antitussive, expectorant58,59 and bronchodilator60

7

Elaeagnus pyriformis

Antioxidant61, antiageing, cardioprotective and nutrient supplement62,63

8

Elaeagnus umbellate

Antioxidant, expectorant, astringent, antibacterial, antifungal and insecticidal64-68

9

Elaeagnus multiflora

Antioxidant, anti-inflammatory and skin whitening properties69-71

10

Elaeagnus commutata

Antioxidant and astringent 72

11

Elaeagnus indica

Larvicidal73-75, anticancer activity76,77 and antioxidant and antiproliferative78

12

Elaeagnus glabra

Anticancer, antiasthmatic, antibacterial and antidiarrhoeal79,80

13

Elaeagnus bockii

Leucoderma treatment81

14

Elaeagnus lanceolata

Antiasthmatic, antitussive and expectorant 82,83

 

CONCLUSION AND DISCUSSION:

The present study contributes data base of traditional knowledge of uses of E. conferta in treatment of many diseases. It also involves discussion about phytochemical and pharmacological studies of E. conferta and its species have been studied for their various pharmacological activities like antioxidant, anti-microbial, analgesic, and anti-inflammatory and hepatoprotective. The information of this plant is very limited towards the research scientists and this review provide a limited introduction of this plant and so this plant has been used for the future purpose

 

ACKNOWLEDGEMENT:

Authors are highly thankful to Dr. Monica Gulati, Head of School of Pharmaceutical Sciences, Lovely Professional University, Phagwara for providing necessary research facilities and also thankful to management of Lovely Professional University, Phagwara.

 

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Received on 20.02.2018               Modified on 12.03.2018

Accepted on 26.04.2018              © RJPT All right reserved

Research J. Pharm. and Tech 2018; 11(6): 2667-2671.

DOI: 10.5958/0974-360X.2018.00494.8