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  • The Internet Journal of Pharmacology
  • Volume 9
  • Number 1

Original Article

In-Vitro Evaluation Of Smilax Zeylanica Linn. Leaves For Anthelmintic Activity

V RAJESH, P PERUMAL, V CHINTHAKINDHI, S PRABHAKARAN, G HYMAVATHI, T GUNTUPALLI

Keywords

anthelmintic, pheritima posthuma, smilax zeylanica

Citation

V RAJESH, P PERUMAL, V CHINTHAKINDHI, S PRABHAKARAN, G HYMAVATHI, T GUNTUPALLI. In-Vitro Evaluation Of Smilax Zeylanica Linn. Leaves For Anthelmintic Activity. The Internet Journal of Pharmacology. 2009 Volume 9 Number 1.

Abstract

The objective of the present study was to evaluate the in-vitro anthelmintic property of various solvent extracts of Smilax zeylanica leaves against Pheritima posthuma. Various concentrations of Petroleum ether, Benzene, Chloroform and Methanol extract (20mg/ml and 40mg/ml) were used in evaluation. The activity was assessed by the determination of time of paralysis and time of death of worms. Albendazole (20mg/ml) was included as a reference standard. All the extracts were found to paralyze and kill the worms. The Petroleum ether extract and Chloroform extract showed a potent anthelmintic activity compared to standard drug albendazole. Benzene extract was less potent to cause paralysis and death at 20mg/ml and 40mg/ml, which took more time to paralyze and death. Methanol extract was less potent to cause paralysis at 20mg/ml and 40mg/ml, but caused death of worms earlier than albendazole. It is concluded that the anthelmintic efficacy of solvents extracts of Smilax zeylanica might be attributed to the presence of phytochemicals.

 

Introduction

Helminth infections are among the most common infections in man, affecting a large proportion of the world’s population. Parasitoses have been of concern to the medical field for centuries and helminths still cause considerable problems for human beings and animals. During the past few decades, despite numerous advances made in understanding the mode of transmission and the treatment of these parasites, there are still no efficient products to control helminthes and the indiscriminate use of some drugs has generated several cases of resistance. Furthermore, it has been recognized recently that anthelmintic substance having considerable toxicity to human beings are present in foods derived from livestock, posing a serious threat to human health. Consequently, the discovery and development of new chemical substances for helminth control is greatly needed and has promoted studies on traditionally used plants which is generally considered to be very important source of bioactive substances.

It was observed from ayurvedic literature and ethanobotanical studies that the plant Smilax zeylanica, found in hill tracks of Karnataka, Kerala and Tamilnadu between a altitude of 500 - 1800m. In the folkloric system of medicine, the plant was used in veneral diseases, to promote healing of wounds, swellings, abscesses, in rheumatism and pain in lower extremities, skin diseases, leucorrhoea, colic, dysentery, dysuria and fever5,11. The present study was aimed to investigate the invitro anthelmintic activity of various solvent extracts of Smilax zeylanica leaves against Pheretima posthuma.

The literature survey revealed that no systematic studies were carried out to evaluate the anti parasite potential of Smilax zeylanica plant. Based on this, a study on the plant Smilax zeylanica was carried out to evaluate the anthelmintic activity.

Materials and Methods

Drugs and Chemicals

The following drugs and chemicals were used

Drug: Albendazole (Kemwell Pvt.Ltd, Bangalore).

chemicals: Petroleum ether AR (60-800C) Merck Specialities Pvt. Ltd.), Benzene AR (Merck Specialities Pvt. Ltd.), Chloroform AR (Nice Chemicals Pvt. Ltd.), Methanol AR (Thomas Baker Chemical Pvt. Ltd.), Tween 80. All other reagents used were of analytical grade.

Plant Material

The fresh leaves of Smilax zeylanica Linn were collected in the month of September 2009 from Yercaud hills, Tamilnadu, India. The plant material was Taxonomically identified, confirmed and authenticated by Botanical Survey of India Coimbatore, Tamilnadu, with authentication number BSI/SRC/5/23/09-10/Tech-484 and the voucher specimen was retained in our laboratory for further reference. The collected leaves were shade dried and the dried material was crushed to coarse powder with mechanical grinder. The powder was stored in an air tight container and used for successive extraction.

Extraction

The powdered leaf material was successively extracted by using soxhlet extraction. Solvents were used with increasing polarity: Petroleum ether, benzene, chloroform and methanol. The extracts were evaporated to dryness and phytochemical screening were performed1,3.

Animals: Swiss albino mice of female sex weighing 20-25gms were employed for toxicity study. . They were housed in standard environment condition and fed with standard rodent diet with water and ad libitum. Ethical clearance for the animal study was obtained from Institutional Animal Ethical Committee (09MP03AUG2009) of CPCSEA (887/ac/CPCSEA).

Toxicity Study

An acute oral toxicity study was performed as per OECD guidelines 423 by Acute toxic class method4. Swiss albino mice of female sex weighing 20-25gms were used for the study. Acute toxic class method is a stepwise procedure with use of three animals of a single sex per step¬. Depending on mortality or morbidity status of the animals, an average of 2-4 steps may be necessary to allow judgement on the acute toxicity of the substance. Three animals were used for each step. The animal were placed individually and observed for any sign of toxicity, morbidity or mortality during the first 24hrs, with special attention given during the first 4 hours and daily thereafter for a total of 14 days.

Evaluation of Smilax zeylanica Linn. Leaves for Anthelmintic activity

Indian adult earthworms (Pheretima posthuma) were used to study anthelmintic activity of crude extracts of Smilax zeylanica leaves. The worms were procured from vermiculture unit, Erode district. The earthworms of 3-5cm in length and 0.1-0.2cm in width were used for all experimental protocol. The earthworms resembles both anatomically and physiologically to intestinal roundworm parasites of human beings, hence used to study the anthelmintic activity2. The worms were washed with normal saline to remove all extraneous matter.

All the leaf extracts (Petroleum ether extract, benzene extract, chloroform extract and methanol extract) were evaluated for anthelmintic activity. Two doses of extract 20mg/ml and 40mg/ml were selected to evaluate the anthelmintic activity. The drug albendazole 20mg/ml was used as reference standard. The worms of equal size were divided into twelve groups containing six worms in each group. All the extracts and the standard drug solution were freshly prepared before starting the experiment. The extracts were dissolved in minimum quantily of Tween80 and the volume was adjusted to 10ml with saline water to desired concentrations (20mg/ml and 40mg/ml). Standard drug solution was prepared freshly before experiment. Different extracts and the standard drug solution were poured in petridishes labelled with extract and concentrations. Tween 80% in normal saline, volume adjusted to 10ml was used as vehicle control.

Six worms of equal size were introduced into each Petridish and time was noted. Observations were made for paralysis and death. The mean time of paralysis and death was recorded in minutes. The paralysis time was recorded when no movement of any sort could be observed except when the worms were shaken vigorously. Time for death of worms was recorded when worms neither moved while shaken vigorously nor when dipped in warm water (500C) with fading away of their body colors.

Statistical Analysis

All the grouped data were expressed as mean + SEM. The results were analyzed for statistical significance using one-way ANOVA followed by Dunnet’s test. P<0.05 were considered significant.






Result and Discussion

The percentage yield of Petroleum ether, Benzene, Chloroform and Methanol extract was found to be 2%, 1%, 1% and 19.63%.

The preliminary phytochemical analysis showed the presence of alkaloids, phytosterols in all the four solvent extracts (Pet ether, Benzene, Chloroform and methanol). The presence of Flavonoids and carbohydrates were noted in methanol extract and terpenoids in chloroform extract.

The acute oral toxicity of various extracts of Smilax zeylanica leaves were performed as per guide lines 423 (Acute toxic class method). The tested groups did not show any abnormality in the skin, fur, eyes and mucous membrane, respiratory, circulatory, autonomic and central nervous system and behavioural pattern. During the study, no deaths were observed for 14 consecutive days. From the study it was observed that the extracts were found to be safe even at 2000mg/kg oral dose.

Figure 1
Table 1. Anthelmintic activity of different extracts of leaves on Indian adult earth worm ()

All the value are expressed as mean + SEM, n=6 in each group. Values are significantly different from reference standard (Albendazole). *P<.05; ** P<.01; ***P<.001.

From the observations made which is shown in table 1, the petroleum ether extract of Smilax zeylanica leaves showed a potent anthelmintic activity when compared to standard drug albendazole. 20mg/ml Concentration of extract paralyzed the worms in 33 minutes, whereas the standard drug paralyzed the worms in 62 minutes. Higher concentration of 40mg/ml of extract showed paralysis time of 38 minutes which was found to be significant compared to standard drug (P<0.001). The worms failed to move with muscle relaxation and flaccid paralysis were noted early in petroleum ether extract compared to Albendazole 20mg/ml. Petroleum ether extract 20mg/ml caused death of worms in 213 minutes and in 40mg/ml, the worms were found dead at 209 minutes whereas Albendazole 20mg/ml caused death in 275 minutes. The fading away of body colors were noted. Haemorrhagic and Necrotic Spots were observed externally on worms.A significant difference in death time were noted in petroleum ether extract compared to albendazole (P<.001).

The Benzene extract of Smilax zeylanica leaves at 20mg/ml concentration caused paralysis in 158 minutes and death in 304 minutes and in 40mg/ml concentration, the extract caused paralysis in 112 minutes and death in 185 minutes. When compared to albendazole, the benzene extract was less potent to cause paralysis at 20mg/ml & 40mg/ml but a dose dependent anthelmintic action was noted. The extract 40mg/ml caused death in 185 minutes whereas albendazole group caused death in 275 minutes. A significant difference between extract 40mg/ml and 20mg/ml were noted (P<.001). Hence benzene extract exhibited anthelmintic activity in dose dependent manner. The fading away of body colors were noted in both concentrations. Haemorrhagic and Necrotic spots were observed externally on worms.

The chloroform extract of Smilax zeylanica leaves at 20mg/ml concentration caused paralysis of worms in 54 minutes and caused death in 131 minutes and in 40mg/ml concentration, the extract caused paralysis of worms in 52minutes and caused death in 93 minutes. When compared with albendazole, the time taken for the paralysis in both concentrations (20mg/ml & 40mg/ml) were more or less similar. No significant difference were observed (ns). The time taken for death of worms is less when compared to albendazole. Thus chloroform extract showed a significant anthelmintic activity (P<.001) compared to standard. Both the concentrations of extract paralyzed the worms with no significant difference, but a dose dependent significant difference were noted in death of worms between 20mg/ml and 40mg/ml of chloroform extract.

The methanol extract of Smilax zeylanica leaves at 20mg/ml concentration caused paralysis of worms in 97 minutes and caused death in 225 minutes and in 40mg/ml concentration, the extract caused paralysis in 80 minutes and death in 123 minutes. When compared to albendazole group, methanol extract was less potent to cause paralysis at 20mg/ml and 40mg/ml concentration, whereas the extract caused death of worms earlier than the albendazole group. A significant difference in time of death were noted between extract and albendazole group. A dose dependent anthelmintic activity was noted between the two concentrations of extract in both paralysis time and death time. The fading away of body colors were noted in both concentrations. Control worms were alive throughout the experiment.

From the results, it is clear that petroleum ether and chloroform extract showed potent anthelmintic activity than standard drug Albendazole. The Benzene extract was inactive at 20mg/ml concentration but showed a dose dependent action on paralysis and death.

The methanol extract showed a dose dependent anthelmintic activity. The time taken for death of worms were least compared to albendazole.

The findings suggest, the difference in anthelmintic activity between extracts is due to presence of active constituents responsible for anthelmintic activity

Figure 2

Figure 3

Figure 4
Figure 3: Pheritima posthuman Normal saline

Figure 5
Figure 4: Effect of Albendazole 20mg/ml on Pheritima posthuma

Figure 6
Figure 5: Effect of Petroleum ether extract of Smilax zeylanica leaves on Pheritima posthuma

5 A – 20mg/ml

5 B – 40mg/ml

Figure 7
Figure 6: Effect of Benzene extract of milax eylanica leaves on Pheritima posthuma

6A – 20mg/ml

6B- 40mg/ml

Figure 8
Figure 7: Effect of Chloroform extract of Smilax zeylanica leaves on Pheritima posthuma

7 A – 20mg/ml

7 B – 40mg/ml

Figure 9
Figure 8: Effect of methanol extract of Smilax zeylanica leaves on Pheritima posthuma

8 B – 40mg/ml

8 A – 20mg/ml

Conclusion

From the results, it is concluded that the extracts of leaves of Smilax zeylanica showed potent anthelmintic activity. Further studies using in vivo models are required to carry out and establish the effectiveness and pharmacological rationale for the use of Smilax zeylanica leaves as an anthelmintic drug. The drug may be further explored for its phytochemical profile to identify the active constituent responsible for anthelmintic activity.

Acknowledgement

The authors are thankful to the management of JKK Nataraja College of Pharmacy, komarapalayam, Tamilnadu, INDIA for providing necessary facilities to carry out the research work.

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Author Information

V. RAJESH
J.K.K. NATARAJA COLLEGE OF PHARMACY

P. PERUMAL
J.K.K. NATARAJA COLLEGE OF PHARMACY

VINAYKUMAR CHINTHAKINDHI
J.K.K. NATARAJA COLLEGE OF PHARMACY

S. PRABHAKARAN
J.K.K. NATARAJA COLLEGE OF PHARMACY

GARIKAPATI HYMAVATHI
J.K.K. NATARAJA COLLEGE OF PHARMACY

TEJASREE GUNTUPALLI
J.K.K. NATARAJA COLLEGE OF PHARMACY

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