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SHORT COMMUNICATION
Year : 2013  |  Volume : 4  |  Issue : 1  |  Page : 61-64  

Antitussive, expectorant activity of Marsilea minuta L., an Indian vegetable


1 Department of Pharmaceutical Chemistry, Creative Educational Society's College of Pharmacy, Chinnatekur, Kurnool, Andhra Pradesh, India
2 Department of Pharmaceutical Science, Assam University, Silchar, Assam, India
3 Oil Technological Research Institute, JNTU Anantapur, Anantapur, Andhra Pradesh, India
4 Department of Pharmacology, Creative Educational Society's College of Pharmacy, Chinnatekur, Kurnool, Andhra Pradesh, India

Date of Web Publication20-Feb-2013

Correspondence Address:
Raja Chakraborty
Department of Pharmaceutical Chemistry, Creative Educational Society's College of Pharmacy, Chinnatekur, Kurnool, Andhra Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2231-4040.107502

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   Abstract 

Marsilea minuta L., an aquatic or sub-aquatic fern used as a vegetable, has wide applications in traditional/folk medicine in India and Bangladesh. In our study, we evaluated the antitussive, expectorant activity of M. minuta crude extracts. The antitussive activity of M. minuta methanol, ethyl acetate, and petroleum ether extracts was evaluated using ammonia and sulfur dioxide induced mice coughing. The expectorant activity was evaluated by the volume of phenol red in mice's tracheas. Extracts significantly increased mice's cough latent period and inhibited the frequency of cough induced by ammonia and sulfur dioxide, and improved tracheal phenol red output in expectorant evaluation. Methanol extract produced the highest activity in all tested models. Methanol extract at 500 mg/kg showed 59.5% and 55.8% inhibition in the number of coughing induced by ammonium liquor and SO 2 , respectively, while it showed 89.3% increase in phenol red secretion at the same dose, which showed superior activity compared to other extracts. The present study provided evidence for M. minuta to be used as an antitussive and expectorant in Indian folk medicine.

Keywords: Antitussive, expectorant, folk medicine, Marsilea minuta


How to cite this article:
Chakraborty R, De B, Devanna N, Sen S. Antitussive, expectorant activity of Marsilea minuta L., an Indian vegetable. J Adv Pharm Technol Res 2013;4:61-4

How to cite this URL:
Chakraborty R, De B, Devanna N, Sen S. Antitussive, expectorant activity of Marsilea minuta L., an Indian vegetable. J Adv Pharm Technol Res [serial online] 2013 [cited 2021 Oct 21];4:61-4. Available from: https://www.japtr.org/text.asp?2013/4/1/61/107502


   Introduction Top


Marsilea minuta L., a common aquatic or sub-aquatic fern well-known as "susnisak" in Tripura, India, is a member of Marsileaceae family. [1],[2] The leaves and shoots of the plant are commonly used as vegetable, and it finds extensive application in the treatment of cough and respiratory troubles. Juice of the fresh shoots and decoction of leaves are used to treat cough and other respiratory troubles by the people of India and Bangladesh. [2-4] The plant is widely used in different traditional and folk medicinal systems for its medicinal value, and recommended for the treatment of psychopathy, diarrhea, respiratory diseases, and skin diseases. [2],[5],[6] The young fronds of the plants are used to treat insomnia and mental problems, while regular eating of the plant is believed to exert favorable effects on hypertension, sleeping disorders, and headache. The plant is also recommended to treat spastic condition of leg and muscle, epilepsy, and migraine. [1],[2],[5],[6],[7] Leaves of M. minuta are prescribed by folk medical practitioners to treat diabetes and gastrointestinal disorders. [8],[9] Investigation on its chemical constituents revealed that the plant contains marceline (an ester of 1-triacontanol and hexacosanoic acid), which is known to have sedative and anticonvulsant activity. In addition, different flavonoids and marsileagenin-A (a sapogenol) were isolated from the plant. [10],[11] It has been reported that M. minuta possesses hypocholesterolemic, [12] anxiolytic, [13] antidepressant, [10] anti-aggressive, [14] antifertility, [15] antiamnestic, and antistress [16] activities.

The plant has been used as an alternative/complementary medicine for a thousand years. [17] Fruits and vegetables are a rich source of bioactive phytochemicals; therefore, regular and high intake of vegetables and fruits has been associated with a decrease in incidence of several chronic diseases like cancer, cardiovascular diseases, diabetes, etc. [18],[19]

Coughing is one of the common symptoms related to several respiratory diseases such as asthma, bronchitis, pneumonia, etc., Though a number of synthetic drugs are available in the treatment of cough, the problem is that an effective therapy against coughing will inevitably bring side effects. [20] Northeastern India is blessed with a lot of floral diversity, abound with natural medicinal potentials. Owing to their medicinal and curing properties as well as the health-boosting constituents, vegetables with medicinal property are the choice of interest in both the traditional as well as modern versions of the health care system.


   Materials and Methods Top


Chemicals

Methanol, petroleum ether, ethyl acetate, ammonium hydroxide, sodium hydrogen sulfate, sulfuric acid, ammonium chloride, and sodium bicarbonate were obtained from Sisco Research Laboratories Pvt. Ltd. (Mumbai, India) and SD Fine Ltd. (Mumbai, India). All other chemicals used in the study were obtained commercially and were of analytical grade.

Plant Materials

During the month of March/April 2011, the whole plant of M. minuta L. was collected from Tripura. The plant was identified and authenticated by Dr. B. K. Datta, Department of Botany, Tripura University, Tripura. A voucher specimen (TU/BOT/HEB/SS23072011b) was deposited at the herbarium of Plant Taxonomy and Biodiversity Laboratory, Tripura University.

Preparation of Extracts

Plants were collected and washed in running water to remove unwanted materials and dried under shade. The air-dried samples were powdered mechanically by using a grinder. Dried plant material was extracted using Soxhlet apparatus with methanol, ethyl acetate, and petroleum ether separately. The extracts were concentrated under reduced pressure. Dried methanol extract (MMM), ethyl acetate extract (EMM), and petroleum ether extract (PMM) were used to perform the study. The yield of MMM, EMM, and PMM was found to be 3.6, 3.9, and 3.2% w/w, respectively.

Experimental Animals

Healthy Albino mice (20-30 g) were used for the experiment. Animals were maintained under standard laboratory conditions at a temperature of 24 ± 1°C, with 12-h light-dark cycle. The animals had free access for water and food. Institutional Animal Ethical Committee (Reg. No. 1305/ac/09/CPCSEA) had given approval for the study.

Antitussive Activity

Ammonium liquor induced cough


Healthy mice were divided into eight groups: Control, MMM (250 and 500 mg/kg), EMM (250 and 500 mg/kg), PMM (250 and 500 mg/kg), and standard. Briefly, 1 h after oral administration of the test drug, each mouse was placed in a glass chamber and exposed to 0.3 ml 25% NH 4 OH produced by a nebulizer for 45 s. Animal was monitored during ammonia exposure. The cough frequency and latent period of cough were recorded for 6 min. [21]

Sulfur dioxide (SO 2 ) induced cough

Healthy mice were divided into several groups and drug treatment was continued for 5 days. NaHSO 3 solution in water (500 mg/kg, 2.0 ml) was placed at the base of a specially deigned desiccator and 0.2 ml of sulfuric acid was added using a pipette which resulted in the formation of sulfur dioxide. After 15 s, each mouse was placed on the stage in the desiccator and exposed to SO 2 for 45 s. The mice were then removed and placed in a clear glass chamber for counting of bouts of cough for 5 min. [22]

Expectorant Activity

After 1 week of acclimatization, mice were divided into different groups as described earlier. Ammonium chloride (0.5%, 1.0 g/kg) was used as positive control. The treatment lasted for 5 days. After 30 min of last administration, the mice were injected with 5% phenolsulfonphthalein; 40 min later, animals were dissected to take out trachea and bronchial parts. Five percent NaHCO 3 was used to flush the inside of these parts three times, 0.5 ml for each time, which were collected and centrifuged to measure the absorbance of supernatant at the wavelength of 546 nm using UV-Vis spectrophotometer. [23]

Statistical Analysis

Experimental results were expressed as mean ± standard error of mean (SEM). P values < 0.05 were regarded as statistically significant. A one-way analysis of variance followed by Tukey's tests was used for the data analysis, using Statistical Package for Social Sciences (SPSS) version 10.0 software.


   Results Top


M. minuta demonstrated having antitussive effect in in vivo experiment by prolonging the latency and reducing cough [Table 1]. MMM and EMM at 500 mg/kg reduced the number of coughs induced by ammonium liquor by 59.5% and 54.8%, and significantly increased the latency period in a dose-dependent manner. Pretreatment with codeine, MMM, EMM, and PMM at a dose of 500 mg/kg for 5 days caused 69.1%, 55.8%, 56.8%, and 34.0% inhibition of SO 2 -induced cough; lower dose of PMM failed to produce significant antitussive effect.
Table 1: Antitussive effect of M. minuta extract

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M. minuta extracts in multiple doses showed good dose-dependent expectorant activity [Table 2]. Methanol extract (500 mg/kg) exhibited high phlegm eliminating activity among the other tested extracts, but lower dose of PMM failed to produce significant activity. MMM (500 mg/kg) caused 89.3% increase in the concentration of phenol red, while EMM showed 71.43% increase at the same concentration, though the reference drug ammonium chloride produced far better activity than extracts, with 139.3% increase in the concentration of phenol red.
Table 2: Expectorant activity of M. minuta extracts

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   Discussion Top


Antitussive animal models could be designed by mechanical stimulus, electrical stimulus, and chemical stimulus. In this experiment, chemicals like ammonium liquor and sulfur dioxide were used to induce cough. These models are widely used animal models for evaluating antitussive activity of a traditional candidate medicine. [21],[22],[23] The cough latency period, which is the time interval between exposure to ammonia hydroxide or SO 2 and appearance of cough, showed the potential of the MMM and EMM on delaying cough. The longer cough latency period showed potent effect of the extract on relieving cough and the less cough times exhibited its stronger antitussive effect.

Secretion of sputum is of benefit by dephlogistication of trachea and relieving cough. Expectorant drugs generally dilute or increase the sputamentum in the respiratory tract so that it could be expectorated easily with the ciliary movement. In the study, phenol red was discharged with sputum after a few minutes of its i.p. injection into mice because the agent was removed partly from trachea. [23] The extract showed significant expectorant activity.

Several researchers have reported the beneficial effect of saponin, flavonoid, and triterpenoid in the treatment of experimentally induced cough. In traditional medicinal system, a lot of plants have been used to treat cough. Systemic study of these plants showed the presence of saponin, alkaloid, terpenoids, and phenolic compounds. [24],[25],[26] In our previous studies, we have reported the presence of sapogenol, flavonoid, and triterpenoid in the plant. [10],[11] In our previous study, we observed high content of phenolic and flavonoid compounds in the methanol extract. [27] It prompted us to lay a hypothesis that these constituents might have the antitussive and expectorant activities. However, due to the nature of multiple chemical constituents involved in the natural plants, as well as the multifactorial condition of respiratory diseases, it is very important to further separate chemical constituents from the methanol extract which are effective on the observed biological activities. Further studies are necessary to clarify the precise mechanism by which M. mimuta possesses the antitussive and expectorant activities.


   Conclusion Top


To conclude, our study indicated that the methanol extract of M. mimuta demonstrated significant antitussive and expectorant effects. These effects are the important evidence for the traditional use of M. mimuta in the treatment of cough, respiratory disorders. The isolation of bioactive constituents and the mechanism of action explained for the observed activities have not been established, and thus further investigations need to be conducted.

 
   References Top

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    Tables

  [Table 1], [Table 2]


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