Open Medicine Journal




ISSN: 1874-2203 ― Volume 5, 2018
RESEARCH ARTICLE

Standardization of Dhatryadi Ghrita: A Herbal Ghee Based Ayurvedic Medicinal Preparation



Rashmi Saxena Pal1, *, Amrita Mishra2
1 Pharmacy Department, Pranveer Singh Institute of Technology, Kanpur, India
2 School of Pharmaceutical Sciences, IFTM University, Moradabad, India

Abstract

Background:

In the current time, there is a need to thoroughly examine the process of systematic research methodology and to provide genuine findings to provide the reference for further investigations of traditional herbal medicines, which are beneficial for various disorders.

Objectives:

To standardize Dhatryadi Ghrita on various parameters, in order to assure its safety and efficacy on various grounds.

Methods:

The Ghrita was analyzed for its organoleptic, physico-chemical features and screened for its phyto-constituents as well as its chromatographic analysis.

Results:

The physicochemical standards would serve as a preliminary test for the standardization of the formulation, which helps to lay standards for further use as reference for the quality control/quality assurance laboratory of a Pharmaceutical house.

Conclusion:

The improvement of analytical methodologies can serve as a specific basis for research in herbal drug technology, thereby, facilitating the producers and researchers to set quality standards as well as parameters, so as to fulfill the requirements of regulatory bodies for the establishment of therapeutic efficacy, safety and purity of herbal drugs. The obtained values can be adopted to lay down new pharmacopoeial standards to be followed in its preparation with batch to batch consistency.

Keywords: Dhatryadi, Ghrita, Standardization, Parameters, Herbal ghee, Ayurvedic medicine.


Article Information


Identifiers and Pagination:

Year: 2018
Volume: 5
First Page: 47
Last Page: 55
Publisher Id: MEDJ-5-47
DOI: 10.2174/1874220301805010047

Article History:

Received Date: 2/6/2018
Revision Received Date: 10/8/2018
Acceptance Date: 15/8/2018
Electronic publication date: 31/8/2018
Collection year: 2018

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© 2018 Rashmi Saxena Pal.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the Department of Pharmacy, PSIT Kanpur, Kanpur, U.P, India; Tel: 9129826459; E-mail: rashmisaxenapal@gmail.com




1. INTRODUCTION

There are various Ayurvedic, herbal based dosage forms, which are properly mentioned in texts as Ayurvedic Pharmacopoeia and formulary like vati (tablets), churna (powders), asava and arishta (self-generated alcohol based elixir), snehakalpa (medicated oil), Ghrita (medicated ghee)etc. for the treatment of different diseases. Vata, Pitta and Kapha; the three fundamental energies or principles which govern the function of our bodies on the physical and emotional level constitute tridosh. They should be well balanced for proper health of the mind and soul. Vata dosh if disturbed causes 80 types of ailments whereas Pitta imbalance is responsible for 40 types of diseases [1Tripathi B R, Charaka C. Hindi Commentary of Charaka Samhita:Varanasi:Chaukhamba Surbharati Prakashan, Sutrasthan-20(10); 2009.]. Ghritas are lipid based ayurvedic formulations or medicated ghee, in which ghee is boiled with the decoction or the paste of the crude drug, so that the active constituents of drugs get transferred into ghritas [2Government of India Ministry of Health and family welfare 2nd ed. 2nd ed.2003.]. In Ayurveda, Ghee is known to be the healthiest option of edible fat, when the nutritive value is being considered, as it possesses beneficial properties and facilitate the positive effect of herbal drugs added to it in the preparation of medicated ghee [3Pal RS, Mishra A. A review on dhatryadi ghrita. Int J Res Ayurveda Pharm 2017; 8(2): 190-5.[http://dx.doi.org/10.7897/2277-4343.082111] ]. These lipid based polyherbal formulations have the capacity to cross blood brain barrier and show beneficial effects on brain tissue. Dhatryadi Ghrita is an ayurvedic medicine, also known as herbal ghee, where ghee acts as the base and is recommended for the treatment of various CNS disorders. Its main ingredient is Dhatri (Emblica officinalis) [4 ayurmedinfo.com, Dr JV Hebbar,2015 [cited 2017 March 29]. Available fromhttp://ayurmedinfo.com.]. It was a novel introduction of incorporation of additional properties along with coloration, purification and composition of ghrita. Drug administered in the form of ghee are quickly digested and absorbed. It is also able to reach the most distant areas of body like the CNS. A water soluble drug gets distributed in the extracellular spaces, but not to the intracellular ones. Whereas the lipid solubilized drugs are rapidly distributed throughout the intra and extracellular spaces [5Shastri A. Vidyotini T of Bhaishajya Ratnavali; 14th edition. Chaukhamba Samskruta Samsthana, Kustharogadhikar, Varanasi: 2001.].

In consideration of many harmful effects of chemical based agents, there is a growing need to adopt research methodology and to provide scientific grounds for the traditional plant based medicines that are supposed to be effective in various disorders. The first step for scientifically based research is to provide quality standardization of drug. With this referencing as background the present study was undertaken to ascertain the authenticity of all the ingredients of Dhatryadi Ghrita and presence of components as recommended through pharmacognostical study and physico- chemical analysis of Dhatryadi Ghrita [6 Anonymous. The Indian Pharmacopoeia. 4th edition. Govt. of India publication: New Delhi 1996., 7Amartya B, Krishanu D, Vikas S. A review on latest developments in the standardization of ayurvedic drugs. IJPRBS 2012; 1(3): 96-119.]. The Ghrita was prepared from the purified as well as standardized crude herbal constituents as per the method and the formula given in the Ayurvedic formulary. It was then standardized on various parameters in order to assure its safety and efficacy on various grounds. Standardization is beneficial for laying a solid foundation, with the help of new technologies to share, enhance and improve existing practices. Standardization is also helpful in building the standards for assisting Governments, Administrations, Regulators and also supports the development of new policy initiatives [8Pal RS, et al. Standardization of triphala churna: A polyherbal formulation. wjpls, 2016, 2(2):316-322.].

2. COLLECTION OF RAW DRUG

Raw drugs were collected from rural farms of Kanpur Dehat at the time of preparation of drug. All these were identified and authenticated from NBRI, Lucknow. Ghrita (Cow's ghee) was procured from Khadi Gramodyoga Bhandar, Kanpur and Dhatryadi Ghrita was prepared in Pharmacognosy lab of PSIT, Kanpur. The physical impurities were removed from the herbal drugs, and they were dried and made into a coarse powder to use for the pharmacognostical study. Ghrita (Table 1) was prepared as per the classical reference. A physicochemical analysis of the final product was carried out in the Pharmaceutical Chemistry Laboratory of the institute.

3. METHOD OF PREPARATION OF DHATRYADI GHRITA

After collecting all the ingredients of Dhatryadi Ghrita as mentioned in Table 1.The Ghrita was prepared according to the procedure mentioned in Ayurvedic formulary. In which the crude drugs as fresh fruits of Dhatri and Kushmanda, fresh tuberous roots of Vidari and Iksu, fresh tuberous roots of Shatavari were taken to extract out fresh juice from them, after washing and shade drying of the crude drugs. Then the other herbs as stolons and roots of Liquorice and heartwood powder of white sandalwood were cleaned, dried and powdered. Resin was added to the above powdered ingredients in order to sweeten the formulation, then sufficient quantity of purified water was added to make homogenous composition. After this, Go-Ghrita and milk was added in equal quantity as cited in Table 1, while heating with continuous stirring for about 3 hours. It was then kept overnight and was filtered next day while hot and cooled afterwards. After cooling, sugar was added and stirred vigorously.

Table 1
Contents used in Dhatryadi Ghrita.


4. ORGANOLEPTIC STUDY

Organoleptic characteristics for various sensory characters like color, taste, odouretc was carefully noted down [9Wallis TE. Wallis TE, Text book of Pharmacognosy, 5th Edition. CBS Publishers & Distributors:New Delhi 2002.-11Tandon N, Sharma M. Quality Standards of Indian Medicinal Plants 2010; Vol. 8] as illustrated in Table 2. The raw drugs and powders were separately studied by organoleptic and morphological characters like Rupa(Color), Rasa (Taste), Gandha (Odor), Sparsha (Touch), and so on.

Table 2
Organoleptic Parameters of Dhatryadi Ghrita.


5. PHYSICOCHEMICAL ANALYSIS

5.1. Loss on Drying at 110°C

  1. Place the weighed crucible with 5 gm material in tilted lid position in the oven at 105°C for at least 2 hours.
  2. Place the crucible in the desiccator by using tongs or gloves and allow cooling for at least 30 minutes.
  3. It was taken out and weighed again and again at regular interval till the consistent weight was achieved. The percentage of difference was considered as loss on drying at that particular temperature.

Deterioration time of the plant material depends upon the amount of water present in plant material. If the water content is high, the plant can be easily deteriorated due to fungus [12 Ayurvedic Pharmacopoeia of India, Part – 1, Vol – iv, First Edition, Appendix 2 / 2.9 Government of India. Ministry of health and family welfare. Department of ayush: Delhi – 2011.].

5.2. Refractive Index

Abbe's refractometer is used to measure the refractive index of the given ghrita. Using a particular monochromatic light source, the apparatus is calibrated with water as the liquid. The micrometer screw is adjusted to focus the boundary between the bright and dark regions, then the refractometer scale is adjusted to place the cross wire of the telescope exactly on the boundary between the bright and dark regions. The same process is repeated after the equipment is calibrated. A drop of water was placed on the prism and the drive knob was adjusted in such a way that the boundary line intersects the separatrix exactly at the centre, and reading was noted.

Distilled water has been found to have a refractive index of 1.3325 at 25˚C. The difference between the reading and 1.3325 gives the error of the instrument. If the reading is less than 1.3325, the error is minus (-) then the correction is plus (+) if the reading is more, the error is plus (+) and the correction is minus (-). Refractive index of Ghrita was determined using 1 drop of the sample. All fats are composed of various types of fatty acids and their derivatives, such as esters in various ratios. With changes of temperature or any other ingredients, the basic constitution of particular fat varies. Such variation may be due to the any impurities added due to any reason. Refractive index varies with temperature and wavelength [13 Ayurvedic Pharmacopoeia of India, Part – 1,Vol – iv, First Edition, Appendix 3 / 1.2 Government of India. Ministry of health and family welfare. Department of ayush: Delhi – 2011.].

5.3. Specific Gravity

Specific gravity bottle was cleaned and shaken with acetone and then with ether. Bottle was dried and weight was noted down. The specific gravity bottle was filled with the ghrita and weight was noted. The procedure was repeated using distilled water in place of Ghrita. The weight of the empty bottle with stopper was recorded. About 10 gms of Ghrita was taken, which was later cooled in a desiccator. The Ghrita was then transferred into the bottle. Then the weight of the bottle and Ghrita was noted. The bottle was again filled completely with 10 ml distilled water. The stopper was placed and the bottle was kept under constant temperature. The bottle was then taken outside, wiped clean, dried and noted. Now determine the weight of the bottle and the contents. The bottle was emptied and thoroughly cleaned, then filled with distilled water and weighed.

The weight of lipid material is affected by the factors such as basic constitution, dissolved constituents used in the preparation of formulation, or any other compound or excipient, which may be used during the process etc. In case of fat, it may also change with thermal fluctuations [14 Ayurvedic Pharmacopoeia of India, Part – 1,Vol – iv, First Edition, Appendix 3 / 1.3 Government of India. Ministry of health and family welfare. Department of ayush: Delhi – 2011.].

5.4. Rancidity Test

1ml of melted ghrita was mixed with 1ml of conc. HCl and 1ml of 1% solution of phloroglucinol in diethyl ether and then mixed thoroughly with the fat acid mixture. A pink color indicates that the fat is slightly oxidized while the red color indicates that the fat is definitely oxidized [15Arya S, Ramanujam S, Vijayaraghavan P. Refractive index as an objective method for evaluation of rancidity in edible oils and fats. J Am Oil Chem Soc 1969; 46(1): 28-30.[http://dx.doi.org/10.1007/BF02632705] , 16Dhurvey Y, Kawtikwar P, Sakarkar D. Evaluation of Physicochemical Properties of Cow Ghee before and after Hydrogenation. Int J Chemtech Res 2012; 4(1): 185-9.].

5.5. Acid Value

10g of Ghrita was taken in a conical flask. To it was added 50 ml of acid free alcohol-ether mixture (25 + 25ml) previously neutralized by the addition of 1 ml of Phenolphthalein solution and titrated against 0.1N potassium hydroxide solution. End point is figured out with the appearance of pale pink colour which persists for 15 seconds.

The acidity is affected with the process of oxidation as triglycerides get converted in to fatty acids and glycerol. Liberation of fatty acid is the outcome of hydrolysis, thermal effects and lipolytic enzymes as lipase. So, of acid value varies linearly with rancidity. In present work, acid value of Ghrita was found to be below 2 which indicated better quality [17 Ayurvedic Pharmacopoeia of India, Part – 1,Vol – iv, First Edition, Appendix 3 / 12 Government of India. Ministry of health and family welfare. Department of ayush: Delhi – 2011.].

5.6. Saponification Value

  1. 2g of fat in a tared beaker was weighed and dissolved in about 3ml of the fat solvent (ethanol /ether mixture).
  2. The contents of the beaker were quantitatively transferred three times with a further 7ml of the solvent.
  3. 25ml of 0.5N alcoholic KOH was added and mixed well, which was attached to a reflux condenser.
  4. Another reflux condenser as the blank with all other reagents was present except the fat was set.
  5. Both the flasks were placed in a boiling water bath for 30 minutes.
  6. The flask was cooled at room temperature.
  7. Now added phenolphthalein indicator to both the flasks and titrated with 0.5N HCl .
  8. Noted down the endpoint of blank and test .
  9. The difference between the blank and test reading gives the number of millilitres of 0.5N KOH required to saponify 1g of fat.

Saponification value or number of fat = mg of KOH consumed by 1g of fat.

The long chain fatty acids present in fats have a low saponification value because they have a relatively fewer number of carboxylic functional groups per unit mass of the fat, when compared to short chain fatty acids. Medium-chain triglycerides are considered as good biologically inert source of energy that is easy for the human body to metabolize. They passively diffuse from the GI tract to the portal system without requirement for modification like long-chain fatty acids or very-long-chain fatty acids [18 Ayurvedic Pharmacopoeia of India, Part – 1,Vol – iv, First Edition, Appendix 3 / 10 Government of India. Ministry of health and family welfare. Department of ayush: Delhi – 2011.].

5.7. Iodine Value

10ml of fat sample was pipetted out and dissolved in chloroform to an iodination flask labelled as “TEST”. 20ml of Iodine Monochloride reagent was added into the flask. The contents in the flask are thoroughly mixed. Then the flask is allowed to stand for half an hour in the dark.

Set up a BLANK in another iodination flask by adding 10ml Chloroform to the flask.

Add to the BLANK, 20ml of Iodine Monochloride reagent and the contents were mixed in the flask thoroughly. The BLANK was incubated in dark for 30 minutes. Meanwhile, the TEST was taken out from incubation after 30 minutes and 10 ml of potassium iodide solution was added into the flask.

The stopper and the sides of the flask was rinsed using 50 ml distilled water. The “TEST” against standardized sodium thiosulphate solution was titrated until a pale straw colour is observed. About 1ml starch indicator was added into the contents in the flask, and a purple colour is observed. The titration is continued until the color of the solution in the flask turns colourless. The disappearance of the blue colour is recorded as the end point of the titration.

Heat increases the dissociation and unsaturation of the molecules of compound [19 Ayurvedic Pharmacopoeia of India, Part – 1,Vol – iv, First Edition, Appendix 3 / 11 Government of India. Ministry of health and family welfare. Department of ayush: Delhi – 2011.]. Physicochemical analysis such as loss on drying at 110oC, water soluble extractive, Total ash, Acid insoluble ash, Alcohol soluble extract (Table 3). Specific gravity and refractive index tests were carried out [20-22Khandelwal KR. Practical Pharmacognosy 2008.].

Table 3
Physico-chemical parameters of Dhatryadi Ghrita.


6. PHYTOCHEMICAL SCREENING: QUALITATIVE TESTS

6.1. Phytochemical Qualitative Analysis

The plant extracts in ethanolic solutions were assessed for the existence of the phytochemical analysis by using the following standard methods [23Debiyi OO, Sofowora FA. Pytochemical screening of medical plants. Iloyidia 1978; 3: 234-46.-26Trease GE, Evans WC. “Phenols and phenolic glycosides,” in Textbook of Pharmacognosy, vol. 12, pp. 343–383, Balliese, Tindall and Co Publishers, London, UK, 1989.]. Tests for different active principles Dhatryadi Ghrita was subjected to qualitative tests to detect the various phytoconstituents as- Carbohydrates, lipids, alkaloids, terpenoids, tannins, proteins etc. Materials were dissolved separately in 5 ml of alcohol and filtered; the filtrates were used to test the presence of carbohydrates [27Kokate CK, Purohit AP, Gokhale SB. Pharmacognosy. 42nd ed. Pune: NiraliPrakashan, 2008; 6.1: A1].

6.2. Benedict’s Test

Filtrate was subjected to treatment with Benedict reagent and then heated on water bath, formation of an orange red precipitate indicates the presence of reducing sugar.

6.3. Detection of Protein and Amino Acids as in Millon’s Test

The alcoholic extracts were treated with 2 ml of millon’s reagent. The formation of white precipitate which turns to red upon heating indicates the presence of proteins.

6.4. Detection of Alkaloids

The extract was dissolved individually in dilute HCL and filtered. The filtrates were treated with alkaloid reagent.

6.4.1. Hagers Test

Filtrates were treated with Hagers reagent (solution of picric acid) formation of yellow precipitate indicates the presence of alkaloids.

6.4.2. Foam Test

To the 5 gm drug powder, water was added in the test tube and shaken for 5 minutes. Formation of persistent froth confirms the presence of saponin glycosides.

6.5. Detection of Phenol and Tannins (Ferric Chloride Test)

The alcoholic extract was treated with few drops of neutral ferric chloride solution. The appearance of either of green, orange, blue or purple- red color indicates the positive test.

6.6. Detection of Terpenoids

2 ml of the alcoholic extract was dissolved in 2ml of CHCl3 and evaporated to dryness. 2ml of conc. H2SO4 was then added and heated for about 2 minutes. Development of a grayish color indicates the presence of terpenoids.

6.7. Thin Layer Chromatography

Thin layer chromatography was performed for ghrita using solvent Toluene and Ethyl acetate in 6:4 ratio [28 Egon Stahl, 1969 reprint, Thin Layer Chromatography, Springer publication, 2005124-241.-30Heftmann E. Chromatographya laboratory handbook of chromatographic and electrophoretic methods. 3rd ed. Princeton MJ: Van Nostarand; 1975.].



Table 4
Phytochemical screening parameters of Dhatryadi Ghrita.


TLC profile of unsaponifiable matter, the TLC profile of unsaponifiable matter of the sample (Fig. 1) showed two prominent spots at Rf 0. 4 (blue), 0. 86 (blue). Thin layer chromatography profile of Ghrita (Hexane Extract) was developed by using Benzene and Ethyl acetate in 9:1 ratio as solvent system and the plate were visualized in UV chamber at long wavelength (366nm). The stationary phase is applied onto the plate uniformly and then allowed to dry and stabilize. These days, however, ready-made plates are preferred.

Fig. (1)
Prepared Dhatryadi ghrita.


With a pencil, a thin mark is made at the bottom of the plate to apply the sample spots. Then, samples solutions are applied on the spots marked on the line in equal distances. The mobile phase is poured into the TLC chamber to a leveled few centimeters above the chamber bottom. A moistened filter paper in mobile phase is placed on the inner wall of the chamber to maintain equal humidity (and also thereby avoids edge effect this way). Now, the plate prepared with sample spotting is placed in TLC chamber so that the side of the plate with the sample line is facing the mobile phase. Then the chamber is closed with a lid. The plate is then immersed, such that the sample spots are well above the level of mobile phase for development. Allow sufficient time for the development of spots. Then the plates are removed and allowed to dry. The sample spots can now be seen in a suitable UV light chamber, or any other methods as recommended for the said sample. The Rf of spots exhibited was measured using scale.

7. RESULTS AND DISCUSSIONS

Organoleptic evaluation was performed for coarse powders and crude drugs. (Observations of organoleptic analysis are tabulated in Table 2). Raw herbs were authenticated and analyzed before processing because good quality products mainly dependent upon genuine raw materials. The colour of Ghrita is muddy brown due to the presence of contents like sugarcane juice, resins, shwet chandana etc. Since the base is go-ghrita, the odour is ghee like. Taste is sweet due to the addition of sweeteners such as powdered sugar and resins. As it is a semi-solid preparation made in ghee, it is viscous and sticky. It is coarse in appearance due to the addition of coarsely powdered crude drugs. Physicochemical analysis: Results of physicochemical analysis of Dhatryadi ghrita are detailed in Table 3. Loss on drying, Specific gravity, and Refractive index, are in normal range. If Saponification value is more than normal range, it indicates lower molecular saturated fatty acids. Higher the iodine value, the less stable will be Ghrita and the more susceptible it is to oxidation and free radical production. High iodine value Ghritas are prone to oxidation and polymerization and the sample becomes rancid, which decreases the shelf life and stability of the product. If acid value is more, then chances of photo-oxidation and rancidity are more. The obtained values of these tests were found within normal limits in Dhatryadi Ghrita, which indicate good quality of product. In addition, no rancidity was found in the finished product. The refractive index was 1.243.The specific gravity of the sample was 0.851, which was closer to plain Ghrita, for which it was 0.9, showing that the sample was not too dense. The acid value was 1.5 w/v, indicating the amount of free fatty acid present in the Ghrita. The saponification value was found to be 95 w/v. It gave an idea of the molecular weight of an oil/fat, and the oil contained a long chain of fatty acids. The observed iodine value for the Ghrita was 65 w/v, which indicated the consumption of the iodine molecules by free fatty acids. Phytochemical screening (Table 4): Ghrita showed the presence of glycosides, mainly in the form of saponin glycosides as glycyrrhizin etc. from liquorice which is confirmed by the foam test. Due to presence of Amla, it gives positive test for the presence of tannins. Addition of shwet Chandan enhances the terpenoids in the formulation and also provides soothing odor to the formulation. Presence of reducing sugars is because of the presence of Iksu and Shatavari in the Ghrita. Addition of resins and sugars also contributes towards it. Traces of alkaloids as well as amino-acids is also observed while screening the formulation for the presence of phyto-constituents. Amino acids are likely due to the addition of cow milk to the Ghrita.

Fig. (2)
TLC of Ghrita.


TLC: The findings of TLC, which is mainly performed for the confirmation of the phytoconstituents present sounds similar as mentioned in the Ayurvedic Pharmacopoeia, which mentions the same solvent system in the same ratio. It shows the presence of two major components in the Ghrita, which are soluble in non-polar solvent as hexane. The selection of solvent system signifies the increased non-polarity in order to separate the constituents of Ghrita, which is a lipid based preparation. The Rf value and the colour of the spots are also approximately same. It can be assumed that it may be due to the constituent of Kushmanda fruit juic, which is used to synthesize the formulation Fig. (2).

CONCLUSION

Despite the advent of modern technology in standardization of Ayurvedic formulations, only the data on a few of them are available. With the above standardization procedures, strictly through the standard guidelines, we get substantial information for proper identification of the phytoconstituents and their types. The advancement of analytical techniques can serve as a specific tool in herbal drug research, thereby, allowing the manufacturers to set quality standards and specifications so as to seek marketing approval from regulatory authorities for therapeutic efficacy, safety and shelf- life of herbal drugs. The purpose of standardization of medicinal plants is obviously to ensure therapeutic efficacy. Therefore, maintaining the quality of these plant products is an essential factor. Pharmacognostical study findings confirm the ingredients present in the Dhatryadi Ghrita. It is inferred that the formulation meets maximum qualitative standards based on physicochemical parameters. The results of this study may be used as the reference standard in further research undertakings of its kind. As not much work has been done on the Ghrita to explore its hidden potential. Pharmacognostical and phyto-chemical evaluation of Ghrita illustrated the specific characters of ingredients which were used in the preparation. Physico-chemical profile is an important parameter for quality control and assurance. In the present work, the obtained results were found within prescribed limits. For the first time, pharmaceutical and analytical profile of Dhatryadi Ghrita was established.

On the basis of the observations and results, obtained from the above methods adopted, this study may be used as standard in the further quality control researches. Pharmacognostical study findings confirm the ingredients present in the Dhatryadi Ghrita.

ETHICAL APPROVAL AND CONSENT TO PARTICIPATE

Not applicable.

HUMAN AND ANIMAL RIGHTS

No animals/humans were used for the studies that are bases of this research.

CONSENT FOR PUBLICATION

Not applicable.

CONFLICT OF INTEREST

The authors declare that there is no conflict of interest, financial or otherwise.

ACKNOWLEDGEMENTS

Declared none.

REFERENCES

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Daniel Pesut
(Indiana University School of Nursing, USA)

"It is important that students and researchers from all over the world can have easy access to relevant, high-standard and timely scientific information. This is exactly what Open Access Journals provide and this is the reason why I support this endeavor."


Jacques Descotes
(Centre Antipoison-Centre de Pharmacovigilance, France)

"Publishing research articles is the key for future scientific progress. Open Access publishing is therefore of utmost importance for wider dissemination of information, and will help serving the best interest of the scientific community."


Patrice Talaga
(UCB S.A., Belgium)

"Open access journals are a novel concept in the medical literature. They offer accessible information to a wide variety of individuals, including physicians, medical students, clinical investigators, and the general public. They are an outstanding source of medical and scientific information."


Jeffrey M. Weinberg
(St. Luke's-Roosevelt Hospital Center, USA)

"Open access journals are extremely useful for graduate students, investigators and all other interested persons to read important scientific articles and subscribe scientific journals. Indeed, the research articles span a wide range of area and of high quality. This is specially a must for researchers belonging to institutions with limited library facility and funding to subscribe scientific journals."


Debomoy K. Lahiri
(Indiana University School of Medicine, USA)

"Open access journals represent a major break-through in publishing. They provide easy access to the latest research on a wide variety of issues. Relevant and timely articles are made available in a fraction of the time taken by more conventional publishers. Articles are of uniformly high quality and written by the world's leading authorities."


Robert Looney
(Naval Postgraduate School, USA)

"Open access journals have transformed the way scientific data is published and disseminated: particularly, whilst ensuring a high quality standard and transparency in the editorial process, they have increased the access to the scientific literature by those researchers that have limited library support or that are working on small budgets."


Richard Reithinger
(Westat, USA)

"Not only do open access journals greatly improve the access to high quality information for scientists in the developing world, it also provides extra exposure for our papers."


J. Ferwerda
(University of Oxford, UK)

"Open Access 'Chemistry' Journals allow the dissemination of knowledge at your finger tips without paying for the scientific content."


Sean L. Kitson
(Almac Sciences, Northern Ireland)

"In principle, all scientific journals should have open access, as should be science itself. Open access journals are very helpful for students, researchers and the general public including people from institutions which do not have library or cannot afford to subscribe scientific journals. The articles are high standard and cover a wide area."


Hubert Wolterbeek
(Delft University of Technology, The Netherlands)

"The widest possible diffusion of information is critical for the advancement of science. In this perspective, open access journals are instrumental in fostering researches and achievements."


Alessandro Laviano
(Sapienza - University of Rome, Italy)

"Open access journals are very useful for all scientists as they can have quick information in the different fields of science."


Philippe Hernigou
(Paris University, France)

"There are many scientists who can not afford the rather expensive subscriptions to scientific journals. Open access journals offer a good alternative for free access to good quality scientific information."


Fidel Toldrá
(Instituto de Agroquimica y Tecnologia de Alimentos, Spain)

"Open access journals have become a fundamental tool for students, researchers, patients and the general public. Many people from institutions which do not have library or cannot afford to subscribe scientific journals benefit of them on a daily basis. The articles are among the best and cover most scientific areas."


M. Bendandi
(University Clinic of Navarre, Spain)

"These journals provide researchers with a platform for rapid, open access scientific communication. The articles are of high quality and broad scope."


Peter Chiba
(University of Vienna, Austria)

"Open access journals are probably one of the most important contributions to promote and diffuse science worldwide."


Jaime Sampaio
(University of Trás-os-Montes e Alto Douro, Portugal)

"Open access journals make up a new and rather revolutionary way to scientific publication. This option opens several quite interesting possibilities to disseminate openly and freely new knowledge and even to facilitate interpersonal communication among scientists."


Eduardo A. Castro
(INIFTA, Argentina)

"Open access journals are freely available online throughout the world, for you to read, download, copy, distribute, and use. The articles published in the open access journals are high quality and cover a wide range of fields."


Kenji Hashimoto
(Chiba University, Japan)

"Open Access journals offer an innovative and efficient way of publication for academics and professionals in a wide range of disciplines. The papers published are of high quality after rigorous peer review and they are Indexed in: major international databases. I read Open Access journals to keep abreast of the recent development in my field of study."


Daniel Shek
(Chinese University of Hong Kong, Hong Kong)

"It is a modern trend for publishers to establish open access journals. Researchers, faculty members, and students will be greatly benefited by the new journals of Bentham Science Publishers Ltd. in this category."


Jih Ru Hwu
(National Central University, Taiwan)


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