Charak Samhita

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{{#seo:
{{#seo:
|title=Charak Samhita
|title=Charak Samhita
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== Current Researches ==
== Current Researches ==
=== Phytochemical Composition ===
=== Phytochemical Composition ===
The root matrix of ''Vetiveria zizanioides'' yields a heavy, viscous, amber-brown essential oil (0.3%–1.5%) comprising uniquely functionalized sesquiterpene derivatives:
The root oil of ''Vetiveria zizanioides'' is a complex mixture dominated by sesquiterpenes, and its composition varies with genotype, geographical origin and extraction method.
* '''Sesquiterpene Alcohols:''' Khusimol, vetiverols (α- and β-vetiverol), isovalencenol, and epizizanal.
* '''Sesquiterpene Alcohols and Ketones:''' Khusimol was the major component (12.86%) of a Brazilian root oil,<ref name="Barros2009" /> and vetiverols and vetivones are characteristic constituents reported in vetiver oils.<ref name="Chou2012" />
* '''Sesquiterpene Hydrocarbons:''' Vetivene, &alpha;-vetivone, &beta;-vetivone, zizanol, and khusimene.
* '''Taiwanese Steam-Distilled Oil:''' Twenty-five constituents were identified, with cedr-8-en-13-ol (12.4%), α-amorphene (7.80%), β-vatirenene (5.94%) and α-gurjunene (5.91%) predominating.<ref name="Biomolecules2025" /><ref name="Chou2012" />
* '''Phenolic Acids & Flavonoids:''' Caffeic acid, p-coumaric acid, gallic acid, ferulic acid, and luteolin derivatives.
* '''Chemotype Variation:''' Root oil from Giresun, Turkey was dominated by isobutyl angelate (11.15%), α-muurolene (10.56%), α-cedrene (8.42%), α-patchoulene (8.10%) and ethylene brassylate (7.49%), showing marked variation with origin and the need for standardisation.<ref name="Efe2021" />
* '''Secondary Biomolecules:''' Zizanoic acid, isovalencic acid, and &beta;-sitosterol.
* '''Phenolic Acids:''' Soluble, glycoside-bound and wall-bound phenolic acids have been quantified by HPLC in the plant.<ref name="JPharmaceutics2013" />


=== Pharmacological Activities & Therapeutic Efficacy ===
=== Pharmacological Activities & Therapeutic Efficacy ===
Most studies are in vitro or in animals, and many use essential oil, which differs from the traditional root preparations (''Churna'', ''Hima'', ''Kwatha''). Controlled clinical trials are lacking.<ref name="Biomolecules2025" />


==== Antipyretic & Thermoregulatory Activity ====
==== Antipyretic & Thermoregulatory Activity ====
Usheera's classical reputation as a potent febrifuge (''Jwaraghna'') is well documented pharmacologically.
Usheera's classical reputation as a febrifuge (''Jwaraghna'') has a preclinical correlate.
* '''Mechanism:''' Bioactive fractions down-regulate pyrogenic cytokine release, reducing interleukin-1&beta; (IL-1&beta;), tumor necrosis factor-&alpha; (TNF-&alpha;), and hypothalamic prostaglandin E2 ($PGE_2$) synthesis.
* '''Scientific Evidence:''' In yeast-induced pyrexia in albino rats, hexane and methanol extracts of the root (75, 150 and 300 mg/kg) significantly reduced the elevated rectal temperature in a dose-dependent manner. The effect was comparable to paracetamol (150 mg/kg, p.o.).<ref name="Narkhede2012" />
* '''Scientific Evidence:''' In yeast-induced hyperpyrexia experimental models, root extracts (250–500 mg/kg p.o.) produced significant, sustained reductions in rectal temperatures comparable to standard paracetamol, validating its classical role in acute fevers.<ref name="Rehmani">{{cite journal |last1=Rehmani |first1=R. |last2=Ahmad |first2=S. |last3=Khan |first3=M. |year=2014 |title=Antipyretic and analgesic activities of ethanolic extract of Vetiveria zizanioides root |journal=Journal of Pharmacy Research |volume=8 |issue=6 |pages=789–793}}</ref>
* '''Limitation:''' This is a single rodent study. The mechanism was not established, and the finding has not been replicated in humans.


==== Free Radical Scavenging & Cytoprotective Actions ====
==== Free Radical Scavenging & Cytoprotective Actions ====
* '''Mechanism:''' Sesquiterpenes and polyphenols donate electrons to quench free radicals, replenish endogenous superoxide dismutase (SOD) and catalase (CAT), and reduce microsomal lipid peroxidation.
* '''Scientific Evidence:''' Ethanolic root extracts of two genotypes (KS1 and Gulabi) showed ferric-reducing (FRAP) and DPPH free-radical scavenging activity that increased with concentration (10–1000 µg/mL). At 100 µg/mL the KS1 extract also protected erythrocyte reduced glutathione (GSH) and limited malondialdehyde (MDA) formation under t-BHP and H<sub>2</sub>O<sub>2</sub> induced oxidative stress.<ref name="Luqman2009" />
* '''Scientific Evidence:''' Ethanolic root extracts demonstrated remarkable in vitro ferric-reducing antioxidant power (FRAP) and DPPH free-radical scavenging indices ($IC_{50}$ values below 40 &mu;g/ml), effectively protecting cell membranes against oxidative injury.<ref name="Luqman">{{cite journal |last1=Luqman |first1=S. |last2=Srivastava |first2=R. |last3=Kumar |first3=R. |last4=Maurya |first4=A. K. |last5=Chanda |first5=D. |year=2009 |title=Experimental assessment of Carissa carandas and Vetiveria zizanioides essential oils for antioxidant and antibacterial activities |journal=Evidence-Based Complementary and Alternative Medicine |volume=2012 |pages=1–9 |doi=10.1155/2012/263852}}</ref>
* '''Active Constituents:''' Activity-guided work on vetiver oil has identified individual antioxidant constituents.<ref name="Kim2005" />
* '''Interpretation:''' Oxidative stress is implicated in inflammatory and Pitta-type disorders, which gives a plausible link to the ''Dahaprashamana'' action. No clinical effect on burning sensation has been demonstrated.


==== Anti-Inflammatory, Analgesic & Styptic Efficacy ====
==== Anti-Inflammatory & Analgesic Efficacy ====
* '''Mechanism:''' Vetivone isomers and khusimol competitively attenuate cyclooxygenase (COX-2) and 5-lipoxygenase (5-LOX) catalytic sites, suppressing leukotriene and prostaglandin production.
* '''Cell Culture:''' Vetiver root oil suppressed inflammatory responses in lipopolysaccharide-stimulated RAW 264.7 macrophages. It upregulated heme oxygenase-1 (HO-1) mRNA, suppressed interferon-β transcription and lowered lipid peroxidation, indicating an interplay of antioxidant and anti-inflammatory effects.<ref name="Chou2012" />
* '''Scientific Evidence:''' In carrageenan- and formalin-induced edema assays, oral root extracts demonstrated up to 61.4% inhibition of paw swelling. Its astringent tannin content also accelerates in vitro and ex vivo thromboplastin-mediated blood coagulation, corroborating its traditional styptic (''Stambhana'') use in hemorrhagic conditions.<ref name="Kumar">{{cite journal |last1=Kumar |first1=A. |last2=Tripathi |first2=M. |last3=Puri |first3=S. |year=2012 |title=Evaluation of anti-inflammatory and analgesic activities of Vetiveria zizanioides root extract in animal models |journal=Pharmaceutical Biology |volume=50 |issue=9 |pages=1121–1126 |doi=10.3109/13880209.2012.658477}}</ref>
* '''Animal Models:''' ''Chrysopogon zizanioides'' essential oil showed antinociceptive and anti-inflammatory effects in rodents.<ref name="Lima2012" />
* '''Protein Denaturation Assay:''' An ethanolic root extract inhibited albumin denaturation in vitro (IC<sub>50</sub> 157.63 ± 4.89 µg/ml).<ref name="Phuong2024" />
* '''Interpretation:''' These data support the traditional use in inflammatory skin conditions (''Kushtha'', ''Visarpa'') only as a plausible basis. They do not establish clinical efficacy.


==== Antimicrobial & Topical Wound-Healing Actions ====
==== Antimicrobial Actions ====
* '''Mechanism:''' Khusimol and related sesquiterpenic fractions alter microbial cell membrane permeability, triggering ion leakage and cell lysis while stimulating microvascular endothelial growth factor (VEGF) synthesis in fibroblasts.
* '''Scientific Evidence:''' Root essential oil from Brazil inhibited ''Micrococcus roseus'' (MIC 70 µg/ml) and ''Staphylococcus aureus'' (MIC 150 µg/ml).<ref name="Barros2009" /> Turkish root oil showed antimicrobial and antioxidant activity in disc diffusion, MIC, DPPH and FRAP assays.<ref name="Efe2021" /> Oil extracted from Chinese roots was active mainly against Gram-positive bacteria, especially ''S. aureus''.<ref name="David2019" />
* '''Scientific Evidence:''' Standardized vetiver root essential oil exhibited robust minimum inhibitory concentrations (MICs) against common wound pathogens, notably ''Staphylococcus aureus'', ''Pseudomonas aeruginosa'', and dermatophytes like ''Trichophyton mentagrophytes'', showing marked re-epithelialization and collagen deposition in excision wound models.<ref name="Devi">{{cite journal |last1=Devi |first1=P. R. |last2=Rao |first2=K. V. |year=2010 |title=Antimicrobial and wound healing potential of Vetiveria zizanioides in diabetic rats |journal=International Journal of Pharmaceutical and Biomedical Research |volume=1 |issue=4 |pages=146–151}}</ref>
* '''Interpretation:''' These in vitro results are consistent with the classical ''Vrana'' indication. Wound-healing and hemostatic (''Stambhana'') effects were not demonstrated in the studies reviewed here and need in vivo confirmation.


==== Neuroprotective & Anxiolytic Properties ====
==== Anxiolytic-like Properties ====
* '''Mechanism:''' Volatile sesquiterpenes cross the blood-brain barrier to modulate gamma-aminobutyric acid type A ($GABA_A$) receptors and reduce central monoaminergic turnover in limbic regions.
* '''Scientific Evidence:''' In male Wistar rats, inhaled vetiver essential oil (2.5% w/w) produced an anxiolytic-like profile in the elevated plus-maze, as did diazepam (1 mg/kg i.p.). Both increased c-fos expression in the lateral central amygdala, suggesting altered neuronal activation as one possible mechanism.<ref name="Saiyudthong2015" />
* '''Scientific Evidence:''' In elevated plus-maze (EPM) and open-field assessments, inhaled or parenterally administered vetiver oil elicited potent anxiolytic, central-calming, and neuroprotective responses comparable to diazepam without motor coordination impairment or drug-induced dependency.<ref name="Saiyudthong">{{cite journal |last1=Saiyudthong |first1=S. |last2=Marsden |first2=C. A. |year=2015 |title=Acute effects of vetiver essential oil on anxiety-like behavior and c-Fos expression in the central nucleus of the amygdala in rats |journal=Natural Product Communications |volume=10 |issue=6 |pages=1107–1110}}</ref>
* '''Limitation:''' The study used inhaled oil in rats. Human clinical evidence is not available.


== Safety & Toxicity Profile ==
== Safety & Toxicity Profile ==
* '''Acute & Subacute Safety:''' Preclinical safety studies report that ethanolic and aqueous root extracts show no signs of behavioral toxicity, hematological disturbance, or mortality in rodents at single oral doses up to 2,000–3,000 mg/kg body weight.
* '''Acute Safety:''' In a Brazilian preclinical study, the crude ethanolic extract of the root showed no acute toxicity in rats at 2,000 mg/kg.<ref name="Barros2009" /> Chronic, reproductive and human safety data were not found.
* '''Precautions:''' Due to its pronounced cooling (''Sheeta Virya'') and Kapha-stabilizing characteristics, prolonged administration in very large quantities during cold seasons or in patients with severe, chronic Kapha-Vata respiratory congestion should be balanced with warming bio-enhancers (e.g., Sunthi or Maricha).
* '''Precautions:''' Due to its pronounced cooling (''Sheeta Virya'') and Kapha-stabilizing characteristics, prolonged administration in very large quantities during cold seasons or in patients with severe, chronic Kapha-Vata respiratory congestion should be balanced with warming bio-enhancers (e.g., Sunthi or Maricha).
== Research Gaps ==
* Randomized controlled trials for ''Jwara'', ''Daha'' and ''Trishna'' indications
* Replication of the antipyretic findings using standardised aqueous (''Hima''/''Kwatha'') preparations
* Experimental studies on the ''Stambhana'' (hemostatic) and wound-healing claims
* Chemical standardisation (HPTLC/GC-MS) of Ayurvedic preparations, given chemotype variation
* Chronic and human toxicity data


== References ==
== References ==
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<ref name="API">{{cite book |title=The Ayurvedic Pharmacopoeia of India |year=1986 |publisher=Department of Ayush, Ministry of Health and Family Welfare, Govt. of India |volume=3 |pages=99–100 |edition=Part I}}</ref>
<ref name="API">{{cite book |title=The Ayurvedic Pharmacopoeia of India |year=1986 |publisher=Department of Ayush, Ministry of Health and Family Welfare, Govt. of India |volume=3 |pages=99–100 |edition=Part I}}</ref>
<ref name="Bhavaprakash">{{cite book |last=Chunekar |first=K. C. |title=Bhavaprakash Nighantu |year=2020 |publisher=Chaukhambha Bharati Academy |pages=Karpuradi varga, verse 86 |edition=Reprint}}</ref>
<ref name="Bhavaprakash">{{cite book |last=Chunekar |first=K. C. |title=Bhavaprakash Nighantu |year=2020 |publisher=Chaukhambha Bharati Academy |pages=Karpuradi varga, verse 86 |edition=Reprint}}</ref>
<ref name="Rehmani">{{cite journal |last1=Rehmani |first1=R. |last2=Ahmad |first2=S. |last3=Khan |first3=M. |year=2014 |title=Antipyretic and analgesic activities of ethanolic extract of Vetiveria zizanioides root |journal=Journal of Pharmacy Research |volume=8 |issue=6 |pages=789–793}}</ref>
<ref name="Luqman2009">{{cite journal |last1=Luqman |first1=S. |last2=Kumar |first2=R. |last3=Kaushik |first3=S. |last4=Srivastava |first4=S. |last5=Darokar |first5=M. P. |last6=Khanuja |first6=S. P. S. |year=2009 |title=Antioxidant potential of the root of ''Vetiveria zizanioides'' (L.) Nash |journal=Indian Journal of Biochemistry and Biophysics |volume=46 |issue=1 |pages=122–125 |pmid=19374265}}</ref>
<ref name="Luqman">{{cite journal |last1=Luqman |first1=S. |last2=Srivastava |first2=R. |last3=Kumar |first3=R. |last4=Maurya |first4=A. K. |last5=Chanda |first5=D. |year=2009 |title=Experimental assessment of Carissa carandas and Vetiveria zizanioides essential oils for antioxidant and antibacterial activities |journal=Evidence-Based Complementary and Alternative Medicine |volume=2012 |pages=1–9 |doi=10.1155/2012/263852}}</ref>
<ref name="Kim2005">{{cite journal |last1=Kim |first1=H. J. |last2=Chen |first2=F. |last3=Wang |first3=X. |last4=Chung |first4=H. Y. |last5=Jin |first5=Z. |year=2005 |title=Evaluation of antioxidant activity of vetiver (''Vetiveria zizanioides'' L.) oil and identification of its antioxidant constituents |journal=Journal of Agricultural and Food Chemistry |volume=53 |issue=20 |pages=7691–7695}}</ref>
<ref name="Kumar">{{cite journal |last1=Kumar |first1=A. |last2=Tripathi |first2=M. |last3=Puri |first3=S. |year=2012 |title=Evaluation of anti-inflammatory and analgesic activities of Vetiveria zizanioides root extract in animal models |journal=Pharmaceutical Biology |volume=50 |issue=9 |pages=1121–1126 |doi=10.3109/13880209.2012.658477}}</ref>
<ref name="Chou2012">{{cite journal |last1=Chou |first1=S. T. |last2=Lai |first2=C. P. |last3=Lin |first3=C. C. |last4=Shih |first4=Y. |year=2012 |title=Study of the chemical composition, antioxidant activity and anti-inflammatory activity of essential oil from ''Vetiveria zizanioides'' |journal=Food Chemistry |volume=134 |issue=1 |pages=262–268 |doi=10.1016/j.foodchem.2012.02.131}}</ref>
<ref name="Devi">{{cite journal |last1=Devi |first1=P. R. |last2=Rao |first2=K. V. |year=2010 |title=Antimicrobial and wound healing potential of Vetiveria zizanioides in diabetic rats |journal=International Journal of Pharmaceutical and Biomedical Research |volume=1 |issue=4 |pages=146–151}}</ref>
<ref name="Lima2012">{{cite journal |last1=Lima |first1=G. M. |last2=Quintans-Júnior |first2=L. J. |last3=Thomazzi |first3=S. M. |display-authors=etal |year=2012 |title=Phytochemical screening, antinociceptive and anti-inflammatory activities of ''Chrysopogon zizanioides'' essential oil |journal=Revista Brasileira de Farmacognosia |volume=22 |issue=2 |pages=443–450 |doi=10.1590/S0102-695X2012005000005}}</ref>
<ref name="Saiyudthong">{{cite journal |last1=Saiyudthong |first1=S. |last2=Marsden |first2=C. A. |year=2015 |title=Acute effects of vetiver essential oil on anxiety-like behavior and c-Fos expression in the central nucleus of the amygdala in rats |journal=Natural Product Communications |volume=10 |issue=6 |pages=1107–1110}}</ref>
<ref name="Phuong2024">{{cite journal |last1=Phuong |first1=M. H. |last2=Linh |first2=L. K. K. |year=2024 |title=Evaluation of the anti-inflammatory activity of vetiver root extract in Dak Lak, Viet Nam |url=https://vjol.vista.gov.vn/sphcm/en/article/view/105430}}</ref>
<ref name="Narkhede2012">{{cite journal |last1=Narkhede |first1=M. B. |last2=Ajmire |first2=P. V. |last3=Wagh |first3=A. E. |last4=Bhise |first4=M. R. |last5=Mehetre |first5=G. D. |last6=Patil |first6=H. J. |year=2012 |title=An evaluation of anti-pyretic potential of ''Vetiveria zizanioides'' (Linn.) root |journal=Research Journal of Pharmacology and Pharmacodynamics |volume=4 |issue=1 |pages=11–13}}</ref>
<ref name="Barros2009">{{cite thesis |last=Barros |first=G. C. |year=2009 |title=Estudo fitoquímico e avaliações da toxicidade aguda e atividades biológicas da raiz do vetiver (''Vetiveria zizanioides'' L. Nash) Poaceae |publisher=Universidade Federal de Goiás |url=https://repositorio.bc.ufg.br/tede/items/cc047cde-a52f-4ad2-b2f5-bdeb4002ba8b}}</ref>
<ref name="Efe2021">{{cite journal |last1=Efe |first1=D. |last2=Karaköse |first2=M. |last3=Aktaş Karaçelik |first3=A. |last4=Ertan |first4=B. |year=2021 |title=GC-MS analyses and bioactivities of essential oil obtained from the roots of ''Chrysopogon zizanioides'' (L.) Roberty cultivated in Giresun, Turkey |journal=Turkish Journal of Chemistry |volume=45 |issue=5 |doi=10.3906/kim-2009-64}}</ref>
<ref name="David2019">{{cite journal |last1=David |first1=A. |last2=Wang |first2=F. |last3=Sun |first3=X. |last4=Li |first4=H. |last5=Lin |first5=J. |display-authors=etal |year=2019 |title=Chemical composition, antioxidant, and antimicrobial activities of ''Vetiveria zizanioides'' (L.) Nash essential oil extracted by carbon dioxide expanded ethanol |journal=Molecules |volume=24 |issue=10 |page=1897 |doi=10.3390/molecules24101897}}</ref>
<ref name="Saiyudthong2015">{{cite journal |last1=Saiyudthong |first1=S. |last2=Pongmayteegul |first2=S. |last3=Marsden |first3=C. A. |last4=Phansuwan-Pujito |first4=P. |year=2015 |title=Anxiety-like behaviour and c-fos expression in rats that inhaled vetiver essential oil |journal=Natural Product Research |volume=29 |issue=22 |pages=2141–2144 |doi=10.1080/14786419.2014.992342}}</ref>
<ref name="JPharmaceutics2013">{{cite journal |year=2013 |title=HPLC quantification of phenolic acids from ''Vetiveria zizanioides'' (L.) Nash and its antioxidant and antimicrobial activity |journal=Journal of Pharmaceutics |volume=2013 |page=270472 |doi=10.1155/2013/270472}}</ref>
<ref name="Biomolecules2025">{{cite journal |year=2025 |title=Pharmacological and therapeutic potential of ''Chrysopogon zizanioides'' (vetiver): a comprehensive review of its medicinal applications and future prospects |journal=Biomolecules |volume=15 |issue=9 |page=1312 |doi=10.3390/biom15091312}}</ref>
}}
}}
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