Tailaparnah consists of mature leaf of Eucalyptus globulus Labill. (Fam. Myrtacem) a large tree attaining a height of 90 m or more, native to Australia, but planted world wide and introduced in Nilgiris, Anamalai and Palni hills, Simla and Shillong at an altitude of 1500-2500 m.
Sanskrit : Nilaniryasa, Ekalipth, Sugandha Patrah
Assamese : —
Bengali : —
English : Blue gum, Eucalyptus
Gujrati : —
Hindi : Yukeliptas
Kannada : —
Kashmiri : —
Malayalam : Yukkaalimaram
Marathi : Nilgiri
Oriya : —
Punjabi : —
Tamil : Yukkaalimaram
Telugu : Jeevakamu
Urdu : —
Drug consists of mature leaves, more or less scimitar shaped, thick, leathery, greyish-green, petiolate, upto 26 cm long and 4 cm broad; petioles 2.0 to 3.5 cm long and 0.5 to 1.5 mm thick, sometimes twisted; apex acute to acuminate, base obtuse; midrib prominent, particularly on the lower surface; margin of leaf entire and somewhat thickened, brittle and possess numerous brown to dark brown corky warts. In transmitted light, numerous oil glands can be seen as transluscent dots; upper surface smooth, lower surface slightly rough due to the presence of projecting veins; venation – unicostate reticulate; lateral veins anastamose near the margin forming a continuous line; odour strong and characteristic.
Leaf – T.S. shows typical isobilateral structures with two or three rows of palisade cells on both upper and lower sides, surfaces show thick cuticle; numerous sunken stomata and large ovoid schizogenous oil cavities of 160 to 200 n diam.; idioblasts present with rosettes or prismatic calcium oxalate crystals; rosette crystals 25 to 35n in size, prismatic crystals 15 to 25n in size; vascular bundle of midrib are crescent shaped with one vascular strand present on each side, all having interrupted patches of sclerenchyma; corky warts comprising of 10 or more layers of cells; laminary bundles enclosed in bundle sheath, the cells of which extend to the epidermis on both sides; upper and lower epidermal cells have straight walls; stomata anomocytic; stomatal index on both upper and lower surface 5 to 10; the palisade ratio on upper surface 5 to 17 and lower surface 3 to 6.
Powder – Yellowish brown, free flowing, characterized by the presence of cluster and prismatic crystals of calcium oxalate; epidermis straight walled with sunken stomata; fibers present.
IDENTITY, PURITY AND STRENGTH
Foreign matter Not more than 1 per cent, Appendix 2.2.2.
Total Ash Not more than 9 per cent, Appendix 2.2.3.
Acid-insoluble ash Not more than 1 per cent, Appendix 2.2.4.
Alcohol-soluble extractive Not less than 14 per cent, Appendix 2.2.6.
Water-soluble extractive Not less than 21 per cent, Appendix 2.2.7.
Essential oil Not less than 2 per cent, Appendix 2.2.10
T.L.C. of hexane extract on silica gel 60 F 254 plate using Toluene : Acetone (95:05) shows four spots at Rf 0.22, 0.35, 0.41 and 0.49 on spraying with Vanillin- Sulphuric acid reagent and heating the plate for 15 minutes at 110oC.
CONSTITUENTS – Essential oil containing terpenes such as 1,8 – cineole, camphene, sabinene, myrcene, p-menthone, α-and γ-terpinene, fenchone, α- β- thujone, citral, verbenone.
PROPERTIES AND ACTION
Rasa : Katu, Tikta, Kasaya
Guna : Laghu, Snigdha
Virya : Usna
Vipaka : Katu
Karma : Dipana, Hrdya, Kaphahara, Mutrala, Pacana, Vatahara, Durgandhinasaka, Agnimandya, Balaprada
IMPORTANT FORMULATIONS – Ekadasasatikaprasanini Failam, Mahasugandhika Taila, Pancavaktra Rasa, Pancaguna Taila, Martandabhairava Rasa, Jvaramari Rasa
THERAPEUTIC USES – Sula, Agnimandya, Svasa, Hrdroga, Jvara, Krmi, Ksaya, Puyameha, Pliharoga, Pratisyaya, Pravahika, Svarabheda, Visamajvara, Jirnakasa, Bastiroga
DOSE – 1-2 g.