Cyte Health Dictionary

Linn.

Family: Ginkgoaceae.

Habitat: Native to China and Japan; cultivated in Indian gardens as an ornamental.

English: Maidenhair tree called Living Fossils (in India), Kew tree.

Action: Antagonizes bronchospasm, used as a circulatory stimulant, peripheral vasodilator.

Key application: Standardized dry extract—for symptomatic treatment of disturbed performance in organic brain syndrome within the regimen ofa therapeutic concept in cases of dementia syndromes— memory deficits, disturbance in concentration, depressive emotional conditions, dizziness, tinnitus and headache. (German Commission E, ESCOP, WHO.) As vasoactive and platelet aggregation inhibitor.

(The British Herbal Pharmacopoeia.) (For pharmocological studies in humans and clinical studies, see ESCOP.)

The majority of pharmacological studies and clinical trials have been conduced using a standardized extract which contains 24% flavonoid glyco- sides (Ginko flavone glycosides) and 6% terpenoids (ginkgolides and bilob- alide).

The extract increases tolerance to hypoxia and exhibits anti-ischaemic effect. It simultaneously improves the fluidity of blood, decreases platelet adhesion, decreases platelet and erythro- cyte aggregation and reduces plasma and blood viscosity. The extract protects erythrocytes from haemolysis. The extract also decreases the permeability of capillaries and protects the cell membrane by trapping deleterious free radicals.

The extract also increased cerebral blood flow in about 70% patients evaluated (patients between 30-50 year age had 20% increase from the base line, compared with 70% in those 50- to 70- year-olds).

A reversal of sexual dysfunction with concurrent use of ginkgo with antidepressant drugs has been reported. (Am J Psychiatry, 2000 157(5), 836837.)

The National Centre for Complementary and Alternative Medicine, USA, is conducting a 5-year study of 3000 people aged 75 and older to determine if ginkgo, 240 mg daily, prevents dementia or Alzheimer's disease.... ginkgo biloba

(Linn.) Lam.

Habitat: Native to tropical America; cultivated throughout India for edible tubers.

English: Sweet potato.

Ayurvedic: Mukhaaluka, Rataalu, Raktaalu, Raktapindaka, Raktakan- da.

Siddha/Tamil: Sakkareivelleikulan- gu.

Unani: Shakarkand, Rataalu.

Action: Root—used in strangury, urinary discharges, burning sensation, thirst. Whole plant—used in low fever and skin diseases.

Cooked tubers contain reducing sugars 6.45, sucrose 2.23, maltose 864, dextrins 0.51 and polysaccharides 14-13%. Cooking increases the sweetness as a result of the hydrolysis of starch to maltose and dextrins through the action of beta-amylase.

Sweet potatoes are rich in starch content. During the storage a part of starch content is converted into reducing sugars and subsequently into sucrose. In a sample stored for 5 months, the starch content was reduced from 19.1% to 14.1% while the percentage of reducing sugars (as dextrose) and sucrose increased from 0.9 to 1.7 and 1.9 to 6.1% respectively.

Indian types with white flesh contain little or no carotene, while American types with pink flesh contain as high as 5.4-7.2 mg/100 g of carotene. Vitamins present in the tubers are : thiamine 0.09-0.14, riboflavin 0.05-0.10 and vitamin C 16-22 mg/100 g.

The hot aqueous extract of leaves exhibits significant inhibitory activity of rat lens aldose reductase (AR). Ellagic and 3,5-dicaffoylquinic acids have been isolated as potent inhibitors.

The leaves also contain polysaccha- rides which increase the platelet count in experimental animals due to enhanced production ofthrombopoietin.

From the stem and root, hexadecyl, octadecyl and eicosyl p-coumarates have been isolated.

The tubers show significant lectin activity and exhibit haemagglutinating activity in trypsinized rabbit erythro- cytes.... ipomoea batatas