Kakali Saha

Screening of anti-diarrhoeal profile of some plant extracts of a specific region of West Bengal India.

Ethanol extract of four different plants of the Khatra region of the Bankura district of West Bengal, India were evaluated for anti-diarrhoeal activity against different experimental models of diarrhoea in rats. The extracts of Ficus bengalensis Linn. (hanging roots), Eugenia jambolana Lam. (bark), Ficus racemosa Linn. (bark) and Leucas lavandulaefolia Rees (aerial parts) showed significant inhibitory activity against castor oil induced diarrhoea and PGE2 induced enteropooling in rats. These extracts also showed a significant reduction in gastrointestinal motility in charcoal meal tests in rats. The results obtained establish the efficacy of all these plant materials as anti-diarrhoeal agents.

Effect of Nelumbo nucifera rhizome extract on blood sugar level in rats

Oral administration of the ethanolic extract of rhizomes of Nelumbo nucifera markedly reduced the blood sugar level of normal, glucose-fed hyperglycemic and streptozotocin-induced diabetic rats, when compared with control animals. The extract improved glucose tolerance and potentiated the action of exogenously injected insulin in normal rats. When compared with tolbutamide, the extract exhibited activity of 73 and 67% of that of tolbutamide in normal and diabetic rats, respectively.

Wound healing activity of Leucas lavandulaefolia Rees

Leucas lavandulaefolia Rees (Labiatae), commonly known as Halkusha, is a well-known plant in Indian traditional medicine. On the basis of its traditional use and literature references, this plant was selected for evaluation of its wound healing potential. A methanol extract of L. lavandulaefolia was examined for its wound healing activity both in the form of an ointment as well as an injection in two types of wound model in rats: (i) the excision wound model and (ii) the incision wound model. Both the injection and the ointment of the methanol extract of the plant material produced a significant response in both of the wound types tested. The results were also comparable to those of a standard drug, nitrofurazone, in terms of wound contracting ability, wound closure time, tensile strength and regeneration of tissues at the wound site.

Studies on psychopharmacological effects of Nelumbo nucifera Gaertn. rhizome extract

Methanolic extract of rhizomes of Nelumbo nucifera (NNRE) was investigated for different psychopharmacological actions in rats and mice. The extract was found to cause reduction in spontaneous activity, decrease in exploratory behavioural pattern by the head dip and Y-maze test, reduction in muscle relaxant activity by rotarod, 30 degrees inclined screen and traction test and potentiated the pentobarbitone induced sleeping time in mice significantly.

Studies on antiinflammatory effect of Cassia tora leaf extract (fam. Leguminosae)

The antiinflammatory effect of the methanol extract of the leaves of Cassia tora was investigated against carrageenin, histamine, serotonin and dextran‐induced rat hind paw oedema. It exhibited significant antiinflammatory activity against all these agents. The extract (400 mg/kg) showed maximum inhibition of oedema of 40.33%, 31.37%, 53.57% and 29.15% at the end of 3 h with carrageenin, dextran, histamine and serotonin‐induced rat paw oedema, respectively. Using a chronic test, the granuloma pouch in rats, the extract exhibited a 48.13% reduction in granuloma weight.

Diuretic Activity of Extract of the Rhizomes of Nelumbo nucifera Gaertn. (Fam. Nymphaeaceae)

The diuretic efficacy of the rhizomes of Nelumbo nucifera was studied on albino rats. The methanol extract of the rhizomes induced significant diuresis in rats. Dose dependent effects were observed in urine volume and electrolyte excretion. There was a significant increase in natriuretic and chloruretic activity but kaliuresis was less than natriuresis.

Studies on in vivo antitussive activity of Leucas lavandulaefolia using a cough model induced by sulfur dioxide gas in mice

The methanol extract of Leucas lavandulaefolia was investigated for its effects on a cough model induced by sulfur dioxide gas in mice. It exhibited significant antitussive activity when compared with control in a dose-dependent manner. The antitussive activity of the extract was comparable to that of codeine phosphate (10 mg/kg), a prototype antitussive agent. The Leucas lavandulaefolia extract at 100, 200, and 400 mg/kg. p.o. showed inhibition of cough by 35.0, 51.9, and 56.5% within 1 h of performing the experiment.

Studies on Some Psychopharmacological Actions of Moringa oleifera Lam. (Moringaceae) Leaf Extract

The methanol extract of the leaves of Moringa oleifera Lam. was investigated for some psychopharmacological actions in animals. The extract was found to produce a significant alteration in general behavioural pattern by head dip test, Y‐maze test, evasion test, and reduction in muscle relaxant activity by rotarod test, chimney test and traction test. Beside these, the extract also potentiated pentobarbitone induced sleeping time and lowered body temperature in experimental animals.

Studies on antitussive activity of Drymaria cordata Willd. (Caryophyllaceae)

The methanol extract of Drymaria cordata Willd. was investigated for its effect on a cough model induced by sulfur dioxide gas in mice. It exhibited significant antitussive activity when compared with the control in a dose-dependent manner. The antitussive activity of the extract was comparable to that of codeine phosphate, a prototype antitussive agent. The D. cordata extract (100, 200, 400 mg/kg) showed 11.6%, 31.6% and 51.5% inhibition of cough with respect to the control group.

Hypoglycaemic activity of Leucas lavandulaefolia Rees. in streptozotocin‐induced diabetic rats

The antidiabetic activity of Leucas lavandulaefolia Rees (Family ‐ Labiatae) extract on streptozotocin (STZ) induced diabetic rats has been investigated. A methanol extract of the herb at doses of 200 and 400 mg/kg, and glybenclamide (1 mg/kg) were administered concurrently to STZ‐diabetic rats. The extract caused a significant reduction of blood glucose levels in streptozotocin‐induced diabetic rats by 29.8% (p <0.001) compared with control groups.