http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/535 2025-10-30T08:36:03Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/542 Title: Determination of total phenolic content, total flavonoid content and total antioxidant capacity of Ageratina adenophora Authors: Ralte, Vanlalhruaii Abstract: Petroleum ether, chloroform and methanol extracts of Ageratina adenophora leaves were screened for assessing bioactive phytochemical constituents. The preliminary phytochemical screening using the standard phytochemical tests detected the presence of alkaloids, steroids, flavonoids, reducing sugars, tannins, saponins, terpenoids, anthraquinones, cardiac glycosides and phenols in different solvent extracts. Total phenolic and flavonoid contents along with total antioxidant capacity of the polar methanolic extract of A. adenophora leaves were evaluated to explore the reliable and poten-tial sources of novel natural antioxidants. The methanol extract leaves revealed a total phenolic content of 30.0 mg gallic acid equivalent/g and 510.0 mg quercetin equivalent/g. The total antioxi-dant capacity ranges from 16.98 to 94.87% of standard ascorbic acid at concentrations ranging from 0.05 to 1 mg/ml of the plant extract in methanol. 2013-10-13T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/541 Title: Effect of coal mining on soil physico-chemical properties of Nokrek Biosphere Reserve of Meghalaya, northeastern India Authors: Ralte, Vanlalhruaii Abstract: Mining causes massive damage to landscape and biological components of an ecosystem. Due to extensive and unmanaged coal mining in the southern part of Nokrek Biosphere Reserve of Meghalaya, the area has been turned into degraded land since nutrient deficient sandy spoils are hostile for the growth and regeneration of plant communities. Soil is sandy to sandy loam and red, brown to dark brown in colour. The physico-chemical properties of the soil were greatly affected due to coal mining. There is an increased acidity i.e. from 6.00 in the undisturbed forest (control site) to 3.50 in the coal mine spoil since abandoned mine spoil discharge acidic water that are enriched with iron and other metals and metalloids. Apart from this, soil nutrients are greatly depleted. The core zone soils are rich in organic matter and nutrients whereas coalmine spoils show sign of degradation especially in the nutrient content. 2017-11-01T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/540 Title: In vitro antioxidant activity of Ageratina adenophora (King & Rob) and Ipomoea cairica (L) Sweet Authors: Ralte, Vanlalhruaii Abstract: In this study, the in vitro antioxidant activity of the methanolic extracts of leaves and flowers of Ipomoea cairica and leaves of Ageratina adenophora were determined by spectrophotometric method. Antioxidant activity of extracts were expressed as percentage of DPPH radicals inhibition and IC50 values (μg/ml). Values in percentage ranged from 2.70 % for 0.0005 mg/ml concentration of I. cairica leaves to 93.24% for 0.05 mg/ml concentration of I.cairica flowers. The largest capacity to neutralize DPPH radicals was found for methanolic extract of I.cairica flowers which neutralized 50% of free radicals at the concentration of 1.00 μg/ml. I. cairica can be regarded as promising candidates for natural plant sources of antioxidants with high value. 2014-01-01T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/538 Title: Evaluation of phytochemical contents of Ipomoea cairica (L) Sweet – a qualitative approach Authors: Ralte, Vanlalhruaii Abstract: Phytochemical screening was performed on leaves and flower extracts of Ipomoea cairica obtained from Aizawl, Mizoram. To analyse the bioactive compounds, Pet. ether, CHCl3 and CH3OH extracts of the selected plants were tested by following standard procedures. The results demonstrated the presence of alkaloids, sterols, flavonoids, reducing sugars, tannins, saponins, terpenoids, an-thraquinones, glycosides and phenols. These results were compared with literature values. Indica-tions from the results depicted usefulness of the plant parts in the treatment of some common diseases. 2014-08-30T00:00:00Z