http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/162 Assistant Professor, Bawngkawn, Aizawl 2026-04-29T12:23:37Z 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/123456789/539 Title: Antioxidant Property and Free Radical Scavenging Activity of Hedyotis scandens (Roxb). Rubiaceae Authors: Ralte, Vanlalhruaii Abstract: Hedyotis scandens Roxb is a common medicinal plant locally utilised for the treatment of diseases in many communities, especially in Mizoram. However, scientific evidence for its therapeutic properties is quite poor and no scientific validation is available of its antioxidant capacity, as per our knowledge. Therefore, the present study aims to investigate the phytochemical constituents and therapeutic potential of the aqueous leaf extract of Hedyotis scandens Roxb. Free radical scavenging activity was determined in a cell free system. The aqueous leaf extract of Hedyotis scandens inhibited the generation of ABTS 2, 2’- azinobis-( 3-ethylbenzothiazoline-6-sulfonic acid), DPPH (1, 1-diphenyl-2-picrylhydrazyl) and nitric oxide in a concentration dependent manner. The IC50 for DPPH was found to be 68.03 ± 0.15 μg/ml, IC50 for ABTS was 53.165 ± 0.3 μg/ml and the IC50 for Nitric oxide scavenging activity was found to be 173.15 ± 0.25μg/ml. Phytochemical analysis of the plant extract revealed the presence of 23.67 ± 0.003 GAE mg/g of Total Phenolic Content and 27.44 ± 0.28 QE mg/g of Total Flavonoid Content. The total antioxidant activity of the plant extract when compared to standard Ascorbic acid was found to be 51.11 ± 1.03 AE mg/g. The reducing power assay showed concentration dependent activity against potassium ferricyanide. 2022-01-01T00:00:00Z