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Author: search.filters.author.Raja, SelvarajuStart date: 2020

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    LARVICIDAL ACTIVITY OF DIFFERENT SOLVENT EXTRACTS OF NERIUM OLEANDER (APOCYNACEAE) RED COLOURED FLOWERS AGAINST AEDES AEGYPTI, ANOPHELES STEPHENSI AND CULEX QUINQUEFASCIATUS (DIPTERA: CULICIDAE)
    (2022-03-05) Pandeeswari M; Raja, Selvaraju; Yamuna R; Manu Thomas, Mathai
    Larvicidal activity of various solvent extracts of Nerium oleander red colored flower was studied against third instar larvae of three important vector mosquitoes viz., Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus. Preliminary phytochemical analysis was done to all the solvent extracts showed the presence of Tannins, saponins, flavonoids, quinones, terpenes, phenols and coumarines are present in the red colour flowers extracts. Among the solvent extracts acetone extract was most effective when compared to other extracts. Cx. quinquefasciatus was the most susceptible (LC50=20.4 mg/L) and An. stephensi was the most tolerant (LC50=34.0 mg/L). Also, the extract was subjected to GC-MS analysis and 16 major biochemicals were detected. The present study clearly indicated that bioactive molecules present in the acetone extract of red color flower of N. oleander are promising botanical pesticide against vector mosquitoes.
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    PRELIMINARY STUDIES ON ANTIOXIDANT ACTIVITY OF EXTRACT OBTAINED FROM BLACK CARTENTER ANT CAMPONOTUS COMPRESSES (FAB.,) (HYMENOPTERA: FORMICIDAE)
    (INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN TECHNOLOGY, 2020-07) Yamuna, Ramakrishanan; Raja, Selvaraju
    Different types of toxins, debris and reactive oxygen species, commonly known as free radicals, are generated during metabolism by natural cell death, infections, pollution etc. The side effects of many drugs and medicines are also due to generation and accumulation of such free radicals. They cause many histopathological and physiological disorders leading to degenerative diseases. Thus, these wastes are to be disposed off and removed as early as possible for normal functioning of the body and healing process. In modern medical science it is believed that antioxidants, also known as free radical scavenging agents play an important role. Exogenous intake of antioxidants helps the body to scavenge free radicals effectively and to promote natural functioning of all body systems. In this present study, In vitro antioxidant activity of C. compressus extract was determined using DPPH radical scavenging method. A concentration dependent inhibition of DPPH radicals was observed with maximum activity (89.24 ± 0.005) at 4 mg/ml dose followed by other concentration tested, 3 mg/ml (79.24%), 2 mg/ml (65.48%) and 1 mg/ml (54.13%). At still higher concentration, 5 mg/ml (89.11%), a rather lower, and statistically at similarity, inhibition was noticed than the preceding concentration. The antioxidant activity of C. compressus may be due to the presence of bioactive peptides. Further detailed studies on the antioxidant activity of C. compressus extract observation on animals are needed to define the mechanism of antioxidant activity.