نتایج جستجو برای: free radical scavenging method

تعداد نتایج: 2141595  

Journal: :Biomacromolecules 2017
Eunkyoung Kim Mijeong Kang Tanya Tschirhart Mackenzie Malo Ekaterina Dadachova Gaojuan Cao Jun-Jie Yin William E Bentley Zheng Wang Gregory F Payne

Melanins are ubiquitous in nature but their biological activities and functions have been difficult to discern. Conventional approaches to determine material function start by resolving structure and then characterize relevant properties. These approaches have been less successful for melanins because of their complex structure and insolubility, and because their relevant properties are not rea...

Journal: :Memorias do Instituto Oswaldo Cruz 2007
Oscar M Mosquera Yaned M Correa Diana C Buitrago Jaime Niño

The antioxidant activity of the crude n-hexane, dichloromethane, and methanol extracts from 25 species belonging to the Asteraceae, Euphorbiaceae, Rubiaceae, and Solanaceae families collected at natural reserves from the Eje Cafetero Ecorregión Colombia, were evaluated by using the spectrophotometric 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical-scavenging method. The strongest antioxidant ...

Journal: Journal of Herbal Drugs 2011
Masoud Ranjbar Mostafa Asadbagi Parisa Hasanain Rametin Pakzad Roya Karamian,

Background & Aim: Free radicals play a crucial role in the development of tissue damage in various human diseases such as cancer, aging, neurodegenerative disease, malaria and arteriosclerosis, and pathological events in living organisms. Antioxidants may have an important role in the prevention of these diseases. The aim of this study is to evaluate potency of scavenging of DPPH free radicals ...

Journal: :Biological research 2007
Chin-Yuan Hsu Yu-Pei Chan Jeli Chang

Numerous diseases are induced by free radicals via lipid peroxidation, protein peroxidation and DNA damage. It has been known that a variety of plant extracts have antioxidant activities to scavenge free radicals. Whether Polygonum cuspidatum Sieb. et Zuce has antioxidant activity is unknown. In this study, dried roots of Polygonum cuspidatum were extracted by ethanol and the extract was lyophi...

2013
Kshitij Agarwal Santosh Verma

Free radicals are implicated for many diseases including diabetes mellitus, arthritis, cancer, ageing etc. In the treatment of these diseases, antioxidant therapy has gained a great importance. Different extract (Hot water, Hydro alcoholic, Chloroform and Petroleum Ether) of Ganoderma lucidum was studied for its in vitro antioxidant activity using different models viz. DPPH radical scavenging, ...

Journal: Journal of Herbal Drugs 2011
Masoud Ranjbar Mostafa Asadbagi Parisa Hasanain Rametin Pakzad Roya Karamian,

Background & Aim: Free radicals play a crucial role in the development of tissue damage in various human diseases such as cancer, aging, neurodegenerative disease, malaria and arteriosclerosis, and pathological events in living organisms. Antioxidants may have an important role in the prevention of these diseases. The aim of this study is to evaluate potency of scavenging of DPPH free radicals ...

Journal: :Biological research 2006
Chin-Yuan Hsu

Free radicals induce numerous diseases by lipid peroxidation, protein peroxidation, and DNA damage. It has been reported that numerous plant extracts have antioxidant activities to scavenge free radicals. Whether Polygonum aviculare L. (Polygonaceae) has antioxidant activity is unknown. In this study, dried Polygonum aviculare L. was extracted by ethanol, and the extract was lyophilized. The an...

Malaya Gupta, Palanavel Sivakumar, Rajagopal Shanmuga Sundaram, Ramalingam Nethaji, Ramanathan Sambath Kumar, Thangavel Sivakumar,

The present study was carried out to evaluate the antimicrobial and antioxidant activities of methanol extract of Careya arborea (MECA) stem barks (Myrtaceae) in various in-vitro systems. Antimicrobial activities of MECA were carried out using disc diffusion methods with Gram positive and Gram negative bacteria and some fungal species. MECA showed broad-spectrum antimicrobial activity against a...

Journal: :Indian journal of experimental biology 2007
Manish S Lavhale S H Mishra

In the present study, ethyl acetate, butanol and aqueous fractions derived from total methanol extract of Butea monosperma flowers were evaluated for radical scavenging activities using different in vitro models like reducing power assay, scavenging of 2,2 diphenyl-1-picrylhydrazyl (DPPH) radical, nitric oxide radical, superoxide anion radical, hydroxyl radical and inhibition of erythrocyte hem...

Journal: :iranian journal of pharmaceutical research 0
liang ni key laboratory of polluted environment remediation and ecological health, ministry of education, college of natural resources and environmental science, zhejiang university, hangzhou, china. wei-yong shi key laboratory of polluted environment remediation and ecological health, ministry of education, college of natural resources and environmental science, zhejiang university, hangzhou, china.

in this study, we measured the composition and free radical scavenging activity of several species of nuts, namely, torreya grandis, carya cathayensis,and myrica rubra. the nut kernels of the aforementioned species are rich in fatty acids, particularly in unsaturated fatty acids, and have 51% oil content. t. grandis and c. cathayensis are mostly produced in zhejiang province. the trace elements...

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