LACK OF EFFECT OF OXYGEN-RADICAL SCAVENGING SYSTEMS IN THE PRESERVED REPERFUSED RABBIT KIDNEY

1989 ◽  
Vol 48 (3) ◽  
pp. 393-395 ◽  
Author(s):  
ROBERT J. WINCHELL ◽  
NICHOLAS A. HALASZ
Keyword(s):  
Radical Scavenging ◽  
Oxygen Radical ◽  
Rabbit Kidney ◽  
Effect Of Oxygen

Sequestration and Oxygen Radical Detoxification as Mechanisms of Paraquat Resistance

Weed Science ◽  
1994 ◽  
Vol 42 (2) ◽  
pp. 277-284 ◽  
Author(s):  
Jonathan J. Hart ◽  
Joseph M. Di Tomaso
Keyword(s):  
Active Oxygen Species ◽  
Radical Scavenging ◽  
Resistance Mechanisms ◽  
Oxygen Radical ◽  
Membrane Properties ◽  
Chloroplast Envelope ◽  
Cross Resistance ◽  
Paraquat Resistance ◽  
Plant Cell Membranes ◽  
Scavenging Enzymes

Evidence in the literature has generally supported either of two paraquat resistance mechanisms: an increase in activity of oxygen radical-scavenging enzymes in resistant plants which affords protection from active oxygen species formed by paraquat; and sequestration of paraquat away from its site of action in the chloroplast. Evidence for the first model relies primarily on measurement of increased enzyme activity and cross-resistance to other oxygen radical-generating stresses in resistant plants. The sequestration model is supported by data showing decreased translocation of paraquat and absence of paraquat injury in plant systems that do not have increased levels of protective enzymes. An alteration in paraquat transport at one of several plant cell membranes could confer resistance by modifying movement of paraquat into the compartment bounded by that membrane. Properties of the plasmalemma, chloroplast envelope, and tonoplast that may be important to paraquat transport are discussed and data supporting or discounting specific membrane alterations in resistant plants are presented. Finally, the possibility that both mechanisms may work in concert is addressed.

scholarly journals Anthocyanin Profile and Antioxidant Activity of Various Berries Cultivated in Korea

2015 ◽  
Vol 10 (6) ◽  
pp. 1934578X1501000 ◽  
Author(s):  
Hong-Sook Bae ◽  
Hyun Ju Kim ◽  
Jin Hee Kang ◽  
Rika Kudo ◽  
Takahiro Hosoya ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Sulfonic Acid ◽  
High Performance ◽  
Radical Scavenging ◽  
Total Content ◽  
Oxygen Radical ◽  
Free Radical Scavenging ◽  
Black Raspberry ◽  
Total Polyphenol ◽  
Anthocyanin Profile

This study examined the anthocyanin composition and antioxidant activity of various berries cultivated in Korea: blueberry, crowberry, Korean black raspberry, mulberry, and strawberry. The anthocyanins in berries were identified by high-performance liquid chromatography (HPLC) analysis, and each component was quantitatively analyzed. Furthermore, the antioxidant activity of berries was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical-scavenging, 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical cation decolorization, oxygen radical absorbance capacity (ORAC), and ferric ion reducing antioxidant (FRAP) assays. The results revealed that the total content of anthocyanins in crowberry was 35.1 mg/g of extract, which was higher than that in the other four major berry species (1.9-27.7 mg/g of extract). Nineteen anthocyanins were identified in the various berries. The major anthocyanins of crowberry were cyanidin-3-galactoside and delphinidin-3-galactoside, and those from Korean black raspberry were cyanidin-3-rutinoside and cyanidin-3-sambubioside-5-rhamnoside. These two berries also had relatively strong antioxidant activity accompanied by high total polyphenol contents. Thus, consumption of crowberry and Korean black raspberry may be beneficial in reducing the risk of developing lifestyle-related chronic diseases because of their strong antioxidant activity.

Changes in Plasma Levels of Oxygen Radical Scavenging Enzymes during Extracorporeal Membrane Oxygenation in a Lamb Model

Neonatology ◽  
1993 ◽  
Vol 64 (2-3) ◽  
pp. 134-139 ◽  
Author(s):  
J. Möller ◽  
J.T. Gilman ◽  
J. Sussmane ◽  
A. Raszynski ◽  
J. Wolfsdorf
Keyword(s):  
Extracorporeal Membrane Oxygenation ◽  
Plasma Levels ◽  
Radical Scavenging ◽  
Oxygen Radical ◽  
Membrane Oxygenation ◽  
Scavenging Enzymes

Study on the Extraction and Antioxidant Activity of Total Flavonoids from Netted Melon with Ultrasonic

2013 ◽  
Vol 807-809 ◽  
pp. 2003-2008
Author(s):  
Xi Yun Sun ◽  
Shu Yang ◽  
Chang Liu ◽  
Tian Lai Li ◽  
Ya Qi Duan
Keyword(s):  
Antioxidant Activity ◽  
Radical Scavenging ◽  
Extraction Yield ◽  
Oxygen Radical ◽  
Orthogonal Test ◽  
Total Flavonoids ◽  
Single Factor ◽  
Orthogonal Tests ◽  
Pyrogallol Autoxidation ◽  
Reducing Capacity

The single factor and orthogonal tests were designed to study the perfect conditions of extracting total flavononids from Netted Melon and the antioxidant activity of the extract. Firstly,the best conditions of extracting total flavononids from Netted Melon by single factor and orthogonal test was:ultrasonic power was 60%(250W) ,concentration of ethanol was 90%(V/V),extraction time was 60min ,volume of ethanol was 25mL.Under these conditions,the extraction yield of flavonoids was 0.2247 mg/g,which was 88.43% of the result of soxhlet,while,the time was 25% of soxhlet,from which the work efficiency was greatly improved. Then Prussian blue, Pyrogallol autoxidation, Phenanthroline and DPPH were used to research the antioxidant activity of flavonoid. It shows that flavonoid of Netted Melon can remove DPPH and hydroxyl radical strongly, also it has reducing capacity, but its ability of oxygen radical scavenging is poor.

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