Transcript levels of antioxidative genes and oxygen radical scavenging enzyme activities in chilled zucchini squash in response to superatmospheric oxygen

2008 ◽  
Vol 47 (2) ◽  
pp. 151-158 ◽  
Author(s):  
Yonghua Zheng ◽  
Raymond W.M. Fung ◽  
Shiow Y. Wang ◽  
Chien Y. Wang
Keyword(s):  
Enzyme Activities ◽  
Radical Scavenging ◽  
Oxygen Radical ◽  
Transcript Levels

Investigation of Free Radical Scavenging Enzyme Activities and Lipid Peroxidation in Human Placental Tissues With Miscarriage

2006 ◽  
Vol 13 (5) ◽  
pp. 384-388 ◽  
Author(s):  
Aydan Biri ◽  
Mustafa Kavutcu ◽  
Nuray Bozkurt ◽  
Erdinç Devrim ◽  
Nilhan Nurlu ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Free Radical ◽  
Enzyme Activities ◽  
Radical Scavenging ◽  
Free Radical Scavenging

Wet and dry extraction of coconut oil: impact on lipid metabolic and antioxidant status in cholesterol coadministered rats

2009 ◽  
Vol 87 (8) ◽  
pp. 610-616 ◽  
Author(s):  
K. Govindan Nevin ◽  
Thankappan Rajamohan
Keyword(s):  
Antioxidant Enzyme ◽  
Enzyme Activities ◽  
Antioxidant Status ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Lipid Peroxide ◽  
Coconut Oil ◽  
Biologically Active ◽  
Antioxidant Enzyme Activities ◽  
Dry Process

Because coconut oil extracted by wet process (virgin coconut oil, VCO) is gaining popularity among consumers, this study was conducted to evaluate VCO compared with coconut oil extracted by dry process (copra oil, CO) for their influence on lipid parameters, lipid peroxidation, and antioxidant status in rats coadministered with cholesterol. VCO, CO, and cholesterol were fed in a semi-synthetic diet to 24 male Sprague–Dawley rats for 45 days. After the experimental period, lipid and lipid peroxide levels and antioxidant enzyme activities were observed. Chemical composition and antioxidant properties of the polyphenolic fraction from VCO and CO were also analyzed. The results showed that lipid and lipid peroxide levels were lower in VCO-fed animals than in animals fed either CO or cholesterol alone. Antioxidant enzyme activities in VCO-fed animals were comparable with those in control animals. Although the fatty acid profiles of both oils were similar, a significantly higher level of unsaponifiable components was observed in VCO. Polyphenols from VCO also showed significant radical-scavenging activity compared with those from CO. This study clearly indicates the potential benefits of VCO over CO in maintaining lipid metabolism and antioxidant status. These effects may be attributed in part to the presence of biologically active minor unsaponifiable components.

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.

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