scholarly journals Antioxidant activity and free radical-scavenging capacity of Gynura divaricata leaf extracts at different temperatures

2011 ◽  
Vol 7 (25) ◽  
pp. 40 ◽  
Author(s):  
Shuwen Cao ◽  
Chunpeng Wan ◽  
Yanying Yu ◽  
Shouran Zhou ◽  
Wei Liu ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Leaf Extracts ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity ◽  
Different Temperatures

Influence of Microbial Contamination on the Antioxidant Composition and Free Radical Scavenging Effects of Fresh and Decaying Spices

2012 ◽  
Vol 1 (1) ◽  
Author(s):  
L Azeez
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Microbial Contamination ◽  
Microbial Population ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Capsicum Frutescens ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity ◽  
Phytochemical Contents

This study examined the influence of microbial contamination on the antioxidant composition and free radical scavenging effects of fresh and decaying spices: Lycopersicon esculentum, Capsicum frutescens S, Capsicum frutescens T and Capsicum annum used by food vendors. Microbial load was enumerated with potato dextrose agar (PDA) using the pour plate technique, phytochemical components were determined using Folio-Ciocalteu, Aluminium chloride, acetone-hexane methods for phenolic, flavonoids and β-carotene & lycopene respectively while free radical scavenging capacity was determined using DPPH method. Decaying L. esculentum had highest microbial population of 7.14 X 105 cfu/g and fresh C. annum had the lowest microbial population of 0.72 X 101cfu/g. Microbial population in decaying spices were generally significantly higher than fresh spices. Aspergillus spp were found in all decaying spices and in fresh C. frutescens T. Microsporum spp were found in all fresh spices except in C. frutescens T and in decaying spices except in C. annum. There were significant decreases (p <0.05) in phenolic, flavonoid, β-carotene and free radical scavenging capacity contents of all decaying spices compared to fresh spices except for phenolic content in C. annum while significant decrease (p < 0.05) in lycopene content was obtained for only decaying L. esculentum compared to fresh one. Reduction in antioxidant activity and phytochemical contents could not be unconnected with the high microbial population in decaying spices because antioxidant activity and phytochemical contents significantly correlate with antibacterial activity. Thus, consumption of decaying spices as shown by our study could pose a serious health challenges due to the presence of high number of microbes detected and loss of healthprotecting ability of the spices. Â

scholarly journals Chemopreventative Potential of Plant-Based Extracts Coffee (Coffea) and Mauby (Colubrina Arborescens) using the Global Antioxidant Response (GAR) Method via in vitro Simulated Digestion

2021 ◽  
Vol 10 (3) ◽  
pp. 43
Author(s):  
Hannah Gross ◽  
Cheryl Rock ◽  
Yada Treesukosol ◽  
Virginia Gray
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Antioxidant Response ◽  
Free Radical Scavenging ◽  
Antioxidant Power ◽  
Simulated Digestion ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity

Plant-based extracts such as coffee (coffea) and Mauby (Colubrina Arborescens) were tested for chemopreventative potential by measuring their antioxidant activity (i.e., reducing power and free radical scavenging capacity) conventionally using chemical assays 1, 1-Diphenyl-2-picryl-hydrazyl (DPPH) and Ferric Reducing Antioxidant Power (FRAP). Alternately, extracts were also analyzed for their chemopreventative potential via a novel method (Global Antioxidant Response [GAR]), where they were subjected to simulated digestion before their antioxidant activity was determined via conventional methods previously mentioned. Next, the antioxidant capacities of the extracts, conventional versus the novel (GAR) method were compared. Overall, the analysis indicated that the reducing power (FRAP) and free radical scavenging capacity (DPPH) of coffee and Mauby were reduced (~16%) after undergoing simulated digestion. It was also observed that while the antioxidants in Mauby scavenged radicals at a significantly higher capacity than those in coffee (95.7% &plusmn; 0.67 and 90% &plusmn; 2.1 before digestion, and 77.7% &plusmn; 2.2 and 74.6% &plusmn; 2.3 after digestion, respectively), antioxidants in coffee exhibited higher reducing power compared to those in Mauby. Specifically, after undergoing simulated digestion, 1.12 mM FeSO4/mL &plusmn; 0.05 to 0.68 mM FeSO4/mL &plusmn; 0.07 ions were reduced before digestion, and 0.73 mM FeSO4/mL &plusmn; 0.09 to 0.48 mM FeSO4/mL &plusmn; 0.04 ions were reduced after digestion for coffee and Mauby, respectively. These findings suggest that while the antioxidants in coffee may have been more powerful in their ability to reduce ions, the antioxidants in Mauby may have been more effective in scavenging and neutralizing radicals.

Synthesis, Characterization, Free-radical Scavenging Capacity and Antioxidant Activity of Novel Series of Hydrazone, 1,3,4-oxadiazole and 1,2,4- triazole Derived from 3,5-dimethyl-1H-pyrazole

2019 ◽  
Vol 16 (7) ◽  
pp. 712-720 ◽  
Author(s):  
Khalid Karrouchi ◽  
Saad Fettach ◽  
Smaail Radi ◽  
El bekkaye Yousfi ◽  
Jamal Taoufik ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity ◽  
Anti Cancer ◽  
Ic50 Values

Background: Pyrazole is an important class of heterocyclic compound, has been shown to exhibit diverse biological and pharmacological activities such as anti-inflammatory, anti-cancer, antioxidant, etc. Methods: In this study, a series of novel 3,5-dimethyl-1H-pyrazole derivatives containing hydrazine 4a-l have been synthesized via the reaction of the 2-(3,5-dimethyl-1H-pyrazol-1-yl)acetohydrazide. All synthesized compounds have been tested for their in vitro antioxidant activities via utilization of 1,1-biphenyl-2-picrylhydrazyl (DPPH) as a free radical scavenging reagent. Results: The data reported herein indicates that compound 4k showed potential radical scavenging capacity and compounds 4f and 4g exhibited best activity for the iron binding while comparing with positive controls. Conclusion: Good activity was noted for some compounds. In particular, compound 4k showed the highest antioxidant activity with IC50 values of 22.79 ± 3.64 and 1.35 ± 0.66 μg/mL in the DPPH and ABTS tests, respectively.

Antioxidant activity and free radical-scavenging capacity of a selection of wild-growing Colombian plants

2011 ◽  
Vol 91 (13) ◽  
pp. 2399-2406 ◽  
Author(s):  
Juan C Argoti ◽  
Sofía Salido ◽  
Pablo J Linares-Palomino ◽  
Bernardo Ramírez ◽  
Braulio Insuasty ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity ◽  
Selection Of

Study on Antioxidant Activity of Aqueous Extracts from Scum of Mixed Juice

2011 ◽  
Vol 396-398 ◽  
pp. 1588-1591
Author(s):  
Yuan Yuan Pu ◽  
Qing Song Zou ◽  
Zi Yan Feng ◽  
An Gen Lu ◽  
Zhong Han ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Free Radical Scavenging ◽  
Water Extraction ◽  
Macroporous Resin ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity

The scum of mixed juice is a by-product in sugarcane factory, which used up-floating method for mixed juice clarification. The scum is of great research and utilization value due to its rich organic non-sugar compounds such as proteins, lipids and polyphenols. Studies on the free radical scavenging capacity and reducing power of water extraction sample (A) and macroporous resin purified sample (B) from mixed juice scum were investigated, comparing with Vc. It was showed that the antioxidant activity of macroporous resin purified sample (B) was much stronger than that of water extraction sample (A) and Vc in , and system. For example, the scavenging capacity of sample B on was 11 times than that of Vc and 1450 times of sample A. In addition, the free radical scavenging activity of sample A and B was dependent on the sample concentration. Results in this study indicated that scum of mixed juice may be a promising natural antioxidant, which can be used as additives in food industry or feed industry.

Antioxidant activity and free radical-scavenging capacity of ethanolic extracts of thyme, oregano, and marjoram

2009 ◽  
Vol 111 (11) ◽  
pp. 1111-1117 ◽  
Author(s):  
Ryszard Amarowicz ◽  
Zofia Żegarska ◽  
Ryszard RafaÅ‚owski ◽  
Ronald B. Pegg ◽  
Magdalena Karamać ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity ◽  
Ethanolic Extracts
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