PDF Publication Title:
Text from PDF Page: 005
Molecules 2020, 25, 3191 5 of 24 Scheme 1. Reaction of DPPH radical with hydrogen donor [46]. The ABTS (2,2′-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid) method or the TEAC (trolox equivalent antioxidant capacity) is based on generating a cation radical ABTS•+ formed by emitting one electron from the nitrogen atom (Scheme 2). ABTS is usually first oxidized by potassium persulphate [49], manganese dioxide [50], or AAPH (2,2′-azobis-(2-amidino-propane) dihydrochloride) [51] which gives rise to the cation radical ABTS•+. It absorbs at 414, 645, 734, and 815 nm and gives blue-green color. The preferred wavelength is 734 nm because the interference with other absorbing components is minimized. The ABTS•+ reacts with antioxidant leading to the decolorization of a solution in the range of 1–30 min [12,39,41,42]. Scheme 2. Generating of ABTS•+ and its reaction with an antioxidant [52]. The use of ABTS•+ radical has the advantage over the DPPH radical as it can be used in both aqueous and organic media [48]. ABTS method is also useful in studying the effect of pH on the antioxidant activity of various compounds [53]. However, the ABTS assay has some reservations in the overall applications, such as specificity for reaction of different antioxidants, storage of the radical, or processing method conditions [53]. DMPD radical scavenging assay is based on the conversion of transparent N,N-dimethyl-p-phenylenediamine dihydrochloride (DMPD) into the colored radical DMPD•+ in the presence of Fe ions or reactive species, such as hydroxyl radicals (Scheme 3). Antioxidants capable of hydrogen atom transfer decolorize the solution, absorbance decrease at 505 nm [12]. The main disadvantage of using this assay is that DMPD radical is soluble only in water, so there are limitations in using it for hydrophobic antioxidants determination [54].PDF Image | Antioxidant Activity Determination of Silver Nanoparticles
PDF Search Title:
Antioxidant Activity Determination of Silver NanoparticlesOriginal File Name Searched:
molecules-25-03191.pdfDIY PDF Search: Google It | Yahoo | Bing
Turbine and System Plans CAD CAM: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. More Info
Waste Heat Power Technology: Organic Rankine Cycle uses waste heat to make electricity, shaft horsepower and cooling. More Info
All Turbine and System Products: Infinity Turbine ORD systems, turbine generator sets, build plans and more to use your waste heat from 30C to 100C. More Info
CO2 Phase Change Demonstrator: CO2 goes supercritical at 30 C. This is a experimental platform which you can use to demonstrate phase change with low heat. Includes integration area for small CO2 turbine, static generator, and more. This can also be used for a GTL Gas to Liquids experimental platform. More Info
Introducing the Infinity Turbine Products Infinity Turbine develops and builds systems for making power from waste heat. It also is working on innovative strategies for storing, making, and deploying energy. More Info
Need Strategy? Use our Consulting and analyst services Infinity Turbine LLC is pleased to announce its consulting and analyst services. We have worked in the renewable energy industry as a researcher, developing sales and markets, along with may inventions and innovations. More Info
Made in USA with Global Energy Millennial Web Engine These pages were made with the Global Energy Web PDF Engine using Filemaker (Claris) software.
Infinity Turbine Developing Spinning Disc Reactor SDR or Spinning Disc Reactors reduce processing time for liquid production of Silver Nanoparticles.
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)