The Reaction of Sulfenic Acids with Peroxyl Radicals: Insights into the Radical-Trapping Antioxidant Activity of Plant-Derived Thiosulfinates

2012 ◽  
Vol 18 (20) ◽  
pp. 6370-6379 ◽  
Author(s):  
Riccardo Amorati ◽  
Philip T. Lynett ◽  
Luca Valgimigli ◽  
Derek A. Pratt
Keyword(s):  
Antioxidant Activity ◽  
Peroxyl Radicals ◽  
Radical Trapping ◽  
Sulfenic Acids

scholarly journals Inspired by garlic: insights on the chemistry of sulfenic acids and the radical-trapping antioxidant activity of organosulfur compounds

2016 ◽  
Vol 94 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Jean-Philippe R. Chauvin ◽  
Zosia A.M. Zielinski ◽  
Derek A. Pratt
Keyword(s):  
Antioxidant Activity ◽  
Plant Species ◽  
Health Benefits ◽  
Organosulfur Compounds ◽  
Industrial Products ◽  
Radical Trapping ◽  
Related Plant ◽  
Sulfenic Acids ◽  
Antioxidant Mechanisms

Organosulfur compounds have long been recognized as important antioxidants for the preservation of petroleum-derived products. It has also been suggested that the health benefits of garlic and related plant species can be ascribed to the radical-trapping antioxidant activity of some of their unique organosulfur constituents, such as allicin. This account highlights our efforts to elucidate the radical-trapping antioxidant mechanisms of allicin and related plant-derived organosulfur compounds as well as the organosulfur compounds used to preserve commercial and industrial products.

scholarly journals Antioxidant activity of two edible isothiocyanates: sulforaphane and erucin is due to their thermal decomposition to sulfenic acids and methylsulfinyl radicals

2021 ◽  
pp. 129213
Author(s):  
Jakub Cedrowski ◽  
Kajetan Dąbrowa ◽  
Paweł Przybylski ◽  
Agnieszka Krogul-Sobczak ◽  
Grzegorz Litwinienko
Keyword(s):  
Thermal Decomposition ◽  
Antioxidant Activity ◽  
Sulfenic Acids

scholarly journals Pengaruh Penambahan Rempah dan Bentuk Minuman terhadap Aktivitas Antioksidan Berbagai Minuman Tradisional Indonesia

2017 ◽  
Vol 37 (1) ◽  
pp. 7 ◽  
Author(s):  
Aisyah Tri Septiana ◽  
Mohammad Samsi ◽  
Mustaufik Mustaufik
Keyword(s):  
Antioxidant Activity ◽  
Linoleic Acid ◽  
Free Radical ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Phenolic Contents ◽  
Beverage Type ◽  
Radical Trapping ◽  
Palm Sugar

Indonesia traditional beverages such as minuman jahe, kunyit asam, beras kencur, and minuman temulawak are usually made with the addition of spices. They can be served in the form of  liquid or powder. This research was aimed to study the effect of  the beverage type, addition of spices, and the form of product on their antioxidant activity. The type of sugar used in this study was palm sugar juice. Total phenolic contents were measured to  indicate the level of antioxidants. Measurement of antioxidant  activity was conducted by analyzing malonaldehyde from linoleic  acid and capturing capacity of DPPH radical. The results showed  that Indonesian traditional beverage could inhibit the oxidation of linoleic acid and capture free radicals. Free radical capturing  capacity of curcuma beverage greater than other beverages, but  the malonaldehyde (MDA) inhibitor effect was not different. Total phenolic content of curcuma tended to be higher than the other traditional beverages. The addition of spices could raise the level  of total phenolic content in beverages and increase free radical  trapping capacity. Drying the beverages into powder could reduce the levels of total phenolic content and but did not reduce the  antioxidant activity. ABSTRAKMinuman tradisional Indonesia seperti minuman jahe, kunyit  asam, beras kencur, dan minuman temulawak biasanya dibuat  dengan tambahan berbagai rempah. Minuman tersebut dapat  disajikan dalam bentuk cair maupun serbuk. Penelitian ini  bertujuan untuk mengetahui pengaruh jenis minuman,  penambahan rempah tambahan, dan bentuk minuman terhadap aktivitas antioksidan minuman. Jenis gula yang ditambahkan  adalah gula nira. Jenis antioksidan yang diuji adalah total fenolik. Pengukuran aktivitas antioksidan dilakukan dengan uji  penghambatan malonaldehid dan kapasitas penangkapan radikal  DPPH. Hasil penelitian menunjukkan bahwa minuman  tradisional Indonesia dapat menghambat oksidasi asam linoleat dan menangkap radikal bebas. Kapasitas penangkapan radikal  bebas oleh minuman temulawak lebih besar dibandingkan  minuman yang lain tetapi kemampuan penghambatan  malonaldehid (MDA) oleh minumaan tradisional tidak berbeda.  Total fenolik minuman temulawak cenderung lebih besar  dibandingkan minuman tradisional yang lain. Penambahan  rempah-rempah dapat meningkatkan kadar total fenolik  minuman dan meningkatkan kapasitas penangkapan radikal  bebas. Pembuatan minuman serbuk pada penelitian ini dapat  menurunkan kadar total fenolik tetapi tidak menurunkan aktivitas antioksidan.

Antioxidant activity of sugarcane molasses against 2,2′-azobis(2-amidinopropane) dihydrochloride-induced peroxyl radicals

2013 ◽  
Vol 141 (1) ◽  
pp. 466-472 ◽  
Author(s):  
Yonathan Asikin ◽  
Makoto Takahashi ◽  
Takashi Mishima ◽  
Masami Mizu ◽  
Kensaku Takara ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Peroxyl Radicals ◽  
Sugarcane Molasses

scholarly journals The antioxidant activity of polysulfides: it's radical!

2019 ◽  
Vol 10 (19) ◽  
pp. 4999-5010 ◽  
Author(s):  
Jean-Philippe R. Chauvin ◽  
Markus Griesser ◽  
Derek A. Pratt
Keyword(s):  
Antioxidant Activity ◽  
Peroxyl Radicals ◽  
Primary Antioxidant ◽  
Homolytic Substitution

Sulfurized olefins (polysulfides) containing four (or more) sulfur atoms react efficiently with peroxyl radicals by homolytic substitution, accounting for their primary antioxidant activity.

Evidence of Trolox and some gallates as synergistic protectors of erythrocytes against peroxyl radicals

1998 ◽  
Vol 76 (4) ◽  
pp. 661-664 ◽  
Author(s):  
J Wu ◽  
H Sugiyama ◽  
L -H Zeng ◽  
D Mickle ◽  
T -W Wu
Keyword(s):  
Antioxidant Activity ◽  
Vitamin E ◽  
Protective Effect ◽  
Propyl Gallate ◽  
Peroxyl Radical ◽  
Human Erythrocytes ◽  
Peroxyl Radicals ◽  
Methyl Ethyl ◽  
Radical Initiator ◽  
Individual Contributions

The peroxidation of human erythrocytes induced by peroxyl radical initiator and its inhibition by several gallate esters (e.g., propyl, methyl, ethyl) and Trolox (a more polar analogue of vitamin E) have been studied. The antioxidant activity was determined on erythrocytes against hemolysis generated by a thermal activator, 2,2prime-azobis-(2-amidinopropane)dihydrogenchloride. It was found that propyl gallate and its two analogues were more effective than Trolox in preventing cell lysis. However, the combination of gallate esters and Trolox produced a protective effect exceeding the arithmetic sum of their individual contributions. These perceived synergisms occur at more than one level of Trolox at a given level of a gallate ester.Key words: Trolox, gallates, synergism, peroxyl radicals.

scholarly journals Antioxidant Activity of Magnolol and Honokiol: Kinetic and Mechanistic Investigations of Their Reaction with Peroxyl Radicals

2015 ◽  
Vol 80 (21) ◽  
pp. 10651-10659 ◽  
Author(s):  
Riccardo Amorati ◽  
Julija Zotova ◽  
Andrea Baschieri ◽  
Luca Valgimigli
Keyword(s):  
Antioxidant Activity ◽  
Peroxyl Radicals ◽  
Mechanistic Investigations

Antioxidant Activity of Oat Extracts added to Human LDL Particles and in Free Radical Trapping Assays

2002 ◽  
Vol 36 (2) ◽  
pp. 209-218 ◽  
Author(s):  
David A. Gray ◽  
Matthew J. Clarke ◽  
Cathy Baux ◽  
John P. Bunting ◽  
Andrew M. Salter
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Radical Trapping ◽  
Ldl Particles

scholarly journals Penetapan Total Flavonoid, Aktivitas Antioksidan dan Karakterisasi Nanopartikel Ekstrak Etanol Daun Kelor (Moringa pterygosperma Gaertn.)

2019 ◽  
Vol 11 (1) ◽  
pp. 49
Author(s):  
Tinta Julianawati ◽  
Hendy Hendarto ◽  
Widjiati Widjiati
Keyword(s):  
Antioxidant Activity ◽  
Particle Size ◽  
Herbal Medicine ◽  
Leaf Extract ◽  
Total Flavonoid ◽  
Peroxyl Radicals ◽  
Chemical Components ◽  
Dpph Method ◽  
Moringa Leaf Extract

Moringa pterygosperma is one of the plants in Indonesia that is often used in herbal medicine. Moringa leaves contain many phytochemical compounds, one of the compounds is flavonoids which function as antioxidants. Flavonoid compounds in vitro can inhibit lipid peroxidation by breaking the chain of peroxyl radicals. Moringa leaf benefits in the field of herbal medicine are formed with a variety of preparations. One of the preparations is in the form of extracts with the aim of attracting chemical components to natural materials The extraction process has a disadvantage because the level of solubility in water is still low. The nanoparticle technique is a strategy to increase the bioavalbicibility of herbal active compounds. This research was experimental in order to determine the total flavonoid levels contained in Moringa leaf extract. In addition, it was also to find out the antioxidant activity and particle size of the moringa leaf extract nanoparticles. Determination of flavonoid levels using spectrophotometric methods. The antioxidant activity of moringa leaf extract nanoparticles was tested using the DPPH method (2,2-diphenyl-picrylhdrazyl) and to determine the particle size used by using the Particle Size Analyzer (PSA). The results of the study showed total flavonoid levels in moringa leaf extract (1.97 ± 1.07)%. Antioxidant activity of 451.8 ppm with a reduction of 2.8% and particle size in the moringa leaf extract nanoparticles of ± 134.78 nm. Moringa leaf extract nanoparticles include low antioxidants. Keywords: moringa; nanoparticles; antioxidants

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