Ascorbic acid and copper in linoleate oxidation. I. Measurement of oxidation by ultraviolet spectrophotometry and the thiobarbituric acid test

Haase, G.; Dunkley, W.L.

doi:10.1016/s0022-2275(20)43049-4

Cited by 41 publications

(2 citation statements)

References 24 publications

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“…The acceleratory effect of alkaline conditions on the degradation of ascorbic acid is well known (Buettner & Jurkiewicz, 1996) and the relative stability of ascorbic acid in nanopure water at pH 4 is also evident. The lower initial absorbance is due to the difference in the absorption spectrum of ascorbic acid in an acidic pH (Haase & Dunkley, 1969). The contribution of ROS generated from hydrogen peroxide, which is produced from the degradation of ascorbic acid, is evident from the stability of the samples flushed with argon at pH 9.0.…”

Section: Ascorbic Acid Degradation At Alkaline Phmentioning

confidence: 99%

Oxygen dependency of one-electron reactions generating ascorbate radicals and hydrogen peroxide from ascorbic acid

Boatright

2016

Food Chemistry

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The effect of oxygen on the two separate one-electron reactions involved in the oxidation of ascorbic acid was investigated. The rate of ascorbate radical (Asc(-)) formation (and stability) was strongly dependent on the presence of oxygen. A product of ascorbic acid oxidation was measurable levels of hydrogen peroxide, as high as 32.5 μM from 100 μM ascorbic acid. Evidence for a feedback mechanism where hydrogen peroxide generated during the oxidation of ascorbic acid accelerates further oxidation of ascorbic acid is also presented. The second one-electron oxidation reaction of ascorbic acid leading to the disappearance of Asc(-) was also strongly inhibited in samples flushed with argon. In the range of 0.05-1.2 mM ascorbic acid, maximum levels of measurable hydrogen peroxide were achieved with an initial concentration of 0.2 mM ascorbic acid. Hydrogen peroxide generation was greatly diminished at ascorbic acid levels of 0.8 mM or above.

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Section: Ascorbic Acid Degradation At Alkaline Phmentioning

confidence: 99%

Oxygen dependency of one-electron reactions generating ascorbate radicals and hydrogen peroxide from ascorbic acid

Boatright

2016

Food Chemistry

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“…For lipid peroxidation assay, the oxidation of linoleic acid under UV light was used to simulate the lipid peroxidation. [ 47 ] Ethanol, PBS, and linoleic acid were mixed (5:5:1) and irradiated by UV light (365 nm) for 90 min to generate the peroxidation. Then, 400 µL of different concentrations (1, 4, and 8 mg mL −1 ) of HASATA adhesive solutions in ddH 2 O was added to 1 mL lipid peroxidation mixture and made up to 4.4 mL with 1 mL ethanol solution, 1 mL PBS solution, and 1 mL 20% acetic acid (pH 3.5).…”

Section: Methodsmentioning

confidence: 99%

Plant‐Inspired Multifunctional Bioadhesives with Self‐Healing Adhesion Strength to Promote Wound Healing

Zhang

Martín-Saldaña

et al. 2022

Adv Materials Inter

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Bioadhesives are revolutionizing wound closure procedures. However, traditional bioadhesives lack functions to promote wound healing with a higher wound dehiscence rate than those treated with sutures. As a result, creating multifunctional bioadhesives to improve wound healing and facilitate wound care is extremely desirable in clinical settings. This study develops a series of multifunctional bioadhesives using succinic anhydride‐modified hyaluronic acid (HASA) and plant‐derived tannic acid (TA) with centrifuging and freeze‐drying. By varying the ratio of HASA to TA, HASATA 1:2, 1:7, and 1:14 are fabricated with tunable adhesive strength from 39.6 ± 8.2 to 63.0 ± 12.0 kPa. The bioadhesives exhibit self‐healing adhesive strength due to the reversible cohesion network developed by HASA and TA, enabling 25 to 50 times repeated wound closure. The animal studies reveal that the developed bioadhesives accelerate wound healing in the first week with a higher collagen content, more M2 macrophage upregulation and less oxidative stress. Moreover, the plant‐derived TA endows the bioadhesives with antioxidant properties against four kinds of free radicals, and antibacterial activity against both gram positive and negative bacteria. Altogether, these bioadhesives may open new avenues for noninvasive wound closure in the clinical setting.

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Isolierung und Struktur von langkettigen Alkylphenolen und ‐pyrocatecholen aus Plectranthus albidus (Labiatae)

Bürgi

Rüedi

1993

Helvetica Chimica Acta

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2. Strukturen der isolierten Verbindungen. ~ 2.1. (E, E)-I-(3',4'-Dihyciroxyphenyl) deca-l,3-dien-5-on (la). Die Verbindung (gelbe Nadeln) ist optisch inaktiv und wird in Losung sehr leicht oxidiert (Zers.). Das UV/VIS-Spektrum rnit nur einer mdrkanten Absorptionsbande (364 nm, log 8 4,49) lasst sich keinem uns bisher bekannt geworde-') Die vielschichtige Prohlematik dcr hiologischen Oxidationsprozesse und die damit verhundenen Forschungsaktivitaten sind in [I] zusammengefasst. 4, Plectrunthus albidus stammt ursprunglich aus Madagaskar. vgl. [16]. Das in dieser Arbeit verwendete Pflanzenmaterial wurde in der Umgebung von Nairobi von J . Kahurananga, East-African Herbarium, Nairobi, gesammelt und uns am 12.10.1977 als trockene Blatter zugesandt. Bezuglich der korrekten hotanischen Identifizierung bcsteht allerdings eine gewisse Unsicherheit; ein Herhar-Muster ist hei P . R. ahgelegt.Ausheuteangaben heziehen sich auf isolierte Reinsubstanzen aus trockenem Blattmaterial. Da sich la (teilweise auch 3a-g) an Kieselgel relativ leicht zersetzen, ist der effektive Gehalt in der Pflanze mit Sicherheit wesentlich hoher. Um den Bezug mit den hisher hekannt gewordenen ahnlichen, in der Alkyl-Kette nicht suhstituierten Naturstoffen hervorzuheben, werden diese allgemeinen Namen verwendet; systematische Namen im Exper. Ted. ' )

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Ascorbic acid and copper in linoleate oxidation. I. Measurement of oxidation by ultraviolet spectrophotometry and the thiobarbituric acid test

Cited by 41 publications

References 24 publications

Oxygen dependency of one-electron reactions generating ascorbate radicals and hydrogen peroxide from ascorbic acid

Oxygen dependency of one-electron reactions generating ascorbate radicals and hydrogen peroxide from ascorbic acid

Plant‐Inspired Multifunctional Bioadhesives with Self‐Healing Adhesion Strength to Promote Wound Healing

Isolierung und Struktur von langkettigen Alkylphenolen und ‐pyrocatecholen aus Plectranthus albidus (Labiatae)

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