نتایج جستجو برای: synthetic phenolic antioxidants

تعداد نتایج: 185325  

Journal: :Molecules 2010
Ashwell R Ndhlala Mack Moyo Johannes Van Staden

Research on the use, properties, characteristics and sources of antioxidants especially phenolic compounds, flavonoids, vitamins, synthetic chemicals and some micronutrients began in the late 18(th) century. Since then antioxidant research has received considerable attention and over a hundred thousand papers have been published on the subject. This has led to a rampant use of antioxidants in o...

Journal: :پژوهش های علوم و صنایع غذایی ایران 0
sahar lashgari majid javanmard

nowadays, the use of natural antioxidants as alternative antioxidants is more acceptable than synthetic antioxidants mainly for negative effects such as carcinogenicity and toxicity. this has led to an increasing interest in the search for natural antioxidants. the objectives of this study were to measure total crude phenolic compounds and in sorghum grain as natural antioxidant sources, to det...

2014
V. A. Vavilin

Synthetic water-soluble phenolic antioxidants are known anti-inflammatory chemicals, some of them were shown to induce components of antioxidative defense enzymes NADPH:quinone oxidoreductase (NQO1) and glutathione-S-transferase (GST) via activation of Nrf2 pathway. Our experimental in vivo models have demonstrated an increase of both gstp1 and nqo1 expression in the liver of mice treated with ...

Journal: :analytical and bioanalytical chemistry research 0
mir ali farajzadeh department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran maryam abbaspoura abbaspour department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran mohammad reza afshar mogaddama afshar mogaddam department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran ali akbar alizadeh nabil alizadeh nabil food and drug laboratories, tabriz university of medical sciences, tabriz, iran

an air–assisted liquid–liquid microextraction method for the extraction and preconcentration of trace amounts of some synthetic phenolic antioxidants in biological fluids followed by their determination by gas chromatography–flame ionization detection has been reported. in this method the target analytes are extracted into a few microliters of carbon tetrachloride (extraction solvent) from an a...

2015
Samaneh PEZESHK Seyed Mahdi OJAGH Alireza ALISHAHI

Pezeshk S., Ojagh S.M., Alishahi A. (2015): Effect of plant antioxidant and antimicrobial compounds on the shelf-life of seafood – a review. Czech J. Food Sci., 33: 195–203. While the use of synthetic antioxidants and antibacterials to keep the quality of seafood products has become a commonplace, consumer concern about their safety has motivated the seafood industry to seek natural alternative...

Journal: :Journal of agricultural and food chemistry 2000
L R Fukumoto G Mazza

Methods for determining primary antioxidant activity were evaluated. A beta-carotene bleaching method and a free radical method using 2, 2-diphenyl-1-picrylhydrazyl (DPPH(*)) were modified to rapidly test samples for potential antioxidant activity. Malonaldehyde production in a linoleic acid emulsion system assayed by an HPLC method was also used to determine antioxidant and prooxidant activiti...

Journal: :iranian journal of pharmaceutical sciences 0
mahmoodreza moein department of pharmacognosy, and pharmaceutical sciences research center, faculty of pharmacy, shiraz university of medical sciences, shiraz 71345, iran. soheila moein department of biochemistry, faculty of medicine, and infectious disease research center, hormozgan university of medical sciences, bandar abbas 79149-64153, iran.

butyl-hydroxytoluene (bht) is one of the major synthetic antioxidants with a wide range usage. replacement of artificial antioxidants with natural antioxidants is highly considered. in this research, the antioxidant activity of juniperus excelsa was investigated by using reducing power, dpph radical scavenging and inhibition of lipid peroxidation. also, the amounts of phenolic and flavonoid com...

2006
Nagendran Balasundram Kalyana Sundram Samir Samman

Phenolic compounds, ubiquitous in plants are an essential part of the human diet, and are of considerable interest due to their antioxidant properties. These compounds posses an aromatic ring bearing one or more hydroxyl groups and their structures may range from that of a simple phenolic molecule to that of a complex high-molecular weight polymer. Flavonoids, which bear the C6– C3–C6 structure...

Journal: :فصلنامه علمی پژوهشی گیاهان دارویی 0
h soleimani department of food science and technology, tarbiat modares university m barzegar department of food science and technology, tarbiat modares university, p.o.box: 14115-336, tehran, iran tel: + 98 – 21 – 48292323, fax: + 98 – 21 - 48292200 ma sahari department of food science and technology, tarbiat modares university h naghdi badi department of cultivation and development, institute of medicinal plants, acecr

background: nowadays, there's a growing demand for the natural antioxidants due to the harmful effects of synthetic antioxidants. therefore, introduction of new natural antioxidants (especially those with plant origin) is very important. objective: the present study explores the chemical constitution and antioxidant activity of leaf extract of hyssopus officinalis l. and extract of aerial ...

2000
K. D. Breese

The eciency of various commercial hindered phenol antioxidants was studied using di€erential scanning calorimetry (DSC) to determine the oxidation induction time (OIT) of antioxidant solutions in squalane. It was observed that a-tocopherol has an exceptionally high antioxidant activity. In fact, after normalisation for the molecular weight and functionality of each antioxidant, a-tocopherol wa...

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