scholarly journals Antioxidant Compounds from Microalgae: A Review

Marine Drugs ◽  
2021 ◽  
Vol 19 (10) ◽  
pp. 549
Author(s):  
Noémie Coulombier ◽  
Thierry Jauffrais ◽  
Nicolas Lebouvier
Keyword(s):  
Antioxidant Activity ◽  
Natural Products ◽  
Mode Of Action ◽  
Natural Antioxidants ◽  
Culture Conditions ◽  
Antioxidant Compounds ◽  
Oxygen Species ◽  
Synthetic Antioxidants ◽  
Metabolic Plasticity ◽  
The Right

The demand for natural products isolated from microalgae has increased over the last decade and has drawn the attention from the food, cosmetic and nutraceutical industries. Among these natural products, the demand for natural antioxidants as an alternative to synthetic antioxidants has increased. In addition, microalgae combine several advantages for the development of biotechnological applications: high biodiversity, photosynthetic yield, growth, productivity and a metabolic plasticity that can be orientated using culture conditions. Regarding the wide diversity of antioxidant compounds and mode of action combined with the diversity of reactive oxygen species (ROS), this review covers a brief presentation of antioxidant molecules with their role and mode of action, to summarize and evaluate common and recent assays used to assess antioxidant activity of microalgae. The aim is to improve our ability to choose the right assay to assess microalgae antioxidant activity regarding the antioxidant molecules studied.

Chemistry and antioxidant activity of plants containing some phenolic compounds

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Reactive Oxygen Species ◽  
Health Promotion ◽  
Antioxidant Activity ◽  
Natural Products ◽  
Natural Antioxidants ◽  
Health Impact ◽  
Oxygen Species ◽  
Living Things ◽  
Effective Antioxidant ◽  
Great Health

Natural antioxidants inhibit the adverse effects of the reactive oxygen species produced in living things and enable to survive. Depending on this principle, humans started using some plant products to cure from various diseases. Natural products have proved of great health impact on human traditionally and scientifically. Moreover, the research has so far done in the field of natural antioxidants. Therefore, antioxidants have been traditionally used as well as experimentally proved beneficial. The antioxidant components of the natural products constitute the major source of human health promotion and maintenance. The nature is still the perfect source for health promotion and for the supplementation of safe drugs. Great attention is mandatory to explore many underestimated plants with highly effective antioxidant activity. Few classes of natural products have received as much attention as phenolics and polyphenols.

scholarly journals Natural Antioxidants from Seeds and Their Application in Meat Products

Antioxidants ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 815 ◽  
Author(s):  
Paulo E. S. Munekata ◽  
Beatriz Gullón ◽  
Mirian Pateiro ◽  
Igor Tomasevic ◽  
Ruben Domínguez ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Food Industry ◽  
Meat Products ◽  
Natural Antioxidants ◽  
Synthetic Antioxidants ◽  
Oxidative Reactions ◽  
Health Related ◽  
Processing And Storage ◽  
And Storage

The use of synthetic antioxidants in the food industry has raised important questions about the effects of prolonged consumption on human health. On top of that, the consumption of meat products has been changing due to the awareness generated by health-related organizations. In this sense, exploring strategies to develop and produce healthier meat products has become a paramount concern. Several studies explored the composition of several seeds to characterize and explore the compounds with antioxidant activity, which are mainly composed of polyphenols. The use of antioxidant extracts in meat products has shown important results to delay the oxidative reactions in meat products derived from the processing and storage of meat products. Moreover, these extracts can also replace synthetic antioxidants and preserve the quality of meat products. Therefore, the aims of this review are first, to present the sources and compounds with antioxidant activity in seeds, and second, to discuss their protective effect against oxidative reactions in meat products.

scholarly journals Phenols and Melanoidins as Natural Antioxidants in Beer. Structure, Reactivity and Antioxidant Activity

Biomolecules ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 400 ◽  
Author(s):  
Alvaro Martinez-Gomez ◽  
Isabel Caballero ◽  
Carlos A. Blanco
Keyword(s):  
Antioxidant Activity ◽  
Free Radicals ◽  
Antioxidant Properties ◽  
Natural Antioxidants ◽  
Antioxidant Compounds ◽  
Appreciable Effect ◽  
Human Metabolism ◽  
The World ◽  
Maillard Products ◽  
By Products

Beer is one of the most consumed drinks around the world, containing a variety of compounds that offer both appreciated sensorial characteristics and health advantages. Important healthy compounds in beer are those with antioxidant properties that attenuate the content of free radicals produced as by-products in the human metabolism, exerting an appreciable effect against cancers or cardiovascular diseases. This work details a study of antioxidant compounds present in beer, focusing on the two main groups: phenols (including polyphenolic forms) and melanoidins, formed specifically during brewing as Maillard products. The fundaments of the most important methods to evaluate beer antioxidant activity, the main antioxidant compounds present in beer—especially those with healthy properties—and the new trends to increase beer antioxidant activity are also discussed.

scholarly journals Comparison of Antioxidants: The Limited Correlation between Various Assays of Antioxidant Activity

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3244
Author(s):  
Katarzyna Naparło ◽  
Mirosław Soszyński ◽  
Grzegorz Bartosz ◽  
Izabela Sadowska-Bartosz
Keyword(s):  
Reactive Oxygen Species ◽  
Lipid Peroxidation ◽  
Antioxidant Activity ◽  
Free Radical ◽  
Experimental System ◽  
Natural Antioxidants ◽  
Egg Yolk ◽  
Erythrocyte Membranes ◽  
Oxygen Species ◽  
Inhibitory Effects

The inhibitory effects a range of synthetic and natural antioxidants on lipid peroxidation of egg yolk and erythrocyte membranes induced by a free radical generator 2,2′-azobis(2-amidinopropane) dihydrochloride (AAPH) was compared, with significant differences being found between both systems. When the protection by selected antioxidants against the effects of AAPH on erythrocytes (hemolysis, oxidation of hemoglobin and glutathione (GSH) and generation of reactive oxygen species (ROS)) was studied, most antioxidants were protective, but in some tests (oxidation of hemoglobin and GSH) some acted as prooxidants, inducing oxidation in the absence of AAPH and enhancing the AAPH-induced oxidation. These results demonstrate a diversified action of antioxidants in different systems and point to a need for careful extrapolation of any conclusions drawn from one parameter or experimental system to another.

scholarly journals IDENTIFICATION OF SECONDARY METABOLIC AND TEST OF ACTIVITY ETHYL ACETATE FRACTION OF BANGUN¬- BANGUN (Coleus amboinicus Lour.) LEAVES AS ANTIOXIDANT

2020 ◽  
Vol 7 (1) ◽  
pp. 117-122
Author(s):  
Kasta Gurning
Keyword(s):  
Antioxidant Activity ◽  
Secondary Metabolites ◽  
Ethyl Acetate ◽  
Oxidation Process ◽  
Natural Antioxidants ◽  
Ethyl Acetate Fraction ◽  
The Body ◽  
Synthetic Antioxidants ◽  
Dpph Method ◽  
Coleus Amboinicus

Antioxidants have an important role in delaying the oxidation process and preventing the occurrence of degenerative diseases in the body. Antioxidants consist of synthetic and natural; the use of synthetic antioxidants in a relatively long period is hazardous so that the use of natural antioxidants is considered more potential and safe for the body. The process of extracting secondary metabolites from the leaves of bangun-bangun (Coleus amboinicus L.) is carried out by the maceration method with methanol, then partitioned in stages with n-hexane, chloroform, and ethyl acetate. This research intends to identify secondary metabolites and test antioxidant activity from the ethyl acetate fraction with the DPPH method. Phytochemical screening results of ethyl acetate fraction showed the different secondary metabolite groups such as alkaloids, phenolics & polyphenols, flavonoids, coumarin, and triterpenoids. Antioxidant activity (IC50) obtained is 64.97 with a healthy category, so that the potential to be used as a natural antioxidant.

scholarly journals Evaluation of phytochemical and superoxide dismutase activities of Enhalus acoroides (L.f.) Royle from coastal waters of North Sulawesi, Indonesia

2020 ◽  
Vol 13 (4) ◽  
pp. 676-680
Author(s):  
Febry S. I. Menajang ◽  
Mohammad Mahmudi ◽  
Uun Yanuhar ◽  
Endang Yuli Herawati
Keyword(s):  
Antioxidant Activity ◽  
Superoxide Dismutase ◽  
Natural Antioxidants ◽  
Antioxidant Compounds ◽  
Beneficial Effects ◽  
Enhalus Acoroides ◽  
North Sulawesi ◽  
Antioxidant Agents ◽  
Phytochemical Constituents ◽  
Concentration Series

Background and Aim: Seagrasses are an excellent and potential bioresource to discover new natural bioactive compounds such as antioxidants that have beneficial effects on health. Natural antioxidants have many functions in biological systems, primarily for defense against oxidation which produces free radicals in food, chemicals, and living systems. This study aimed to discover new natural antioxidant agents, Enhalus acoroides (L.f.) Royle was evaluated for phytochemical constituents and the antioxidant activity against superoxide dismutase (SOD) was assessed. Materials and Methods: Sample specimens of E. acoroides (L.f.) Royle collected from two different areas, Manembo- Nembo, Bitung (SG-A) and Bahoi, Likupang Barat (SG-B) waters, were extracted with methanol and solutions were prepared in a concentration series. Results: Extracts of the seagrass E. acoroides (L.f.) Royle cultivated in different areas have different phytochemical constituents and SOD activities. The secondary metabolites of phenols, flavonoids, and steroids contained in the ethyl acetic extracts of E. acoroides were linearly correlated with their antioxidant activity, which exhibited an IC50 of 7 ppm. Conclusion: E. acoroides (L.f.) Royle samples cultivated in the two areas contained different phytochemical constituent profiles, indicating an effect of environmental factors, and both can be used as potential natural sources of antioxidant compounds.

scholarly journals ESSENTIAL OIL AND EXTRACTS FROM THYMUS PRAECOX OPIZ SSP. POLYTRICHUS AS NATURAL ANTIOXIDANTS

2016 ◽  
Vol 1 (13) ◽  
Author(s):  
Nada V. Petrović ◽  
Slobodan S. Petrović ◽  
Dubravka Jovičić ◽  
Marina Francišković
Keyword(s):  
Antioxidant Activity ◽  
Essential Oil ◽  
Functional Food ◽  
Nutritional Supplements ◽  
Natural Antioxidants ◽  
Antioxidant Potential ◽  
Synthetic Antioxidants ◽  
Food Ingredients ◽  
Medicinal Value

Spices and herbs have been used for centuries by many cultures to enhance the flavor and aroma offoods. Early cultures also recognized the value of using spices and herbs in preserving foods and fortheir medicinal value. In the present study the essential oil of wild growing Thymus praecox Opiz ssp.polytrichus was isolated by hydrodistillationprocess. Extracts of T. praecox ssp.polytrichuswereprepared by using solvents of varying polarity. Antioxidant potential and ability of essential oil andextractsto neutralize DPPH radicals was investigated. The essential oil showed significantlyhigher antioxidant activity compared with synthetic antioxidants BHA and BHT. This workprovides the basis for the present rapidly increasing interest for the use of natural antioxidants as foodantioxidants, functional food ingredients and/or as nutritional supplements.

The antioxidant activity of Lactic acid bacteria and probiotics: a review

2021 ◽  
Author(s):  
Azita Faraki ◽  
Fatemeh Rahmani
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Natural Antioxidants ◽  
Oxidation Reactions ◽  
Synthetic Antioxidants ◽  
In Vivo Models ◽  
Positive Effects

Probiotics and Lactic Acid Bacteria play important roles such as the production of antimicrobial compounds and other metabolites. So they have positive effects on human health. When reactive oxygen species generated in excess or cellular defenses are deficient, biomolecules can be damaged by the oxidative stress process. Various studies have shown that the best way to protect the human body from the effects of oxidation reactions is to avoid them, which can be accomplished by using antioxidants. Due to the damages of synthetic antioxidants, their usage has been discussed. Nowadays natural antioxidants derived from bio-resources have recently gained a lot of attention as a potential replacement for synthetic antioxidants. Probiotic bacteria are thought to defend against oxidative stress by restoring the gut microbiota, according to hypothesis of some scientists. This type of microorganisms indicated their antioxidant activity by producing and increasing antioxidant enzymes, production of secondary metabolites, small hydrolyzed peptides in food, resistance to the presence of hydrogen peroxide, and production of intracellular and extracellular compounds such as Exopolysaccharides. Also, they have shown their positive effect on in vivo models. In conclusion, according to the results of studies, lactic acid bacteria and probiotics are significant sources of natural antioxidants. Therefore, they have important research value and market development potential. Also, it should be noted that the mechanism of antioxidant activity of this group of microorganisms has not been fully investigated, this requires further research.

scholarly journals Antioxidant activity of Trachystemon orientalis (L.) G. Don (Borage) grown and eaten as food in Ordu, Turkey

2015 ◽  
Vol 61 (4) ◽  
pp. 40-51 ◽  
Author(s):  
Melek Col Ayvaz
Keyword(s):  
Antioxidant Activity ◽  
Natural Products ◽  
Total Antioxidant Capacity ◽  
Water Extract ◽  
Ethanol Extract ◽  
Total Phenolic ◽  
Synthetic Antioxidants ◽  
Total Antioxidant ◽  
Phenolic And Flavonoid

SummaryIntroductıon: Instead of synthetic antioxidants, using of natural products with antioxidant activity is demanded.Objectıve: The aim of this study is to evaluate the antioxidant activity and total phenolic and flavonoid contents of theTrachystemon orientalis(borage) obtained from Ordu.Methods: The water and ethanol extracts of the borage plant were investigated by using severalin vitroantioxidant activity tests such as total antioxidant capacity, O2•−,•OH, DPPH and ABTS radicals scavenging activities, hydrogen peroxide scavenging activity, FRAP, Fe2+chelating and reducing power assays in order to make effective comparisons.Results: Water extract of theT. orientalishad the more phenolic (90 mg GA/g extract) and flavonoid (56.88 mg CT/g extract) contents than ethanol extract. Furthermore, both of the extracts showed strong antioxidant and radical scavenging activities determined by differentin vitromodels. The highest total antioxidant capacity as ascorbic acid equivalents of 244.50 mg/g extract was also calculated for water extract. Generally, a relationship between total phenolic content and antioxidant activity was established. It is also an important finding for an edible food source that the phenolic and flavonoid content and antioxidative activities for water extract was higher than the ethanol extract.Conclusıon:T. orientaliscould be used as a food ingredient instead of synthetic antioxidants and all results will contribute to the recent increase in investigations on using natural products in many areas such as food, pharmacy, alternative medicine and natural therapy.

Obtaining of the antioxidants by supercritical fluid extraction

2011 ◽  
Vol 65 (1) ◽  
pp. 79-86 ◽  
Author(s):  
Nada Babovic ◽  
Slobodan Petrovic
Keyword(s):  
Antioxidant Activity ◽  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
Food Industry ◽  
Natural Antioxidants ◽  
Butylated Hydroxytoluene ◽  
Great Effort ◽  
Synthetic Antioxidants ◽  
Fluid Extraction ◽  
Antioxidant Power

One of the important trends in the food industry today is demand for natural antioxidants from plant material. Synthetic antioxidants such as butylated hydroxytoluene (BHT), and butylated hydroxyanisole (BHA) are now being replaced by the natural antioxidants because of theirs possible toxicity and as they may act as promoters of carcinogens. The natural antioxidants may show equivalent or higher antioxidant activity than the endogenous or the synthetic antioxidants. Thus, great effort is being devoted to the search for alternative and cheap sources of natural antioxidants, as well as to the development of efficient and selective extraction techniques. The supercritical fluid extraction (SFE) with carbon dioxide is considered to be the most suitable method for producing natural antioxidants for the use in food industry. The supercritical extract does not contain residual organic solvents as in conventional extraction processes, which makes these products suitable for use in food, cosmetic and pharmaceutical industry. The recovery of antioxidants from plant sources involves many problematic aspects: choice of an adequate source (in terms of availability, cost, difference in phenolic content with variety and season); selection of the optimal recovery procedure (in terms of yield, simplicity, industrial application, cost); chemical analysis of extracts (for optimization purposes a fast colorimetric method is more preferable than a chromatographic one); evaluation of the antioxidant power (preferably by the different assay methods). The paper presents information about different operational methods for SFE of bioactive compounds from natural sources. It also includes the various reports on the antioxidant activity of the supercritical extracts from Lamiaceae herbs, in comparison with the activity of the synthetic antioxidants and the extracts from Lamiaceae herbs obtained by the conventional methods.

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