Determination of antioxidant activity and antioxidant content in tomato varieties and evaluation of mutual interactions between antioxidants

LWT ◽  
2011 ◽  
Vol 44 (8) ◽  
pp. 1703-1710 ◽  
Author(s):  
Zora Kotíková ◽  
Jaromír Lachman ◽  
Alena Hejtmánková ◽  
Kateřina Hejtmánková
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Content

scholarly journals DETERMINATION OF BIOLOGICAL ACTIVITY OF SEA BUCKTHORN OILS AND EXTRACTS FROM THE CON-TENT OF LIPID ANTIOXIDANTS VIA MICROCALORIMETRY

2020 ◽  
pp. 223-230
Author(s):  
Nataliya Vital'yevna Sizova
Keyword(s):  
Antioxidant Activity ◽  
Sea Buckthorn ◽  
Biologically Active ◽  
Dry Extract ◽  
Antioxidant Content ◽  
Therapeutic Value ◽  
Lipid Fractions ◽  
Carbon Dioxide Extraction

An alternative method for assessing the quality of sea buckthorn oils and extracts from the concentration of biologically active lipid substances exhibiting antioxidant activity is considered. The method of microcalorimetry is used to assess the content of antioxidants. The heat of a model cumene oxidation reaction in the presence of sea buckthorn oils and extracts obtained by various technologies is registered. As compared to other methods for obtaining sea buckthorn lipid fractions, the extraction of sea buckthorn fruits with sunflower oil is considered to be an unproductive method, since an increase in antioxidant activity compared with the initial oil is found to be moderate: from 1.56∙10-3 to 1.69∙10-3 mol/kg. Sea buckthorn oil obtained by pressing berries (antioxidant content 6.12∙10-3 mol/kg) and carbon dioxide extraction of sea buckthorn meal (antioxidant content 5.92∙10-3 mol/kg) are of the highest biological value among the objects under study. The maximum amount of antioxidants (5.5∙10-2 mol/kg) is determined in a dry extract of sea-buckthorn fruits enriched with triterpenic acids of the ursan and olean series. The method for assessing the quality of extracts used in the work allows choosing the most efficient technique for processing sea buckthorn fruits. The concentration of antioxidants consisting of a complex of tocopherols, carotenoids, triterpenoids, lipophilic acids, and other compounds is a good criterion of the quality and therapeutic value of oils.

scholarly journals Flexible Potentiometric Sensor System for Non-Invasive Determination of Antioxidant Activity of Human Skin: Application for Evaluating the Effectiveness of Phytocosmetic Products

Chemosensors ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 76
Author(s):  
Aleksey V. Tarasov ◽  
Ekaterina I. Khamzina ◽  
Maria A. Bukharinova ◽  
Natalia Yu. Stozhko
Keyword(s):  
Antioxidant Activity ◽  
Human Skin ◽  
Skin Diseases ◽  
Silver Chloride ◽  
Potentiometric Sensor ◽  
Sensor System ◽  
Non Invasive ◽  
Pet Film ◽  
The Impact

In contemporary bioanalysis, monitoring the antioxidant activity (AOA) of the human skin is used to assess stresses, nutrition, cosmetics, and certain skin diseases. Non-invasive methods for skin AOA monitoring have certain advantages over invasive methods, namely cost-effectiveness, lower labor intensity, reduced risk of infection, and obtaining results in the real-time mode. This study presents a new flexible potentiometric sensor system (FPSS) for non-invasive determination of the human skin AOA, which is based on flexible film electrodes (FFEs) and membrane containing a mediator ([Fe(CN)6]3–/4–). Low-cost available materials and scalable technologies were used for FFEs manufacturing. The indicator FFE was fabricated based on polyethylene terephthalate (PET) film and carbon veil (CV) by single-sided hot lamination. The reference FFE was fabricated based on PET film and silver paint by using screen printing, which was followed by the electrodeposition of precipitate containing a mixture of silver chloride and silver ferricyanide (SCSF). The three-electrode configuration of the FPSS, including two indicator FFEs (CV/PET) and one reference FFE (SCSF/Ag/PET), has been successfully used for measuring the skin AOA and evaluating the impact of phytocosmetic products. FPSS provides reproducible (RSD ≤ 7%) and accurate (recovery of antioxidants is almost 100%) results, which allows forecasting its broad applicability in human skin AOA monitoring as well as for evaluating the effectiveness of topically and orally applied antioxidants.

scholarly journals Increase in the antioxidant content in biscuits by infusions or Prosopis chilensis pod flour

2021 ◽  
Vol 6 (1) ◽  
pp. 243-253
Author(s):  
Paula Andrea Conforti ◽  
Mariela Patrignani
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Capacity ◽  
Fracture Stress ◽  
Fracture Strain ◽  
Gluten Free ◽  
Maize Starch ◽  
Prosopis Chilensis ◽  
Antioxidant Content ◽  
Fat Level ◽  
Increasing Demand

Abstract Nowadays there is an increasing demand for healthy biscuits. The reduction in sugar and fat level, as well as the addition of bioactive compounds, is positively associated with a healthy diet. In the present work, low-fat and low-sugar biscuits were prepared with infusions (mate, coffee, and tea) or with Prosopis chilensis pod flour (PPF). Biscuits were made with maize starch and wheat flour (gluten formulations) or with gluten-free ingredients (gluten-free). The colour, texture, and the antioxidant capacity were evaluated in dough and biscuits. Among the formulations prepared with infusions, the mate dough showed the lowest firmness (1.1 N (gluten)-24.3 N (gluten-free)). However, no significant differences were found in the fracture stress of the final products (P > 0.05). Mate gluten biscuits and PPF gluten-free biscuits showed the highest fracture strain (16.2 and 9.4%, respectively) and the lowest Young’s modulus (7.3 and 13.3 MPa, respectively) in their groups. The highest antioxidant activity was found in biscuits with mate (8.7 µmol FeSO4/g (gluten)-4.3 µmol FeSO4/g (gluten-free)). These values were three times higher than the ones found in the control biscuits (2.9 µmol FeSO4/g (gluten)-3.9 µmol FeSO4/g (gluten-free)). The present results showed that the antioxidant content in biscuits could be successfully increased with infusion addition.

scholarly journals Antioxidant activity, xanthine oxidase inhibitory activity, and compounds determination of Cipadessa baccifera leaf extract

2021 ◽  
Author(s):  
Syarifah Ramadhani Lubis ◽  
Subandi Subandi ◽  
Muntholib Muntholib ◽  
Jamilah Abbas ◽  
Tjandrawati Mozef
Keyword(s):  
Antioxidant Activity ◽  
Xanthine Oxidase ◽  
Inhibitory Activity ◽  
Leaf Extract

scholarly journals ANTIMICROBIAL AND ANTIOXIDANT EFFECT OF NATURAL EXTRACTS FROM LEAVES, ROOT, STEM AND FLOWERS OF BACCHARIS LATIFOLIA FROM ECUADOR

2020 ◽  
pp. 78-84
Author(s):  
FAVIAN BAYAS-MOREJON ◽  
ANGELICA TIGRE ◽  
RIVELINO RAMON ◽  
DANILO YANEZ
Keyword(s):  
Antimicrobial Activity ◽  
Antioxidant Activity ◽  
Potassium Phosphate ◽  
Natural Antioxidants ◽  
Butylated Hydroxytoluene ◽  
Penicillin G ◽  
Diffusion Method ◽  
E Coli ◽  
Antibacterial And Antioxidant Activity

Objective: The increase in chronic and degenerative diseases and the use of synthetic antioxidants such as (butylated hydroxyanisole (BHA) or butylated hydroxytoluene (BHT)) are being restricted because they can be considered carcinogenic. Therefore, there is a growing interest in the search for natural antioxidants, especially from plants, due to their content in different bioactive compounds, such as antioxidants and antimicrobials. To evaluate the antibacterial and antioxidant activity of Baccharislatifolia extracts. Methods: For the determination of the antimicrobial activity of extracts of leaves, root, stem and flowers of Baccharislatifolia (Bl), the disk plate diffusion method was used, the strains of Listeria, Salmonella and E. coli were studied; antibiotics Penicillin G and Ciprofloxacin were the controls. For the antioxidant activity, a solution of H2O2 (Abs at 230 nm) was prepared in Potassium Phosphate Monobasic-Sodium Hydroxide buffer. Results: The antimicrobial activity against Listeria and Salmonella, showed that the extracts of leaves and flowers were more effective with inhibition zones>15 mm and>20 mm respectively. In front of E. coli, the extracts of flowers and stem were the best with zones>7.0 mm. Antibiotics studied inhibited the development of Listeria and Salmonella. However, E. coli isolates were resistant. In the antioxidant activity, the flower extract of Bl in 60 mg/ml presents a higher effect with 47.25%. Conclusion: Bl extracts from leaves and flowers were more efficient both in their antimicrobial and antioxidant capacity.

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