scholarly journals Antioxidant Capacity of Dark Red Corn � Biochemical Properties Coupled with Electrochemical Evaluation

2020 ◽  
Vol 71 (6) ◽  
pp. 31-41
Author(s):  
Maja Stevanovic ◽  
Sanja Stevanovic ◽  
Marija Mihailovic ◽  
Biljana Kiprovski ◽  
Goran Bekavac ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Antioxidant Properties ◽  
Biochemical Properties ◽  
Total Phenolic ◽  
Electrochemical Approach ◽  
High Antioxidant Activity ◽  
Corrosion Inhibition Efficiency ◽  
Cv Measurements ◽  
Phenolic And Flavonoid

Biochemistry coupled with electrochemical approach is employed in a fast, relatively simple, yet highly precise detection of a plant extract antioxidant properties. Antioxidant capacity of dark red corn grains was investigated electrochemically using cyclic voltammetry (CV) on glassy carbon electrode (GC). The linear polarization resistance (LPR) measurements were performed for examining the corrosion inhibitive behavior of polyphenolics on mild steel. The consistent positive correlation (r=0.99) was established between total phenolic and flavonoid contents obtained by CV measurements and spectrophotometric antioxidant assay (DPPH test). Both analyses confirm the high antioxidant activity of tested pigments. Determination of the corrosion inhibition efficiency revealed that the red corn pigments have anti-corrosion effect on mild steels.

scholarly journals Determination of antioxidant activity and phenolic compounds for basic standardization of Turkish propolis

2021 ◽  
Vol 64 (1) ◽  
Author(s):  
Aslı Özkök ◽  
Merve Keskin ◽  
Aslı Elif Tanuğur Samancı ◽  
Elif Yorulmaz Önder ◽  
Çiğdem Takma
Keyword(s):  
Antioxidant Capacity ◽  
Caffeic Acid ◽  
Caffeic Acid Phenethyl Ester ◽  
Total Phenolic ◽  
Scaling Analysis ◽  
Flavonoid Content ◽  
Multidimensional Scaling Analysis ◽  
Flavonoid Quercetin ◽  
Phenolic And Flavonoid

AbstractThis study aimed to determine the standard amount of antioxidant content and compounds of the propolis for the standardization of propolis. For this purpose, the total flavonoids, total phenolic, CUPRAC antioxidant capacity content and the diversity of phenolic and flavonoid components of these propolis samples were found by HPLC determined at the 23 propolis samples which were collected different regions of Turkey. Beside that, the similarities and differences of these 23 provinces to each other according to their antioxidant capacities were investigated by multidimensional scaling analysis. The total flavonoid content in the propolis samples were determined between 21.28 and 152.56 mg CE/g. The total phenolic content in the propolis samples was found between 34.53 mg and 259.4 mg GAE/g. CUPRAC antioxidant capacity of the propolis samples and antioxidant range was found from 95.35 to 710.43 mg TE/g. Also, 4 flavonoid [Quercetin (min.1.12–max.4.14 mg/g), Galangin (min.0.72–max.40.79 mg/g), Apigenin (min.1.07–max.17.35 mg/g), Pinocembrin (min.1.32–max.39.92 mg/g] and 6 phenolic acid [Caffeic acid (min.1.20–max.7.6 mg/g), p-Coumaric acid (min.1.26–max.4.47 mg/g), trans-Ferulic acid (min.1.28–max.4.92 mg/g), Protocatechuic acid (1.78 mg/g), trans-Cinnamic acid (min.1.05–max.3.83 mg/g), Caffeic Acid Phenethyl Ester (CAPE) (min.1.41–max.30.15 mg/g)] components were detected as mg/g, in different ratios in propolis samples collected from different regions. The feature of this study, so far, is to have the maximum number of samples representing the Turkish propolis, and so is thought to help to national and international propolis standard workings.

scholarly journals Application of the Folin-Ciocalteu method to the evaluation of Salvia sclarea extracts

Pharmacia ◽  
2019 ◽  
Vol 66 (4) ◽  
pp. 209-215 ◽  
Author(s):  
Nataliia Hudz ◽  
Oksana Yezerska ◽  
Mariia Shanajda ◽  
Vladimira Horčinová Sedláčková ◽  
Piotr P. Wieczorek
Keyword(s):  
Analytical Procedure ◽  
Phenolic Content ◽  
Antioxidant Properties ◽  
Total Phenolic ◽  
Optimum Conditions ◽  
Pharmaceutical Development ◽  
Salvia Sclarea ◽  
High Antioxidant Activity ◽  
High Level

Polyphenols are valuable group of phytoconstituents due to their high antioxidant activity and healing properties. Antioxidant properties of sages are attributed mainly to a high level of phenolic compounds. The aim of the present study was to elaborate an analytical procedure for the evaluation of the content of secondary metabolites of the polyphenol nature in the herb of Clary Sage (Salvia sclarea L.). Four crude extracts of Salvia sclarea herb obtained with different technologies were used to develop an analytical procedure for the total phenolic content (TPC) assay by spectrophotometric method. The optimum conditions for the analysis (time of the reaction, wavelength, and reference substances) were chosen and experimentally justified (60–80 min, 760 nm, gallic acid and rutin, respectively). Under these conditions, the developed analytical procedure is robust in the indicated time and easy for performing in phytochemical or technological laboratories. The yield of TPC from the herb of Salvia sclarea was the highest in the extracts prepared by heating at a temperature of 36–46 °C and with using the ultrasonic bath. TPC was the highest in the extract in which solvent-to-herb ratio was the least (10:1) and particle size was in the range of 2–5 mm. As a result of the studies, the analytical procedure of the determination of TPC was developed and its parameters were justified. This methodology complies with the requirements for pharmaceutical analysis to ensure the reliability of results during pharmaceutical development and routine control of Salvia sclarea extracts.

scholarly journals Ramification of pH in pectinase-assisted extraction on the antioxidant capacity of Arabica spent coffee ground (SCG) extract

Food Research ◽  
2020 ◽  
Vol 4 (4) ◽  
pp. 1303-1311
Author(s):  
N.A. Shukri ◽  
Z. Mohd Zin ◽  
N. MohdMaidin ◽  
Hasmadi M. ◽  
M.K. Zainol
Keyword(s):  
Antimicrobial Activity ◽  
Antioxidant Capacity ◽  
Antioxidant Properties ◽  
Total Flavonoid ◽  
Total Phenolic ◽  
Total Flavonoid Content ◽  
Flavonoid Content ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
Phenolic And Flavonoid

Spent coffee ground (SCG) is the by-product of coffee processing that is produced up to 45% in coffee beverage and instant coffee processing and is believed to contain high amounts of antioxidants. Despite the fact that SCG has exerted many advantages, the information on obtaining the antioxidant values using enzymes are still scarce. The objective of the study was therefore to determine the total phenolic and flavonoid content of antioxidant activity and antimicrobial activity in Arabica SCG extracted using pectinase at different pH values. Arabica SCG was extracted using pectinase at pH 3, pH 4, pH 5, pH 6 and pH 7 and analyzed for its anti-microbial activity and antioxidant properties (DPPH, FRAP, total phenolic and total flavonoid content along with individual flavonoids using HPLC). Arabica SCG was extracted using pectinase at pH 3, pH 4, pH 5, pH 6 and pH 7 and analyzed for its antimicrobial activity and antioxidant properties (DPPH, FRAP, total phenolic and total flavonoid content along with individual flavonoids using HPLC). The result showed that the antioxidant capacity of the SCG extract at pH 4 exhibited higher DPPH and FRAP values. The total phenolic and flavonoid content exhibited in (1.38±4.42, mg GAE/g sample and 22.57±0.27 mg QE/g of dry sample). Flavonoids namely quercetin, kaempferol, rutin, gallic acid, catechin, epigallocatechin gallate, pcoumaric acid and myricetin were present in all samples at various levels. The SCG in pH 7 extract showed the highest concentrations of the individual flavonoid compound in the sample and the highest inhibition zone on Pseudomonas aeruginosa and Staphylococcus aureus. Thus, the optimum pH of the pectinase which is pH 4-5 had provided the highest yield in antioxidant capacity and activity of the Arabica SCG extract with this extraction method that can be used for food preservation as well as in the nutraceutical industry.

scholarly journals Antimicrobial and antioxidant properties of some commercial honeys available on the Polish market

2017 ◽  
Vol 35 (No. 5) ◽  
pp. 401-406
Author(s):  
Makarewicz Małgorzata ◽  
Kowalski Stanisław ◽  
Lukasiewicz Marcin ◽  
Małysa-Paśko Magdalena
Keyword(s):  
Antioxidant Capacity ◽  
Physicochemical Parameters ◽  
Phenolic Content ◽  
Antioxidant Properties ◽  
Invertase Activity ◽  
Total Phenolic ◽  
Microbial Properties ◽  
E Coli ◽  
Thyme Honey

Six commercial natural honeys available on the Polish market were characterised with respect to their geographical and floral origins, physicochemical parameters and microbial properties. The study focused on a determination of the activity of the main enzymes, antioxidant capacity and identification of antimicrobial effects. Fructose was the predominant sugar in all tested honeys. The largest amount of hydroxymethylfurfural (HMF) was found in eucalyptus honey. It was found that thyme honey was characterised by the highest values of diastase number, invertase activity, antioxidant capacity and total phenolic content. A very week correlation between the antioxidant properties of tested honeys and their antimicrobial action against tested bacteria was observed. M. luteus and P. putida were resistant to most honey samples. All tested honeys showed antibacterial activity against E. coli and P. myxofaciens. B. subtilis was resistant only to eucalyptus honey.

Biochemical study of attached macroalgae from the Madeira Archipelago and beach-cast macroalgae from the Canary Islands: multivariate analysis to determine bioresource potential

2020 ◽  
Vol 63 (3) ◽  
pp. 283-298
Author(s):  
Nuno Nunes ◽  
Sofia Valente ◽  
Sónia Ferraz ◽  
Maria Carmo Barreto ◽  
Miguel A.A. Pinheiro de Carvalho
Keyword(s):  
Biochemical Study ◽  
Algal Species ◽  
Biochemical Properties ◽  
Total Phenolic ◽  
Total Carotenoids ◽  
The North ◽  
Madeira Archipelago ◽  
Total Carbohydrates ◽  
Beach Cast

AbstractFifteen attached macroalgae from the Madeira Archipelago, comprising three green, three red and nine brown algal species, as well as two beach-cast macroalgal samples, collected along the north shore of Gran Canaria, were assessed for their biochemical properties. The analysis included the determination of total minerals, total carbohydrates, protein, lipids, chlorophyll a, total carotenoids, total phenolic content, fucoxanthin and phycobilins (allophycocyanin, phycocyanin and phycoerythrin). The results showed a high variability of biochemical composition, allowing for the targetting of specific bioresources for particular purposes, including functional foods. This work provides the foundation for a biorefinery strategy implementation plan, for which specific macroalgae may be targeted for valuable and beneficial compounds.

Correlation of Total Phenolic and Flavonoid Contents of Brazilian Honeys with Colour and Antioxidant Capacity

2013 ◽  
Vol 17 (1) ◽  
pp. 65-76 ◽  
Author(s):  
Luiza D'oliveira Sant'ana ◽  
Aurelio Baird Buarque Ferreira ◽  
Maria Cristina Affonso Lorenzon ◽  
Ricardo Luis Louro Berbara ◽  
Rosane Nora Castro
Keyword(s):  
Antioxidant Capacity ◽  
Total Phenolic ◽  
Phenolic And Flavonoid

scholarly journals Establishing Relationship between Vitamins, Total Phenolic and Total Flavonoid Content and Antioxidant Activities in Various Honey Types

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4399
Author(s):  
Norhasnida Zawawi ◽  
Pei Juin Chong ◽  
Nurul Nadhirah Mohd Tom ◽  
Nurkhairina Solehah Saiful Anuar ◽  
Salma Malihah Mohammad ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Phenolic Acids ◽  
Antioxidant Activities ◽  
Natural Antioxidants ◽  
Total Phenolic ◽  
Flavonoid Content ◽  
Extrinsic Factors ◽  
Biochemical Compounds ◽  
Phenolic And Flavonoid

Honey is a well-known natural sweetener and is rich in natural antioxidants that prevent the occurrence of oxidative stress, which is responsible for many human diseases. Some of the biochemical compounds in honey that contribute to this property are vitamins and phenolic compounds such as phenolic acids and flavonoids. However, the extent to which these molecules contribute towards the antioxidant capacity in vitro is inconsistently reported, especially with the different analytical methods used, as well as other extrinsic factors that influence these molecules’ availability. Therefore, by reviewing recently published works correlating the vitamin, total phenolic, and flavonoid content in honey with its antioxidant activities in vitro, this paper will establish a relationship between these parameters. Based on the literature, vitamins do not contribute to honey’s antioxidant capacity; however, the content of phenolic acids and flavonoids has an impact on honey’s antioxidant activity.

scholarly journals Physicochemical and Bioactive Characteristics of Wild Grown Bilberry (Vaccinium myrtillus L.) Genotypes from Northeastern Turkey

2018 ◽  
Vol 46 (1) ◽  
pp. 128-133 ◽  
Author(s):  
Ferit CELIK ◽  
Mehmet Ramazan BOZHUYUK ◽  
Sezai ERCISLI ◽  
Muttalip GUNDOGDU
Keyword(s):  
Vitamin C ◽  
Antioxidant Capacity ◽  
Gallic Acid ◽  
Antioxidant Properties ◽  
Fruit Weight ◽  
Total Phenolic ◽  
Soluble Solid Content ◽  
Anthocyanin Content ◽  
Total Anthocyanin ◽  
Antioxidant Power

In present study, fruit weight, fruit firmness, external fruit color, soluble solid content, pH, titratable acidity, vitamin C, total phenolics, total anthocyanins, and antioxidant capacity of eight wild bilberry grown in Coruh valley in northeastern Turkey were determined. The blueberry cv. ‘Bluecrop’ is also included study to make comparison with bilberry genotypes. Antioxidant activity of bilberry and blueberry fruits were comparatively assessed by FRAP (Ferric reducing antioxidant power) assay. Significantly higher content of phenolics and anthocyanins was found in bilberry fruits than in blueberry fruits. However blueberry cv. ‘Bluecrop’ exhibited higher fruit weight and vitamin C content than bilberry fruits. Total phenolic and total anthocyanin content was 327 mg gallic acid equivalent and 142 mg of cyanidin-3-glucoside equivalent in 100 g fresh fruit in cv. ‘Bluecrop’ while it was between 492-563 mg gallic acid equaivalent and 307-342 mg of cyanidin-3-glucoside equivalent in 100 g fresh fruits of  bilberry accessions. Moreover, wild accessions approximately had 2-3 folds higher antioxidant capacity than cv. ‘Bluecrop’. Results suggest the possibility of improving the bioactive and antioxidant properties of bilberry cultivars based food products by using wild ones in cross breeding. It was also concluded that genotypes significantly affect their bioactive content and consequently the possibility of using wild bilberry fruits as a potential source of natural antioxidants in food industry.

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