scholarly journals Antioxidant activity of wheat and buckwheat flours

2010 ◽  
pp. 59-68 ◽  
Author(s):  
Ivana Sedej ◽  
Marijana Sakac ◽  
Aleksandra Misan ◽  
Anamarija Mandic
Keyword(s):  
Total Phenolics ◽  
Antioxidant Activities ◽  
Reducing Power ◽  
Chelating Activity ◽  
Ethanolic Extracts ◽  
Dpph Scavenging Activity ◽  
Dpph Scavenging ◽  
Wheat Flours ◽  
Gallic Acid Equivalent ◽  
Buckwheat Flour

Antioxidative activities of wheat flours (type 500 and wholegrain) and buckwheat flours (light and wholegrain) were tested using 1,1-diphenyl-2-picrylhydrazyl (DPPH?)-scavenging activity, reducing power and chelating activity on Fe2+. Also, the content of the total phenolics of ethanolic extracts was estimated. Polyphenolics content (expressed as gallic acid equivalent, GAE) in wheat flours varied between 37.1 and 137.2 ?g GAE/g extract, while its content in buckwheat flour were at least four time higher and ranged between 476.3 and 618.9?g GAE/g extract. Ethanolic extracts of buckwheat flours exhibited higher antioxidant activities in all the assays, except for chelating activity. Regarding all the obtained results, it can be concluded that bakery products produced with buckwheat flour could be regarded as potential functional foods.

scholarly journals Effects of Water Quality on Dissolution of Yerba Mate Extract Powders

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Wen-Ying Huang ◽  
Pei-Chi Lee ◽  
Jaw-Cherng Hsu ◽  
Yu-Ru Lin ◽  
Hui-Ju Chen ◽  
...  
Keyword(s):  
Antioxidant Activities ◽  
Tap Water ◽  
Reducing Power ◽  
Water Sources ◽  
Total Phenol Content ◽  
Yerba Mate ◽  
Scavenging Capacity ◽  
Dpph Scavenging Activity ◽  
Dpph Scavenging ◽  
Mate Tea

Yerba mate tea is known as one of the most popular nonalcoholic beverages favoured by South Americans due to its nutrition facts and medicinal properties. The processing of yerba mate tea is found to affect the properties of its final forms. This study presents an investigation into the effects of water sources on the dissolution of yerba mate extract powders. Comparisons were conducted between yerba mate teas prepared by dissolving yerba mate extract powders into tap water and deionized water. Topics to be explored in this work are the major compositions and antioxidant activities, including total phenol content, reducing power, DPPH scavenging activity, and ABTS+• scavenging capacity. It is indicated that there is little difference for antioxidant activities and major constituents of yerba mate teas between both water sources. However, a deeper color is seen in the tap water case, resulting from the reaction between tannic acid and ions. This research finding can be treated as a way to benefit the yerba mate tea processing for applications.

scholarly journals Ganoderma lucidum Metanolik Ekstraktının Fitotoksik Etkilerinin ve Antioksidan Potansiyelinin Araştırılması

2016 ◽  
Vol 4 (3) ◽  
pp. 163 ◽  
Author(s):  
Fuat Bozok ◽  
Tülin Eker ◽  
Gökhan Sezer ◽  
Adnan Bozdoğan ◽  
Hasan Hüseyin Doğan ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Ganoderma Lucidum ◽  
Methanolic Extract ◽  
Antioxidant Activities ◽  
Reducing Power ◽  
Scavenging Activity ◽  
Phytotoxic Effect ◽  
Dpph Scavenging Activity ◽  
Allelopathic Effects ◽  
Dpph Scavenging

The aim of this study is to reveal allelopathic effects and antioxidant activities of methanolic extract of Ganoderma lucidum in Zorkun plateau (Osmaniye). It was determined that methanolic extract of G. lucidum has significantly phytotoxic effect by increasing the doses (1, 2, 4, 8 mg/mL) on Hordeum vulgare and Triticum aestivum. Total phenol and flavonoid amounts of G. lucidum were 114.55 mg/kg and 8.95 mg/kg, respectively. 2,2-diphenyl-1-picrylhydrazyl (DPPH), scavenging activity (60%, 91% and 92%), reducing power (0.83, 1.43 and 2.23 Abs), and nitric oxide (NO) scavenging activity (48%, 55% and 70%) of this mushroom at the different concentrations (1.25, 2.5 and 5 mg/mL) were determined, respectively. However, H2O2 scavenging activity of the different concentrations (0.0156-0.125 mg/mL) was found as 18%, 56%, 60% and 86%, respectively. Based on these findings, it can suggest that G. lucidum methanolic extract has significantly phytotoxic effect and antioxidant activity. The present study is the first report on the phytotoxic effects and antioxidant activities of G. lucidum which consumed and collected from Amanos Mountains.

scholarly journals Antioxidant activity of Dianthus chinensis flowers processed by ionizing radiation

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Amanda Cristina Ramos Koike
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolics ◽  
Antioxidant Properties ◽  
Reducing Power ◽  
Bioactive Components ◽  
Irradiation Treatment ◽  
Dpph Scavenging Activity ◽  
Dpph Scavenging ◽  
Β Carotene

The edible flowers are increasingly used in culinary preparations, which require new approaches to improve their conservation and safety. Irradiation treatment is safe and an effective alternative for food conservation. Indeed, it can also guarantee food quality, increasing shelf-life and disinfestation of it. This technology gives us a versatile way to get good quality food, reducing post-harvest losses. Dianthus chinensis flowers, popularly known as Chinese pink, are widely used in culinary preparations, being also acknowledged for their bioactive components and antioxidant properties. The purpose of this study was to evaluate the antioxidant activity of D. chinensis flowers submitted to electron beam and gamma irradiation at 0, 0.5, 0.8 and 1 kGy. The antioxidant properties were evaluated through 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity, reducing power and β-carotene bleaching inhibition assays. Total phenolics were also determined by the Folin-Ciocalteu assay. The antioxidant activity was higher for irradiated samples, especially those treated with 0.8 and 1 kGy, independently of the radiation source, which showed the highest capacity to inhibit β-carotene bleaching. Accordingly, the applied irradiation treatments seemed to represent feasible technology to preserve the quality of edible flower petals, being able to improve the antioxidant activity

scholarly journals A Study on Organic Tomatoes: Effect of a Biostimulator on Phytochemical and Antioxidant Activities

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Varinder Sidhu ◽  
Dilip Nandwani ◽  
Li Wang ◽  
Ying Wu
Keyword(s):  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Total Phenolic ◽  
Scavenging Activity ◽  
Treatment Groups ◽  
Significant Difference ◽  
Dpph Scavenging Activity ◽  
Dpph Scavenging

The objective of the present study is to investigate nutritional and antioxidant activity of four types of organic tomato cultivars. The differences in tomato quality are also tested between groups with or without treatment using an organic biostimulator, Stimplex. Total phenolic compounds (TPC), lycopene,β-carotene, DPPH free radical scavenging activity, reducing power, and color parameters were investigated in the current study. The results showed that there was no significant difference in TPC among cultivars regardless of Stimplex treatment. Higher lycopene andβ-carotene were obtained in Stimplex treated tomatoes. Lycopene andβ-carotene contents were significantly different among cultivars (P<0.05). DPPH scavenging activity in controlled group was significantly higher than that in the Stimplex treated tomatoes (P<0.05). No significant difference in reducing power was detected among cultivars treatment groups. The study showed that the darker the tomato color, the higher the lycopene andβ-carotene contents and the stronger the reducing power.

scholarly journals Antioxidant Activities of the Methanol Extracts of Various Parts of Phalaenopsis Orchids with White, Yellow, and Purple Flowers

2018 ◽  
Vol 46 (2) ◽  
pp. 457-465 ◽  
Author(s):  
Hoang Chinh NGUYEN ◽  
Kuan-Hung LIN ◽  
Meng-Yuan HUANG ◽  
Chi-Ming YANG ◽  
Tin-Han SHIH ◽  
...  
Keyword(s):  
Leaf Extract ◽  
Antioxidant Activities ◽  
Reducing Power ◽  
Leaf Extracts ◽  
Flower Extract ◽  
Methanolic Extracts ◽  
Medicinal Use ◽  
Dpph Scavenging Activity ◽  
Reducing Power Assay ◽  
Dpph Scavenging

Phalaenopsis (Phal.) orchids including white, yellow, and purple flowers are some of the most important commercial orchids worldwide. These flowering plants can be considered to be promising sources of antioxidants since several medicinal orchids were shown to have potential antioxidant activities. The antioxidant activities and several secondary metabolite compounds of the methanolic extracts of four parts (the root, pedicel, leaf, and flower) of three hybrids of white (Phal. ‘City More’), yellow (Phal. ‘Sogo Meili’), and purple (Phal. ‘Queen Beer’) flowering orchids were investigated. Results showed that the highest levels of chlorophyll a and chlorophyll b were respectively obtained in leaf extracts of white and purple orchids, whereas carotenoid showed the highest content in the flower extract of the yellow orchid. Among all tested extracts, flavonoids and anthocyanin demonstrated the highest levels in the flower extract of the purple orchid, whereas the highest level of polyphenols was observed in the flower extract of the yellow orchid. The leaf extract of the white orchid was the most effective extract with a 50% inhibitory concentration in the DPPH-scavenging activity assay, while the highest ferrous iron-chelating effect was observed in flower extracts of the yellow orchid and purple orchid, and the pedicel extract of the purple orchid. In the reducing power assay, the flower extract of the white orchid showed the most potent extract, followed by the leaf extract of the yellow orchid and the flower extract of the purple orchid. Relationships between flower colors and antioxidant activities of these orchids showed them to be potential sources of antioxidants for both medicinal use and stress-tolerance in these orchids.

Measurement of Total Phenolics, Antiradical Capacity and Reducing Power of Extracts of Chinese Medicinal Plants

2012 ◽  
Vol 217-219 ◽  
pp. 1002-1005
Author(s):  
Xin Hong Wang
Keyword(s):  
Functional Foods ◽  
Methanol Extract ◽  
Total Phenolics ◽  
Reducing Power ◽  
Ethanol Extract ◽  
Antioxidant Ability ◽  
Ic50 Value ◽  
Chinese Medicinal Plants ◽  
Dpph Scavenging Activity ◽  
Dpph Scavenging

P. cocos, B. ochracea, P. lactiflora, A. dahurica were procured and identified and seperately extracted using water (ethanol, methanol) in the ultrasonic cleaner. TPC, DPPH scavenging ability and reducing power (RP) were determined. The results from this study showed that P. lactiflora had the highest content as 18.62 mg GAE/g dw in ethanol, whereas P. cocos contained only 0.37 mg GAE/g dw in water and P. lactiflora exhibits the highest capacity (68.97%) to reduce DPPH in methanol extract with lowest IC50 value of 1.12 mg dw /ml and 1.14 mg dw /ml in ethanol extract at a concentration of 1.6 mg dw/ml. In RP assay, P. lactiflora had highest FRAP values (37.65 mg AAE/g dw in methanol extract), and P. cocos with least activity 3.25 mg AAE/g dw. The RP value has a apparently positive correlation with TPC and DPPH scavenging activity. TPC is remarkably related to its overall antioxidant ability. P. lactiflora could be selected as an excellent antioxidant for functional foods as well as pharmaceutics.

scholarly journals Effect of Air-Frying on the Bioactive Properties of Eggplant (Solanum melongena L.)

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 435
Author(s):  
Ahmad Mohammad Salamatullah ◽  
Mohammed Asif Ahmed ◽  
Mohammed Saeed Alkaltham ◽  
Khizar Hayat ◽  
Najla Sulaiman Aloumi ◽  
...  
Keyword(s):  
Solanum Melongena ◽  
Reducing Power ◽  
Dry Weight ◽  
Cooking Methods ◽  
Total Polyphenol ◽  
Bioactive Properties ◽  
Different Temperatures ◽  
Dpph Scavenging Activity ◽  
Dpph Scavenging ◽  
Gallic Acid Equivalent

The eggplant is an important vegetable that is used all over the world and it contains valuable bioactive properties. Cooking methods affect the nutritional value as well as the functional characteristics of vegetables. This study investigated the effect of air-frying at different temperatures and the extraction solvents on the bioactive properties of eggplant. The eggplant air-fried for 25 min and extracted with 50% ethanol exhibited the highest total flavonoid content (35.10 mg catechin equivalent per gram dry weight), while its total polyphenol content was found as 87.81 mg gallic acid equivalent per gram dry weight. The uncooked sample exhibited the lowest DPPH scavenging (IC50: 422.12 mg/mL reducing power: 0.914), while the highest DPPH scavenging activity (IC50: 2.87 mg/mL; reducing power: 0.936) was recorded for the sample air-fried for 25 min and extracted with 50% ethanol. The highest amount of tannic acid was found in medium-cooked eggplant, while chlorogenic acid was the highest in the high-cooked sample. These results might be helpful for functional food processors.

scholarly journals Bioactive components, enzymes inhibitory and antioxidant activities of biofortified yellow maize (Zea mays L.) and cowpea (Vigna unguiculata L. Walp) composite biscuits

2021 ◽  
Vol 45 (1) ◽  
pp. 86-101
Author(s):  
Emmanuel Anyachukwu Irondi ◽  
Emmanuel Oladipo Ajani ◽  
Olawale Mashood Aliyu ◽  
Kazeem Koledoye Olatoye ◽  
Hassan Taiye Abdulameed ◽  
...  
Keyword(s):  
Total Phenolics ◽  
Antioxidant Activities ◽  
Reducing Power ◽  
Total Flavonoids ◽  
Bioactive Components ◽  
Total Carotenoids ◽  
Composite Flours ◽  
Dpph Scavenging ◽  
Glucose Formation

This study evaluated the bioactive components, enzymes inhibitory and antioxidant activities of biofortified yellow maize (YM) and cowpea (CP) composite biscuits. Composites of YM and CP, mixed at the ratios of 100:0 (YM); 75:25 (YMCP-1); 50:50 (YMCP-2); 25:75 (YMCP-3) and 0:100 (CP), were used to bake composite biscuits designated YM-B, YMCP-1B, YMCP-2B, YMCP-3B and CP-B, respectively. Refined wheat flour (WT) served as the control biscuit (WT-B). The bioactive components (total carotenoids, total phenolics, tannins, total flavonoids and total saponins), enzymes (pancreatic lipase, α-amylase, α-glucosidase) inhibitory and antioxidant (ABTS*+, DPPH* scavenging and reducing power) activities of the flours and biscuits were determined. Total carotenoids content increased significantly (p < 0.05) with increasing proportion of YM, while total phenolics, tannins, total flavonoids and saponins contents, enzymes inhibitory and antioxidant activities increased with increasing proportion of CP in the composite flours and biscuits. Among the composite biscuits, YMCP-3B had the strongest (p < 0.05) enzymes inhibitory and antioxidant activities. The composite biscuits, especially YMCP-3B, may serve as functional biscuits for retarding the rate of fatty acids and glucose formation, and mitigating oxidative stress, which represent a clinical strategy for managing obesity and type 2 diabetes.

Characterization of non polar-polar solvent extracts from some tea plantation shade tree leaves with special reference to antioxidant and antibacterial activities

2020 ◽  
pp. 15-21
Author(s):  
Arindam Ghosh ◽  
Soumya Majumder ◽  
Sumedha Saha ◽  
Malay Bhattacharya
Keyword(s):  
Cardiac Glycosides ◽  
Polar Solvent ◽  
Reducing Power ◽  
Scavenging Activity ◽  
Shade Trees ◽  
Crude Fibre ◽  
Shade Tree ◽  
Dpph Scavenging Activity ◽  
Dpph Scavenging

Beneficial properties of shade trees of tea plantations other than their medicinal properties have been extensively studied. This research was initiated to explore the properties of some shade trees with special emphasis on their antioxidant and antibacterial properties. Leaves from shade tree like Dalbergia sissoo (DS), Cassia siamea (CS), Derris robusta (DR), Leucaena leucocephala (LL), Acacia lenticularis (AL) and Melia azedarach (MA) were used for the study. Characterization of shade tree leaves by determination of moisture, crude fibre and ash content and tests of non polar – polar solvent extracts for steroid, tannins, cardiac glycosides and coumarin, free radical scavenging, ferric reducing power, NO scavenging activities, quantification of Flavonoids and antibacterial activity were conducted. The average moisture, crude fibre and ash percentage of shade tree plants were found to be 62.95, 11.28 and 1.86 respectively. Methanol, ethanol, acetone and ethyl acetate respectively proved to be the most potent solvent for various phytochemical extractions as it gave positive results for tests like tannin, steroid, cardiac glycosides and coumarin. AL (91.46%), DR (92.69%), LL (94.32%) and MA (93.34%) leaf extracts showed a high level of DPPH scavenging activity in their water extracts. In DS (88.11%) and CS (83.23%) maximum DPPH scavenging activity was observed in Diethyl ether and Methanol extracts respectively.  Acetone extracts were more active than the water extracts in exhibiting ferric reducing power and NO scavenging activity. Summation of the quantity revealed that DS showed maximum presence of flavonoids and acetone as most potential for isolation of flavonoids. The decreasing order of summative antibacterial activity was recorded in DS, followed by CS, DR, AL, MA and LL. Chloroform showed the highest summative inhibition zone followed by ethanol, ethyl acetate, diethyl ether, acetone, water,  hexane, benzene and methanol. The antioxidant and antibacterial potential of shade trees were established.

Chemical Constituents Isolated from Rhododendron ungernii with Antioxidant Profile

2019 ◽  
Vol 9 (3) ◽  
pp. 238-243 ◽  
Author(s):  
Emine Dede ◽  
Nusret Genc ◽  
Mahfuz Elmastas ◽  
Huseyin Aksit ◽  
Ramazan Erenler
Keyword(s):  
Antioxidant Activities ◽  
Biological Activities ◽  
Chemical Constituents ◽  
Reducing Power ◽  
Scavenging Activity ◽  
Isolation And Identification ◽  
Reduced Pressure ◽  
Scavenging Effect ◽  
Pharmaceutical Industries ◽  
Dpph Scavenging

Background: Plant in Rhododendron genus that contains phenolic compounds has been used in traditional medicine and revealed considerable biological activities. Objective: Isolation and identification of antioxidant natural products from Rhododendron ungernii. Methods: Rhododendron ungernii Trautv. flowers were collected and dried in shade. The dried flowers were extracted with methanol for 3 days. The solvent was removed by reduced pressure to yield the extract which was subjected to column chromatography (Sephadex LH-20, C18 reversed phase column) to isolate catechin-7-O-glucoside (1), quercetin-3-O-β-galactoside (2), quercetin-3-O- β-xyloside (3), farrerol (4), myricetin (5), and quercetin (6). The structures of isolated compounds were elucidated by spectroscopic methods such as 1D-NMR, 2D-NMR, and LC-TOF/MS. DPPH scavenging effect, ABTS+ scavenging activity, and reducing power (FRAP) were performed for antioxidant assays of isolated natural compounds. Results: Isolated flavonoids displayed the outstanding antioxidant activities. Catechin-7-O-glucoside (1) and quercetin-3-O-β-galactoside (2) (IC50, 3.66 µg/mL) had the most DPPH• scavenging effect among the compounds. The highest ABTS•+ scavenging activity (IC50, 1.41 µg/mL) and reducing power effect (6.05 mmol TE/g comp) were observed for myricetin (5). Conclusion: R. ungernii extract and isolated compounds could be a promising antioxidant for food and pharmaceutical industries.

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