scholarly journals Evaluation of the Antioxidant Activity of Ethanolic Extracts of Some Varieties of Onions

2014 ◽  
Vol 03 (02) ◽  
pp. 26-34
Author(s):  
María del Carmen Gutierrez ◽  
Patricia Della Rocca ◽  
Elizabeth De Seta ◽  
Fernando Reina
Keyword(s):  
Antioxidant Activity ◽  
Ethanolic Extracts

scholarly journals Utero-relaxing and anti-free-radical effects of hydro-ethanolic extracts of Desmodium ramosissimum in the wistar female rats

2021 ◽  
Vol 2 ◽  
pp. 6
Author(s):  
Hèzouwè Madjalani ◽  
Kossi Metowogo ◽  
Tcha Pakoussi ◽  
Aklesso Nabede ◽  
Essodjolon Kanabiya ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Medicinal Plants ◽  
Rural Areas ◽  
Public Health Problem ◽  
Stem Bark ◽  
Sub Saharan Africa ◽  
Female Rats ◽  
Phenolic Constituents ◽  
Ethanolic Extracts

Objectives: In sub-Saharan Africa, the therapeutic use of medicinal plants is of arousing interest. Reproductive disorders are a public health problem like everywhere else in the world. The population, especially in rural areas, uses medicinal plants for their beneficial effects. In Africa, the population uses these medicinal plants for their healthcare, including solving problems related to childbirth where there is an increase in the number of women known as “traditional birth attendants.” The effects of its medicinal plants relate to the various reproductive processes in women, from pregnancy to induction of labor, elimination of placental retention, and management of postpartum hemorrhage. To contribute to the enhancement of medicinal plants traditionally used in reproductive healthcare in Togo and to make information on their pharmacological effects available to the population, this work focused on the evaluation utero-relaxing and anti-free radical effects of extracts of Desmodium ramosissimum in the female rats of the Wistar strain. Material and Methods: The effects of hydro-ethanolic extracts of leaves, stem barks, and roots of D.ramosissimum were then tested on shreds Myometer of the female rats mounted in an organ vat and the antioxidant activity of these extracts tested was then determined. Results: The results show that hydro-ethanolic extracts from leaves, stem bark, and roots of D.ramosissimum cause a reduction in the frequency of spontaneous contractions of the uterine muscle. This reduction shows that these extracts have relaxing effects on the contraction of this muscle. The leaves extract showed better antioxidant activity compared to other extracts. Conclusion: This antioxidant activity is probably due to the phenolic constituents and its metabolites would be partly responsible for the pharmacological activities of D.ramosissimum. D.ramosissimum could thus be used to reduce uterine contractions in order to avoid Threats of Premature Labor.

scholarly journals Prunus persica var. platycarpa (Tabacchiera Peach): Bioactive Compounds and Antioxidant Activity of Pulp, Peel and Seed Ethanolic Extracts

2015 ◽  
Vol 70 (3) ◽  
pp. 331-337 ◽  
Author(s):  
Monica R. Loizzo ◽  
Deborah Pacetti ◽  
Paolo Lucci ◽  
Oscar Núñez ◽  
Francesco Menichini ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Prunus Persica ◽  
Ethanolic Extracts

Mycochemical composition and antioxidant potential of Macrolepiota africana (Heim) Heinem. (Agaricaceae), an edible mushroom from Gabon

2021 ◽  
Vol 2 (1) ◽  
pp. 028-033
Author(s):  
Hugues Calixte Eyi Ndong ◽  
André Ledoux Njouonkou
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Activity Index ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Edible Mushroom ◽  
Mushroom Species ◽  
Chemical Screening ◽  
Ethanolic Extracts ◽  
Pharmacological Potential

Macrolepiota africana is a fungus used as food in Gabon for its culinary properties. However, its nutritional value, mycochemical contents, antioxidant properties and health potential still unknown. The present study investigated the phytochemicals and antioxidant properties of this mushroom species. This chemical screening was followed by a study of the antioxidant activity and a prediction of additional pharmacological activities of M. africana. Using standard methodology, the mycochemical analyses were carried out on aqueous, hydro-ethanolic and ethanolic fungi extracts. The antioxidant activity of the mushroom extracts was determined using DPPH radical scavenging assay. Apart from Digitoxigenine, flavonol and gitoxigenine that were not found in any of the extracts, all other tested mycochemical were found in atleast one of the extracts. Alkaloids, flavonoids, polyphenols, oses and holosides, proanthocyanidins and coumarins were found in all extracts at different intensity. Saponosids, sterols and triterpenes, tannins gallics, reducing sugar, anthracenosides and digitoxine were found in two extracts while tannins catechics, flavone and gitoxine were detected only in one extract. The dosage of phenolic compounds confirmed the richness of this fungus in total polyphenols, its moderate richness in proanthocyanidins, the lack of flavonoids in the aqueous extract and the moderate richness of the hydro-ethanolic and ethanolic extracts in flavonoids. Regarding the antioxidant activities, the results obtained for the DPPH trapping test showed that the different extracts had low to moderate antioxidant activity with antioxidant activity index (IAA) ranged 0.29 to 0.97 respectively in aqueous and ethanolic extracts. The presence of these mycochemical compounds along with the identified antioxidant activities shows that this M. africana have some pharmacological potential.

scholarly journals Chemical Fingerprint Analysis of Phenolics of Albizia chinensis Based on Ultra-Performance LC-Electrospray Ionization-Quadrupole Time-of-Flight Mass Spectrometry and Antioxidant Activity

2011 ◽  
Vol 6 (11) ◽  
pp. 1934578X1100601 ◽  
Author(s):  
Abha Chaudhary ◽  
Pushpinder Kaur ◽  
Neeraj Kumar ◽  
Bikram Singh ◽  
Shiv Awasthi ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Antioxidant Activity ◽  
Electrospray Ionization ◽  
Time Of Flight ◽  
Ethanolic Extract ◽  
Ultra Performance Liquid Chromatography ◽  
Reversed Phase ◽  
Flight Mass Spectrometry ◽  
Ethanolic Extracts ◽  
C Nmr

Albizia species have been shown to have anti-inflammatory and antiallergic properties. However, efficient analytical methods for identification of their active constituents are still lacking. Ultra-performance liquid chromatography coupled with electrospray ionization-quadrupole time-of-flight mass spectrometry (UPLC-ESI-QTOF-MS) was used to study the phenolic composition of the ethanolic extracts of different parts (flowers, leaves, pods and bark) of A. chinensis. In addition, the antioxidant activity of the ethanolic extracts was evaluated by the 1,1-diphenyl-2-picryl hydrazyl (DPPH) free-radical and 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid (ABTS) radical cation scavenging methods. Four compounds were isolated from the ethanolic extract of the flowers and characterized by 1H and 13C NMR spectroscopy as quercetin-3- O-rhamnoside, quercetin, quercetin-3- O-arabinofuranoside, and myricetin-3- O-rhamnoside. Separation and quantification of the phenolics was accomplished using a reversed-phase BEH C18 column with the mobile phase of methanol–water (0.05% formic acid), and detection wavelengths of 360 and 254 nm.

Evaluation of Phytochemicals and Pharmacological Activities of Ben-Cha-Lo-Ka-Wi-Chian Remedy

2019 ◽  
Vol 891 ◽  
pp. 52-59
Author(s):  
Chanai Noysang ◽  
Teerarat Pummarin
Keyword(s):  
Antioxidant Activity ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Propionibacterium Acnes ◽  
Ethanolic Extract ◽  
Inhibition Zone ◽  
Inhibitory Effect ◽  
Pharmacological Activities ◽  
Ethanolic Extracts ◽  
Reaction Test

Benchalokawichian (BLW) remedy is a Thai traditional medicine that has been notified in the List of Medicine Products of the National List of Essential Drugs A.D. 2006 and has long been used as an antipyretic. The phytochemicals of the 70% and 95% ethanolic extracts of were studied by color reaction test and HPTLC analysis. The BLW remedy showed a highest amounts of 70% ethanolic extractives (ca. 3.99 ± 0.60% of dry material weight). The several ethanolic extracts showed similar qualitative phytochemicals. The major of phytochemicals identified in these extracts were alkaloids, flavonoids, tannins, and polyphenols. The antioxidant activity was assessed using the 2,2-diphenyl-1-picrylhydrazyl assay. The analysed 70% ethanolic extract showed a highest antioxidant activity at IC50= 526.09 µg/ml and both extracts not showed tyrosinase inhibitory effect. The 95% ethanolic extract showed the greatest anti-propionibacterium acnes activity with inhibition zone of 10.10 ± 0.45 mm and minimum inhibitory concentration (MIC) was 5.05 mg/ml

Preliminary Phytochemicals and Pharmacologic Activities Assessment of White and Pink Nelumbo nucifera Gaertn. Flowers

2019 ◽  
Vol 891 ◽  
pp. 41-51
Author(s):  
Chanai Noysang ◽  
Nutsuda Boonmatit
Keyword(s):  
Antioxidant Activity ◽  
Ethanolic Extract ◽  
Inhibitory Effect ◽  
White Flower ◽  
Nelumbo Nucifera ◽  
Color Reaction ◽  
Natural Source ◽  
Pink Flower ◽  
Ethanolic Extracts ◽  
Reaction Test

The phytochemicals of the ethanolic extracts of petals and stamens of lotus flowers from several lotus cultivars belonging to the Nelumbo nucifera Gaertn. (namely 'lotus white flower' and 'lotus pink flower') were studied by color reaction test and HPTLC analysis. The lotus pink flower stamens showed a highest amount of ethanolic extractives (ca. 18.33±2.14% of dry material weight). The several the ethanolic extracts of N. nucifera petals and stamens showed similar qualitative phytochemicals. The crude extracts revealed the presence of flavonoids, terpenoinds, tannins and polyphenols. The antioxidant activity was assessed using the 2,2-diphenyl-1-picrylhydrazyl assay. The analyzed lotus pink flower stamens ethanolic extract showed a highest antioxidant activity at IC50 = 0.61±0.16 μg/ml and lotus pink flower petals ethanolic extract showed a highest tyrosinase inhibitory effect at IC50 = 2.25±0.21 μg/ml. N. nucifera flowers could be provide a potential natural source of phytochemicals and could be beneficial to the cosmetic properties.

scholarly journals Aronia melanocarpa Fruit and Leaves Hot-Assisted Ethanolic Extracts Antioxidant Activity

Proceedings ◽  
2020 ◽  
Vol 57 (1) ◽  
pp. 57
Author(s):  
Andrei Munteanu ◽  
Alin Enache ◽  
Georgeta Neagu ◽  
Corina Bubueanu ◽  
Alice Grigore ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Quinic Acid ◽  
Antioxidant Compounds ◽  
Total Phenols ◽  
Aronia Melanocarpa ◽  
Fresh Material ◽  
Ethanolic Extracts ◽  
Black Chokeberry ◽  
Caffeoyl Quinic Acid

Aronia melanocarpa L. fruit (common black chokeberry) is one of the most abundant sources of antioxidant compounds in the plant world, superior to all edible fruits; chokeberry fruits contain up to 100 g total phenols per kg fresh material, predominantly (−)epicatechin, cyanidin-3-glycosides and procyanidins (60%), added to quercetin and caffeoyl quinic acid derivates.

Antioxidant Activity Increase in Heating Oilseed Protein Ingredients with Glucose1

1982 ◽  
Vol 45 (5) ◽  
pp. 452-454 ◽  
Author(s):  
KI SOON RHEE ◽  
KHEE CHOON RHEE
Keyword(s):  
Antioxidant Activity ◽  
Food Systems ◽  
Heating Time ◽  
Reducing Sugar ◽  
Model Systems ◽  
Oilseed Protein ◽  
Activity Increase ◽  
Rate Of Increase ◽  
Nonenzymatic Browning ◽  
Ethanolic Extracts

Protein ingredients prepared from glandless cottonseed, peanut and soybean show varying degrees of antioxidative effectiveness in model systems and in food systems. This paper presents data showing that nonenzymatic browning between oilseed protein ingredients and a reducing sugar can enhance the antioxidant value of oilseed ingredients. Defatted flours and protein isolates of the oilseeds were mixed with glucose in a ratio of 1:1 by weight and heated at 100 C for 2 and 6 h. Antioxidant activity of ethanolic extracts of the mixtures was determined against autoxidation of safflower oil. Antioxidant activity of the mixtures increased with heating time, as did the extent of nonenzymatic browning. The rate of increase in antioxidant activity was greater for mixtures having lower endogenous (0 h) antioxidant activity.

scholarly journals Effect of cooking temperature and time on total phenolic content, total flavonoid content and total in vitro antioxidant activity of garlic

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Thandiwe Alide ◽  
Phanice Wangila ◽  
Ambrose Kiprop
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Flavonoid ◽  
Total Phenolic ◽  
Total Flavonoid Content ◽  
Flavonoid Content ◽  
Cooking Temperature ◽  
Ethanolic Extracts ◽  
The Mean

Abstract Objective To investigate the effect of cooking temperature and time on the total phenolic content, total flavonoid content and antioxidant activity of aqueous and ethanolic extracts of garlic. Results The mean total phenolic content of fresh garlic were 303.07 ± 6.58 mg gallic acid equivalent per 100 g (GAE/100 g) and 638.96 ± 15.30 mg GAE/100 g of plant material for the aqueous and ethanolic extracts respectively. The mean total flavonoid content 109.78 ± 6.78 mg quercetin equivalent per 100 g (QE/100 g) and 258.47 ± 12.37 QE/100 g for aqueous and ethanolic extracts respectively. Fourier transform infrared spectral data showed absorptions in the range for carboxylic acids, hydroxyl group, esters, and alcohols, confirming the presence of phenols and flavonoids in the extracts. Cooking temperature had a significant effect on total phenolic content and total flavonoid content while cooking time did not have a significant effect on the phytochemicals and antioxidant activity.

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