scholarly journals In vitro Antioxidant Activities of Hydroethanolic Extract of Defatted Wonderful Kola (Buchholzia coriacea) Seeds and Its Safety Evaluation in Murine Models

2020 ◽  
pp. 17-29
Author(s):  
Ayokanmi Ore ◽  
Regina Ngozi Ugbaja ◽  
Abideen Idowu Adeogun ◽  
Oluseyi Adeboye Akinloye
Keyword(s):  
Antioxidant Activity ◽  
Body Weight ◽  
Antioxidant Activities ◽  
Total Phenols ◽  
Limited Information ◽  
Vast Number ◽  
Limit Test ◽  
Hydroethanolic Extract ◽  
In Vitro Antioxidant Activity

Introduction: Buccholzia coriaceaseed possesses a vast number of therapeutic applications in African traditional medicine. However, there are still limited information on its bioactive constituents, pharmacological actions and safety profile. This study was designed to prepare hydroethanolic extract of (defatted) Buccholzia coriacea seeds (HEBCS), evaluate its total phenols and flavonoids, in vitro antioxidant activity and its safety in rats and mice. Methods: Seeds were defatted with hexane and the residue extracted with 80% ethanol (EtOH). The total phenols and flavonoid content of the lyophilised HEBCS was determined followed by in vitro antioxidant activity against stable free radicals (DPPHŸ, ABTSŸ+) and reactive oxygen species (ŸOH, NO and H2O2). Limit test (at 5000 mg/ kg body weight (bw) and acute toxicity test (at doses of 62.5, 125, 250 and 500 mg/kg bw) was carried out in rats followed by sub chronic toxicity study (at doses of 125 and 250 mg/ kg bw) in mice. Biomarkers of hepatic function (ALT, AST, ALP and total bilirubin) and renal function (urea and creatinine) were assessed. Results: The total phenols and flavonoids content of HEBCS was found to be 31.76 μg GAE/ mg and 22.82 μg QE/ mg respectively. The half-maximal inhibitory concentration (IC50) value for HEBCS when tested against DPPHŸ, ABTSŸ+, ŸOH, H2O2 and NO were found to be 257.85, 496.73, 883.68, 475.68 and 1786.42 μg/mL respectively. The Median Lethality Dose (LD50) for HEBCS in rat was greater than 5000 mg/ kg body weight. HEBCS did not show any significant (P = .05) hepatic or renal toxicity. Conclusion: Data obtained from the present study highlight the safety of HEBCS and its potential role as a source of natural antioxidants.

scholarly journals Evaluation of Antioxidant Capacity ofSolanum sessiliflorum(Cubiu) Extract: AnIn VitroAssay

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Diego Rocha de Lucena Herrera Mascato ◽  
Janice B. Monteiro ◽  
Michele M. Passarinho ◽  
Denise Morais Lopes Galeno ◽  
Rubén J. Cruz ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Capacity ◽  
Antioxidant Activities ◽  
Flavonoid Glycosides ◽  
Specific Staining ◽  
Native Populations ◽  
Chemical Groups ◽  
Solanaceae Family ◽  
Hydroethanolic Extract

Cubiu is a vegetable of Solanaceae family, native to the Amazon, which is widely distributed through Brazil, Peru, and Colombia. It is used in food, medicine, and cosmetics by native populations. Research has shown that cubiu extracts have antioxidant activities with great biological relevance. We performed a phytochemical screening to identify the main chemical groups that could confer antioxidant activity to this extract. Several tests and qualitative precipitation specific staining for major classes of secondary metabolites were used. Antioxidant capacityin vitrotests (DPPH and ABTS) were also used to assess the extract’s ability to sequester free radicals of 70% hydroethanolic and aqueous extracts of cubiu flour. Alkaloids, organic acids, phenols, flavonoid glycosides, and coumarins were found in the hydroethanolic extract while the aqueous extract presented anthocyanins, gums, tannins and mucilage, amino groups, and volatile and fixed acids. Forin vitrotests, theIC50value obtained in the DPPH assay was 606.3 ± 3.5 μg/mL while that for the ABTS assay was 290.3 ± 10.7 µg/mL. Although cubiu extracts present chemical compounds directly related to antioxidant activity, our results show that it has a low antioxidant activity. Additional studies will be needed to isolate and characterize specific compounds to further assess antioxidant activity.

One-pot construction of sterically challenging and diverse polyarylphenols via transition-metal-free benzannulation and their potent in vitro antioxidant activity

2017 ◽  
Vol 15 (9) ◽  
pp. 2052-2062 ◽  
Author(s):  
Shizuka Mei Bautista Maezono ◽  
Tej Narayan Poudel ◽  
Yong Rok Lee
Keyword(s):  
Antioxidant Activity ◽  
Transition Metal ◽  
Antioxidant Activities ◽  
One Pot ◽  
Metal Free ◽  
Novel Synthesis ◽  
In Vitro Antioxidant Activity

One pot novel synthesis of highly functionalized polyarylphenols via benzannulation under transition-metal-free conditions and their antioxidant activities are described.

scholarly journals Green Synthesis, Characterization and In-vitro Antioxidant Property of Silver Nanoparticles Using the Aqueous Leaf Extract of Justicia carnea

2021 ◽  
pp. 20-30
Author(s):  
I. O. Salaudeen ◽  
M. O. Olajuwon ◽  
A. B. Ajala ◽  
T. O. Abdulkareem ◽  
S. A. Adeniyi ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Antioxidant Activities ◽  
Silver Ions ◽  
Antioxidant Property ◽  
Biological Macromolecules ◽  
Aqueous Leaf Extract ◽  
In Vitro Antioxidant Activity

This study investigated the synthesis, characterization and in vitro antioxidant activity of silver nanoparticles (AgNPs) using the aqueous leaf extract of Justicia carnea.  The aqueous leaf extract of J. carnea was used as a potential reducing and capping agent. To identify the compounds responsible for the reduction of silver ions, the functional groups present in the plant extract were subjected to FTIR. The in vitro antioxidant activity of synthesized nanoparticles was evaluated in terms of ferric reducing antioxidant potential (FRAP), DPPH (1,1-diphenyl-2-picrylhydrazyl) and ABTS (2,2`-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) free radicals scavenging assays. The surface plasmon resonance confirmed the formation of AgNPs with maximum absorbance at kmax = 446 nm. FTIR revealed the biological macromolecules of J. carnea leaf extract involved in the synthesis and stabilization of AgNPs. UV-Visible spectrophotometer showed absorbance peak in the range of 436-446 nm. The silver nanoparticles exhibited moderate antioxidant activities compared to standard antioxidants (ascorbic acid and BHT). These results confirmed this protocol as simple, eco-friendly, nontoxic and an alternative for conventional physical and chemical methods. It can be concluded that J. carnea leaf extract can be used effectively in the production of potential antioxidant AgNPs which could be useful in various bio-applications such as cosmetics, food and biomedical industry.

Estimation of Total Phenolics and Flavonoid Content and In-vitro Antioxidant Activity of Drypetes sepiaria Stem (Wight and Arn.) Pax and K. Hoffm.

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Packia M. ◽  
Daffodil D. ◽  
Tresina S. ◽  
Mohan R.
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolics ◽  
Antioxidant Activities ◽  
Reducing Power ◽  
Model Systems ◽  
Aluminium Chloride ◽  
Total Phenolic ◽  
Ethanol Extracts ◽  
In Vitro Antioxidant Activity

The total phenolics, flavonoids and in vitro antioxidant activity of petroleum ether, benzene, ethyl acetate, methanol and ethanol extracts of stem of Drypetes sepiaria were determined using various antioxidant model systems viz, DPPH, hydroxyl, superoxide, ABTS and reducing power. Total phenolic content was estimated by Folin-Ciocalteau method. Flavonoids were determined by Aluminium chloride method. The total phenolics and flavonoids contents were found to be 0.81 g 100 g-1 and 1.12g 100 g-1 respectively in the methanol extract. Among the solvent tested, methanol and ethanol extracts of D. sepiaria stem showed potent in vitro antioxidant activities. This investigation explored that D. sepiaria stem is a potential source of natural antioxidant.

Vitamin C in Acerola and Red Plum Extracts: Quantification via HPLC, in Vitro Antioxidant Activity, and Stability of their Gel and Emulsion Formulations

2018 ◽  
Vol 101 (5) ◽  
pp. 1461-1465 ◽  
Author(s):  
Letícia Caramori Cefali ◽  
Ludmila de Oliveira Maia ◽  
Rebeca Stahlschimidt ◽  
Janaína Artem Ataide ◽  
Elias Basile Tambourgi ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radicals ◽  
Vitamin C ◽  
Antioxidant Activities ◽  
Accelerated Aging ◽  
Stability Study ◽  
Transparent Glass ◽  
Glass Containers ◽  
In Vitro Antioxidant Activity

Abstract Background: The fruits acerola and red plum are known to be good sources of antioxidants, particularly vitamin C. Antioxidants are compounds that protect organisms from biomolecular damage, such as accelerated aging, caused by free radicals. Objective: The objective of this study was to extract vitamin C from acerola and red plum, incorporate these extracts into different topical formulations, and evaluate the physicochemical stabilities of these formulations under stress conditions. Methods: Vitamin C was extracted from acerola and red plum via dynamic maceration for 2 h at 50 ± 2°C and was quantified via HPLC. In vitro antioxidant activities were evaluated using DPPH assays. The extracts were then incorporated into emulsion and gel formulations in two types of packaging, and stability studies were carried out. Results: Red plum and acerola extracts were orange and red and contained vitamin C concentrations of 2732.70 ± 93.01 mg/100 g and 2.60 ± 1.2 mg/100 g, respectively. In vitro antioxidant activity resulted in over 90.0% inhibition of free radicals at 0.01 mL/mL acerola extract and 0.1 mL/mL red plum extract. In the stability study, pH values decreased for both acerola formulations when stored in the oven or in transparent glass containers. Formulations containing red plum extract were stable under all conditions. Acerola extracts contained a higher concentration of vitamin C than red plum extracts. Both extracts possessed antioxidant activity, although the acerola-based formulation was unstable when stored at high temperatures or in transparent glass containers. Highlights: Extracts from red plum and acerola contained vitamin C; antioxidant activity of the extracts resulted in over 90.0% inhibition of free radicals. Formulations containing red plum were stable under all tested conditions, and formulations containing acerola were unstable when stored in the oven or in transparent glass containers.

Stability of phenolic content of some herbal infusions and their antioxidant activity following in vitro digestion

2017 ◽  
Vol 42 (4) ◽  
Author(s):  
Engin Celep ◽  
Selin Akyuz ◽  
Yigit İnan ◽  
Erdem Yesilada
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Content ◽  
Antioxidant Activities ◽  
In Vitro Digestion ◽  
In Vitro Studies ◽  
Vast Number ◽  
The World ◽  
The Stability ◽  
Herbal Infusions

Abstract:Herbal infusions are among the most widely consumed beverages throughout the world. Their popularity arises due to not only their pleasant aroma and taste, but also their high phenolic content and antioxidant activity. A vast number of in vitro studies revealed their high phenolic content, together with strong antioxidant activity. However, the majority of them seem to ignore some important physiological parameters, such as bioavailability or bioaccessibility. The present study was planned to evaluate the stability of phenolic content and antioxidant activities of seven most widely preferred herbal infusions. A stimulated version of gastrointestinal infusion was added to the study for comparative purposes. The results indicated the loss of both phenolic content and antioxidant activity of herbal infusions after being submitted to digestion.

scholarly journals Antioxidant activity and hypoglycemic effect assessment of the leaves from Syzygium cumini (L.) Skeels in Wistar rats

2021 ◽  
Vol 43 ◽  
pp. e52931
Author(s):  
Leise Nascimento Moreira ◽  
Jymmys Lopes dos Santos ◽  
Lúcio Marques Vieira Souza ◽  
Anderson Carlos Marçal ◽  
Antônio Santos Dias ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Folk Medicine ◽  
Climatic Conditions ◽  
Total Phenol Content ◽  
Syzygium Cumini ◽  
Bonferroni Test ◽  
Hypoglycemic Action ◽  
Hydroethanolic Extract ◽  
In Vitro Antioxidant Activity

Syzygium cumini (L.) Skeels was adapted to the climatic conditions and soil types in Brazil. Its fruits, leaves and inner bark are used in folk medicine due to their high antioxidant, anti-inflammatory, anticarcinogenic and antidiabetic activities mainly associated with the presence of phenolic compounds. It is estimated that at least 300 million people worldwide develop diabetes and approximately 11 million people are carriers of the disease in Brazil. The objective of this work was to evaluate the in vitro antioxidant activity, as well as the hypoglycemic action of hydroethanolic extract (HEE), the ethyl acetate (EAF) and hydromethanolic (HMF) fractions from leaves of S. cumini (L.) Skeels in rats. All assays were carried out in three replications. Data were expressed as mean ± SD and significance was evaluated by ANOVA and Bonferroni test (p < 0.05). The results indicate a significant (p < 0.05) total phenol content (207 ± 2.3 GAE mg g-1) and antioxidant activity (EC50 = 9.05 ± 0.170 µg mL-1) for EAF. HEE and its fractions showed no significant (p > 0.05) action to modulate glucose by the OGTT assay in nondiabetic mice compared to control. Thus the use of the plant against diabetes in individuals is not proven.

Antioxidant Components and Antioxidant Activities of Hydroglyceroalcoholic Extract from Fresh Mushroom Mycelium

2017 ◽  
Vol 68 (3) ◽  
pp. 534-540
Author(s):  
Emanuel Vamanu
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Phenolic Acid ◽  
Antioxidant Activities ◽  
Submerged Cultivation ◽  
Active Components ◽  
Gentisic Acid ◽  
Polyphenolic Acids ◽  
In Vitro Antioxidant Activity

The in vitro antioxidant activity, as well as the hydroglyceroalcoholic extracts main active components from mycelia of Pleurotus ostreatus and Coprinus comatus, were determined. The mycelium submitted for extraction was obtained by submerged cultivation in a bioreactor. The hydroglyceroalcoholic extracts, in particular, those of P. ostreatus PSI101109 and PQMZ91109 mycelium had a considerable antioxidant activity, and was compared to the overall constituent of flavonoids plus phenolic compounds. According to the extracts HPLC assessment, the key phenolic acid evident from the extracts was gentisic acid. The homogentisic, gallic and protocatechuic acids were also determined. Catechin was identified as well, except for C. comatus M8102 and P. ostreatus PBS281009 mycelia extracts. Since catechol and gentisic acid levels were high, respectively, there was a correlation with the absence of carotenoid compounds in hydroglyceroalcoholic extracts (P. ostreatus PSI101109). There is a correspondence between the hydroglyceroalcoholic extracts� key antioxidant activities with the catechin and polyphenolic acids levels identified in each extract.

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