scholarly journals Tunisian inland water microflora as a source of phycobiliproteins and biological activity with beneficial effects on human health

2021 ◽  
Vol 50 (4) ◽  
pp. 385-397
Author(s):  
Khaled Gharbi ◽  
Afef Fathalli ◽  
Rym Essid ◽  
Chiheb Fassatoui ◽  
Mohamed Salah Romdhane ◽  
...  
Keyword(s):  
Leishmania Major ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Production Capacity ◽  
Value Added ◽  
Cylindrospermopsis Raciborskii ◽  
Alternative Source ◽  
Inland Water ◽  
Methanolic Extracts

Abstract Ten monoclonal microalgal cultures were obtained from several Tunisian inland water bodies, and their dichloromethane and methanolic extracts were screened for antibacterial, antileishmanial, and antioxidant properties, as well as phycobiliprotein production capacity. Cylindrospermopsis raciborskii has been shown to synthesize high levels of phycocyanin and may be an effective alternative source to other sources used for commercial production of phycocyanin. Chroococcus sp. and Leptolyngbya sp1. exhibited the strongest radical scavenging activity against DPPH (IC50 = 212.15 and 263.91 μg ml−1, respectively), indicating their promising potential for use as new effective and non-toxic antioxidants. Furthermore, Dunaliella sp. showed an interesting antileishmanial activity against the pathogens Leishmania infantum and Leishmania major (IC50 = 151 and 284 μg ml−1, respectively), thus representing a good candidate for use against cutaneous and visceral leishmaniasis in Tunisia, a country endemic to these diseases where thousands of new cases are registered every year. These results suggest that the strains of microalgae featured in this work have the potential to serve as natural alternative, safe and sustainable sources of high value-added products that could be used to improve the final biomass value.

scholarly journals Comparative Analysis of a few Indian Medicinal Plants for their Antimicrobial and Antioxidant Properties

2020 ◽  
pp. 73-79
Author(s):  
Kiran Kumar D. J. ◽  
Bhanupriya H. J.
Keyword(s):  
Comparative Analysis ◽  
Medicinal Plants ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Centella Asiatica ◽  
Mentha Piperita ◽  
Diffusion Method ◽  
Methanolic Extracts ◽  
Bauhinia Purpurea

Plant-derived substances have been used since antiquity for therapeutic and other purposes. The present study was undertaken to make a comparative analysis of antimicrobial and antioxidant properties of 8 medicinal plants, which are used in traditional medicine system. Methanolic extracts of Centella asiatica (leaves), Mentha piperita (leaves), Calotropis gigantean (leaves), Vitex nigundo (leaves), Bauhinia racemosus (leaves), Emblica officinalis (fruit), Bauhinia purpurea (leaves), Asperagus racemosus (stem) were tested for anti-microbial effects using the standard Agar Diffusion method. Antioxidant attributes of above extracts were studied by testing their ability to scavenge DPPH and ABTS radicles. Our results indicated that all tested extracts, with the exception of Bauhinia purpurea, were effective against E. Coli, while Candida albicans was only sensitive to Asperagus racemosus. Among tested extracts, Bauhinia racemosus was most potent in exhibiting radical scavenging activity. Our data provides rationale for exploitation of these plants for antimicrobial and antioxidant attributes.

scholarly journals Bio-Prospecting of a Few Brown Seaweeds for Their Cytotoxic and Antioxidant Activities

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Rashmi C. Vinayak ◽  
A. S. Sabu ◽  
Anil Chatterji
Keyword(s):  
Metal Ion ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Total Phenolic ◽  
Antioxidant Compounds ◽  
Brown Seaweeds ◽  
Methanolic Extracts

Methanolic extracts (MEs) of seven brown seaweeds occurring in the Indian coastal waters were screened for their cytotoxic and antioxidant properties following various assays. The methanolic extracts of seaweeds in the order ofDictyopteris australis > Spatoglossum variabile > Stoechospermum marginatum > Spatoglossum aspermumshowed significant cytotoxic activity. A very high DPPH radical scavenging activity was exhibited by the methanolic extracts prepared fromSt. marginatum, Padina tetrastromatica, Dictyopteris delicatulaandS. aspermum. The total phenolic content of the MEs varied from 13.19 ± 0.32 to 25.29 ± 0.445 gallic acid equivalents (mg g−1of methanolic extract). The reducing power assay indicated a dose dependency, at concentrations of 0.1, 0.5 and 1.0 and 2.0 mg mL−1of MEs and decreased in the following order:Butylated hydroxy toluene > P. tetrastromatica > D. delicatula > S. aspermum > S. variabile > S. marginatum > D. australis > S. marginatum. Furthermore,D. australis,S. aspermum, S. variabileandS. marginatumdemonstrated good metal ion chelating properties. All the above evidences suggest that, the antioxidant compounds found in brown seaweeds scavenge free radicals through effective intervention. This decisively promotes them as a potential source of natural antioxidants.

scholarly journals Nutritional Composition and Phytochemical, Antioxidative, and Antifungal Activities ofPergularia tomentosaL.

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Imen Lahmar ◽  
Hafedh Belghith ◽  
Ferjani Ben Abdallah ◽  
Karima Belghith
Keyword(s):  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Nutritional Composition ◽  
Total Phenolic ◽  
Natural Material ◽  
Leaf Extracts ◽  
Methanolic Extracts

Crude extracts from a medicinal Tunisian plant,Pergularia tomentosaL., were the investigated natural material. Butanolic extract of roots analyzed with IR spectra revealed the presence of hydroxyl, alcoholic, and carboxylic groups and sugars units. Analysis of some secondary metabolites, total phenolic, flavonoids, flavonols, and procyanidins, was performed using different solvents following the increased gradient of polarity. Fruits and leaves contained the highest amounts of all these compounds. Antioxidant properties were evaluated by the determination of free radical scavenging activity and the reducing power of methanolic extracts. Fruits and leaf extracts were the most powerful antioxidants for the two-assay in vitro system. Stems and fruits extracts exhibit an antifungal activity againstFusarium oxysporum f. sp. lycopersiciwhich could become an alternative to synthetic fungicide to controlSolanumspecies fungal diseases.

scholarly journals Pharmacological Evaluation of Lavandula stoechas L. for Ethanol-induced Gastric Mucosal Ulcer

2020 ◽  
Vol 8 (1) ◽  
pp. 47-57
Author(s):  
Muhammad Ahsan Javed ◽  
Mahtab Ahmad Khan ◽  
Haroon Arshad ◽  
Nazia Aslam ◽  
Azeem Ahmed Iqbal ◽  
...  
Keyword(s):  
Radical Scavenging Activity ◽  
Healing Process ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Histological Evaluation ◽  
Peptic Ulcers ◽  
Methanolic Extracts ◽  
Lavandula Stoechas ◽  
Mucosal Cells ◽  
Ulcer Model

Background: The constituents of Lavandula stoechas L. possess antioxidant properties that help in protecting the mucosal cells from oxidative damage and speed up the healing process however, its role in the treatment of ethanol-induced peptic ulcers is not clear. Objectives: We aimed to evaluate the pharmacological potential of Lavandula stoechas L. extracts for anti-ulcer activity, and compare with the standard drugs and to explore novel treatment for peptic ulcer. Methods: We evaluated anti-ulcer potential of plant extract in ethanol-induced ulcer model in rats. Omeprazole and ranitidine were standard drugs. After 5 h of disease induction, animals were sacrificed to get tissues for histological evaluation and ulcer index was measured. While the antimicrobial potential of Lavandula stoechas L. aqueous and methanolic extracts was evaluated against different bacterial stains using standard antibiotic discs. Qualitative phytochemical and GCMS analysis were performed to identify novel constituents. Results: The methanolic extract of Lavandula stoechas L. showed antimicrobial activity against Proteus Mirabilis while the GCMS based analysis revealed the presence of 10 phytochemicals including camphor (antimicrobial agent). The aqueous extract showed significant anti-ulcer activity in ethanol-induced gastric (P < 0.001) and duodenal (P < 0.01) ulcers when compared with controls. Aqueous and methanolic Lavandula stoechas L. extracts showed strong free radical scavenging activity. Conclusion: Lavandula stoechas L. extract possess antimicrobial and anti-ulcer activity in alcohol-induced ulcer model in experimental animals.

scholarly journals Antioxidant properties of extracts and SPE fractions from Annona muricata leaves

Food Research ◽  
2020 ◽  
Vol 4 (S2) ◽  
pp. 71-75
Author(s):  
N.A. Hashim ◽  
H. Ya'akob ◽  
M.N.M. Rosdi ◽  
N.A. Zainol ◽  
F. Husin ◽  
...  
Keyword(s):  
Crude Extract ◽  
Solid Phase ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Scavenging Activity ◽  
Annona Muricata ◽  
Aqueous Methanol ◽  
Tropical Plant ◽  
Methanolic Extracts

Annona muricata L. (Magnoliales: Annonaceae) is a tropical plant species known for its edible fruit and well known for the medicinal value. In this study, the antioxidant properties of A. muricata leaves is evaluated for different extracts and fractions. The airdried leaves of A. muricata leaves were successively extracted with n-hexane and methanol. The methanolic crude extract was further semi-purified by utilizing solid-phase extraction (SPE) in a mixture of mobile phase aqueous: methanol to methanol and resulted in four semi-purified fractions (ALM 1 – ALM 4). Antioxidant properties of extracts and fractions were evaluated by free radical scavenging activity against 1,1-Diphenyl-2- picrylhydrazyl (DPPH) radicals comparing with standard ascorbic acid, quercetin, and catechin. Results indicated that methanolic extracts showed exceptionally higher radical scavenging activity compared with n-hexane crude extract with IC50 44.21 µg/mL and 302.41 µg/mL, respectively. Meanwhile, fractions ALM 2 (aqueous: methanol; 50: 50) exhibited the highest scavenging activity with the IC50 of 12.46 µg/mL followed by ALM 1 (aqueous: methanol; 80: 20) with 51.44 µg/mL, ALM 3 (aqueous: methanol; 20: 80) with 54.39 µg/mL and ALM 4 (100% methanol) with 89.02 µg/mL, respectively. In conclusion, ALM 2 could be potentially applied as a natural antioxidant agent in both food, nutraceuticals or pharmaceuticals fields for health promotion. However, ALM 2 has to be further purified to study the constituents which possibly condensed mainly with phenolic and flavonoids that known to possess the highest antioxidant effects.

Antioxidant activity of cookiessupplemented with sugarbeet dietary fiber

2011 ◽  
pp. 151-157 ◽  
Author(s):  
Marijana B. Saka ◽  
Julianna F. Gyura ◽  
Aleksandra Mišan ◽  
Zita I. Šereš ◽  
Biljana S. Pajin ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Shelf Life ◽  
Dietary Fiber ◽  
Wheat Flour ◽  
Room Temperature ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Functional Characteristics

The antioxidant activity of cookies prepared by the addition of sugarbeet dietary fibers was investigated in order to estimate their influence on functional characteristics and shelf-life of cookies. Treated fiber (TF) was obtained from sugarbeet by extraction with sulfurous acid (75 °C at pH = 5.7during 60 min) and treatment with hydrogen peroxide (20 g/LH2O2 at pH = 11 during 24 h). The fiber obtained was dried (80 °C), ground and sieved. TF was investigated in comparison with commercially available Fibrex®. The cookies were prepared by the addition of 0, 7, 9 and 11% of sugarbeet dietary fiber as a substitute for wheat flour in the formulation of cookies. The antioxidant properties of cookies were tested every 7 days using a DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging activity test during 6 weeks of storage at room temperature (23 ± 1 ºC). The obtained results indicated that substitution of wheat flour with Fibrex® in the formulation of cookies upgraded the antioxidant activity, i.e. the functional characteristics of Fibrex®-enriched cookies and could prolong their shelf-life. In contrast, TF did not increase the antioxidant activity of TF-enriched cookies. The better antioxidant activities of Fibrex®-enriched cookies could be attributed to the presence of ferulic acid.

Chemical variability and antioxidant activities of the essential oils of the aerial parts of Ammoides verticillata and the roots of Carthamus caeruleus and their synergistic effect in combination

2020 ◽  
Vol 23 ◽  
Author(s):  
Imane Rihab Mami ◽  
Noria Merad-Boussalah ◽  
Mohammed El Amine Dib ◽  
Boufeldja Tabti ◽  
Jean Costa ◽  
...  
Keyword(s):  
Essential Oil ◽  
Essential Oils ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Natural Food ◽  
Chemical Compositions ◽  
Chemical Variability ◽  
Ammoides Verticillata

Aim and Objective: Oxidative stress is implicated in the development and progression of many disease. Some of appropriate actions that could be initiated to taken to resolve the problem of these diseases are search for new antioxidant substances isolated from plants. The aims of this study were to study the intraspecies variations of A. verticillata and C. caeruleus essential oils from 8 locations using statistical analysis, the in vitro antioxidant properties of collective essential oils and in combinations. Materials and Methods: The essential oils were analyzed by GC and GC-MS. The intraspecies variations of the essential oil compositions were discussed using principal component analysis (PCA) and cluster analysis (CA). The antioxidant properties were evaluated DPPH-radical scavenging activity and β-carotene bleaching test. Results: The main components of Ammoides verticillata collective essential oil (Coll EO) were thymol (30.5%), carvacrol (23.2%), p-cymene (13.1%), limonene (12.5%) and terpinene-4-ol (12.3%). While roots of Carthamus caeruleus essential oil were dominated by carline oxide (86.2%). The chemical variability allowed the discrimination of two main Groups for both Coll EOs. A direct correlation between the altitudes, climate and the chemical compositions was evidenced. Ammoides verticulata and Carthamus caeruleus Coll Eos showed good antioxidant activity. In binary mixture, the interaction both Coll Eos and between oils rich of thymol and/or carvacrol with carlina oxide produced the best synergistic effects, compared to individual essential oils and the synthetic antioxidant (BHT). Conclusion: Ammoides verticillata and Carthamus caeruleus essential oil blends can be used as a natural food preservative and alternative to chemical antioxidants.

Ultraviolet blocking and antioxidant polyvinyl alcohol films incorporated with baicalin extraction from Scutellaria baicalensis Georgi

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jinshu Liu ◽  
Xiaoyan Ma ◽  
Wenzhao Shi ◽  
Jianwei Xing ◽  
Chaoqun Ma ◽  
...  
Keyword(s):  
Water Vapor ◽  
Polyvinyl Alcohol ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Water Vapor Permeability ◽  
Scutellaria Baicalensis ◽  
Vapor Permeability ◽  
Protective Film ◽  
Uv Blocking

Abstract Baicalin, an active flavonoid ingredient of Scutellaria baicalensis Georgi, was extracted by heat reflux extraction and showed the same significance UV absorption property with standard baicalin. Active films were prepared from polyvinyl alcohol (PVA) containing baicalin extract by casting method. The effect of baicalin extracts on the UV-blocking, optical, antioxidant property, water vapor permeability, swelling and mechanical properties of the films were studied. UV–vis transmittance spectra showed that PVA films incorporated with baicalin extract blocked ultraviolet light range from 280–400 nm even with low concentration of baicalin (0.5 wt%) and maintain the high transparency in visible spectrum. The outstanding UV-blocking properties of PVA films incorporated with baicalin extract were also confirmed by Rhodamine B degradation. Baicalin conferred antioxidant properties to PVA films as determined by DPPH radical scavenging activity. Due to the interaction between hydroxy groups of baicalin and PVA molecule, water vapor permeability, swelling and elongation at break of the films were decreased accompanied with the increasing in tensile strength and Young’s modulus. FTIR reveal that the interaction between PVA molecules was significant changed by the introduction of baicalin. These results suggest that PVA film incorporated with baicalin extract can be used for the development of functional protective film.

scholarly journals Strobilanthes heyneanus root extract as a potential source for antioxidant and antimicrobial activity

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Vijayakumar Sundaram ◽  
Selvaraju Sadhasivam ◽  
Sivaraj Chandrasekaran ◽  
Raaman Nanjian ◽  
Arjun Pandian
Keyword(s):  
Dermal Fibroblast ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Fibroblast Cell ◽  
Phytochemical Analysis ◽  
Root Extract ◽  
Scavenging Activity ◽  
Medicinal Uses

Abstract Background Strobilanthes heyneanus (Nilgirianthus heyneanus) belongs to the family Acanthaceae that contains many species with potential for diverse medicinal uses. It is also called ‘Karun kurinji’ and is commonly found in the South-West regions of India. The species are commonly used in rheumatic complaints, sprain of the ankle, and hernia. The objectives of the study were to evaluate the antioxidant activity, phytochemical analysis, and antibacterial activities of the root extract of S. heyneanus. Results The radical scavenging and reduction assays such as DPPH● radical and OH● radical scavenging assays, as well as phosphomolybdenum reduction and Fe3+ reducing power assays, were determined for the root extract. The highest DPPH● radical scavenging activity was 88.23 ± 1.32 at 120 μg/mL concentration, and the calculated IC50 was 38.52 μg/mL concentration. The highest OH● radical scavenging activity was 51.28 ± 1.06 at 120 μg/mL concentration, and the calculated IC50 was 51.28 μg/mL concentration. The highest ABTS●+ radical scavenging activity was 91.28 ± 1.12 at 30 μg/mL concentration, and the calculated IC50 was 33.92 μg/mL concentration. The highest phosphomolybdenum reduction was 87.43 ± 0.90 at 120 μg/mL concentration, and the calculated RC50 was 24.74 μg/mL concentration. The highest Fe3+ reduction was 89.38 ± 0.98 at 120 μg/mL concentration, and the calculated RC50 was 31.06 μg/mL concentration. The antibacterial activity of S. heyneanus showed the highest zone of inhibition of 24 mm for Salmonella typhi with 500 μg/mL concentration. The cytotoxicity limits of the root extracts were tested by MTT assay using human dermal fibroblast cell lines, reflecting > 90% cell viability at a concentration of 500 μg/mL. Conclusions The current study showed that the root extract of S. heyneanus has better antioxidant properties and potential anti-bacterial compounds. The phytochemical analysis of the root extract showed the presence of alkaloids, steroids, terpenoids, phenols, flavonoids, tannins, saponins, glycosides, and carbohydrates, which are responsible for the antibacterial root extract of S. heyneanus synergistically.

Aktywność przeciwutleniająca i przeciwbakteryjna miodu, propolisu oraz pyłku kwiatowego

2020 ◽  
Vol 21 (3) ◽  
Author(s):  
Magdalena Woźniak ◽  
Lucyna Mrówczyńska ◽  
Anna Sip ◽  
Marta Babicka ◽  
Tomasz Rogoziński ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Pathogenic Bacteria ◽  
Radical Scavenging Activity ◽  
Colorimetric Method ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Total Content ◽  
Diffusion Method ◽  
Bacterial Strains

Introduction. Honey, propolis and pollen belong to bee products that have beneficial biological properties. These products exhibit e.g. antibacterial, antifungal and antioxidant properties. Due to biological activity and natural origin, bee products are used, e.g. in the food industry, cosmetology and pharmacy. Aim. The aim of the study was to compare the antioxidant and antibacterial activity of honey, propolis and pollen from an apiary located in Wielkopolska Province. Material and methods. Honey, propolis and pollen used in this study came from the same apiary located in Wielkopolska Province. The antioxidant potential of bee products was evaluated applying DPPH· free radical scavenging activity assay. The antimicrobial activity of the tested bee products was determined by the point-diffusion method against 13 strains of pathogenic and potentially pathogenic bacteria. In addition, the total content of phenolic compounds in honey, propolis and pollen was determined by the colorimetric method. Results. Propolis exhibited higher antioxidant activity, in comparison to honey and pollen. The antiradical activity of propolis was equal to 80% approx. activity of Trolox, the standard antioxidant. Among tested bee products, propolis was characterized by the highest total phenols content. In addition, honey, propolis and pollen showed antagonistic activity against tested bacterial strains. Conclusions. The obtained results indicate that among the tested bee products of native origin, i.e. honey, propolis and pollen, propolis characterized by the highest antioxidant activity and the total content of phenolic compounds. In addition, all bee products showed bactericidal activity against the tested bacterial strains.

Sign in / Sign up

Export Citation Format

Share Document