scholarly journals Extraction of Natural Cellulose and Zein Protein from Corn Silk: Physico-Chemical and Biological Characterization

2020 ◽  
Vol 11 (3) ◽  
pp. 10614-10619
Keyword(s):  
Antioxidant Activity ◽  
Biological Activity ◽  
Crystalline Cellulose ◽  
Biological Characterization ◽  
Structural Variations ◽  
Corn Silk ◽  
Physico Chemical ◽  
Natural Cellulose ◽  
Zein Protein

The aim of the present study is to extract natural cellulose and zein protein from Egyptian corn silk using two different protocols being; filtration (NaOH/H2SO4) and Solubility (NaOH/Urea). The extracted cellulose and zein via the two protocols are characterized using XRD, FTIR, and FESEM with EDAX. The biological activity of the extracted zein was assessed. Results proved the successful extraction of cellulose and zein via the two applied protocols. However, significant structural variations had recorded for the extracted cellulose and silk. The solubility protocol produced more crystalline cellulose when compared with the filtration one. The extracted zein via both protocols presents promising antioxidant activity.

scholarly journals Talisia esculenta (A. ST.-HIL.) Radlk: physico-chemical characteristics, antioxidant activity and biological activity

2020 ◽  
Vol 9 (2) ◽  
pp. e53921909
Author(s):  
Layanne Nascimento Fraga ◽  
Izabela Maria Montezano de Carvalho
Keyword(s):  
Antioxidant Activity ◽  
Biological Activity ◽  
Chemical Composition ◽  
Chemical Characterization ◽  
Chemical Characteristics ◽  
Review Of The Literature ◽  
Study Objective ◽  
Wild Fruit ◽  
Physico Chemical ◽  
Bioactive Potential

Talisia esculenta (A. ST.-HIL.) Radlk is a Brazilian wild fruit, known as a pitomba, belonging to the Sapindaceae family. The objective of the present work was to perform a review of the literature in order to identify studies on its physico-chemical characterization, antioxidant activity and biological activity. The articles search was done in PubMed, SciELO, Science Direct and LILACS. We identified 90 publications, 8 in SciELO, 3 in LILACS, 67 in Science Direct and 12 in PubMed. Subsequently, duplication of the articles between the databases was verified, and the triage was done by reading the titles, abstracts and reading in full, to analyze which articles fit the study objective, and only 5 studies were included. The review exposes Talisia esculenta Radlk (A. ST.-HIL.) as a fruit that has a bioactive potential, but there is a shortage of studies that deal with its chemical composition and its biological activity.

scholarly journals Effect of Particle Size on Physico-Chemical Properties and Antioxidant Activity of Corn Silk Powder

2012 ◽  
Vol 57 (1) ◽  
pp. 41-50 ◽  
Author(s):  
Sun-Mi Cha ◽  
Beom-Young Son ◽  
Jin-Seok Lee ◽  
Seong-Bum Baek ◽  
Sun-Lim Kim ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Particle Size ◽  
Chemical Properties ◽  
Corn Silk ◽  
Physico Chemical ◽  
Effect Of Particle Size

Biological Function and Chemistry of Endothelin. A Review

1999 ◽  
Vol 64 (8) ◽  
pp. 1211-1252 ◽  
Author(s):  
Jan Hlaváček ◽  
Renáta Marcová
Keyword(s):  
Biological Activity ◽  
Amino Acid ◽  
Biological Function ◽  
Biological Properties ◽  
Structural Basis ◽  
Amino Acid Residues ◽  
Snake Venoms ◽  
Vasoactive Peptides ◽  
Physico Chemical ◽  
Endothelin A

The first part of this review deals with the biosynthesis and a biological function of strongly vasoactive peptides named endothelins (ETs) including vasoactive intestinal contractor. Where it was useful, snake venoms sarafotoxins which are structural endothelin derivatives, were also mentioned. In the second part, an attention is paid to structural basis of the ETs biological activity, with respect to alterations of amino acid residues in the parent peptides modifying the conformation and consequently the physico-chemical and biological properties in corresponding ETs analogs. Special attention is focussed on the area of ETs receptors and their interaction with peptide and non peptide agonists and antagonists, important in designing selective inhibitors of ETs receptors potentially applicable as drugs in a medicine. A review with 182 references.

scholarly journals Silver Nanoparticles Stabilized with Phosphorus-Containing Heterocyclic Surfactants: Synthesis, Physico-Chemical Properties, and Biological Activity Determination

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1883
Author(s):  
Martin Pisárčik ◽  
Miloš Lukáč ◽  
Josef Jampílek ◽  
František Bilka ◽  
Andrea Bilková ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Biological Activity ◽  
Zeta Potential ◽  
Chain Length ◽  
Alkyl Chain ◽  
Chemical Properties ◽  
Alkyl Chain Length ◽  
Microbial Pathogens ◽  
Physico Chemical ◽  
Phosphorus Containing

Phosphorus-containing heterocyclic cationic surfactants alkyldimethylphenylphospholium bromides with the alkyl chain length 14 to 18 carbon atoms were used for the stabilization of silver nanodispersions. Zeta potential of silver nanodispersions ranges from +35 to +70 mV, which indicates the formation of stable silver nanoparticles (AgNPs). Long-chain heptadecyl and octadecyl homologs of the surfactants series provided the most intensive stabilizing effect to AgNPs, resulting in high positive zeta potential values and smaller diameter of AgNPs in the range 50–60 nm. A comparison with non-heterocyclic alkyltrimethylphosphonium surfactants of the same alkyl chain length showed better stability and more positive zeta potential values for silver nanodispersions stabilized with heterocyclic phospholium surfactants. Investigations of biological activity of phospholium-capped AgNPs are represented by the studies of antimicrobial activity and cytotoxicity. While cytotoxicity results revealed an increased level of HepG2 cell growth inhibition as compared with the cytotoxicity level of silver-free surfactant solutions, no enhanced antimicrobial action of phospholium-capped AgNPs against microbial pathogens was observed. The comparison of cytotoxicity of AgNPs stabilized with various non-heterocyclic ammonium and phosphonium surfactants shows that AgNPs capped with heterocyclic alkyldimethylphenylphospholium and non-heterocyclic triphenyl-substituted phosphonium surfactants have the highest cytotoxicity among silver nanodispersions stabilized by the series of ammonium and phosphonium surfactants.

Astaxanthin–garlic oil nanoemulsions preparation using spontaneous microemulsification technique: optimization and their physico–chemical properties

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Seyedalireza Mortazavi Tabrizi ◽  
Afshin Javadi ◽  
Navideh Anarjan ◽  
Seyyed Javid Mortazavi Tabrizi ◽  
Hamid Mirzaei
Keyword(s):  
Antioxidant Activity ◽  
Particle Size ◽  
Subcritical Water ◽  
Chemical Properties ◽  
Polydispersity Index ◽  
Garlic Oil ◽  
Physico Chemical ◽  
Minimum Particle Size ◽  
Oil In Water ◽  
Technique Optimization

AbstractGarlic oil in water nanoemulsion was resulted through subcritical water method (temperature of 120 °C and pressure of 1.5 bar, for 2 h), using aponin, as emulsifier. Based on the prepared garlic oil nanoemulsion, astaxanthin–garlic oil nanoemulsions were prepared using spontaneous microemulsification technique. Response surface methodology was employed to evaluate the effects of independent variables namely, amount of garlic oil nanoemulsion (1–9 mL) and amount of provided astaxanthin powder (1–9 g) on particle size and polydispersity index (PDI) of the resulted nanoemulsions. Results of optimization indicated that well dispersed and spherical nanodroplets were formed in the nanoemulsions with minimum particle size (76 nm) and polydispersity index (PDI, 0.358) and maximum zeta potential value (−8.01 mV), using garlic oil nanoemulsion amount of 8.27 mL and 4.15 g of astaxanthin powder. Strong antioxidant activity (>100%) of the prepared astaxanthin–garlic oil nanoemulsion, using obtained optimum amounts of the components, could be related to the highest antioxidant activity of the colloidal astaxanthin (>100%) as compared to that of the garlic oil nanoemulsion (16.4%). However, higher bactericidal activity of the resulted nanoemulsion against Escherichia coli and Staphylococcus aureus, were related to the main sulfur bioactive components of the garlic oil in which their main functional groups were detected by Fourier transform-infrared spectroscopy.

scholarly journals Impact of Harvest Conditions and Host Tree Species on Chemical Composition and Antioxidant Activity of Extracts from Viscum album L.

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3741
Author(s):  
Wioleta Pietrzak ◽  
Renata Nowak
Keyword(s):  
Antioxidant Activity ◽  
Biological Activity ◽  
Chemical Composition ◽  
Tree Species ◽  
Plant Material ◽  
Plant Secondary Metabolites ◽  
Host Tree ◽  
Host Tree Species ◽  
High Antioxidant Activity ◽  
Mistletoe Extracts

The content of plant secondary metabolites is not stable, and factors such as the region/location effect and seasonal variations have an impact on their chemical composition, especially in parasitic plants. Research in this area is an important step in the development of quality parameter standards of medicinal plants and their finished products. The effects of the time and place of harvest and the host tree species on the chemical composition and antioxidant activity of mistletoe extracts were investigated. Statistical tools were used to evaluate the results of the spectrophotometric and LC-ESI-MS/MS studies of the phenolic composition and antioxidant activity. The investigations indicate that the qualitative and quantitative composition, influencing the biological activity of mistletoe extracts, largely depends on the origin of the plant. The mistletoe extracts exhibited a rich phenol profile and high antioxidant activity. The chemometric analysis indicated that mistletoe collected from conifers (Viscum abietis and Viscum austriacum) had the most advantageous chemical composition and antioxidant activity. Moreover, the chemical profile and biological activity of the plant material were closely related to the climatic conditions and location of the harvested plant. Higher levels of phenolic compounds and high antioxidant activity were found in extracts obtained from plant material collected in cold weather with the presence of snow and less sunshine (autumn–winter period).

Aktywność biologiczna ekstraktów z propolisu

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Magdalena Woźniak ◽  
Anna Kwiatkowska ◽  
Elżbieta Hołderna-Kędzia ◽  
Katarzyna Sosnowska ◽  
Lucyna Mrówczyńska ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Biological Activity ◽  
Phenolic Compounds ◽  
Propylene Glycol ◽  
Ethyl Alcohol ◽  
Antiradical Activity ◽  
Colorimetric Method ◽  
Biological Properties ◽  
Bioactive Substances ◽  
Dpph Test

Introduction. Propolis, also known as bee glue, is a resinous material collected by honeybees with numerous biological properties, including antibacterial, antifungal, antioxidant and anticancer effects. Due to its health-promoting properties, propolis is a component of many products, including dietary supplements, cosmetics and healthy food. Aim. The aim of the study was to determine the antibacterial, antifungal and antioxidant activity of propolis extracts, as well as to compare the biological activity of propolis extracts, depending on the solvent used – ethyl alcohol or propylene glycol. Material and methods. Two propolis extracts were used in the research – the first was prepared in ethyl alcohol, and the second in propylene glycol. The antimicrobial activity of the examined extracts was determined against S. aureus, E. coli and C. albicans. The antioxidant activity was determined on the basis of the evaluation of their antiradical activity in the DPPH· test and Fe2+ chelating activity. Moreover, the total content of phenolic compounds and flavonoids in the tested extracts was determined using the colorimetric method. Results. The tested propolis extracts, regardless of the solvent used (ethyl alcohol or propylene glycol), showed high antibacterial (against S. aureus), antifungal (against C. albicans) and antioxidant (antiradical activity in the DPPH· test and ferrous iron chelating potency in the ferrozine test) activity. Moreover, both tested extracts were characterized by a high and similar content of bioactive compounds – phenolic compounds and flavonoids. Conclusions. The results of the conducted tests showed that the solvent used did not affect determined biological activity and the content of bioactive substances in the tested propolis extracts.

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