Translation of Chemical Properties of Polyphenols into Biological Activity with Impact on Human Health

Author(s):  
João Laranjinha
2009 ◽  
Vol 5 (4) ◽  
pp. 225-237 ◽  
Author(s):  
Djebbar Atmani ◽  
Nassima Chaher ◽  
Dina Atmani ◽  
Meriem Berboucha ◽  
Nadjet Debbache ◽  
...  

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1883
Author(s):  
Martin Pisárčik ◽  
Miloš Lukáč ◽  
Josef Jampílek ◽  
František Bilka ◽  
Andrea Bilková ◽  
...  

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.


Horticulturae ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 35
Author(s):  
Bety W. Hapsari ◽  
Manikharda ◽  
Widiastuti Setyaningsih

Roselle (Hibiscus sabdariffa L.), as an edible flower, has long provided an array of positive effects on human health. This benefit is a result of phenolic compounds that are naturally present mainly in the calyx. Plentiful medicinal remedies and functional foods based on this flower are available worldwide, as supported by the studies of phenolic compounds in recent decades. This paper aims to provide a comprehensive review of the composition, biological activity, and beneficial effects on human health of phenolic compounds in roselle. This review was performed in accordance with the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines. A structured search in the published literature for phenolics compositions in roselle was required prior to the evaluation on the validity of the reported analytical methods. Reliable identification and quantification of phenolic compounds in roselle can be achieved by employing the proper extraction and separation methods. With ample alternative analytical methods discussed here, this review provided an aid for comprehending and selecting the most appropriate method for a particular study. The applications of the analytical methods highlighted indicated that phenolic acids, flavonoids, and their derivatives have been identified and quantified in roselle with a range of biological activities and beneficial effects on human health. It was also disclosed that the composition and concentration of phenolic compounds in roselle vary due to the growth factors, cultivars, and environmental influence. Finally, apart from the research progress carried out with roselle during the last ten years, this review also proposed relevant future works.


1990 ◽  
Vol 43 (3) ◽  
pp. 267-280 ◽  
Author(s):  
NOBUAKI NARUSE ◽  
OSAMU TENMYO ◽  
SEIKICHI KOBARU ◽  
HIDEO KAMEI ◽  
TAKEO MIYAKI ◽  
...  

2021 ◽  
Vol 25 ◽  
Author(s):  
Omkar Kamble ◽  
Ramababu Dandela ◽  
Sandip Shinde

: The fluorinated compounds have significance in medicinal chemistry and pharmaceuticals research. The introduction of fluorine atom in the heterocyclic compounds increases biological activity, develops favourable physiochemical interaction. Combination of the heterocycles and fluorine substituent having large scope in the research work of the different drugs molecules. The compounds not only show biological activity but also show unique physical and chemical properties that open the doors of multidisciplinary research areas. Fluorine atom tolerance towards maximum functional groups, simplicity in operation, replacing hydrogen with fluorine of bioactive molecules are more efficient for the production at the commercial level. The fluorine substitution also increases the binding affinity to the targeted protein. Also, incorporation of fluorine into the drug helps to increase the polarity hence to increase the rate of drug metabolism and improves the metabolic stability. The pharmacokinetic study plays an important role in clinical research, since 1996, researcher Whitford discover that the pharmacokinetic of fluorine is depend on its pH and amount in the bone. pH of organofluoride governs the absorption, distribution and excretion of fluoride. It also increases the stability when binding with carbon atom and resulting in an increase in bioactivity. This is the main reason that around 25% of present active drugs on various diseases, including cancer, diabetes, HIV, etc. have fluorine as important content. Not only pharmacokinetic property but also the physical property of the drug can be enhanced or altered by selective insertion at the key place of the fluorine atom in the drug compound. In this report, we have summarized the interesting research article reported since 2000 for the synthesis of low fluorine substituted organic compounds for medicinal research and pharmacokinetic study of fluorine molecules in neurological diseases, cancer, and tuberculosis research.


2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Orlando Campolo ◽  
Asma Cherif ◽  
Michele Ricupero ◽  
Gaetano Siscaro ◽  
Kaouthar Grissa-Lebdi ◽  
...  

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7451
Author(s):  
Barbara Breza-Boruta ◽  
Karol Kotwica ◽  
Justyna Bauza-Kaszewska

Properly selected tillage methods and management of the available organic matter resources are considered important measures to enable farming in accordance with the principles of sustainable agriculture. Depending on the depth and intensity of cultivation, tillage practices affect soil chemical composition, structure and biological activity. The three-year experiment was performed on the soil under spring wheat (cv. Tybalt) short-time cultivation. The influence of different tillage systems and stubble management on the soil’s chemical and biological parameters was analyzed. Organic carbon content (OC); content of biologically available phosphorus (Pa), potassium (Ka), and magnesium (Mg); content of total nitrogen (TN), mineral nitrogen forms: N-NO3 and N-NH4 were determined in various soil samples. Moreover, the total number of microorganisms (TNM), bacteria (B), actinobacteria (A), fungi (F); soil respiratory activity (SR); and pH in 1 M KCl (pH) were also investigated. The results show that organic matter amendment is of greater influence on soil characteristics than the tillage system applied. Manure application, as well as leaving the straw in the field, resulted in higher amounts of organic carbon and biologically available potassium. A significant increase in the number of soil microorganisms was also observed in soil samples from the experimental plots including this procedure.


2021 ◽  
Vol 18 (19) ◽  
pp. 5447-5463
Author(s):  
Frerk Pöppelmeier ◽  
David J. Janssen ◽  
Samuel L. Jaccard ◽  
Thomas F. Stocker

Abstract. Chromium (Cr) and its isotopes hold great promise as a tracer of past oxygenation and marine biological activity due to the contrasted chemical properties of its two main oxidation states, Cr(III) and Cr(VI), and the associated isotope fractionation during redox transformations. However, to date the marine Cr cycle remains poorly constrained due to insufficient knowledge about sources and sinks and the influence of biological activity on redox reactions. We therefore implemented the two oxidation states of Cr in the Bern3D Earth system model of intermediate complexity in order to gain an improved understanding on the mechanisms that modulate the spatial distribution of Cr in the ocean. Due to the computational efficiency of the Bern3D model we are able to explore and constrain the range of a wide array of parameters. Our model simulates vertical, meridional, and inter-basin Cr concentration gradients in good agreement with observations. We find a mean ocean residence time of Cr between 5 and 8 kyr and a benthic flux, emanating from sediment surfaces, of 0.1–0.2 nmol cm−2 yr−1, both in the range of previous estimates. We further explore the origin of regional model–data mismatches through a number of sensitivity experiments. These indicate that the benthic Cr flux may be substantially lower in the Arctic than elsewhere. In addition, we find that a refined representation of oxygen minimum zones and their potential to reduce Cr yield Cr(III) concentrations and Cr removal rates in these regions in much improved agreement with observational data. Yet, further research is required to better understand the processes that govern these critical regions for Cr cycling.


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