scholarly journals The Effects of Hydrogen Peroxide on Plant Growth, Mineral Accumulation, as Well as Biological and Chemical Properties of Ficus deltoidea

Agronomy ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 599 ◽  
Author(s):  
Nik Nurnaeimah ◽  
Nashriyah Mat ◽  
Khamsah Suryati Mohd ◽  
Noor Afiza Badaluddin ◽  
Nornasuha Yusoff ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Antioxidant Activity ◽  
Chemical Properties ◽  
The Other ◽  
Mineral Nutrient ◽  
Flavonoid Content ◽  
Ficus Deltoidea ◽  
Other Hand ◽  
Mineral Accumulation ◽  
And Chemical Properties

Hydrogen peroxide (H2O2) is defined as a reactive oxygen species (ROS), able to cause damage to a variety of cellular structures. On the other hand, recent work has demonstrated that H2O2 can also act as a potent signaling molecule that mediates various physiological and biochemical processes in plants. This study was carried out to investigate the effects of H2O2 on the growth, mineral nutrient accumulation, as well as the biologic and chemical properties of Ficus deltoidea var. deltoidea. F. deltoidea plants were spray-treated with 0- (control), 8-, 16-, 30- and 60-mM H2O2 under field conditions. Plant height, leaf area, chlorophyll content, net photosynthetic rate, stomatal conductance and quantum yield of the F. deltoidea plants significantly increased after treatment with 16 and 30-mM H2O2. The results indicate that 60-mM H2O2 increased the accumulation of arsenic, iron and sodium content in the leaves of F. deltoidea. On the other hand, 8-mM H2O2 significantly enhanced the accumulation of arsenic, iron, calcium and potassium content in the syconium of F. deltoidea plants. In addition, H2O2 treatment did not produce any significant effects on antimony and magnesium accumulation in the leaves or the syconium of F. deltoidea plants. The results show that the F. deltoidea plant has strong antidiabetic properties and its α-glucosidase activity increased in treated plants compared to standard acarbose. Hydrogen peroxide, particularly in concentrations of 16 and 30 mM, increased the antioxidant activity, total phenolic and flavonoid content and the vitexin and isovitexin content. There was a positive correlation between antioxidant activity with total phenol and total flavonoid content in H2O2-treated plants. The quantitative analysis by HPTLC indicates that the amount of vitexin and isovitexin increased with the higher concentrations of H2O2. From this study, it can be concluded that spraying 16 and 30-mM H2O2 once a week enhances growth, mineral accumulation and stimulates bioactive compounds of the F. deltoidea plants.

scholarly journals Reaktive E=C(p – p)π-Systeme, XX [1] / Reactive E=C(p–p)π-Systems, XX [1]

1990 ◽  
Vol 45 (2) ◽  
pp. 148-160 ◽  
Author(s):  
Joseph Grobe ◽  
Marianne Hegemann ◽  
Duc Le Van
Keyword(s):  
Chemical Properties ◽  
Vapour Phase ◽  
Diels Alder ◽  
The Other ◽  
Molar Ratio ◽  
One Pot ◽  
Nmr Data ◽  
Other Hand ◽  
And Chemical Properties

The vapour phase pyrolysis of the stannylphosphane Me3SnP(CF3)C2F5 (5) at 330 °C leads to 1,2-elimination of Me3SnF yielding a mixture of the two isomeric perfluorophosphaalkenes F3CP=C(F)CF3 (3) and F5C2P=CF2 (4) in a 3:1 molar ratio. 3 is more labile than 4 and proves to be similar to the perfluoro-3-phosphapent-2-ene F5C2P=C(F)CF3 (2) with respect to NMR data and chemical properties. On the other hand 4 resembles the perfluoro-2-phosphapropene F3CP=CF2 (1). These results have been deduced from the following reactivity studies: (i) The rate of dimerization being higher for 3 than for 4. (ii) Reaction of the mixture with diethylamine yielding the aminophosphane derivative F3CP(NEt2)CF(H)CF3 (13) as a product of 3 and the C-aminophosphaalkene F5C2P=C(F)NEt2 (14) as the derivative of 4. (iii) Reaction of the mixture with methanol giving the methoxyphosphane F3CP(OMe)CF(H)CF3 (15) from 3 and the secondary phosphane F5C2P(H)CF2OMe (16) from 4 as precursors. 3 and 4 prove to be effective dienophiles in reactions with 2,3-dimethyl-1,3-butadiene and 1,3-cyclohexadiene, respectively, producing the corresponding Diels-Alder adducts 9 to 12. For these preparations 5 can be used as an equivalent of 3 in a one-pot procedure at 70 °C. On the other hand the phosphane HP(CF3)C2F5 (8) is suited as precursor for 3 in preparing HX addition products.

scholarly journals The antioxidant activities, cytotoxic properties, and identification of water-soluble compounds of Ficus deltoidea leaves

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5694 ◽  
Author(s):  
Noor Nazirahanie Abrahim ◽  
Puteri Shafinaz Abdul-Rahman ◽  
Norhaniza Aminudin
Keyword(s):  
Antioxidant Activity ◽  
Crude Extract ◽  
Antioxidant Activities ◽  
Normal Liver ◽  
Water Soluble ◽  
The Other ◽  
Flavonoid Content ◽  
Normal Liver Cell ◽  
Ficus Deltoidea ◽  
Phenolic And Flavonoid

Leaves from three varieties of Ficus deltoidea, colloquially termed small- (FDS), medium- (FDM), and big-type leaf (FDB), were subjected to water extraction. The crude extracts were fractionated using water (WF) and ethyl acetate (EAF). The phenolic and flavonoid content, antioxidant activity, and cytotoxicity of the fractions were investigated. The EAF had the highest phenolic and flavonoid content compared to the other FDS fractions. Conversely, the FDM crude extract had the highest phenolic and flavonoid content compared to the other FDM samples. Antioxidant activity was highest in the FDB crude extract. Ultra-high–performance liquid chromatography showed that two compounds, vitexin and coumaric acid, were present in the FDB crude extract. Additionally, the F. deltoidea leaves caused no signs of toxicity in a normal liver cell line. Our findings show that F. deltoidea varieties have excellent antioxidant activity with no cytotoxic effects on normal liver cells.

Decontamination Strategies for Filtering Facepiece Respirators (FFRs) in Healthcare Organizations: A Comprehensive Review

2020 ◽  
Author(s):  
Ashok Kumar Jena ◽  
Jitendra Sharan
Keyword(s):  
Hydrogen Peroxide ◽  
Ethylene Oxide ◽  
Time Use ◽  
Ultraviolet Irradiation ◽  
The Other ◽  
Limited Time ◽  
Healthcare Organizations ◽  
Comprehensive Review ◽  
Dry Heat ◽  
Other Hand

Abstract Filtering facepiece respirators (FFRs) are made for one-time use. A massive shortage of FFRs is widespread during pandemic events and has forced many healthcare organizations to decontaminate them and re-use for a limited time. Many decontamination methods have been proposed for the decontamination of FFRs. This review highlights various aspects of decontamination methods available in the literature. Among various methods available, vaporized hydrogen peroxide, ultraviolet irradiation, and dry heat seem to be the most promising decontaminants for FFRs. On the other hand, microwave, bleach, ethylene oxide, alcohol, hydrogen peroxide liquid, sanitizing wipes, and soap and water are not recommended methods for FFR decontamination.

scholarly journals Pomological traits, phenol and flavonoid content and antioxidant activity introduced the pomegranate (Punica granatum L.) cultivars grown in the Mediterranean part of Croatia

2018 ◽  
Vol 21 (3-4) ◽  
pp. 171-180
Author(s):  
Mira Radunić ◽  
Ela Šimera ◽  
Katarina Lozo ◽  
Jelena Gadže ◽  
Maja Jukić Špika
Keyword(s):  
Antioxidant Activity ◽  
Chemical Properties ◽  
Punica Granatum ◽  
Fruit Weight ◽  
Flavonoid Content ◽  
Juice Yield ◽  
Fruit Samples ◽  
Soluble Solid ◽  
Punica Granatum L

Fruit samples of ‘Granada’, ‘Wonderful’ and ‘Hicaznar’ cultivars were collected in productive pomegranate orchard in Neretva valley, Metković (Croatia) and their pomological and chemical properties were compared. Significant differences among cultivars were noted between the studied traits. Fruit weight ranged from 429.37 g to 359.43 g and the lowest was recorded in cv. ‘Hicaznar’. Color of peel, aril and juice of all investigated cultivars was intensively red and dark red, respectively. ‘Granada’ and ‘Wonderful’ stood out with high juice yield compared with ‘Hicaznar’. Total soluble solid (TSS) of ‘Hicaznar’ (18.61%) was higher than that of ‘Wonderful’ (16.64%). Total acidity (TA) significantly differed among cultivars and ranged from 1.6% to 2.1%. According to the TSS/TA ratio investigated cultivars belong to the group of sour-sweet cultivars. Dissimilarity between cultivars was found in the phenolics content (TPC). It ranged from 679.6 to 906.6 mg/100 g D.W. where ‘Hicaznar’ stood out as a cultivar with highest TPC and also highest flavonoid and non-flavonoid content (521.1 mg/100 g D.W. and 385.5 mg/100 g D.W., respectively). In ‘Granada’ antioxidant activity measured by 1,1-diphenyl-2-picrylhydrazyl was recorded for 64.1%, in ‘Wonderful’ 70.2% and the highest in ‘Hicaznar’ (74.5%). Results of this assessment are the basis for practical determination of the pomegranate use.

scholarly journals STUDIES ON OXIDATION AND REDUCTION BY PNEUMOCOCCUS

1924 ◽  
Vol 39 (5) ◽  
pp. 745-755 ◽  
Author(s):  
Oswald T. Avery ◽  
James M. Neill
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Oxygen ◽  
Hemolytic Activity ◽  
Active Agent ◽  
Organic Peroxide ◽  
Cell Extract ◽  
The Other ◽  
Cell Extracts ◽  
Other Hand ◽  
The Stability

In the present work on oxidation and reduction by sterile extracts of pneumococcus, the preparations employed contain among other constituents, a hemolytic substance the properties of which have been described by Cole (1, 2) in his studies on pneumococcus hemotoxin. Pneumococcus extracts prepared by the methods described are actively hemolytic, 0.005 cc. of extract causing complete lysis of 2.5 cc. of a 1 per cent suspension of red cells from rabbit blood. This hemolytic property of pneumococcus extracts is destroyed by 10 minutes exposure to 55°C. When pneumotoxin-containing extracts are protected from the action of molecular oxygen, their hemolytic activity remains unimpaired for considerable periods of time. In the presence of air, on the other hand, the stability of the hemolytic substance depends upon whether the particular type of extract contains a "complete" or "incomplete" oxidation-reduction system. Sterile broth extracts of unwashed pneumococci are reactive with molecular oxygen, and as a result of this union peroxide is formed whenever these extracts are exposed to air. The hemolytic activity of "complete" extracts of this type is rapidly decreased and finally destroyed in the presence of molecular oxygen. On the other hand, the "incomplete" type of extract prepared by saline extraction of washed pneumococci may be exposed to air with little or no loss of hemolytic power. This "incomplete" washed cell extract, unless reactivated, does not undergo autoxidation in the presence of air; under these circumstances peroxide is not formed and the hemolytic activity of this type of extract is not impaired by exposure to air. The stability of the hemolytic agent in the "incomplete" type of extract is evidence that this substance is itself not reactive with or affected by molecular oxygen, even in the presence of the cell enzymes. The destruction of the same hemolytic substance in extracts capable of undergoing autoxidation may be ascribed to the action of some peroxide formed by the union of molecular oxygen with easily oxidized or autoxidizable substances of the extract. It is now known that a peroxide, having the reactions of hydrogen peroxide, accumulates in sterile pneumococcus extracts during oxidation. It has been shown in the present study that the addition of preformed hydrogen peroxide destroys the hemolytic activity of pneumococcus extracts, although higher concentrations were required than were detected in oxidized extracts themselves. These facts and the known action of superoxides in analogous types of reaction make it seem not unlikely that the active agent in the destruction of pneumotoxin in oxidized cell extracts may be a peroxide; either hydrogen peroxide or some higher organic peroxide formed during autoxidation of the extract.

Improvement in the SiO2/4H-SiC Interfacial Region by Thermal Treatments with Hydrogen Peroxide

2012 ◽  
Vol 717-720 ◽  
pp. 753-756
Author(s):  
Eduardo Pitthan ◽  
Silma A. Corrêa ◽  
Rodrigo Palmieri ◽  
Gabriel Vieira Soares ◽  
Henri I. Boudinov ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
The Other ◽  
Significant Alteration ◽  
Interfacial Region ◽  
Thermal Treatments ◽  
Other Hand

The effect of sequential thermal treatments with growth/removal steps of SiO2 films intercalated with hydrogen peroxide treatments on the SiO2/4H-SiC interfacial region thickness were investigated on both Si and C faces. In the Si face case, samples that were submitted to more H2O2 treatments presented thinner interfacial region thicknesses. In the C face case, on the other hand, no significant alteration in this region was observed.

scholarly journals On a new compound of chlorine and carbon

1833 ◽  
Vol 2 ◽  
pp. 153-153
Keyword(s):  
Carbonic Acid ◽  
Chemical Properties ◽  
Glass Tube ◽  
The Other ◽  
Physical And Chemical Properties ◽  
Rock Crystal ◽  
Acid Gas ◽  
Green Glass ◽  
Physical And Chemical ◽  
And Chemical Properties

The above substance was discovered by M. Julien, of Abo, in Finland, amongst the products arising out of the distillation of calcined sulphate of iron, with crude nitre in iron retorts. It forms white acicular crystals by sublimation, and when passed through a green glass tube containing red-hot rock crystal, it is decomposed with the deposition of charcoal and evolution of chlorine. It is not altered by repeated sublimations in chlorine. It was analysed by passing its vapour over red-hot oxide of copper, by which chloride of copper and carbonic acid gas were produced: the former was de­composed by nitrate of silver, and the proportion of chlorine esti­mated by that of chloride of silver formed. From this and other experiments, the authors conclude that this substance consists of one portion of chlorine and two of carbon: they failed in their endea­vours to convert it into either of the other chlorides of carbon, to which, in its physical and chemical properties, it bears however a considerable resemblance.

Sign in / Sign up

Export Citation Format

Share Document