Production of Nitrogen‐Containing Compounds via the Conversion of Natural Microalgae from Water Blooms Catalyzed by ZrO 2

ChemSusChem ◽  
2021 ◽  
Author(s):  
Li Liu ◽  
Yingdong Zhou ◽  
Lixian Guo ◽  
Guiying Li ◽  
Changwei Hu
Keyword(s):  
Nitrogen Containing Compounds ◽  
Water Blooms

New Methods for Analyzing Water Pollutants

1982 ◽  
Vol 14 (4-5) ◽  
pp. 59-71 ◽  
Author(s):  
L H Keith ◽  
R C Hall ◽  
R C Hanisch ◽  
R G Landolt ◽  
J E Henderson
Keyword(s):  
Amino Acids ◽  
Gas Chromatography ◽  
Two Dimensional ◽  
Gas Chromatograph ◽  
New Class ◽  
New Methods ◽  
System A ◽  
Drinking Waters ◽  
Computer Controlled ◽  
Nitrogen Containing Compounds

Two new methods have been developed to analyze for organic pollutants in water. The first, two-dimensional gas chromatography, using post detector peak recycling (PDPR), involves the use of a computer-controlled gas Chromatograph to selectively trap compounds of interest and rechromatograph them on a second column, recycling them through the same detector again. The second employs a new detector system, a thermally modulated electron capture detector (TMECD). Both methods were used to demonstrate their utility by applying them to the analysis of a new class of potentially ubiquitous anthropoaqueous pollutants in drinking waters- -haloacetonitriles. These newly identified compounds are produced from certain amino acids and other nitrogen-containing compounds reacting with chlorine during the disinfection stage of treatment.

Long-term changes in fish pond management as ‘an unplanned ecosystem experiment’: importance of zooplankton structure, nutrients and light for species composition of cyanobacterial blooms

1995 ◽  
Vol 32 (4) ◽  
pp. 187-196 ◽  
Author(s):  
L. Pechar
Keyword(s):  
Species Composition ◽  
Fishery Management ◽  
Grazing Pressure ◽  
Organic Fertilizers ◽  
Cyanobacterial Blooms ◽  
Fish Stock ◽  
Fish Ponds ◽  
Single Filament ◽  
The 1950S ◽  
Water Blooms

The study presents data on the species composition of cyanobacterial water blooms in Czech fish ponds from the 1950s to the 1990s. Since the 1950s, a shift from large-colonial Aphanizomenon flos-aquae var. flos-aquae through Microcystis aeruginosa and small-colonial species of Anabaena to single-filament species (Planktohrix agardhii, Limnothrix redekei, Aphanizomenon gracile) or single-cell forms (Microcystis ichtyoblabe), has been observed. The changes in the species composition of the water blooms are closely related to changes in fishery management (increase in fish stock, increase in application of organic fertilizers). At present the high predation of fish upon zooplankton results in elimination of large colonial blooms of A. flos-aquae associated with large filtering zooplankton (Daphnia). Low grazing pressure of zooplankton, low light conditions and low N:P ratios are suitable conditions for mass development of the small species of cyanobacteria. High pH is not necessary to achieve cyanobacteria dominance.

scholarly journals Characterisation of nitrogen-containing organic compounds by UHPLC-Qtof-MS and anti-amylase activity from the chloroform extract of the bark of Rhizophora mucronata

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
P. Resmi ◽  
G. Jitha ◽  
Vishnu Murali ◽  
Anu Gopinath
Keyword(s):  
Diabetes Mellitus ◽  
Amylase Activity ◽  
Chloroform Extract ◽  
Significant Activity ◽  
Rhizophora Mucronata ◽  
Inhibition Assay ◽  
Mangrove Plant ◽  
Starting Point ◽  
Treatment Of Diabetes ◽  
Nitrogen Containing Compounds

Abstract Background Medicinal importance of mangrove plant Rhizophora mucronata, a red mangrove species found in the Asian countries, has long been recognised in traditional systems of medicine. The identification of its phytoconstituents can be a starting point for the drug development. The aim of the work was to extend the current knowledge of phytoconstituents from R. mucronata and to explore its pharmacological importance in the treatment of diabetes mellitus. In the present study, we analysed the chloroform extract from the bark of the mangrove plant R. mucronata for nitrogen-containing constituents using UHPLC QTOF MS profiling, and α-amylase inhibition assay was carried out. Results Four nitrogen-containing compounds were identified from the chloroform extract of the bark of R. mucronata using UHPLC QTOF MS profiling. The compounds identified were N,N′-dicyclohexyl urea, a cryptolepine derivative (C17H15N3O), an aliphatic cyclic compound with hydroxyl and amino groups (C22H43NO), and C16H19NO2 (m/z 258.1495). The anti-amylase activity, an in vitro antidiabetic bioassay, of chloroform extract showed an IC50 value of 220.09 μg/ml. Conclusions This is the first report on the identification of nitrogen-containing compounds from the chloroform extract of the bark of the R. Mucronata. One of the compounds identified was a novel cryptolepine derivative (C16H13N3O), and it falls under the rare category indoloquinoline alkaloid. The chloroform extract also showed significant activity towards α-amylase inhibition assay. Thus, the study has gone some way towards our understanding of the efficacy of bark of the R. mucronata for the treatment of diabetes mellitus and is open for further research.

How neutral nitrogen-containing compounds are oxidized in oxidative-denitrogenation of liquid fuel with TiO2@carbon?

2021 ◽  
Author(s):  
Biswa Nath Bhadra ◽  
Yong Su Baek ◽  
Cheol Ho Choi ◽  
Sung Hwa Jhung
Keyword(s):  
Heterogeneous Catalyst ◽  
Liquid Fuel ◽  
Nitrogen Containing Compounds

Oxidative-denitrogenation (ODN) of indole (IND) and methyl-substituted INDs (methyl-INDs), the representative neutral nitrogen-containing compounds (NCCs), was carried out with TiO2@C and H2O2 as heterogeneous catalyst and oxidant, respectively, under ultrasound...

scholarly journals Nitrogen-containing aromatic compounds: quantitative analysis using gas chromatography with nitrogen phosphorus detector

2021 ◽  
Author(s):  
Yuan Rao ◽  
Arno de Klerk
Keyword(s):  
Gas Chromatography ◽  
Quantitative Analysis ◽  
Aromatic Compounds ◽  
Process Development ◽  
Complex Mixtures ◽  
Response Factors ◽  
Cyanide Anion ◽  
Nitrogen Phosphorus Detector ◽  
Assurance Process ◽  
Nitrogen Containing Compounds

AbstractThe nitrogen-containing aromatic compounds found in the petrochemical industry are varied and extend beyond classes such as the anilines, pyrroles and pyridines. Quantification of these nitrogen-containing compounds that may occur in complex mixtures has practical application for quality assurance, process development and the evaluation of conversion processes. Selective detection of nitrogen-containing species in complex mixtures is possible by making use of gas chromatography coupled with a nitrogen phosphorous detector (GC-NPD), which is also called a thermionic detector. Despite the linearity of the NPD response to individual nitrogen-containing compounds, the response factor is different for different compounds and even isomers of the same species. Quantitative analysis using an NPD requires species-specific calibration. The reason for the sensitivity of the NPD to structure is related to the ease of forming the cyano-radical that is ionized to the cyanide anion, which is detected. The operation of the NPD was related to the processes of pyrolysis and subsequent ionization. It was possible to offer plausible explanations for differences in response factors for isomers based on pyrolysis chemistry. Due to this relationship, the NPD response can in the same way be used to provide information of practical relevance beyond its analytical value and a few possible applications were outlined.

Nitrogen–containing compounds from Hemerocallis fulva var. sempervirens

2014 ◽  
Vol 49 (6) ◽  
pp. 991-995 ◽  
Author(s):  
Y. Ogawa ◽  
M. Kawai ◽  
A. Kinoshita ◽  
T. Konishi
Keyword(s):  
Nitrogen Containing Compounds

ChemInform Abstract: N-Fluorination of Some Nitrogen-Containing Compounds with Cesium Fluoroxysulfate.

ChemInform ◽  
2010 ◽  
Vol 23 (25) ◽  
pp. no-no
Author(s):  
A. A. GAKH ◽  
S. V. ROMANIKO ◽  
A. A. FAINZIL'BERG ◽  
K. G. NIKISHIN
Keyword(s):  
Nitrogen Containing Compounds
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