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Topic Review
Quality Assessment of Medicinal Plants
Since ancient times, herbal medicines (HM) have played a vital role in worldwide healthcare systems. It is therefore critical that a thorough evaluation of the quality and control of its complicated chemical makeup be conducted, in order to ensure its efficacy and safety.
  • 378
  • 28 Jun 2022
Topic Review
QNMR for Reference Material Preparation
Quantitative nuclear magnetic resonance (qNMR) has been used as a purity determination method for reference material development, and many related measurement techniques have been designed to acquire accurate and reliable results.
  • 1.0K
  • 18 Feb 2021
Topic Review
PZT
The ligand, 4'-(4-(2,2,2-tris(1H-pyrazol-1-yl)ethoxymethyl)phenyl)-2,2':6',2"-terpyridine (PZT) contains a terpyridine fragment and a tris(pyrazolyl) fragment, which may allow synthetic differentiation between the tridentate binding sites as a result of the meridional and the facial coordination preferences of these groups around the octahedral metal centres. This designed bridging ligand may offer the benefits of polydentate ligands and minimisation of isomeric possibilities. The tris(pyrazolyl)methane fragment is of interest, because the coordination chemistry of such systems has also been studied. It, too, is easy to prepare, by reaction of pyrazole with chloroform, and to derivatise, for example by reaction with formaldehyde, to give a molecule, 2,2,2-tris(1H-pyrazol-1-yl)ethanol, that can be readily joined to the other binding site, a terpyridine containing synthon.
  • 707
  • 10 Feb 2021
Topic Review
Pyrrolotriazinone
Pyrrolotriazinones, a class of azolotriazinone, are indeed a fused bicyclic compound. Pyrrolotriazinones share common properties with all nitrogen-containing heterocycles.
  • 443
  • 17 Dec 2021
Topic Review
Pyrroloiminoquinones
Pyrroloiminoquinones are a group of cytotoxic alkaloids most commonly isolated from marine sponges. Structurally, they are based on a tricyclic pyrrolo[4,3,2-de]quinoline core and encompass marine natural products such as makaluvamines, tsitsikammamines and discorhabdins.
  • 603
  • 22 Dec 2022
Topic Review
Pyrrolizidine Alkaloids
Pyrrolizidine alkaloids (PAs) are a group of natural compounds that are present in several plant families, among which the most predominant are Boraginaceae, Asteraceae, and Fabaceae, and are produced as a defense response against herbivores. PAs are known for their toxicity and for posing an elevated risk to human and animal health when consumed in large quantities over long periods of time.
  • 728
  • 08 Feb 2024
Topic Review
Pyrolytic Conversion of Plastic Waste
Plastic production has been rapidly growing across the world and, at the end of their use, many of the plastic products become waste disposed of in landfills or dispersed, causing serious environmental and health issues. From a sustainability point of view, the conversion of plastic waste to fuels or, better yet, to individual monomers, leads to a much greener waste management compared to landfill disposal. 
  • 851
  • 25 Jun 2021
Topic Review
Pyrolysis of Polystyrene Waste
The manufacturing of polystyrene around the globe has escalated in the past years due to its huge applications in various areas. The perpetual market needs of polystyrene led the polystyrene wastes accretion in the landfill causing environmental deterioration. The soaring need for polystyrene also led to the exhaustion of petroleum, a non-renewable energy source, as polystyrene is a petroleum-derived product.
  • 2.0K
  • 28 Sep 2021
Topic Review
Pyrolysis
Pyrolysis: Thermochemical decomposition of organic materials in the absence of oxygen. Polymer-derived carbon: Carbon obtained by heat-treatment (pyrolysis followed by carbon-carbon bond formation and rearrangement) of natural or synthetic polymers. In addition to the supplied heat, surrounding gaseous environment, presence of magnetic field and applied pressure influence pyrolysis.
  • 3.5K
  • 01 Nov 2020
Topic Review
Pyridone Disperse Dyes Provide Added-Value
This entry provides a description of some of the disperse dyes based on pyridone and the uses of these disperse dyes as antioxidants and anticancer, as well as the use of polyester fabrics dyed with these dyes in various activities, especially medical activities. It is blamed that the textile industry is one of the major generators of industrial waste due to large quantities of water that contains a variety of pollutants, including dyes. So, our aim in this review is to explain that the dyeing process using high temperature and high pressure method was an environmentally friendly process. Therefore, this review provides a good data for chemists, biologists and interested people working in textile chemistry, public health and environment research areas.
  • 1.5K
  • 14 Sep 2020
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