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Crown Ethers02:36

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules take.
Archaeal Cell Wall01:29

Archaeal Cell Wall

Archaeal cell walls are structurally and compositionally distinct from their bacterial counterparts, lacking the characteristic peptidoglycan layer found in most bacteria. Instead, archaeal cell walls exhibit remarkable diversity, utilizing materials such as pseudomurein, polysaccharides, and proteins to construct their protective outer layers. This structural flexibility is closely tied to archaea's ecological adaptability.S-Layers: The Common Archaeal Cell WallThe S-layer is the most...
Structure and Nomenclature of Epoxides02:38

Structure and Nomenclature of Epoxides

Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain is more in the ring having a smaller number of...
Structure and Nomenclature of Ethers02:28

Structure and Nomenclature of Ethers

Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
Classification of Ethers
Based on their attached substituent groups, ethers can be classified into two...
Bacterial Phylum Planctomycetes01:26

Bacterial Phylum Planctomycetes

Planctomycetes are a group of morphologically distinct bacteria predominantly classified into two orders: Planctomycetales and Brocadiales. These gram-negative bacteria exhibit unique features, including division by budding and the presence of stalks or appendages. Their cells are often found in rosette arrangements, and they are notable for possessing an S-layer in their cell envelope, which is relatively uncommon among bacteria. Additionally, Planctomycetes frequently exhibit intracellular...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...

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Scanning Electron Microscopy (SEM) Protocols for Problematic Plant, Oomycete, and Fungal Samples
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Scanning Electron Microscopy (SEM) Protocols for Problematic Plant, Oomycete, and Fungal Samples

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Urceolatin, a structurally unique bromophenol from Polysiphonia urceolata.

Ke Li1, Xiao-Ming Li, Nai-Yun Ji

  • 1Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, PR China.

Organic Letters
|March 8, 2008
PubMed
Summary

A novel bromophenol, urceolatin, was isolated from marine algae. This compound exhibits potent antioxidant activity, significantly outperforming butylated hydroxytoluene in DPPH radical scavenging.

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Bromodeoxyuridine (BrdU) Labeling and Subsequent Fluorescence Activated Cell Sorting for Culture-independent Identification of Dissolved Organic Carbon-degrading Bacterioplankton

Published on: September 10, 2011

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Bromodeoxyuridine (BrdU) Labeling and Subsequent Fluorescence Activated Cell Sorting for Culture-independent Identification of Dissolved Organic Carbon-degrading Bacterioplankton
12:46

Bromodeoxyuridine (BrdU) Labeling and Subsequent Fluorescence Activated Cell Sorting for Culture-independent Identification of Dissolved Organic Carbon-degrading Bacterioplankton

Published on: September 10, 2011

Area of Science:

  • Marine Natural Products Chemistry
  • Phytochemistry
  • Antioxidant Research

Background:

  • Marine red algae, such as Polysiphonia urceolata, are a rich source of unique bioactive compounds.
  • Bromophenols are a class of natural products known for their diverse biological activities, including antioxidant properties.
  • The discovery of novel chemical structures from marine organisms can lead to new therapeutic agents.

Purpose of the Study:

  • To isolate and characterize a new bromophenol from the marine red alga Polysiphonia urceolata.
  • To elucidate the chemical structure of the isolated compound using advanced spectroscopic techniques.
  • To evaluate the antioxidant potential of the novel compound through DPPH radical scavenging assays.

Main Methods:

  • Isolation of the target compound from Polysiphonia urceolata using chromatographic techniques.
  • Structure elucidation employing extensive spectroscopic analyses, including NMR and Mass Spectrometry.
  • In vitro antioxidant activity assessment using the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging assay.

Main Results:

  • A novel, highly oxygenated bromophenol, designated urceolatin (1), was successfully isolated.
  • Urceolatin possesses an unprecedented benzylphenanthro[4,5-bcd]furan core structure.
  • Compound 1 demonstrated significant DPPH radical scavenging activity, with an IC50 of 7.9 microM, 10-fold more potent than butylated hydroxytoluene.

Conclusions:

  • The marine red alga Polysiphonia urceolata yielded a structurally unique bromophenol, urceolatin.
  • Urceolatin exhibits potent antioxidant properties, suggesting its potential as a therapeutic agent.
  • This discovery highlights the potential of marine algae as a source of novel bioactive compounds.