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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Body Temperature01:07

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Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
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Temperature-responsive extraction of violacein using a tuneable anionic surfactant-based system.

Nicolas Schaeffer1, Mariam Kholany1, Telma L M Veloso1

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A novel thermoresponsive system using sodium dodecyl sulfate and tetrabutylammonium chloride enables efficient extraction and purification of violacein from yeast. This integrated process separates violacein from proteins using cloud-point separation.

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Area of Science:

  • Biotechnology
  • Chemical Engineering
  • Biochemistry

Background:

  • Violacein is a valuable pigment with potential pharmaceutical applications.
  • Current extraction and purification methods for violacein can be inefficient and costly.
  • Biotechnological production using engineered yeast offers a sustainable source of violacein.

Purpose of the Study:

  • To develop a tuneable thermoresponsive system for efficient violacein extraction.
  • To integrate violacein purification into the extraction process.
  • To separate violacein from contaminant proteins using cloud-point separation.

Main Methods:

  • Utilized a tuneable thermoresponsive system comprising sodium dodecyl sulfate and tetrabutylammonium chloride.
  • Applied the system for solid-liquid extraction of violacein from bio-engineered Yarrowia lipolytica.
  • Employed cloud-point separation to purify violacein from proteins.

Main Results:

  • Successfully demonstrated a tuneable thermoresponsive system for violacein extraction.
  • Achieved efficient separation of violacein from contaminant proteins.
  • Integrated extraction and purification into a single, streamlined process.

Conclusions:

  • The developed thermoresponsive system offers an efficient and integrated approach for violacein production.
  • Cloud-point separation provides an effective method for violacein purification, reducing downstream processing complexity.
  • This study presents a promising biotechnological strategy for violacein recovery.