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Related Concept Videos

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Unlike ethane and propane that have only two major conformations, butane has more than two conformers. The staggered form of butane in which the bulky methyl groups on the two carbons are placed on opposite sides, that is, at a dihedral angle of 180°, is the lowest energy, most stable form — called the anti conformer. This conformation is stabilized due to the absence of steric repulsion between the largely spaced out methyl groups. The other two staggered conformations are...
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Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
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According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
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General Properties of Solutions

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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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Double-Staining Method to Detect Pectin in Plant-Fungus Interaction
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Pectin Conformation in Solution.

K Alba1, R J Bingham1, P A Gunning2

  • 1Department of Biological Sciences , University of Huddersfield , Huddersfield HD1 3DH , U.K.

The Journal of Physical Chemistry. B
|July 3, 2018
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Summary
This summary is machine-generated.

Pectin

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Area of Science:

  • Biopolymer science
  • Materials science
  • Food science

Background:

  • Pectin's macromolecular interactions are complex and influenced by various factors.
  • Understanding pectin's behavior in solution is crucial for its applications.

Purpose of the Study:

  • To investigate how degree of methylesterification (DM), pH, temperature, and concentration affect pectin's macromolecular interactions.
  • To characterize pectin chain dimensions and solution structure.

Main Methods:

  • Small-angle X-ray scattering (SAXS)
  • Atomic force microscopy (AFM)
  • Molecular dynamics (MD) simulations

Main Results:

  • Two distinct structural levels were observed: chain clusters (100-200 nm) and individual chains (radius of gyration ~6-42 nm).
  • Pectin chain flexibility increases with higher DM and acidic pH.
  • Hydrogen bonding drives pectin cluster formation, with high-methyl pectins exhibiting less efficient packing.

Conclusions:

  • Pectin conformations vary across relevant environments, from in vitro to in silico.
  • Findings enable rational design of advanced pectin-based biomaterials.