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Radical Autoxidation01:20

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Polydimethylsiloxane Droplets Exhibit Extraordinarily High Antioxidative Effects in Deep-Frying.

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Polydimethylsiloxane (PDMS) prevents oil oxidation during deep-frying only when present as insoluble droplets, not a surface layer. These droplets attract compounds, inhibiting oxidation and reducing volatile odors.

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Area of Science:

  • Food Science and Technology
  • Material Science
  • Chemical Engineering

Background:

  • Polydimethylsiloxane (PDMS) is widely believed to provide antioxidative effects in oils.
  • The mechanism of PDMS antioxidative action, particularly during high-temperature applications like deep-frying, requires clarification.
  • Previous assumptions attributed PDMS's benefits to a surface layer, but this study investigates alternative mechanisms.

Purpose of the Study:

  • To investigate the conditions under which polydimethylsiloxane (PDMS) exhibits antioxidative effects in oils during deep-frying.
  • To determine the role of PDMS physical state (layer vs. droplets) in its antioxidative efficacy.
  • To elucidate the mechanism behind PDMS's suppression of oil oxidation and volatile compound formation.

Main Methods:

  • Comparative analysis of PDMS antioxidative effects in canola oil under different conditions: surface layer vs. suspended droplets.
  • Evaluation of oil-soluble methylphenylsiloxane (PMPS) and PDMS in PDMS-soluble canola oil fatty acid ester.
  • Assessment of PDMS droplet zeta potential and interaction with low molecular weight compounds and volatile substances.

Main Results:

  • A PDMS surface layer on canola oil showed no antioxidative effect during simulated deep-frying.
  • PDMS exhibited significant antioxidative effects only when present as insoluble droplets within the oil.
  • PDMS droplets, due to high negative zeta potential, attracted oxygen and volatile compounds, thereby inhibiting oil oxidation and reducing odor.

Conclusions:

  • The antioxidative efficacy of PDMS in oils during deep-frying is contingent on its formation of insoluble droplets, not a surface layer.
  • PDMS droplets suppress oxidation by physically interfering with oxygen molecules and attracting detrimental compounds.
  • The addition of PDMS to oil can effectively reduce the formation of undesirable volatile compounds during heating.