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Related Concept Videos

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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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Peroxisomes and Mitochondria01:30

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Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
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Oxidations of Aldehydes and Ketones to Carboxylic Acids01:15

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Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

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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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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
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Autoxidation of Ethers to Peroxides and Hydroperoxides02:23

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Ethers represent a class of chemical compounds that become more dangerous with prolonged storage because they tend to form explosive peroxides when standing in the air. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly oxidize to form hydroperoxides and dialkyl peroxides.
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Measuring Lactase Enzymatic Activity in the Teaching Lab
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Lactoperoxidase: Properties, Functions, and Potential Applications.

Hasan Kutluay Özhan1, Hatice Duman1, Mikhael Bechelany2,3

  • 1Department of Molecular Biology and Genetics, Çanakkale Onsekiz Mart University, Çanakkale 17100, Türkiye.

International Journal of Molecular Sciences
|June 13, 2025
PubMed
Summary
This summary is machine-generated.

Lactoperoxidase (LPO) is a key enzyme in mammalian self-defense, found in milk and other secretions. This review explores LPO

Keywords:
antibacterialantifungalantiviralenzymelactoperoxidasemilkoxidationtherapeutic

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Area of Science:

  • Biochemistry
  • Enzymology
  • Immunology

Background:

  • Lactoperoxidase (LPO) is a mammalian heme peroxidase found in milk, saliva, tears, and airways.
  • It plays a crucial role in the innate immune system of mammals.
  • LPO catalyzes the oxidation of thiocyanate (SCN⁻), iodide (I⁻), and bromide (Br⁻) in the presence of hydrogen peroxide (H₂O₂).

Purpose of the Study:

  • To provide a comprehensive overview of the enzyme Lactoperoxidase (LPO).
  • To discuss the biological significance and research progress of LPO and the lactoperoxidase system (LPOS).
  • To explore the potential applications of LPO in various fields.

Main Methods:

  • Literature review synthesizing information from both recent and older studies.
  • Discussion of the chemical properties of LPO, H₂O₂, and SCN⁻.
  • Analysis of the antimicrobial mechanisms and biological roles of LPO.

Main Results:

  • The lactoperoxidase system (LPOS), comprising LPO, H₂O₂, and SCN⁻, generates potent antimicrobial products like hypothiocyanite (OSCN⁻) and hypoiodite (OI⁻).
  • LPO contributes significantly to mammalian self-defense, with its absence linked to increased disease frequency (inflammation, tumors, obesity).
  • LPO demonstrates broad antimicrobial activity against bacteria, viruses, and fungi.

Conclusions:

  • LPO possesses significant potential for applications in food preservation, oral care, and medical treatments.
  • Further research into LPO and LPOS could lead to novel strategies for disease prevention and health improvement.
  • Understanding LPO's role is vital for animal health and developing new therapeutic interventions.