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Physical Properties of Alcohols and Phenols02:32

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Alcohols are organic compounds in which a hydroxy group is attached to a saturated carbon. Phenols are a class of alcohols containing a hydroxy group attached to an aromatic ring. The physical properties of the alcohols and phenols are influenced by hydrogen bonding due to the oxygen–hydrogen dipole in the hydroxy functional group and dispersion forces between alkyl or aryl regions of alcohol and phenol molecules.
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Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Characteristics of Precipitation-formed Polyethylene Glycol Microgels Are Controlled by Molecular Weight of Reactants
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Characteristics of Precipitation-formed Polyethylene Glycol Microgels Are Controlled by Molecular Weight of Reactants

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Propylene Glycol.

Sharon E Jacob, Andrew Scheman, Maria A McGowan

    Dermatitis : Contact, Atopic, Occupational, Drug
    |October 24, 2017
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    Summary
    This summary is machine-generated.

    Propylene glycol (PG) is increasingly common in products, causing allergic reactions. Awareness and proper patch testing are crucial for diagnosing PG sensitization and contact dermatitis.

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    Area of Science:

    • Dermatology
    • Toxicology
    • Cosmetic Science

    Background:

    • Propylene glycol (PG) is a common ingredient in cosmetics, medications, and food products.
    • Increasing use of PG has led to documented cases of allergic and irritant contact dermatitis.
    • PG's dual nature as a weak sensitizer and irritant complicates patch test interpretation.

    Purpose of the Study:

    • To raise awareness regarding Propylene glycol sensitization.
    • To provide guidance on appropriate testing and evaluation of Propylene glycol patch tests.

    Main Methods:

    • Review of documented cases and scientific literature on Propylene glycol reactions.
    • Analysis of PG's properties as a sensitizer and irritant.
    • Discussion of diagnostic challenges in Propylene glycol patch testing.

    Main Results:

    • Propylene glycol (PG) is recognized as a significant contact allergen.
    • Patch testing for PG can yield ambiguous results due to its irritant properties.
    • Systemic reactions to PG have been reported.

    Conclusions:

    • Increased clinical awareness of Propylene glycol sensitization is necessary.
    • Standardized and careful evaluation of PG patch tests is essential for accurate diagnosis.
    • Understanding PG's dual role is key to managing contact dermatitis.