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Related Experiment Videos

Interaction between thiamine hydrochloride and lipoic acid.

H O Ammar, H A Salama

    Die Pharmazie
    |January 1, 1977
    PubMed
    Summary

    Thiamine hydrochloride and DL-alpha-lipoic acid form a 1:1 complex in water. This complex dissociates at higher temperatures, as shown by spectrophotometric and vapor pressure studies.

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    Area of Science:

    • Biochemistry
    • Physical Chemistry

    Background:

    • Thiamine hydrochloride (vitamin B1) and DL-alpha-lipoic acid are essential compounds.
    • Understanding their interactions in solution is crucial for various applications.

    Purpose of the Study:

    • To investigate the interaction between thiamine hydrochloride and DL-alpha-lipoic acid in aqueous solution.
    • To characterize the complex formed and determine its stability.

    Main Methods:

    • Spectrophotometric analysis
    • Vapor pressure measurements at different temperatures (25°C and 60°C)

    Main Results:

    • Evidence of a 1:1 complex formation between thiamine hydrochloride and DL-alpha-lipoic acid.
    • Determination of the complex's stability constant (3.1 x 10^4) and molar extinction coefficient (970 at 244 nm) at 25°C.
    • Observation of near-complete complex dissociation at 60°C.

    Conclusions:

    • Thiamine hydrochloride and DL-alpha-lipoic acid form a stable 1:1 complex in aqueous solution at room temperature.
    • The complex is temperature-sensitive and dissociates significantly at elevated temperatures.

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