Formulation of vaccine adjuvant muramyldipeptides (MDP). 2. The thermal reactivity and pH of maximum stability of MDP compounds in aqueous solution

The degradation of muramyldipeptides (MDPs) in aqueous solution obeys the rate law kobs = kH+aH+ + ko + kHO-aHO- and the Arrhenius equation. For example, the rate constants for degradation of N-acetylmuramyl-L-threonyl-D-isoglutamine, 3, at 25 degrees C are kH+ = 2.3 X 10(-6) M-1 sec-1, ko = 8.2 X 1...

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Bibliographic Details
Published inPharmaceutical research Vol. 5; no. 8; p. 528
Main Authors Powell, M F, Foster, L C, Becker, A R, Lee, W
Format Journal Article
LanguageEnglish
Published United States 01.08.1988
Subjects
Acetylmuramyl-Alanyl-Isoglutamine - analysis
Adjuvants, Immunologic
Amino Acids - analysis
Chromatography, High Pressure Liquid
Drug Stability
Hydrogen-Ion Concentration
Kinetics
Solutions
Temperature
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Summary:The degradation of muramyldipeptides (MDPs) in aqueous solution obeys the rate law kobs = kH+aH+ + ko + kHO-aHO- and the Arrhenius equation. For example, the rate constants for degradation of N-acetylmuramyl-L-threonyl-D-isoglutamine, 3, at 25 degrees C are kH+ = 2.3 X 10(-6) M-1 sec-1, ko = 8.2 X 10(-10) sec-1, and kHO- = 0.19 M-1 sec-1. The degradation rates are dependent on the side-chain substituents; it is predicted that sterically hindered MDP compounds will show an extended shelf life in aqueous solution. Product studies in the weakly acid pH region (where the pH of maximum stability occurs) show that MDP compounds degrade largely by hydrolysis of the dipeptide side chain. These data show that MDP 3 exhibits a shelf life (t90) of greater than 2 years in aqueous solutions of pH 4-4.5, the pH of maximum stability.
ISSN:0724-8741
DOI:10.1023/A:1015929610687