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  • 1
    Electronic Resource
    Electronic Resource
    Role of the molecular weight and the composition on the hydrolysis kinetics of monolayers of poly(α-hydroxy acid)s (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 709-718 
    Details
    ISSN: 1435-1536
    Keywords: Key words Basic hydrolysis ; Monolayer ; Poly(α-hydroxy acid)s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The hydrolysis kinetics of spread insoluble monolayers of poly(α-hydroxy acid)s with various molecular weights and lactic acid–glycolic acid molar ratios was followed by measuring simultaneously the decrease in the surface area at constant surface pressure and the evolution of the surface potential. The interfacial hydrolysis at alkaline pH leads to the progressive fragmentation of the polymer molecules and the appearance of charged insoluble products (detected by measuring the surface potential) and small soluble fragments (detected by measuring the decrease in the surface area). The data obtained by both approaches were interpreted in the framework of the random scission model. The rates of hydrolysis are larger for polymers with smaller initial polymerization numbers and increase with the decrease in the molar ratio of lactic acid units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050444
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Enzymatic hydrolysis of poly(D, L-lactide) spread monolayers by cutinase (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 449-457 
    Details
    ISSN: 1435-1536
    Keywords: Key words Poly(D ; L-lactide) ; spread monolayer ; enzymatic hydrolysis ; cutinase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The enzymatic hydrolysis of a model poly(D,L-lactide) by cutinase was studied by using a barostat surface balance. A theoretical approach based on the adaptation of the Michaelis–Menten scheme at the interface and a process of random fragmentation of the macromolecules was developed. The role of the interfacial organisation of the reaction products was discussed. Hydrolysis rate constant values and the specific activity were estimated and compared with those obtained for the hydrolysis of lipid monolayers. The process of fragmentation of the interfacial polymer structures was visualised by using AFM imaging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050103
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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