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- W2067112074 abstract "The stability of N-[(morpholine)methylene]-daunorubicin hydrochloride (MMD) was investigated in the pH range 0.44−13.54, at 313, 308, 303 and 298 K. The degradation of MMD as a result of hydrolysis is a pseudo-first-order reaction described by the following equation: ln c = ln c0 – kobs. t. In the solutions of hydrochloric acid, sodium hydroxide, borate, acetate and phosphate buffers, kobs = kpH because general acid-base catalysis was not observed. Specific acid-base catalysis of MMD comprises the following reactions: hydrolysis of the protonated molecules of MMD catalyzed by hydrogen ions (k1) and spontaneous hydrolysis of MMD molecules other than the protonated ones (k2) under the influence of water. The total rate of the reaction is equal to the sum of partial reactions: kpH = k1 • aH+ • f1 + k2 • f2 where: k1 is the second-order rate constant (mol−1 l s−1) of the specific hydrogen ion-catalyzed degradation of the protonated molecules of MMD; k2 is the pseudo-first-order rate constant (s−1) of the water-catalyzed degradation of MMD molecules other than the protonated ones, f1 – f2 are fractions of the compound. MMD is the most stable at approx. pH 2.5." @default.
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- W2067112074 date "2011-11-29" @default.
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- W2067112074 title "Acid-base catalysis ofN-[(morpholine)methylene]daunorubicin" @default.
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- W2067112074 doi "https://doi.org/10.3109/03639045.2011.637053" @default.
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