Showing papers by "Takeru Higuchi published in 1962"

TL;DR: The pH-rate profile of the hydrolytic cleavage of thiamine determined from kinetics measurements has been found to be unusually complex and appears not to be subject to major negative or positive catalysis by amino acid species.

TL;DR: Theoretical and experimental studies relating the relative stability of solid vitamin A derivatives to their melting points have shown that resistance toward degradation increases with fusion temperature as mentioned in this paper, which is attributed to the part that crystal lattice energy plays in stabilizing these compounds, and is supported by the fact that the solution stabilities of the derivatives appear to be generally comparable.

TL;DR: The rate of degradation of epinephrine in aqueous solution at pH 5 by molecular oxygen has been shown to be extremely complex function of both the amine and oxygen concentrations.

TL;DR: The apparent first-order rate constant corresponding to the hydrolysis of niacinamide has been determined over the pH range 0.4–11.3 in purely aqueous solutions at 89.4.

TL;DR: Autoxidation of BAL is shown to take place in the absence of metallic catalysts and the reaction was found to approach true zero order only at higher initial BAL concentration.

TL;DR: Investigations into the mechanism and kinetics of melting and crystallization of the stable form of methyl stearate as followed by changes in its specific volume have shown that the melting behavior was a sensitive function of its immediate history in a manner not associated with polymorphic transitions.

TL;DR: Bisulfite reduction of p-nitrobenzyl alcohol appears to follow a Piria mechanism leading to formation of α-hydroxy-6-sulfoamino-m-toluenesulfonic acid, with preliminary kinetic studies indicating an apparent heat of reaction of about 22 Kcal.