Polarographic Monitoring of Differential Reaction Rates. Determination of Δ⁴-3-Ketosteroids in the Presence of Δ^1,4-3-Ketosteroids.

Synergistic Effects in Analyses Based on Differential Reaction Rates.

“…For the analysis of mixtures, the wide applicability of the graphical method based on rates of reaction has been demonstrated (1)(2)(3)(4)(5)(6)(7)(8)(8)(9)(10)(11). When using this method for binary mixtures, it was noted that in some cases the slope of the second portion of the rate plots, the linear portion which represents the rate of reaction of the slower component after essentially all the faster component has reacted, deviated significantly from the slope of the rate plot when the same material reacted alone, using the same initial concentra-tion of reactants, a and 6 (8).…”

Spectrophotometric methods for monitoring the microbial transformation of steroids. II. Absorbance ratio spectrophotometric determination of per cent conversion of 9α‐fluoro‐16α‐hydroxyhydrocortisone to 9α‐fluoro‐16α‐hydroxyprednisolone

“…In a previous paper' we have described a method for the determination of 9a-fluorohydrocortisone (I) and 9a-fluoro-16a-hydroxyhydrocortisone (11) in fermentation broths.…”