A Caltech Library Service

Studies on the Mode of Enzyme Catalysis and the Hydrolysis of Bis-P-Dimethylaminobenzalazine


Lutwack, Ralph (1955) Studies on the Mode of Enzyme Catalysis and the Hydrolysis of Bis-P-Dimethylaminobenzalazine. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/CA38-8B92.


The alpha-chymotrypsin catalyzed hydrolysis of four L-tyrosinhydrazides at 25[degrees]C have been studied. The values of the kinetic constants K[subscript s] and k[subscript 3] for L-tyrosinhydrazide, acetyl L-tyrosinhydrazide, and nicotinyl L-tyrosinhydrazide have been evaluated by the usual procedure. The values of these constants for benzoyl L-tyrosinhydrazide have been obtained by the method of competitive hydrolysis. The procedure for the quantitative determination of hydrazine by the reaction with p-dimethylaminobenzaldehyde to form the corresponding azine has been adapted to the study of the rate of the hydrolysis of alpha-amino acid hydrazides. The rates of formation and of hydrolysis of bis p-dimethylaminobenzalazine have been studied under various conditions. The effects of dielectric constant, ionic strength, acid concentration, and temperature on the rate of hydrolysis have been investigated. The acid dissociation constants for p-dimethylaminobenzaldehyde in two distinct ethanol-water systems have been determined. The acid dissociation constants for the hydrazone and the azine of p-dimethylaminobenzaldehyde have been obtained. The value of the constant for the assumed aldehyde- hydrazine- hydrazone equilibrium has been calculated.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Chemistry and Physics)
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Niemann, Carl G.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1955
Record Number:CaltechETD:etd-01262004-093505
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:346
Deposited By: Imported from ETD-db
Deposited On:28 Jan 2004
Last Modified:06 Jul 2023 17:45

Thesis Files

PDF (Lutwack_r_1955.pdf) - Final Version
See Usage Policy.


Repository Staff Only: item control page