摘要:

The rate of delignification of resin extracted spruce wood-meal has been determined in calcium-base sulphite liquor at temperatures from 130 °C. down to 50 °C. No break was found in the temperature coefficient curve at the lower temperatures, the reaction following the Arrhenius equation closely. Possible mechanisms of the reaction are discussed in the light of existing theories, and the effect of temperature on the yield of pulp is pointed out for its practical interest.

ISSN:1923-4287    

DOI:10.1139/cjr39b-019

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Fromm's method for the determination of minute amounts of pyrrole has been modified and applied to the determination of pyrrole produced by the dry distillation of various substances. The pyrrole obtained from gelatin is derived entirely from the proline and hydroxyproline which it contains. Enzymatic, acid, or alkali hydrolyzates of gelatin, gliadin, and glutenin, contain no detectable amount of free pyrrole. Sodium peroxide markedly increases the yield of pyrrole obtained in the dry distillation of gelatin. The addition of copper sulphate catalyzes the oxidation of proline to pyrrole by sodium peroxide.

ISSN:1923-4287    

DOI:10.1139/cjr39b-020

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Hydroxyproline is oxidized by sodium peroxide, if copper or cobalt is present, to give an unstable red chromogen which, in hot acid solution, can be condensed with isatin to form a stable red complex. The conditions are described which permit the direct application of this reaction to the quantitative estimation of hydroxyproline in acid or alkali hydrolyzates of gelatin. By this method moisture-free gelatin is found to contain 14.65% of hydroxyproline.

ISSN:1923-4287    

DOI:10.1139/cjr39b-021

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

A colorimetric method for the determination of proline is described. The procedure involves the oxidation of proline with lead peroxide and the condensation of the oxidation product withp-dimethylaminobenzaldehyde to give a red compound. The oxidation product can, if desired, be separated by steam distillation before applying the colour reaction. The method is limited in application to proteins which contain little or no hydroxyproline. By this method casein is found to contain 7.94% of proline.

ISSN:1923-4287    

DOI:10.1139/cjr39b-022

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr39b-023

出版商:NRC Research Press    

年代:1939

数据来源: NRC