摘要:

The first part of this paper is concerned with a quantitative investigation of the reaction of various polynuclear aromatic hydrocarbons with maleic anhydride. In the second part a micromethod for the separation of mixtures of polynuclear aromatic hydrocarbons, based on this reaction, is described. These studies were undertaken in anticipation that such mixtures might occur in carcinogenic extracts from biological sources.

ISSN:1923-4287    

DOI:10.1139/cjr48b-074

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Kuhn and Winterstein reported the isolation of 2,6-dimethylnaphthalene from the products of pyrolysis of carotenoid pigments. The production of alkyl derivatives of phenanthrene and chrysene by the same type of cyclization can readily be formulated. The production of such hydrocarbons by the action of heat on naturally occurring substances, which include common constituents of foodstuffs would be of significance since such compounds might exhibit carcinogenic activity. Fractionation of the products of carotene pyrolysis confirmed the formation of 2,6-dimethylnaphthalene, but no more complex polynuclear aromatic hydrocarbons were isolated. The methods of analysis employed should have permitted the detection of such compounds in amounts considerably below 1%.

ISSN:1923-4287    

DOI:10.1139/cjr48b-075

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The range in aluminum of the β−radiation of S35has been determined and found to be 32.2 ± 0.3 mgm. per cm2. Using various range–energy relations the maximum energy has been estimated to be 169 ± 5 kev.

ISSN:1923-4287    

DOI:10.1139/cjr48b-076

出版商:NRC Research Press    

年代:1948

数据来源: NRC