Systematic studies on the breakdown of p,p'-DDT in tobacco smokes. II. Isolation and identification of degradation products from the pyrolysis of p,p'-DDT in a nitrogen atmosphere

Abstract

To illustrate the utility with the mass spectra, categories that were known to be linearly separable when all mass peaks greater than 0.5 z were used were made inseparable by retention of only the 6 largest peaks in each spectrum. That is, the pattern set consisted of 630 spectra, each containing only the six most intense peaks in its mass spectrum.Surprisingly, most of the questions tried using only the 6 largest peaks were linearly separable and the two examples listed in Table IV were the only ones by which the use of a negative delta was required. However these adequately prove the superiority of the delta approach when compared with the threshold logic unit. In each case prediction is considerably better with the use of a no-decision region. The results for a C/H ratio of 1/2 are particularly striking, especially the difference between negative categories (93.4 % with delta as opposed to 72.7% without delta).

Insecticide residues in cigarette smoke. Transfer and fate in rats

“…The loss of radioactivity with cer-tain of the insecticides indicated that volatile pyrolysis products were formed which were not collected in the traps of the smoking apparatus (Figure 1). Loss of such compounds was reported in a study of the pyrolysis of DDT (Chopra and Osborne, 1971).…”

Systematic Studies on the Breakdown of p,p’-DDT in Tobacco Smokes: III. Isolation and Identification of the Non-Volatile Degradation Products of p,p’-DDT in p,p’-DDT-Treated Tobacco Smokes

“…The presence of all these compounds were confirmed as reported in the Experimental. It is also pertinent to note here that all of these compounds, with the exception of p,p'-dichlorobenzophenone, were isolated and identified by GLC and IR-spectroscopy in the pyrolysate from the pyrolysis of p,p'-DDT in a nitrogen atmosphere (3).…”

Gas chromatography

“…Pyrolysis has also been used in the characterization of human hair (240), nucleotides and nucleosides (937), ribonucleosides, ribonucleotides, and dinucleotides (988), acetylcholine in perfusates of the stimulated vagus nerve (377) and in nanogram amounts in the effluents from rat phrenic nervediaphragm preparation (819), antimycin A components (818), four fungi of the Aspergillus flavus group (966), antifungal antibiotics (152), peptides and sequence determination in actinomycins ( 631), (3-hydroxy amino acids (520), the microorganisms, micrococcus lutevs and Bacillus subtilis var. niger, to provide data that might be useful during a Mars landing planned for 1975 (855), lyophilized samples of 10 strains of Clostridium botulinum, types A, B, and E (195), fatty acids by in situ methylation by pyrolysis of their tetramethyl ammonium salts (886), fatty acid salts by analysis of the alkyl methyl ketones formed by the thermal decarboxylation reaction of long-chain fatty acid salts and acetates (678), arylsulfonic acids and salts (853), alkyl anilinium salts and cationic surfactants (947), p,p'-DDT in tobacco smoke (180), and naturally occurring materials-proteins, carbohydrates, and amino acids-typical of those that might be present in tobacco leaf (451).…”