Book Review: Quantitative Bestimmung organischer funktioneller Gruppen(Quantitative determination of organic functional groups). By R. Kaiser

1967 ◽  
Vol 6 (10) ◽  
pp. 892-893
Author(s):  
G. Hesse
Keyword(s):  
Quantitative Determination ◽  
Functional Groups ◽  
Organic Functional Groups ◽  
Quantitative Bestimmung

Quantitative Bestimmung der hydrierten Pterine und des Xanthommatins in den Augen von Ceratitis capitata WIED (Dipt. Trypetidae)

1965 ◽  
Vol 20 (4) ◽  
pp. 318-322 ◽  
Author(s):  
Irmgard Ziegler ◽  
M. Feron
Keyword(s):  
Quantitative Determination ◽  
Ceratitis Capitata ◽  
Male And Female ◽  
The Third ◽  
Quantitative Bestimmung ◽  
Drastic Increase

In the eyes of male and female flies a quantitative determination of the tetrahydropterin, the corresponding dihydro-compound (Sepiapterin) and of xanthommatin from 0—5 days after hatching was made. The increase of xanthommatin almost stops 24 hours after hatching; about 13 μg are present after that time. The tetrahydropterin, after a drastic increase during the first 24 hours, remains at a level of about 1,1 — 1,2 µg. In contrast the dihydrocompound which is nearly absent at the time of hatching is deposited on the eye-granules between the third and fifth day. At that time, especially in the male the dihydropterin/tetrahydropterin ratio is increased. Starvation during the first 24 hours has essentially no effect on the amount of xanthommation whereas the amount of pterins is markedly reduced.

scholarly journals Detection and Quantitative Determination of Alkylnaphthalenes in Latakia Tobacco/ Nachweis und quantitative Bestimmung von Alkylnaphthalinen in Latakia-Tabak

1982 ◽  
Vol 11 (3) ◽  
Author(s):  
G. Nicolaus ◽  
H. Elmenhorst
Keyword(s):  
Quantitative Determination ◽  
Retention Indices ◽  
Kováts Retention Indices ◽  
Ms Analysis ◽  
Quantitative Bestimmung ◽  
First Time

AbstractNaphthalene and alkylnaphthalene were detected qualitatively and quantitatively for the first time in Latakia tobacco. 62 different alkylnaphthalenes were determined by means of GC-MS analysis, 22 of which were exactly allocated structurally by comparing the Kovats retention indices. Besides naphthalene, the following substances were also identified: 1-methylnaphthalene, 2-methylnaphthalene, 1-ethylnaphthalene, 2-ethylnaphthalene, 1-propylnaphthalene, 2-propylnaphthalene, all ten theoretically possible isomers of dimethylnaphthalene, four trimethylnaphthalenes, isobutylnaphthalene and five ethylmethylnaphthalenes. The concentration of the naphthalenes detected in Latakia tobacco is in the region of 1 ppm to 10 ppm, with the focus on 1 ppm to 3 ppm. Alkylnaphthalenes make an important contribution to the aroma of the Latakia tobacco. They clearly modify the burnt aroma of the Latakia phenols to mild, dusty, with earthy undertone.

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