Bestimmung des Trigonellins im rohen und gerösteten Kaffee

Nottbohm, F. E.; Mayer, F.

doi:10.1007/bf01661376

Cited by 11 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The betaine-type compounds gave iodine-nitrogen ratios indicating their occurrence primarily as the heptaiodides. These formulas contrast with those ascribed to the isolated periodides of betaine (2) and of trigonelline (9) T h i s c o n t e n t i s Influence of pH on Yield of Periodides. When periodides from such betaine-type compounds as betaine and trigonelline were prepared in neutral solutions, low yields resulted, Stanek (12) demonstrated that the formation of periodide precipitates from betaine-type compounds is pH-sensitive as contrasted with that from quaternary amines.…”

Section: Standardmentioning

confidence: 81%

“…Although successful separations of specific quaternary nitrogen compounds on ion exchange resins have been reported, the methods employed were not designed for general application to many of these commonly occurring substances in biological extracts. Friedman et al (9) quantitatively separated carnitine and betaine on Dowex 50 in the hydrogen form but did not determine choline in their system. However, Pilgeram and coworkers (19) employed a similar procedure to resolve the choline, serine, and ethanolamine in phospholipide hydrol-yzates.…”

Section: Standardmentioning

confidence: 96%

“…Thiosulfate titration of the combined iodine has been preferred for measuring the yields of periodides of choline (6), betaine (£? ), and trigonelline (9). Appleton et al (1) observed that the periodide of choline in ethylene dichloride solution exhibits an absorption maximum in the ultraviolet at 365 µ and applied this finding to the determination of choline.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Spectrophotometric Determination of Betaines and Other Quaternary Nitrogen Compounds as Their Periodides

Wall¹,

Christianson²,

Dimler³

et al. 1960

Anal. Chem.

109

View full text Add to dashboard Cite

The use of the term ft, in contrast to /i, has not been entirely satisfactory. This is especially obvious in comparing the experimental deviations obtained by using Equations VI and VII. The possibility exists [as first pointed out to the authors by Kieselbach (8)] that the use of Ep0v0fi rather than Cv"f2 would prove more satisfactory in Equation VII. This follows from the fact that fi is a slowly varying function differing only slightly from unity at any time. The use of unity in place of fi, Equation VI, is, of course, very satisfactory. This explanation would constitute an argument in favor of the predominance of the E term. Some other factor might, however, be responsible for the deviations. The plate height contribution of the injection and detection devices cannot be held responsible, because the trend from larger to smaller values would be reversed, and this effect is as large as 10% only in extreme cases (as shown by measuring the peak width for short, blank columns, and extrapolating to zero length), and is usually much smaller. A great deal more experimental and theoretical work is needed on this subject.

show abstract

Section: Standardmentioning

confidence: 81%

Section: Standardmentioning

confidence: 96%

mentioning

confidence: 99%

See 1 more Smart Citation

Spectrophotometric Determination of Betaines and Other Quaternary Nitrogen Compounds as Their Periodides

Wall¹,

Christianson²,

Dimler³

et al. 1960

Anal. Chem.

109

View full text Add to dashboard Cite

show abstract

“…Several methods for the determination of trigonelline have been described in the literature (4,12,19,22,23). Their deficiencies are discussed briefly in the following paragraphs.…”

Section: Analytical Procedures For Trigonellinementioning

confidence: 99%

“…Precipitation Methods. The trigonelline method of Nottbohm and Mayer (19) involves precipitation of trigonelline with iodine from a chlorogenic acid and caffeine-free coffee extract, and titration of the iodine complex in alcohol with thiosulfate. The iodine precipitation requires a high concentration of trigonelline for quantitative results.…”

Section: Analytical Procedures For Trigonellinementioning

confidence: 99%

Determination of Trigonelline in Coffee

Moores¹,

Greininger²

1951

Anal. Chem.

View full text Add to dashboard Cite

Über den Trigonellin‐ und Nikotinsäuregehalt in Semen Foenugraeci

Kuhn

Hamprecht

1943

Archiv der Pharmazie

View full text Add to dashboard Cite

llber den Gehalt der Semen Foenugraeci liegt lediglich eine Untersuchung von J a h n s (1) aus .dem Jahre 1885 vor, a d die sioh auch dar Kommentar zum DAB. 6 (2) bezieht und bei der 0.13% Trigonellin angegeben wird. Im Hinblick auf das Interesse, we1che.s Trigonellin heute als Abkommling der Nikotinsiivse und b i t als moglicher PP$aktor findet..schien e& Nachpriifung dieser Gehaltsangabe interessant. Ober ,die Pellagrawirksdeit des Trigonellins hat neuerdings I. K ii h n a 'u (7) eine ausfuhrliche Untersuchung mgestellt, in der er einleitend darauf hinweist. daD Bock&ornsamen im Schutzversuch am Menschen ,cine gute Pellagrawinksamkeit besitzen, wiihrend ihr Nikotinsauregehalt sehr gering oder gleich Null ist. Auch I. K ii h n a u be-Lieht sich hinsichtlich des Triganellingehaltes auf die alte Angabe von J a h n s. Nachdem S l o t t a und N e i s s e r (3) eine Methode zur Bestimmung des

show abstract

Bestimmung des Trigonellins im rohen und gerösteten Kaffee

Cited by 11 publications

References 11 publications

Spectrophotometric Determination of Betaines and Other Quaternary Nitrogen Compounds as Their Periodides

Spectrophotometric Determination of Betaines and Other Quaternary Nitrogen Compounds as Their Periodides

Determination of Trigonelline in Coffee

Über den Trigonellin‐ und Nikotinsäuregehalt in Semen Foenugraeci

Contact Info

Product

Resources

About