# Gelbstoff
## English
### Noun

Gelbstoff (uncountable)
* Alternative letter-case form of gelbstoff.
** 1966, K. Kalle, “The Problem of the Gelbstoff in the Sea”, in Oceanography and Marine Biology: An Annual Review, volume 4, Boca Raton, Fla.: CRC Press, →ISSN, →OCLC, article title, page 91:The problem of the Gelbstoff in the sea
** 1984, M. Ehrhardt, “Marine Gelbstoff”, in Otto Hutzinger, editor, The Natural Environment and the Biogeochemical Cycles (The Handbook of Environmental Chemistry; 1, part 1C), Berlin: Springer-Verlag, →ISBN; reprinted as Berlin, Heidelberg: Springer-Verlag, 2013, →DOI, →ISBN, pages 63 and 67:[page 63] Kalle concluded that dissolved yellow substances contribute substantially to any deviation from the blue colour of pure water into the longer wavelengths region of the visible spectrum. […] Chemically the material defied unequivocal characterization, a situation which has remained essentially unchanged. Thus, for want of a systematic designation Kalle called the material "Gelbstoff", the German word for "yellow material". […] Marine Gelbstoff is a material formed in the sea wit certain spectral characteristics. It is not derived from terrestrial sources and appears to be composed of fulvic and humic components both of which are structrally different from their terrestrial counterparts. […] [page 67] These are more indications of an autochthonous origin of marine Gelbstoff supported by the interesting observation that Gelbstoff from a bog water precipitated within a week at room temperature when an equal amount of seawater was added to its solution.

## German
### Etymology

gelb (“yellow”) +‎ Stoff (“material”)

### Pronunciation

* IPA: /ˈɡɛlpʃtɔf/
* Hyphenation: Gelb‧stoff

### Noun

Gelbstoff m (strong, genitive Gelbstoffes or Gelbstoffs, plural Gelbstoffe)
* (dated) A yellow pigment, especially a xanthophyll.
** 1864, Illustrirtes Allgemeines Gartenbuch. Vollständige Anleitung [...] . Ein Handbuch für Gärtner, Gartenfreunde und Landwirthe von H. Jäger, p. 22:
    Roth soll in manchen Fällen aus einer Oxydation des Gelbstoffs entstehen, was wol bei Orange sicher der Fall ist.In some cases, red is said to result from an oxidation of the yellow pigment, which is certainly the case with orange.
** 1875, Die chemisch-technischen Mittheilungen der neuesten Zeit, ihrem wesentlichen Inhalte nach alphabetisch zusammengestellt von Dr. L. Elsner. Neue Folge. Drittes Heft: Die Jahre 1873–1874. (Der ganzen Reihe XXIII. Heft) — Die chemisch-technischen Mittheilungen des Jahres 1873–1874, ihrem wesentlichen Inhalte nach alphabetisch zusammengestellt von Dr. L. Elsner, page 80:Es ist der einzige Gelbstoff, welcher diese Reaction giebt.It is the only yellow pigment that gives this reaction.
** 1875, Illustriertes Konversations-Lexikon. Vergleichendes Nachschlagebuch für den täglichen Gebrauch, vol. IV, p. 61 (s.v. Faulbaum)
    Die Rinde wirkt abführend, ebenso die Beere. Auch dienen beide, sammt den Blättern, zum Gelbfärben, da sie einen eigenen Gelbstoff, das Rhamnoxanthin, enthalten.The bark has a laxative effect, as does the berry. Both, including the leaves, are also used as yellow dye, since they contain a particular yellow pigment, rhamnoxanthin.
* Gelbstoff, the optically measurable component of dissolved organic matter in water, which primarily occurs naturally from tannin released from decaying detritus.
** 2013, Gerhard Rheinheimer, Meereskunde der Ostsee, page 110:Verglichen mit den komplexen und chemisch nur unvollkommen charakterisierten Gelbstoffen ist die Summe der Konzentrationen chemisch definierter, einzelner organischer Verbindungen im Ostseewasser gering.Compared with the complex and chemically only imperfectly characterized gelbstoffs, the sum of the concentrations of chemically defined individual organic compounds in the water of the Baltic Sea is low.

#### Declension

$^1$Now rare, see notes.

#### Descendants

* → English: gelbstoff