title: Identification of 4,6-O-(1-carboxyethylidene)-D-galactose by combined gas chromatography mass spectrometry.
abstract: Combined gas chromatography mass spectrometry was used to separate and identify a carrageenan component suspected of being the acid ketal 4,6-O-(1-carboxyethylidene)-D-galactose. The mass spectral fragmentation pattern is presented as evidence of the presence of this component in the carrageenan from Petrocelis middendorfii (P. franciscana).
mesh_terms: D001704:Biopolymers; D002351:Carrageenan / Q000032:analysis; D002849:Chromatography, Gas; D005690:Galactose / Q000031:analogs & derivatives*; D008401:Gas Chromatography-Mass Spectrometry; D013058:Mass Spectrometry / Q000379:methods*
chemical_list: D001704:Biopolymers; D002351:Carrageenan; D005690:Galactose