Sequencing of xyloglucan oligosaccharides by partial Driselase digestion: the preparation and quantitative and qualitative analysis of two new tetrasac

Autor: E P, Lorences, S C, Fry
Rok vydání: 1994
Předmět:
Zdroj: Carbohydrate Research. 263:285-293
ISSN: 0008-6215
DOI: 10.1016/0008-6215(94)00170-7
Popis: The pentasaccharide (XXG), [formula: see text] obtained from Rosa xyloglucan, was converted to two isomeric tetrasaccharides, a and b (Xyl1.Glc3), by mild acid hydrolysis. During hydrolysis in 2 M trifluoroacetic acid at 90 degrees C, optimal yields of a and b were obtained after 20-40 min. Each tetrasaccharide was purified by preparative paper chromatography and high-pressure liquid chromatography (HPLC). The two isomers were distinguished by the products of their partial digestion with Driselase, which hydrolyses the glucosidic bonds sequentially from the non-reducing terminus: a and b yielded cellobiose and Xyl--Glc--Glc, respectively showing that they were [formula: see text] and [formula: see text] respectively. Tetrasaccharide b was chromatographically identical, upon HPLC on Dionex CarboPac PA1, with the tetrasaccharide produced from XXG by the action of Tropaeolum alpha-D-xylosidase, supporting the proposed structure. Xyloglucan oligosaccharides were assayed quantitatively by measurement of the yield of isoprimeverose (Xyl--Glc) after complete Driselase digestion.
Databáze: OpenAIRE