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Effect of Water Activity upon Electron‐Radiolysis of Dextran
Author(s) -
Adam S.,
Blankenhorn R.,
Diehl J. F.
Publication year - 1979
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19790311207
Subject(s) - chemistry , yield (engineering) , radiolysis , aqueous solution , dissolution , irradiation , dextran , nuclear chemistry , solvated electron , chromatography , organic chemistry , materials science , physics , nuclear physics , metallurgy
Irradiation of drydextran(M̄ w = 40000)to doses of 50 kGy (5 Mrad) and dissolution in water yields 5‐deoxy‐xylo‐hexodialdose (83 μ/, G = 0.10) and glucose (47μ/g, G = 0.05). In addition, threotetrodialdose and threonic acid lactone were identified after reduction to the combined product threitol(12μ/g, G = 0.02). With increasing water activity ( a w ) the formation of the main product 5‐deoxy‐xylo‐hexodialdose decreases continually to result in a yield of 17 μ/g dry material when dextran is irradiated in a 30% aqueous solution ( a w = 0.97). In contrast, the formation of threitol exhibits a fairly linear increase with increasing a w , resulting in a yield of 42 μ/g dry material in the 30% solution. The formation of glucose remains constant in the range of O ≦ a w ≦ 0.76 and shows only a minute increase, when irradiated in a 30% aqueous solution. Possible reaction mechanisms responsible for the observed yield shifts are discussed.