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Phosphatbestimmung in Phosphatstärken
Author(s) -
Kessel H.
Publication year - 1972
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.19720240204
Subject(s) - metaphosphate , chemistry , pyrophosphate , phosphate , sodium molybdate , ethylene glycol , reagent , molybdate , sodium phosphates , inorganic chemistry , nuclear chemistry , organic chemistry , enzyme
Determination of Phosphate in Starch Phosphates. The knowledge of the total, free and bound phosphate is needed for an exact characterization of starch phosphates. For the determination of the total amount of phosphate, the decomposition of the sample is carried out with ethylene glycol and sodium peroxide in a micro‐steelcylinder under pressure. The determination of the free phosphate is made by the transformation of the excess of pyrophosphate and metaphosphate into orthophosphate with a separate weighed portion. The photometric determination of phosphorus in both cases takes place with vanadate‐molybdate‐reagent. The bound phosphate corresponds to the difference (P total —P tree ) and is related to the average degree of substitution and esterification of the product.