The nature of the sugar residue in the hexosemonophosphoric acid of muscle

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Abstract
The hexosephosphoric acid of normal muscle-press juice from rabbit, goat and donkey is a monophosphoric acid. The diphosphoric acid is only obtained when the fermentative resynthesis using NaF is employed. Evidence on the nature of the sugar residue in hexosemonophosphoric acid was obtained by oxidation to the corresponding hexonic acid by the use of bromine, and the subsequent removal of the phosphoric acid group with 10% H2SO4 in a sealed tube at 100[degree]. The pure hexonic acid showed changes in specific rotation when heated similar to those obtained with gluconic acid when similarly treated, from which it is concluded that the aldose of hexosemonophosphoric acid is d-glucose. The Willstatter-Schudel oxidation indicates the presence of 90% aldose in the hexose of the acid, and since after the oxidation the solution still reduced Fehling''s solution the presence of a ketose accounting for the remainder of about 10% is indicated.

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