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Polyphosphates as synergistic antioxidants
Author(s) -
Watts Betty M.
Publication year - 1950
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02634877
Subject(s) - pyrophosphate , chemistry , antioxidant , polyphosphate , aqueous solution , sodium hexametaphosphate , phosphate , food science , inorganic chemistry , biochemistry , sodium , organic chemistry , enzyme
Summary and Conclusions The antioxidant activities of a number of synergists were measured in aqueous fat systems at several pH values. A group of polyphosphates not previously investigated was most promising of the synergists tried. Orthophosphates were ineffective but antioxidant activity increased from pyrophosphate through tri and “heptaphosphate” and finally to the most active “hexametaphosphate” and Maddrell's salt. Citrate compared with triphosphate and pyrophosphate in antioxidant activity; all other synergists tried were less effective than pyrophosphate. Relatively large molar concentrations of orthophosphates interfered markedly with the antioxidant activity of citrate and the higher polyphosphates. The polyphosphates also inhibited rancidity in the presence of added copper and iron but did not eliminate the catalytic effect of the metals. Antioxidant activity of the phosphates in dry fats did not parallel their activity in aqueous fat systems. Properties of polyphosphates which might affect their use as antioxidants in foods are discussed.