Wikipedia states " Phytic acid and phytate have a strong binding affinity to the dietary minerals, calcium, iron, and zinc, inhibiting their absorption.[1]" Sigma-Aldrich sells USP grade phytic acid solution and has not purity listed. I expect the color is due to binding to a trace metal contaminate.
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-----Original Message----- From: Monona Rossol Phytic acid is described in the literature as a yellow to brownish liquid. There is a thread on the American Institute for Conservation's (AIC) forum about art conservators switching away from Sigma's phytic acid more brownish acid to another provider's whose phytic acid is pale yellow. The assumption is the Sigma product has "degraded." Danged if I have a clue. I just know as vegetarian, I eat more of it than they do. Does anyone out there have a clue what this reagent color difference actually is? Monona --- ---
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Subject: [DCHAS-L] wondering where the yellow went
Re: wondering where the yellow went
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