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Subject: [DCHAS-L] wondering where the yellow went
Date: Thursday, August 20, 2020 at 9:28:57 AM
Author: DCHAS Membership Chair <membership**At_Symbol_Here**DCHAS.ORG> 		Next by Date:
Subject: Re: [DCHAS-L] [EXT] Re: [DCHAS-L] New Video Series | ACS Matters | August 18, 2020
Date: Thu, 20 Aug 2020 10:24:00 -0400
Author: DCHAS Membership Chair

From: Paul Weller <wellerp**At_Symbol_Here**elon.edu>
Subject: Re: [DCHAS-L] wondering where the yellow went
Date: Thu, 20 Aug 2020 13:39:50 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
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In-Reply-To <1B5C0032-949B-4200-A413-C988C082BCFE**At_Symbol_Here**dchas.org>


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.

Paul Weller

Paul Weller
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Elon University
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-----Original Message-----
From: ACS Division of Chemical Health and Safety On Behalf Of DCHAS Membership Chair
Sent: Thursday, August 20, 2020 9:29 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: [DCHAS-L] wondering where the yellow went

From: Monona Rossol
Re: wondering where the yellow went

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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