What can cause the m-FC with Rosolic Acid media to turn pink, but not exhibit any growth?

Document ID

Document ID TE5316

Version

Version 5.0

Status

Status Published

Published Date

Published Date 08/09/2019
Question
What can cause the m-FC with Rosolic Acid media to turn pink, but not exhibit any growth?
Summary
m-FC with Rosolic Acid media turns pink, but has no growth
Answer

INTERNAL/AUTHORIZED SERVICE PROVIDER INFORMATION DO NOT FORWARD TO CUSTOMER

In the past, customers have reported that the m-FC with Rosolic Acid media  (Product # 2428550 ) turns pink, but does not exhibit any growth.

While this phenomenon has been reported in the past, the exact cause is unknown.

Our microbiology team has seen pink plates in years past, but we have not been able to intentionally duplicate (with any particular organism, including Pseudomonas or Bacillus) this color formation in the lab.

There is a theory that irradiated plates with absorbant pads may be interacting with the media or the organisms even though there isn't any growth to cause the pink color. We currently use Ethylene Oxide sterilized plates with pads, and since this switch from a couple years ago, there has been no reoccurances of the pink color formation in our labs.

 

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