[Histonet] "cooked" biopsy

[Tony Henwood (SCHN)]

Hi Paula,

We can check the purity of the xylene quite easily:

Xylene Purity Test Procedure 

Note: The recommended and most accurate method of determining the purity of the recycled xylene is by doing a Gas Chromatography analysis.  The following method can be used to obtain an acceptable confidence level in the purity of the recycled xylene (CBG Biotech).

Testing Procedure

1.	To a clean, dry 100 ml mixing cylinder graduate, add sufficient recovered xylene so that the bottom of the meniscus is aligned with the top edge of the 85 ml mark on the graduate. 

2.	Add water to the graduate until the bottom of the meniscus aligns with the top edge of the 100 ml mark on the graduate. At this point, 15 ml of water will have been added to 85 ml of recovered xylene.

3.	Stopper the graduate and invert the mixture.  Allow the mixture to settle, making sure that all of the water settles to the bottom of the graduate.  No water should remain clinging to the sides of the graduate above the xylene/water separation point. This separation point should be near the 15 ml level of the graduate. (Note: xylene floats on top of the water).

4.	Carefully inspect and record the point of separation between the water and xylene using the bottom of the meniscus as the separation point.

5.	Subtract 15 ml from the quantity of water indicated in step 5.  The remainder plus an additional 0.1 correction factor equals the percentage of recovered xylene impurities.

	EXAMPLE:

Xylene/Water separation point is indicated to be 15.5 ml.
(15.5 - 15) + 0.1 = 0.6% impurities.  
Therefore, the recovered xylene is 99.4% pure.


Regards
Tony Henwood JP, MSc, BAppSc, GradDipSysAnalys, CT(ASC), FFSc(RCPA)
Principal Scientist, the Children’s Hospital at Westmead
Adjunct Fellow, School of Medicine, University of Western Sydney
Tel: 612 9845 3306
Fax: 612 9845 3318
Pathology Department
the children's hospital at westmead
Cnr Hawkesbury Road and Hainsworth Street, Westmead
Locked Bag 4001, Westmead NSW 2145, AUSTRALIA

________________________________________
From: Paula via Histonet <histonet at lists.utsouthwestern.edu>
Sent: Thursday, 8 July 2021 04:53
To: 'Erick Rodriguez'
Cc: histonet at lists.utsouthwestern.edu
Subject: Re: [Histonet] "cooked" biopsy

Thank you, everyone...
I looked at my reagents and saw the color pink in the xylene, which tells me that there is water or too much water in it so I changed it.
We recycle xylene, so I need to get the recycler looked at now.
Thanks again,
Paula


-----Original Message-----
From: Erick Rodriguez [mailto:rodriguez.erick at icloud.com]
Sent: Wednesday, July 07, 2021 11:24 AM
To: Paula
Subject: Re: [Histonet] "cooked" biopsy

Did you change the processor reagents before running your tissues? Cooked tissue usually means the tissue wasn’t dehydrated properly and the leftover water boiled and fried your tissue. I would double check the alcohols.

> On Jul 7, 2021, at 11:00 AM, Paula via Histonet <histonet at lists.utsouthwestern.edu> wrote:
>
> Hello, good day,
>
>
>
> Our pathologist is complaining about the tissues today that they are
> "cooked, burnt, crushed, shrunken" those are the adjectives she is using.
>
>
>
> Can you tell me the cause?  Usually, the work comes out beautiful but today
> they are not. Nothing has changed on our processing times.
>
>
>
> What should I investigate?
>
>
>
> Thank you in advance,
>
> Paula
>
> Bio-Path Medica Group
>
>
>
> _______________________________________________
> Histonet mailing list
> Histonet at lists.utsouthwestern.edu
> http://lists.utsouthwestern.edu/mailman/listinfo/histonet


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