Jump to content

  • Quick Navigation
Photo

Calculating pH in the aqueous phase of smoked herring

Share this

  • You cannot start a new topic
  • Please log in to reply
3 replies to this topic
- - - - -

Conny T

    Grade - AIFSQN

  • IFSQN Associate
  • 45 posts
  • 4 thanks
0
Neutral

  • Denmark
    Denmark
  • Gender:Female
  • Interests:Photography, nature

Posted 16 May 2012 - 01:06 PM

Conducting a risk-analysis for producing smoked herrings in vegetable oil I have come to think if I can calculate the pH in the aqueoous phase of the fish?

As product is in oil it is hard measuring a pH that we can trust. But I thought that if we measure dried matter and acid on the herring we would be able to find the acid in the aqueous phase - and then calculate the pH from that......

Do I have a point?



Simon

    IFSQN...it's My Life

  • IFSQN Admin
  • 12,826 posts
  • 1363 thanks
880
Excellent

  • United Kingdom
    United Kingdom
  • Gender:Male
  • Location:Manchester
  • Interests:Married to Michelle, Father of three boys (Oliver, Jacob and Louis). I enjoy cycling, walking and travelling, watching sport, especially football and Manchester United. Oh and I love food and beer and wine.

Posted 17 July 2012 - 07:49 PM

Can anyone assist Conny with this technical question?

Thanks,
Simon


Get FREE bitesize education with IFSQN webinar recordings.
 
Download this handy excel for desktop access to over 180 Food Safety Friday's webinar recordings.
https://www.ifsqn.com/fsf/Free%20Food%20Safety%20Videos.xlsx

 
Check out IFSQN’s extensive library of FREE food safety videos
https://www.ifsqn.com/food_safety_videos.html


MicroMike

    Grade - Active

  • IFSQN Active
  • 8 posts
  • 4 thanks
0
Neutral

  • Scotland
    Scotland

Posted 21 July 2012 - 06:29 PM

It's possible, but the easiest might be just to macerate the product, use a separation funnel and wait for the oil and water to separate out, then measure the pH of the water.If you know the acid concentration, wet weight and dry weight I.e. how much water is there and the acid concentration, you can work out the concentration of hydrogen ions. pH is -log10 of the hydrogen ion concentration in water. You can only do it if you know what type acid is present because they can dissociate into hydrogen ions and anions differently.
HTHMike




Thanked by 1 Member:

Conny T

    Grade - AIFSQN

  • IFSQN Associate
  • 45 posts
  • 4 thanks
0
Neutral

  • Denmark
    Denmark
  • Gender:Female
  • Interests:Photography, nature

Posted 23 July 2012 - 07:17 AM

We do not have the equipment for separation but can analyze the acid. Will try to do it this way. Thanks :smile:





Share this

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users