Grade - Active
Posted 07 June 2022 - 04:52 AM
Hi everyone
I have some question about the limit of pathogen in defference unit like
some standard is S. auresu = Not deteced in 0.1 g , another is S. aureus = Not detected in 10 g
I understand that not detected in 10 g is tighten (cover) 0.1 g , am i right ?
Not detected in 10 g > Not deteced in 0.1 g
Grade - FIFSQN
Posted 07 June 2022 - 04:58 AM
Hi Nuttawut.s,
Welcome to the IFSQN forums.
I think I’ve got the gist of your question. Not detected in 10g is a test that is 100 times more sensitive than not detected in 0.1g
Kind regards,
Tony
Edited by Tony-C, 07 June 2022 - 04:58 AM.
IFSQN Implementation Packages, helping sites achieve food safety certification since 2009:
Practical Internal Auditor Training for Food Operations - Available via the previous webinar recording. Fantastic value at $97/per person, but don’t take our word for it, read the Customer Reviews here
|
Thanked by 2 Members:
|
,
|
Grade - SIFSQN
Posted 13 June 2022 - 12:12 PM
Hi Nuttawut,
for assessment you need some more information e.g. the sampling plan etc.
example:
Salmonella-"free" is often written as n.d. in 25 g
The result can be based on
a) one sample of 25 g is taken from a large batch
b) 30x 25g samples are taken in a representative mode from the same batch -> is often written as n.d. in 25 g too
(we have performed such sampling by automatic valve during loading e.g. for chocolate)
From statistical point of view there is a huge difference for a risk assessment.
Example b is sometimes written as n..d in 750 g. But it will not become clear whether the result is based on one sample of 750 g or 30 samples of 25g.
The better way to write e.g. micro specs as n, c, m , M as described here on p 15
microbiological-specifications-nestle.pdf
Rgds
moskito
|
Thanked by 1 Member:
|
|
0 members, 1 guests, 0 anonymous users
