Acceptable peroxide value in foods

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Acceptable peroxide value in foods

Started by sutan77, May 12 2015 11:50 PM

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sutan77

IFSQN Active

8 Replies

12 May 2015 - 11:50 PM

Hi

I would like to know the acceptable PV in foods such as nuts, high fat oil, shortening. I heard PV above 10 mEq/Kg will accelerate rancidity within storage time. Does anyone know if any references within food industries support this statement.

We are producing packed frying nuts, flat bread, chips. Rancidity always a big topic. It affected our FG. What is the best way to monitor rancidity as an indicator? PV is one of them but not clear what the limit is.

Thanks

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Charles.C IFSQN Moderator · Answer 1 · 2015-05-13T16:23:40+00:00

Hi

I would like to know the acceptable PV in foods such as nuts, high fat oil, shortening. I heard PV above 10 mEq/Kg will accelerate rancidity within storage time. Does anyone know if any references within food industries support this statement.

We are producing packed frying nuts, flat bread, chips. Rancidity always a big topic. It affected our FG. What is the best way to monitor rancidity as an indicator? PV is one of them but not clear what the limit is.

Thanks

Chemical analysis of Foods /Pearson (paraphrasing) states that fresh oils usually have peroxide values well below 10 mEq/kg. A rancid taste is often just noticeable for peroxide values between 10 and 20. However, in interpreting such figures, it is necessary to take into account the particular oil or fat involved.

Note that the text refers to 2 varieties of rancidity, oxidative and ketonic. The peroxide value is particularly associated with the former.

Other parameters such as the Iodine value are also relatable to tendencies to oxidative rancidity.

IMEX of frying oils, FFA is a convenient process monitor. Opinions vary as to limits (and also depending on the process/food/oil type/customer). Values in the 1-2% range are quite common IMEX for refined oils.

sutan77 IFSQN Active · Answer 2 · 2015-05-14T03:36:34+00:00

Hi Charles

Thank you for your response

Agreed to the point of original manufacturer positive release of PV from supplier perspective. Refined oil or high fat products/raw material PV result approx 0.01 to 2 mEqO2/Kg. I believe the result was taken from the day of RM manufactured.

As customer perspective or secondary manufacturer would be different. We could received the RM 6 months after the RM manufactured. I don't think PV value in the original COA is acceptable.

One example case, we received peanuts with 4 months left of shelflife. The COA result is 0.1 mEq/kg and spec from original manufacturer stated PV <3 mEq/kg. We tested the peanut upon delivery and the result was 5.8 mEq/Kg. Technically it is out of spec but nothings wrong with the product.

I would like to set the acceptable PV value from customer or secondary manufacturer perspective. Hope there were industrial reference to support statement of "A rancid taste is often just noticeable for PV between 10-20" hence I can mitigate product rancidity risk by setting-up rejection level from PV.

Kind Regards

Sutan77

Charles.C IFSQN Moderator · Answer 3 · 2015-05-14T05:30:04+00:00

If you receive oil where the PV is not compliant with the seller’s spec. I suppose you have grounds for complaint.

Regarding rancidity, do note the PV caveat in my previous quote. Presumably based on the author's experience.

The spec. you mention was perhaps optimistic as, for example, compared to Codex, eg –

Codex STAN 210.pdf 909.07KB 574 downloads

Some other specs seem even more "cautious", eg -

tpeanut_nf.pdf 74.96KB 354 downloads

Maybe there is a cost-related aspect also ? :dunno:

dv8dawn IFSQN Member · Answer 4 · 2015-05-14T08:16:52+00:00

dv8dawn

IFSQN Member

#5

14 May 2015 - 08:16 AM

^{Wow thats quite informative...thanks buddy!}

sutan77 IFSQN Active · Answer 5 · 2015-05-15T00:25:42+00:00

Thanks Charles!!! The codex document is really informative. I can use it as reference of acceptable PV after storage.

The spec from original manufacturer was not optimistic but more realistic from my perspective. If they put <10mEq/Kg as acceptable PV after manufacturer means no storage time allowed. If the shelflife of RM is 12 months and manufacturer would release RM with 9.88 mEq/Kg. The defect will be carried over by the trader or 2nd manufacturer like us. The RM will be detoriated before 12 months but we can't reject it because it was within spec.

Thanks again for the info!

Regards

Sutan77

Charles.C IFSQN Moderator · Answer 6 · 2015-05-15T04:51:12+00:00

Thanks Charles!!! The codex document is really informative. I can use it as reference of acceptable PV after storage.

The spec from original manufacturer was not optimistic but more realistic from my perspective. If they put <10mEq/Kg as acceptable PV after manufacturer means no storage time allowed. If the shelflife of RM is 12 months and manufacturer would release RM with 9.88 mEq/Kg. The defect will be carried over by the trader or 2nd manufacturer like us. The RM will be detoriated before 12 months but we can't reject it because it was within spec.

Thanks again for the info!

Regards

Sutan77