Bongkrekic acid: the one standard a food-poisoning investigation turns on
By CATO technical documentation · Published · Last reviewed · Food safety
Fermented rice noodles and similar wet starch products are a routine part of the diet in southern China and across Southeast Asia. They are also, when they are stored warm and damp, a substrate for Pseudomonas cocovenenans, which produces bongkrekic acid — a mitochondrial toxin with no antidote. Treatment is supportive, so the forensic question in an outbreak is almost always the same: how much was in the food?
That question is answered by LC-MS/MS, and the answer is only as good as the standard it is measured against.
Why this analyte punishes sloppy standards work
Bongkrekic acid is a quantitative determination, not a screening test. Two consequences follow.
- The assigned content matters more than the nominal purity. A certificate that says
"purity ≥ 98%" does not tell you what mass of bongkrekic acid is in the vial. Without an assigned content — a mass fraction with its analytical basis — a peak area cannot be converted into a concentration, and the number that reaches an outbreak report carries an unknown systematic error.
- It is a low-level measurement in a messy matrix. Wet starch, rice flour and fermented products
bring matrix effects that vary between sources. The standard has to be good enough that the uncertainty you report is dominated by your method, not by the reference material.
Neither of those is exotic. They are the ordinary requirements of any quantification, and they are the ones most often missing when a laboratory buys a cheap "standard" from a trading site with no certificate.
What to hold on file before a sample arrives
- A certified standard with an assigned content per lot, and the analytical basis of that
assignment (mass balance or qNMR) stated on the certificate.
- The lot you actually used, recorded against the run — because certificates are issued per lot,
and an investigation that has to be defended will be asked for it.
- A labelled internal standard if the method uses one, with the same content documentation.
- A safety data sheet that carries the transport classification: bongkrekic acid is acutely
toxic, and shipping and handling conditions follow from that.
What CATO supplies
CATO manufactures bongkrekic acid and related food-safety reference standards and issues a certificate of analysis for every lot, with the content assigned for that lot and the method stated. The product page carries the CAS number, formula, storage condition and available pack sizes; the lot certificate travels with the shipment and is retrievable by lot number.
If your laboratory is validating a method for this analyte — or you need a standard for a matrix CATO does not currently list — send the method reference and the matrix, and we will come back with availability, documentation and lead time. See the catalogue for the items already listed, or the custom synthesis page where the method needs something we do not hold.
*Background on the food-safety topic comes from CATO's own industry notes; the requirements above are the ones a laboratory can hold itself, and we do not publish prices — quotations are given per enquiry.*
Written by CATO. Where a claim depends on an external source we say which one; where it depends on our own catalogue we name the catalogue number so you can check it. Spotted an error? Email chao.lu@cato-chem.com — corrections are published in place.