Can you test for BPA? BPA testing methods, standards, kits and what a report shows

Can you test for BPA? Yes, in a lab

A lab can measure bisphenol A (BPA) in a plastic, a coating, water, a food or a finished product. The standard tools are liquid chromatography with tandem mass spectrometry (LC-MS/MS) and gas chromatography with mass spectrometry (GC-MS). The result is a number in µg/kg or µg/L, or “not detected” below a stated detection limit.

The detection limit matters as much as the method. EU rules now require the methods that check food contact materials for BPA to detect 1 µg/kg. The previous EU migration limit was 0.05 mg/kg, which is 50 µg/kg.

This guide covers products and materials; a BPA test on urine or blood is a medical test.

What BPA is and where it comes from

BPA (CAS 80-05-7) is a building block of polycarbonate plastics and epoxy resins. EFSA names polycarbonate water dispensers, food storage containers and reusable bottles, and epoxy linings for cans and vats. The EU has banned BPA in thermal paper receipts since January 2020, and its 2024 food contact ban also covers adhesives, rubbers, ion-exchange resins, printing inks and silicones.

A 2024 review in Archives of Toxicology explains that BPA leaves plastics and can coatings by hydrolysis of the polymer. Temperature, heating time, repeated use, the type of food and packaging, and pH all change how much migrates. The review also notes that, as rules tightened, makers moved to “BPA-free” alternatives. Several are other bisphenols, such as bisphenol S (BPS) and bisphenol F (BPF), so bisphenol testing increasingly means a panel.

BPA testing methods compared

In the 2024 review (European foods, 2018 to 2023), 67% of research groups used liquid chromatography, with mass spectrometry as the detector in 71% of those and fluorescence in 26%. One third used GC-MS.

Method	How it recognises BPA	What to know
LC-MS/MS	Mass of the ion and of one fragment; in one published method, m/z 227 to 212 in negative electrospray	Measures BPA and analogues in one run; an isotope-labelled standard such as BPA-d16 corrects for losses
GC-MS	Mass spectrum after derivatisation; silylated BPA gives an ion at m/z 357	Derivatisation, used in 59% of the GC studies reviewed, gives sharper peaks
HPLC with fluorescence	Retention time and fluorescence	Sensitive, but no mass confirmation
Immunoassay (ELISA, strips)	An antibody binds BPA	Also reads related bisphenols, in proportion to cross-reactivity

Mass spectrometry methods are targeted: they report only the bisphenols on their list, so a report that lists only BPA says nothing about BPS. Our guide to HPLC vs mass spec explains the detectors.

Why the blank decides a trace result

BPA is in the lab too. A 2016 paper in Analytical and Bioanalytical Chemistry found BPA in solvents, even LC-MS grade, in lab vessels and in plastic equipment. In a gradient method, BPA from the mobile phase built up on the column and showed as a peak even when nothing was injected; isocratic elution at 50% acetonitrile removed it. Ask to see the procedural blank next to your sample.

The BPA testing process, step by step

1. Define the question. Does the material contain BPA (content), or does BPA move into what it holds (migration)? The EU rule requires an extraction method to verify that a material contains no residual BPA.
2. Choose the analytes. BPA alone, or a panel with BPS, BPF and others.
3. Prepare the sample. For content, the lab extracts the material with a solvent. For migration, it exposes the article to a food simulant at a set time and temperature.
4. Clean up and measure. Often solid-phase extraction, then LC-MS/MS or GC-MS with an internal standard and blanks in the same run.
5. Report µg/kg or µg/L with the detection and quantitation limits.

BPA testing standards and limits

Rule or standard	Scope	Key numbers
Regulation (EU) 2024/3190	Bans BPA in food contact materials, with narrow exceptions	Verification methods must detect 1 µg/kg
Directive (EU) 2020/2184	Drinking water	BPA 2.5 µg/L; the method’s quantitation limit must be 0.75 µg/L (30% of the value) or lower
ASTM D7574-23	Surface water and treated effluent, by solid-phase extraction and LC-MS/MS	Not investigated for salt water or solids
ISO 18857-2:2009	Drinking, ground, surface and waste water, by GC-MS after derivatisation	Working range 0.05 to 0.2 µg/L; 0.1 to 50 µg/L in waste water

The regulation explains why: after EFSA’s 2023 opinion, no validated method could measure BPA migration reliably at a limit derived from the new tolerable intake, so the EU banned the use instead. For single-use articles made with BPA, the last day to be first placed on the EU market was 20 July 2026; a few exceptions run to 20 January 2028. The rule also covers other bisphenols with a harmonised hazard classification, BPS among them, and materials made with another bisphenol must contain no residual BPA.

FDA, on a page last updated in April 2023, still authorises BPA in polycarbonate and metal can coatings. It removed baby bottles and sippy cups in 2012, and infant formula packaging coatings in 2013, because industry had abandoned those uses. FDA states that such a change is not based on safety.

BPA test kits and test strips: what they can show

One validated BPA strip is a research test from BAM, Germany’s federal materials testing institute, published in Biosensors in 2021. Read by eye within 10 minutes, its cut-off was 10 µg/L; photo analysis lowered the detection limit to 0.14 µg/L. It agreed with ELISA and LC-MS/MS on thermal paper extracts, but missed one receipt extract at about 0.7 µg/L.

Its antibody reacted to bisphenol B (BPB) at 105% of BPA, and to BPS and BPF at less than 0.1%. In the same study, LC-MS/MS found BPS at about 270 to 780 µg/L in some thermal paper extracts. At that cross-reactivity, 780 µg/L of BPS reads as less than 1 µg/L of BPA. Three limits follow:

• Water. By eye, 10 µg/L is four times the EU drinking water value, so a clean strip does not show that water meets it.
• BPA-free claims. A strip cannot back a BPA-free claim for a product made with BPS or BPF.
• Positives. BPB reads as BPA, so a positive needs LC-MS/MS or GC-MS to name the bisphenol.

Before you trust any BPA test kit, ask for its cut-off in µg/L, its cross-reactivity table and a comparison with LC-MS/MS on your kind of sample. The same questions apply to peptide test kits.

How to read a BPA-free test report

Item	What to look for
Analytes	BPA and every analogue tested, by name
Test type	Content or migration; for migration, the simulant, time and temperature
Method	LC-MS/MS or GC-MS, with an isotope-labelled internal standard
Limits	Detection and quantitation limits per analyte, in the unit of the result
Result	µg/kg or µg/L, or less than the quantitation limit
Quality checks	A procedural blank and a spiked sample in the same batch
Limit source	Which rule or client set any pass limit

Two reports that both say “BPA not detected” can mean very different things. One may have a detection limit of 1 µg/kg; the other may only show migration below 50 µg/kg, the old EU limit.

Choosing a BPA testing lab, near you or abroad

Food contact, packaging and water labs run BPA tests. Two examples, from their own sites: Krause Analytical, a Texas contract lab that also tests peptides, lists BPA and BPS testing with confirmation by both GC-MS and LC-MS. Fraunhofer IVV in Germany lists LC-MS/MS for BPA, BPS and BPF in food simulants and materials, with detection limits around 0.1 µg/kg.

Samples travel by courier, so for “BPA testing near me” fit matters more than distance. Compare experience with your matrix, the analytes reported and the quantitation limit. If a regulator will read the result, look for an ISO/IEC 17025 scope that lists BPA in your matrix; our guide to ISO 17025 scopes shows how to read one.

BPA, peptides and their packaging

A research peptide has no official BPA limit; the food and water figures above are reference points only. The materials that touch a peptide are usually a glass vial and a rubber stopper and, for pens, the cartridge and plastic parts. Whether any of them was made with BPA is a question for the material’s supplier; a content or migration test checks one batch.

An identity, purity or content test does not look for BPA, because those methods target the peptide. A vial also holds only milligrams, and the less material goes into the extract, the higher the quantitation limit per kg. See extractables and leachables for what vials, stoppers and pens can add, and the guides on PFAS testing and how microplastics are detected.

What HK Analytical does today

HK Analytical is adding microplastic, PFAS and BPA testing. Write to contact@hkanalytical.com to hear when it starts.

Today we test research peptides: identity (LC-MS), purity (HPLC), content per vial, blind GLP-1 identification, endotoxin (LAL), Sterility (USP <71>, 14 days), residual solvents, counter-ion, water content and vial-to-vial consistency, in any mix per sample. Every number comes with its raw data, in a signed record you can check on /verify. We do not hold ISO/IEC 17025 accreditation. Request a quote for these tests, or use the contact page.