Avoiding and reducing microplastic false positives from dry glove contact

There is growing evidence that there is much less to worry about on microplastics on several fronts.

1. A whole cohort of core studies have been judged to have invalid methodology due to not recording baseline microplastic levels (https://www.pnas.org/doi/10.1073/pnas.2411099121)

2. Young-onset cancers (especially colorectal cancer) which were inferred to be caused by a rise in microplastics are being linked explicitly to other mechanisms and cohorts. (https://ascopubs.org/doi/10.1200/JCO.2025.43.16_suppl.3619)

Summary: dry contact with nearly any laboratory glove will lead to sample contamination and over estimation of microplastics. They found one type of clean room gloves that contaminate less.

Is there any indication on how bad this really is?

Now, I'm worried about people preparing my food with gloves.

There is growing evidence that there is much less to worry about on microplastics on several fronts.

1. A whole cohort of core studies have been judged to have invalid methodology due to not recording baseline microplastic levels (https://www.pnas.org/doi/10.1073/pnas.2411099121)

"Exercise induced gastrointestinal injury"!

I think those papers mostly show that parts of the microplastics literature were overstated or methodologically weak, not that microplastics are harmless.

The PNAS paper is a pretty good critique of contamination/baseline issues, and I agree some of the “microplastics are causing young-onset cancer” claims got ahead of the evidence.

But the broader concern still exists: people are clearly exposed constantly, particles are being found in human tissue, and there are plausible mechanisms for harm. So no, there is not "much less to worry".

"Exercise induced gastrointestinal injury"!

Can't read the full study, but it seems to be specifically about people who run ultramarathons. Which sounds like a very small subset of the general population. I doubt that tiny cohort is in any way responsible for the overall increase in bowel cancer in younger people.

Summary: dry contact with nearly any laboratory glove will lead to sample contamination and over estimation of microplastics. They found one type of clean room gloves that contaminate less.

Is there any indication on how bad this really is?

Around 2000 to over 7000 false positives per mm^2 based on the type of glove. Essentially, regular lab gloves shed enough particles to swamp microplastic measurements to warrant switching to clean room gloves for this type of analysis.

Shouldn't any lab analysis have control samples to detect environment contamination like this?

Now, I'm worried about people preparing my food with gloves.

“Are you wearing gloves? That’s disgusting. Use your bare hands, you animal.”

I think those papers mostly show that parts of the microplastics literature were overstated or methodologically weak, not that microplastics are harmless.

The PNAS paper is a pretty good critique of contamination/baseline issues, and I agree some of the “microplastics are causing young-onset cancer” claims got ahead of the evidence.

I agree that there is not evidence to "not worry", but many explicit worries are being accounted for.

Also - in terms of human tissue:

"The problem is that some small molecules in the fumes derived from polyethylene and PVC can also be produced from fats in human tissue. Human samples are “digested” with chemicals to remove tissue before analysis, but if some remains the result can be false positives for MNPs. Rauert’s paper lists 18 studies that did not include consideration of the risk of such false positives." (https://www.theguardian.com/environment/2026/jan/13/micropla...)

and Rauert's paper (https://pubs.acs.org/doi/10.1021/acs.est.4c12599)

“Are you wearing gloves? That’s disgusting. Use your bare hands, you animal.”

"I only allow robots with stainless steel tools to prepare and serve my food."

I agree that there is not evidence to "not worry", but many explicit worries are being accounted for.

Also - in terms of human tissue:

and Rauert's paper (https://pubs.acs.org/doi/10.1021/acs.est.4c12599)

Shouldn't any lab analysis have control samples to detect environment contamination like this?

It's difficult to avoid contamination, since everything (samples, containers, equipements, etc) will have been in contact with glove at least once, and good decontamination is very hard.

Yes, exactly, that's why you use control samples to get the baseline.

Author affiliations

* Corresponding authors

a Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA
E-mail: ajmcneil@umich.edu

b Department of Statistics, University of Michigan, Ann Arbor, MI 48109-1107, USA

c Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, MI 48109-2102, USA

d Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109-2122, USA

e Program in the Environment, University of Michigan, Ann Arbor, MI 48109-1041, USA

Abstract

To attenuate microplastics pollution, we first must quantify the number and types of microplastics found in the natural environment and identify their sources. Quantifying environmental microplastics requires distinguishing synthetic polymers from other naturally occurring species. Quality assurance and control measures – including wearing gloves when handling laboratory materials and samples – seek to reduce overestimating microplastic abundance. However, commonly used laboratory gloves release non-volatile residues, including stearate salts, that exhibit vibrational spectra similar to microplastics. In this work, we illustrate that dry surface contact with nitrile and latex laboratory gloves can cause overestimations of microplastics (mean 2000 false positives per mm2) when using traditional library matching approaches. We recommend a nitrile cleanroom glove (mean 100 false positives per mm2) to reduce contamination. For existing contaminated infrared and Raman spectral datasets, we outline workflows that differentiate between microplastics and stearate contamination from gloves. Applying these workflows to a case study of glove-contaminated environmental data, we illustrate that the proposed solutions reduce MP false positives at the smallest size ranges (<10 µm). By using this approach in conjunction with our included spectral libraries of stearate standards, researchers can address glove-based contamination in environmental datasets and provide more accurate estimates of environmental microplastic abundance.

Graphical abstract: Avoiding and reducing microplastic false positives from dry glove contact

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DOI

https://doi.org/10.1039/D5AY01801C

Article type

Paper

Submitted

29 Oct 2025

Accepted

11 Mar 2026

First published

26 Mar 2026

This article is Open Access

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Anal. Methods, 2026,18, 2914-2926

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Avoiding and reducing microplastic false positives from dry glove contact

M. E. Clough, E. Ochoa Rivera, A. M. Ayala, R. L. Parham, J. Pennacchio, H. E. Thurber, A. P. Ault, A. Tewari and A. J. McNeil, Anal. Methods, 2026, 18, 2914 DOI: 10.1039/D5AY01801C

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