Rapid detection of fungal alpha-amylase in the work environment with a lateral flow immunoassay.
BACKGROUND
Occupational allergen exposure assessment usually requires airborne dust sampling at the worksite followed by dust extraction and enzyme immunoassay (EIA) analysis at the laboratory. Use of semiquantitative lateral flow immunoassays (LFIAs) may allow a more rapid detection procedure with direct on-site demonstration of a bioallergen exposure hazard.


OBJECTIVE
In a field study, we evaluated a recently developed LFIA for fungal alpha-amylase, an important bakery allergen.


METHODS
Airborne and surface dust (wipe) samples and samples from flours and baking additives used at the workplace were collected in 5 industrial bakeries and tested in the LFIA for fungal amylase. For comparison, amylase was measured in sample eluates with the reference EIA method.


RESULTS
Sensitivity of the LFIA was 1 to 10 ng/mL, and of EIA, approximately 25 pg/mL. In LFIA, most flour samples, 84% of wipe samples, 26% of personal airborne dust, and none of the 26 ambient air dust samples produced a visible reaction. Wipe samples from dough-making areas and flour samples gave the strongest reactions. All extracts with >5 ng allergen per milliliter showed a positive LFIA reaction.


CONCLUSIONS
The LFIA for fungal amylase is an easy and rapid method to demonstrate the allergen directly at the worksite in less than 10 to 20 minutes. Similar LFIA methods may be used for other occupational allergens in other work environments.


CONCLUSIONS
Lateral flow immunoassays for occupational allergens may be of great value in occupational hygiene surveys to demonstrate directly to workers and supervisors the hazards of work-related bioallergen exposure.
Bogdanovic
Jelena
J
Institute for Risk Assessment Sciences, Utrecht University, Utrecht, The Netherlands. j.bogdanovic@iras.uu.nl <j.bogdanovic@iras.uu.nl>
Koets
Marjo
M
Sander
Ingrid
I
Wouters
Inge
I
Meijster
Tim
T
Heederik
Dick
D
van Amerongen
Aart
A
Doekes
Gert
G
D000391:Air Microbiology; D000395:Air Pollutants, Occupational / Q000009:adverse effects / Q000032:analysis*; D000946:Antigens, Fungal / Q000009:adverse effects / Q000032:analysis / Q000276:immunology; D004391:Dust / Q000032:analysis; D005658:Fungi / Q000201:enzymology*; D007124:Immunoenzyme Techniques / Q000379:methods; D009784:Occupational Diseases / Q000201:enzymology* / Q000276:immunology / Q000382:microbiology*; D017132:Workplace; D000516:alpha-Amylases / Q000009:adverse effects / Q000032:analysis* / Q000276:immunology
D000395:Air Pollutants, Occupational; D000946:Antigens, Fungal; D004391:Dust; D000516:alpha-Amylases