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Optimal conditions for the removal of house dust mite, dog dander, and pollen allergens using mechanical laundry
Soo-Young Choi1, In-Yong Lee, Jung-Ho Sohn
1Institute of Allergy and Department of Internal Medicine, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.
Background:
Mechanical laundry is an effective tool for the environmental control of allergens, but the optimal conditions for removing allergens are not yet clear.
Objective:
To evaluate the optimal conditions of mechanical laundry for the removal of house dust mite (HDM), dog dander, and pollen allergens.
Methods:
The 4 washing modes of 30 degrees C (86 degrees F), 40 degrees C (104 degrees F), 60 degrees C (140 degrees F), and steam water (SW) with detergent were evaluated. Allergen removal performance was assayed using a 2-site enzyme-linked immunosorbent assay (ELISA) or an ELISA inhibition test.
Results:
Using the 30 degrees C and 40 degrees C washing modes, only 6.5% and 9.6% of Dermatophagoides farinae, respectively, were killed. However, using the 60 degrees C and SW washing modes, all HDMs were killed. The amounts of Der f 1 remaining after the 30 degrees C, 40 degrees C, 60 degrees C, and SW washing modes were 26.8%, 2.4%, 1.3%, and 0.6%, respectively, with unmanipulated contaminated sheets. The effects of rinse on Der f 1 levels after the 30 degrees C washing were greater compared with those after the 40 degrees C, 60 degrees C, and SW modes. The amounts of Can f 1 in the extractions after washing were 0.3% to 1.3% for all modes, and all extracts, even without a rinse, did not inhibit specific IgE binding to dog allergens according to ELISA. The remaining pollen allergen levels after washing were lower in the 60 degrees C and SW modes than in the lower temperature modes. However, the levels did not differ among the various washing modes after rinsing once.
Conclusion:
Water temperature and number of rinses are critical factors for the removal of HDM, dog dander, and pollen allergens.
Insights
Optimal laundry conditions effectively remove allergens like house dust mite (HDM) and dog dander. Higher temperatures (60°C or steam) and rinsing are crucial for allergen removal, especially for HDM.
Area of Science:
- Environmental Health
- Allergen Control
- Textile Science
Background:
- Mechanical laundry is a recognized method for controlling environmental allergens.
- Optimal washing conditions for allergen removal remain unclear.
Purpose of the Study:
- To determine the best mechanical laundry conditions for removing house dust mite (HDM), dog dander, and pollen allergens.
- Evaluate washing temperatures and rinsing effects on allergen reduction.
Main Methods:
- Washing tests were conducted using four modes: 30°C, 40°C, 60°C, and steam water (SW), all with detergent.
- Allergen levels were quantified using enzyme-linked immunosorbent assay (ELISA) or ELISA inhibition tests.
- The study assessed the removal of Dermatophagoides farinae (Der f 1), Can f 1, and pollen allergens.
Main Results:
- 60°C and SW washing modes eradicated all HDMs, while lower temperatures were less effective.
- Der f 1 levels were significantly reduced at higher temperatures, with 0.6% remaining after SW wash.
- Dog allergen (Can f 1) levels were consistently low across all modes, and pollen allergen removal improved with higher temperatures and rinsing.
Conclusions:
- Water temperature and the number of rinses are key factors in effectively removing HDM, dog dander, and pollen allergens.
- Higher washing temperatures (60°C or SW) are superior for eliminating HDMs.
- Rinsing significantly enhances allergen removal, particularly for Der f 1.
